TY  - CONF
AU  - Pergal, Marija
AU  - Rašljić-Rafajilović, Milena
AU  - Vićentić, Teodora
AU  - Mladenović, Ivana
AU  - Ostojić, Sanja
AU  - Spasenović, Marko
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6740
AB  - Laser-induced graphene (LIG) has recently been proposed as a viable option for fabricating
various types of flexible electronic devices due to its excellent mechanical stability and
electrical properties. During laser induction of graphene on polymers, the high temperature
generated with the laser breaks C-O, C=O, and N-C bonds in polymers, leading to the
recombination of C and N atoms. Additionally, the rapid release of carbonaceous and nitric gases results in the formation of 3D porous structures. This approach offers a one-step,
chemical-free synthesis method for producing porous graphene on polymer surfaces.
Moreover, it is a fast and cost-effective technique that is ideal for flexible electronics and
energy storage devices. In this study, graphene was formed on a poly(dimethylsiloxane)
(PDMS)/Triton substrate with varying concentrations of Triton (1-30 wt.%) using CO2 laser
irradiation. The effects of Triton content on the structural, thermal, and surface characteristics
of PDMS/Triton and PDMS/Triton/graphene materials were investigated. The prepared
PDMS/Triton/graphene materials were thoroughly examined using X-ray diffraction analysis
(XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and
water contact angle analysis. XRD analysis confirmed the presence of graphene in the
material. The thermal and surface properties of the proposed materials can be easily adjusted
by manipulating the Triton concentration. The hydrophilicity of the prepared PDMS/Triton
materials increased compared to pure PDMS, which is hydrophobic. It was found that the
success of LIG formation depends on Triton content, increasing with higher concentration of
Triton in the PDMS matrix. The presented results aim to address the existing challenges
associated with stretchable polymers suitable for flexible electronic device applications.
PB  - Serbian Ceramic Society
C3  - Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia
T1  - Structural and thermal properties of PDMS/Triton/laser-induced graphene composites
SP  - 59
EP  - 60
UR  - https://hdl.handle.net/21.15107/rcub_cer_6740
ER  - 

@conference{
author = "Pergal, Marija and Rašljić-Rafajilović, Milena and Vićentić, Teodora and Mladenović, Ivana and Ostojić, Sanja and Spasenović, Marko",
year = "2023",
abstract = "Laser-induced graphene (LIG) has recently been proposed as a viable option for fabricating
various types of flexible electronic devices due to its excellent mechanical stability and
electrical properties. During laser induction of graphene on polymers, the high temperature
generated with the laser breaks C-O, C=O, and N-C bonds in polymers, leading to the
recombination of C and N atoms. Additionally, the rapid release of carbonaceous and nitric gases results in the formation of 3D porous structures. This approach offers a one-step,
chemical-free synthesis method for producing porous graphene on polymer surfaces.
Moreover, it is a fast and cost-effective technique that is ideal for flexible electronics and
energy storage devices. In this study, graphene was formed on a poly(dimethylsiloxane)
(PDMS)/Triton substrate with varying concentrations of Triton (1-30 wt.%) using CO2 laser
irradiation. The effects of Triton content on the structural, thermal, and surface characteristics
of PDMS/Triton and PDMS/Triton/graphene materials were investigated. The prepared
PDMS/Triton/graphene materials were thoroughly examined using X-ray diffraction analysis
(XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and
water contact angle analysis. XRD analysis confirmed the presence of graphene in the
material. The thermal and surface properties of the proposed materials can be easily adjusted
by manipulating the Triton concentration. The hydrophilicity of the prepared PDMS/Triton
materials increased compared to pure PDMS, which is hydrophobic. It was found that the
success of LIG formation depends on Triton content, increasing with higher concentration of
Triton in the PDMS matrix. The presented results aim to address the existing challenges
associated with stretchable polymers suitable for flexible electronic device applications.",
publisher = "Serbian Ceramic Society",
journal = "Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia",
title = "Structural and thermal properties of PDMS/Triton/laser-induced graphene composites",
pages = "59-60",
url = "https://hdl.handle.net/21.15107/rcub_cer_6740"
}

Pergal, M., Rašljić-Rafajilović, M., Vićentić, T., Mladenović, I., Ostojić, S.,& Spasenović, M.. (2023). Structural and thermal properties of PDMS/Triton/laser-induced graphene composites. in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia
Serbian Ceramic Society., 59-60.
https://hdl.handle.net/21.15107/rcub_cer_6740

Pergal M, Rašljić-Rafajilović M, Vićentić T, Mladenović I, Ostojić S, Spasenović M. Structural and thermal properties of PDMS/Triton/laser-induced graphene composites. in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia. 2023;:59-60.
https://hdl.handle.net/21.15107/rcub_cer_6740 .

Pergal, Marija, Rašljić-Rafajilović, Milena, Vićentić, Teodora, Mladenović, Ivana, Ostojić, Sanja, Spasenović, Marko, "Structural and thermal properties of PDMS/Triton/laser-induced graphene composites" in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia (2023):59-60,
https://hdl.handle.net/21.15107/rcub_cer_6740 .

TY  - CONF
AU  - Pešić, Ivan
AU  - Rašljić-Rafajilović, Milena
AU  - Vasiljević-Radović, Dana
AU  - Ostojić, Sanja
AU  - Petrović, Miloš
AU  - Radojević, Vesna
AU  - Pergal, Marija
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6690
AB  - The present study reports on the preparation of nanocomposites consisting of polyurethane (PU) as the matrix and Ti 3 C 2 T x MXene as the nanofiller, utilizing an in-situ polymerization method. The synthesis parameters of polyurethane remained constant, while the method of adding and preparing MXene was varied. The MXene content was maintained at 1 wt.% for all prepared nanocomposites, and the soft segment content was held constant as well. For the characterization of our materials, FTIR, SEM, TGA and tensile tests were employed. Also, the properties of the prepared nanocomposites were compared to pure PU. FTIR spectra confirmed the formation of urethane bonds. SEM images demonstrated the dispersion state of MXene in the polymer matrix. TGA revealed higher thermal stability of the prepared nanocomposites compared to pure PU. Moreover, the Young’s modulus and tensile strength increased for all prepared nanocomposites.
PB  - Institute of Electrical and Electronics Engineers (IEEE)
C3  - 10th International Conference on Electrical, Electronic and Computing Engineering (IcETRAN), 05-08 June 2023, East Sarajevo, Bosnia and Herzegovina
T1  - Optimization of reaction parameters for preparation  of MXene-based polymer nanocomposites
SP  - 23488337
DO  - 10.1109/IcETRAN59631.2023.10192211
ER  - 

@conference{
author = "Pešić, Ivan and Rašljić-Rafajilović, Milena and Vasiljević-Radović, Dana and Ostojić, Sanja and Petrović, Miloš and Radojević, Vesna and Pergal, Marija",
year = "2023",
abstract = "The present study reports on the preparation of nanocomposites consisting of polyurethane (PU) as the matrix and Ti 3 C 2 T x MXene as the nanofiller, utilizing an in-situ polymerization method. The synthesis parameters of polyurethane remained constant, while the method of adding and preparing MXene was varied. The MXene content was maintained at 1 wt.% for all prepared nanocomposites, and the soft segment content was held constant as well. For the characterization of our materials, FTIR, SEM, TGA and tensile tests were employed. Also, the properties of the prepared nanocomposites were compared to pure PU. FTIR spectra confirmed the formation of urethane bonds. SEM images demonstrated the dispersion state of MXene in the polymer matrix. TGA revealed higher thermal stability of the prepared nanocomposites compared to pure PU. Moreover, the Young’s modulus and tensile strength increased for all prepared nanocomposites.",
publisher = "Institute of Electrical and Electronics Engineers (IEEE)",
journal = "10th International Conference on Electrical, Electronic and Computing Engineering (IcETRAN), 05-08 June 2023, East Sarajevo, Bosnia and Herzegovina",
title = "Optimization of reaction parameters for preparation  of MXene-based polymer nanocomposites",
pages = "23488337",
doi = "10.1109/IcETRAN59631.2023.10192211"
}

Pešić, I., Rašljić-Rafajilović, M., Vasiljević-Radović, D., Ostojić, S., Petrović, M., Radojević, V.,& Pergal, M.. (2023). Optimization of reaction parameters for preparation  of MXene-based polymer nanocomposites. in 10th International Conference on Electrical, Electronic and Computing Engineering (IcETRAN), 05-08 June 2023, East Sarajevo, Bosnia and Herzegovina
Institute of Electrical and Electronics Engineers (IEEE)., 23488337.
https://doi.org/10.1109/IcETRAN59631.2023.10192211

Pešić I, Rašljić-Rafajilović M, Vasiljević-Radović D, Ostojić S, Petrović M, Radojević V, Pergal M. Optimization of reaction parameters for preparation  of MXene-based polymer nanocomposites. in 10th International Conference on Electrical, Electronic and Computing Engineering (IcETRAN), 05-08 June 2023, East Sarajevo, Bosnia and Herzegovina. 2023;:23488337.
doi:10.1109/IcETRAN59631.2023.10192211 .

Pešić, Ivan, Rašljić-Rafajilović, Milena, Vasiljević-Radović, Dana, Ostojić, Sanja, Petrović, Miloš, Radojević, Vesna, Pergal, Marija, "Optimization of reaction parameters for preparation  of MXene-based polymer nanocomposites" in 10th International Conference on Electrical, Electronic and Computing Engineering (IcETRAN), 05-08 June 2023, East Sarajevo, Bosnia and Herzegovina (2023):23488337,
https://doi.org/10.1109/IcETRAN59631.2023.10192211 . .

TY  - CONF
AU  - Pergal, Marija
AU  - Rašljić Rafajilović, Milena
AU  - Vićentić, Teodora
AU  - Pašti, Igor
AU  - Bajuk-Bogdanović, Danica
AU  - Radulović, Katarina
AU  - Spasenović, Marko
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7114
AB  - Laser-induced graphene (LIG) has emerged as one of the most promising materials for
flexible functional devices. One-step fabrication of LIG offers advantages such as low cost,
patterning of desired geometries, and high sensitivity. However, previous attempts to obtain
LIG on elastomeric substrates have been unsuccessful, limiting its potential for use in
stretchable electronics. In this study, we propose using a substrate composed of
polydimethylsiloxane (PDMS) and poly(ethylene oxide) (PEO) with a low molecular weight
as a platform for manufacturing LIG. A series of PDMS/PEO materials with varying
concentrations of PEO (1, 5, 10, 20, 30, 40 and 50 wt.%) were prepared using a cast-based
approach, starting from divinyl-terminated-PDMS and poly(methyl-hydrogensiloxane). The
prepared PDMS/PEO/graphene composites were characterized using Raman spectroscopy,
Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM)
analysis. FTIR analysis confirmed the structure of the prepared PDMS/PEO and
PDMS/PEO/graphene materials. The results demonstrated that the prepared PDMS/PEO
composites exhibited a higher degree of graphenization compared to pure PDMS networks.
SEM analysis revealed the formation of a porous graphene structure. Based on these findings,
the PDMS/PEO/graphene composites show promise for further investigation as electronic
device applications.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia
T1  - Laser-induced graphene on PEO/PDMS composites
SP  - 59
EP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_cer_7114
ER  - 

@conference{
author = "Pergal, Marija and Rašljić Rafajilović, Milena and Vićentić, Teodora and Pašti, Igor and Bajuk-Bogdanović, Danica and Radulović, Katarina and Spasenović, Marko",
year = "2023",
abstract = "Laser-induced graphene (LIG) has emerged as one of the most promising materials for
flexible functional devices. One-step fabrication of LIG offers advantages such as low cost,
patterning of desired geometries, and high sensitivity. However, previous attempts to obtain
LIG on elastomeric substrates have been unsuccessful, limiting its potential for use in
stretchable electronics. In this study, we propose using a substrate composed of
polydimethylsiloxane (PDMS) and poly(ethylene oxide) (PEO) with a low molecular weight
as a platform for manufacturing LIG. A series of PDMS/PEO materials with varying
concentrations of PEO (1, 5, 10, 20, 30, 40 and 50 wt.%) were prepared using a cast-based
approach, starting from divinyl-terminated-PDMS and poly(methyl-hydrogensiloxane). The
prepared PDMS/PEO/graphene composites were characterized using Raman spectroscopy,
Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM)
analysis. FTIR analysis confirmed the structure of the prepared PDMS/PEO and
PDMS/PEO/graphene materials. The results demonstrated that the prepared PDMS/PEO
composites exhibited a higher degree of graphenization compared to pure PDMS networks.
SEM analysis revealed the formation of a porous graphene structure. Based on these findings,
the PDMS/PEO/graphene composites show promise for further investigation as electronic
device applications.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia",
title = "Laser-induced graphene on PEO/PDMS composites",
pages = "59-59",
url = "https://hdl.handle.net/21.15107/rcub_cer_7114"
}

Pergal, M., Rašljić Rafajilović, M., Vićentić, T., Pašti, I., Bajuk-Bogdanović, D., Radulović, K.,& Spasenović, M.. (2023). Laser-induced graphene on PEO/PDMS composites. in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia
Belgrade : Serbian Ceramic Society., 59-59.
https://hdl.handle.net/21.15107/rcub_cer_7114

Pergal M, Rašljić Rafajilović M, Vićentić T, Pašti I, Bajuk-Bogdanović D, Radulović K, Spasenović M. Laser-induced graphene on PEO/PDMS composites. in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia. 2023;:59-59.
https://hdl.handle.net/21.15107/rcub_cer_7114 .

Pergal, Marija, Rašljić Rafajilović, Milena, Vićentić, Teodora, Pašti, Igor, Bajuk-Bogdanović, Danica, Radulović, Katarina, Spasenović, Marko, "Laser-induced graphene on PEO/PDMS composites" in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia (2023):59-59,
https://hdl.handle.net/21.15107/rcub_cer_7114 .

TY  - CONF
AU  - Rašljić Rafajilović, Milena
AU  - Vićentić, Teodora
AU  - Spasenović, Marko
AU  - Bajuk-Bogdanović, Danica
AU  - Pašti, Igor
AU  - Radulović, Katarina
AU  - Pergal, Marija
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7115
AB  - The objective of this study was to develop optimal laser parameters (resolution, power, and velocity) for the formation of graphene on poly(dimethylsiloxane) (PDMS)-based materials using laser-induced graphene (LIG). A series of novel PDMS/poly(ethylene glycol) (PEG) materials with varying concentrations of PEG (30, 40, and 50 wt.%) was prepared through a blending approach. For comparison, pure PDMS was prepared using a casting method. To the best of our knowledge, the synthesis of PDMS/PEG materials and the direct laser graphenization (LIG) of PDMS/PEG materials have not been reported in the literature. Once the optimal laser parameters were established, the prepared PDMS/PEG/graphene composites were characterized using Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM). The results demonstrated that the addition of PEG led to an enhanced degree of graphenization compared to the pure PDMS sample, which did not induce graphene formation. Among the materials tested, the PDMS/PEG/graphene composite with 30 wt.% PEG in the PDMS matrix exhibited the optimal degree of graphenization. SEM analysis of the LIG on PDMS/PEG material revealed a porous network structure. With their improved properties, the developed PDMS/PEG/graphene composites hold promise as materials suitable for the production of flexible electronic devices.
PB  - Академија наука и умјетности Републике Српске / Academy of Sciences and Arts of the Republic of Srpska
C3  - XVI Mеђународни научни скуп Савремени материјали 2023, Програм рада и Књига апстраката, 7 - 8. септембар 2023. године, Бања Лука /XVI International Scientific Conference Contemporary Materials 2023, Programme and the Book Of Abstracts, September 7 - 8, 2023, Banja Luka
T1  - Optimal laser parameters for laser induction of graphene on poly(dimethylsiloxane)-based materials
SP  - 40
EP  - 40
UR  - https://hdl.handle.net/21.15107/rcub_cer_7115
ER  - 

@conference{
author = "Rašljić Rafajilović, Milena and Vićentić, Teodora and Spasenović, Marko and Bajuk-Bogdanović, Danica and Pašti, Igor and Radulović, Katarina and Pergal, Marija",
year = "2023",
abstract = "The objective of this study was to develop optimal laser parameters (resolution, power, and velocity) for the formation of graphene on poly(dimethylsiloxane) (PDMS)-based materials using laser-induced graphene (LIG). A series of novel PDMS/poly(ethylene glycol) (PEG) materials with varying concentrations of PEG (30, 40, and 50 wt.%) was prepared through a blending approach. For comparison, pure PDMS was prepared using a casting method. To the best of our knowledge, the synthesis of PDMS/PEG materials and the direct laser graphenization (LIG) of PDMS/PEG materials have not been reported in the literature. Once the optimal laser parameters were established, the prepared PDMS/PEG/graphene composites were characterized using Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM). The results demonstrated that the addition of PEG led to an enhanced degree of graphenization compared to the pure PDMS sample, which did not induce graphene formation. Among the materials tested, the PDMS/PEG/graphene composite with 30 wt.% PEG in the PDMS matrix exhibited the optimal degree of graphenization. SEM analysis of the LIG on PDMS/PEG material revealed a porous network structure. With their improved properties, the developed PDMS/PEG/graphene composites hold promise as materials suitable for the production of flexible electronic devices.",
publisher = "Академија наука и умјетности Републике Српске / Academy of Sciences and Arts of the Republic of Srpska",
journal = "XVI Mеђународни научни скуп Савремени материјали 2023, Програм рада и Књига апстраката, 7 - 8. септембар 2023. године, Бања Лука /XVI International Scientific Conference Contemporary Materials 2023, Programme and the Book Of Abstracts, September 7 - 8, 2023, Banja Luka",
title = "Optimal laser parameters for laser induction of graphene on poly(dimethylsiloxane)-based materials",
pages = "40-40",
url = "https://hdl.handle.net/21.15107/rcub_cer_7115"
}

Rašljić Rafajilović, M., Vićentić, T., Spasenović, M., Bajuk-Bogdanović, D., Pašti, I., Radulović, K.,& Pergal, M.. (2023). Optimal laser parameters for laser induction of graphene on poly(dimethylsiloxane)-based materials. in XVI Mеђународни научни скуп Савремени материјали 2023, Програм рада и Књига апстраката, 7 - 8. септембар 2023. године, Бања Лука /XVI International Scientific Conference Contemporary Materials 2023, Programme and the Book Of Abstracts, September 7 - 8, 2023, Banja Luka
Академија наука и умјетности Републике Српске / Academy of Sciences and Arts of the Republic of Srpska., 40-40.
https://hdl.handle.net/21.15107/rcub_cer_7115

Rašljić Rafajilović M, Vićentić T, Spasenović M, Bajuk-Bogdanović D, Pašti I, Radulović K, Pergal M. Optimal laser parameters for laser induction of graphene on poly(dimethylsiloxane)-based materials. in XVI Mеђународни научни скуп Савремени материјали 2023, Програм рада и Књига апстраката, 7 - 8. септембар 2023. године, Бања Лука /XVI International Scientific Conference Contemporary Materials 2023, Programme and the Book Of Abstracts, September 7 - 8, 2023, Banja Luka. 2023;:40-40.
https://hdl.handle.net/21.15107/rcub_cer_7115 .

Rašljić Rafajilović, Milena, Vićentić, Teodora, Spasenović, Marko, Bajuk-Bogdanović, Danica, Pašti, Igor, Radulović, Katarina, Pergal, Marija, "Optimal laser parameters for laser induction of graphene on poly(dimethylsiloxane)-based materials" in XVI Mеђународни научни скуп Савремени материјали 2023, Програм рада и Књига апстраката, 7 - 8. септембар 2023. године, Бања Лука /XVI International Scientific Conference Contemporary Materials 2023, Programme and the Book Of Abstracts, September 7 - 8, 2023, Banja Luka (2023):40-40,
https://hdl.handle.net/21.15107/rcub_cer_7115 .

TY  - CONF
AU  - Rašljić Rafajilović, Milena
AU  - Bošković, Marko
AU  - Sarajlić, Milija
AU  - Mladenović, Ivana
AU  - Pešić, Ivan
AU  - Vasiljević-Radović, Dana
AU  - Pergal, Marija
PY  - 2023
UR  - https://www.etran.rs/2023/E_PROCEEDINGS_ICETRAN_2023/IcETRAN23_RADOVI/MOI1.1.pdf
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6254
AB  - Interdigitated electrodes with integrated heaters
fabricated on a Si platform were investigated in this study. The
electrodes and heaters were made of gold, using standard
photolithography processes. The primary objective was to
analyze the maximum temperature achievable on the
microheater and characterize its temperature distribution. The
integrated heater achieved a maximum temperature of 420 °C
with an applied voltage of 16 V. The temperature distribution
was uniform across the entire surface of the heater, which was
located on the underside of the chip beneath the interdigitated
electrodes. At higher temperatures, the silver paste, utilized as
a bonding agent between the copper wires and heater,
underwent melting.
PB  - Society for Electronics, Telecommunications, Computers, Automatic Control and Nuclear Engineering
C3  - Proceedings, X International conference IcETRAN, 05 - 08.06.2023, East Sarajevo, B&H
T1  - Photolithography-based Fabrication of Interdigitated Electrodes with Integrated Gold Microheater: Temperature Distribution Study
SP  - MOI1.1-1
EP  - MOI1.1-4
UR  - https://hdl.handle.net/21.15107/rcub_cer_6254
ER  - 

@conference{
author = "Rašljić Rafajilović, Milena and Bošković, Marko and Sarajlić, Milija and Mladenović, Ivana and Pešić, Ivan and Vasiljević-Radović, Dana and Pergal, Marija",
year = "2023",
abstract = "Interdigitated electrodes with integrated heaters
fabricated on a Si platform were investigated in this study. The
electrodes and heaters were made of gold, using standard
photolithography processes. The primary objective was to
analyze the maximum temperature achievable on the
microheater and characterize its temperature distribution. The
integrated heater achieved a maximum temperature of 420 °C
with an applied voltage of 16 V. The temperature distribution
was uniform across the entire surface of the heater, which was
located on the underside of the chip beneath the interdigitated
electrodes. At higher temperatures, the silver paste, utilized as
a bonding agent between the copper wires and heater,
underwent melting.",
publisher = "Society for Electronics, Telecommunications, Computers, Automatic Control and Nuclear Engineering",
journal = "Proceedings, X International conference IcETRAN, 05 - 08.06.2023, East Sarajevo, B&H",
title = "Photolithography-based Fabrication of Interdigitated Electrodes with Integrated Gold Microheater: Temperature Distribution Study",
pages = "MOI1.1-1-MOI1.1-4",
url = "https://hdl.handle.net/21.15107/rcub_cer_6254"
}

Rašljić Rafajilović, M., Bošković, M., Sarajlić, M., Mladenović, I., Pešić, I., Vasiljević-Radović, D.,& Pergal, M.. (2023). Photolithography-based Fabrication of Interdigitated Electrodes with Integrated Gold Microheater: Temperature Distribution Study. in Proceedings, X International conference IcETRAN, 05 - 08.06.2023, East Sarajevo, B&H
Society for Electronics, Telecommunications, Computers, Automatic Control and Nuclear Engineering., MOI1.1-1-MOI1.1-4.
https://hdl.handle.net/21.15107/rcub_cer_6254

Rašljić Rafajilović M, Bošković M, Sarajlić M, Mladenović I, Pešić I, Vasiljević-Radović D, Pergal M. Photolithography-based Fabrication of Interdigitated Electrodes with Integrated Gold Microheater: Temperature Distribution Study. in Proceedings, X International conference IcETRAN, 05 - 08.06.2023, East Sarajevo, B&H. 2023;:MOI1.1-1-MOI1.1-4.
https://hdl.handle.net/21.15107/rcub_cer_6254 .

Rašljić Rafajilović, Milena, Bošković, Marko, Sarajlić, Milija, Mladenović, Ivana, Pešić, Ivan, Vasiljević-Radović, Dana, Pergal, Marija, "Photolithography-based Fabrication of Interdigitated Electrodes with Integrated Gold Microheater: Temperature Distribution Study" in Proceedings, X International conference IcETRAN, 05 - 08.06.2023, East Sarajevo, B&H (2023):MOI1.1-1-MOI1.1-4,
https://hdl.handle.net/21.15107/rcub_cer_6254 .

TY  - CONF
AU  - Pešić, Ivan
AU  - Ostojić, Sanja
AU  - Vasiljević-Radović, Dana
AU  - Petrović, Miloš
AU  - Radojević, Vesna
AU  - Pergal, Marija
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6943
AB  - MXenes are a relatively new class of 2D nanomaterials with promising properties. The 
functional groups on the surface of the nanosheets play a vital role in interacting with other 
materials, especially in nanocomposites. Biocompatibility, admirable mechanical properties, 
and thermal stability are the most significant properties of poly(dimethylsiloxane)-based 
polyurethanes (PU). They are highly convenient for applications in electronic devices and 
implants. In this study, the MXene content was 1 wt. % for two series and 0.5 wt. % for the 
other two series, while the soft segment content was 50 wt. % for all the series. The 
nanocomposites were obtained using an in-situ polymerization method. The timing of adding 
the MXene nanoparticles to the reaction mixture was also varied to examine the changes in 
the physico-mechanical properties of the nanocomposites. Differential scanning calorimetry 
(DSC), scanning electron microscopy (SEM), and tensile tests were conducted to analyze the 
properties of the resulting materials. The glass transition temperature is highest for the series 
in which MXenes are added in the first phase of polyaddition after the solvation of MDI, 
while the series with 0.5 wt.% MXene added later into the reaction exhibit two transitions. 
SEM images revealed uneven distribution and agglomeration of MXene nanoflakes when 
added into the siloxane prepolymer. The tensile test indicated that the series with 0.5 wt. % 
nanoflakes have significantly lower Young's modulus and tensile strength. The distribution of 
nanoparticles and surface morphology are strongly influenced by the timing of adding the 
MXene dispersion into the reaction mixture, as well as the nanoparticle content.
PB  - Serbian Ceramic Society
C3  - Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia
T1  - Impact of synthesis parameters on the properties of polymer/MXene  nanocomposites
SP  - 66
EP  - 66
UR  - https://hdl.handle.net/21.15107/rcub_cer_6943
ER  - 

@conference{
author = "Pešić, Ivan and Ostojić, Sanja and Vasiljević-Radović, Dana and Petrović, Miloš and Radojević, Vesna and Pergal, Marija",
year = "2023",
abstract = "MXenes are a relatively new class of 2D nanomaterials with promising properties. The 
functional groups on the surface of the nanosheets play a vital role in interacting with other 
materials, especially in nanocomposites. Biocompatibility, admirable mechanical properties, 
and thermal stability are the most significant properties of poly(dimethylsiloxane)-based 
polyurethanes (PU). They are highly convenient for applications in electronic devices and 
implants. In this study, the MXene content was 1 wt. % for two series and 0.5 wt. % for the 
other two series, while the soft segment content was 50 wt. % for all the series. The 
nanocomposites were obtained using an in-situ polymerization method. The timing of adding 
the MXene nanoparticles to the reaction mixture was also varied to examine the changes in 
the physico-mechanical properties of the nanocomposites. Differential scanning calorimetry 
(DSC), scanning electron microscopy (SEM), and tensile tests were conducted to analyze the 
properties of the resulting materials. The glass transition temperature is highest for the series 
in which MXenes are added in the first phase of polyaddition after the solvation of MDI, 
while the series with 0.5 wt.% MXene added later into the reaction exhibit two transitions. 
SEM images revealed uneven distribution and agglomeration of MXene nanoflakes when 
added into the siloxane prepolymer. The tensile test indicated that the series with 0.5 wt. % 
nanoflakes have significantly lower Young's modulus and tensile strength. The distribution of 
nanoparticles and surface morphology are strongly influenced by the timing of adding the 
MXene dispersion into the reaction mixture, as well as the nanoparticle content.",
publisher = "Serbian Ceramic Society",
journal = "Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia",
title = "Impact of synthesis parameters on the properties of polymer/MXene  nanocomposites",
pages = "66-66",
url = "https://hdl.handle.net/21.15107/rcub_cer_6943"
}

Pešić, I., Ostojić, S., Vasiljević-Radović, D., Petrović, M., Radojević, V.,& Pergal, M.. (2023). Impact of synthesis parameters on the properties of polymer/MXene  nanocomposites. in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia
Serbian Ceramic Society., 66-66.
https://hdl.handle.net/21.15107/rcub_cer_6943

Pešić I, Ostojić S, Vasiljević-Radović D, Petrović M, Radojević V, Pergal M. Impact of synthesis parameters on the properties of polymer/MXene  nanocomposites. in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia. 2023;:66-66.
https://hdl.handle.net/21.15107/rcub_cer_6943 .

Pešić, Ivan, Ostojić, Sanja, Vasiljević-Radović, Dana, Petrović, Miloš, Radojević, Vesna, Pergal, Marija, "Impact of synthesis parameters on the properties of polymer/MXene  nanocomposites" in Program and book of abstracts - Serbian Ceramics Society Conference - Advanced Ceramics and Application XI, New Frontiers in Multifunctional Material Science and Processing,18-20 th September 2023. Belgrade, Serbia (2023):66-66,
https://hdl.handle.net/21.15107/rcub_cer_6943 .

Mladenović, I., Vorkapić, M., Pergal, M., Ivanov, T., Baltić, M., Obradov, M.,& Vasiljević-Radović, D.. (2023). Primena metodologije odzivnih površina (RSM) u cilju optimizacije eksperimentalnih parametara 3D-štampe i postizanja boljih mehaničkih performansi štampanih elemenata. 
University of Belgrade - Institute of Chemistry, Technology and Metallurgy..
https://hdl.handle.net/21.15107/rcub_cer_6931

Mladenović I, Vorkapić M, Pergal M, Ivanov T, Baltić M, Obradov M, Vasiljević-Radović D. Primena metodologije odzivnih površina (RSM) u cilju optimizacije eksperimentalnih parametara 3D-štampe i postizanja boljih mehaničkih performansi štampanih elemenata. 2023;.
https://hdl.handle.net/21.15107/rcub_cer_6931 .

Mladenović, Ivana, Vorkapić, Miloš, Pergal, Marija, Ivanov, Toni, Baltić, Marija, Obradov, Marko, Vasiljević-Radović, Dana, "Primena metodologije odzivnih površina (RSM) u cilju optimizacije eksperimentalnih parametara 3D-štampe i postizanja boljih mehaničkih performansi štampanih elemenata" (2023),
https://hdl.handle.net/21.15107/rcub_cer_6931 .

TY  - CHAP
AU  - Pergal, Marija
AU  - Jakšić, Olga
AU  - Rašljić Rafajilović, Milena
AU  - Vasiljević-Radović, Dana
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6870
AB  - Polymer-based microelectromechanical systems (MEMS) and devices
are a rapidly expanding field with a wide range of applications, from
microfluidics including lab-on-a-chip systems, to new sensors and
actuators, to flexible and stretchable devices. The use of microfluidic
devices and, more broadly, MEMS structures based on polymer
materials, has increased tremendously due to their great potential in
biomedical, point-of-care, and general healthcare applications.
Currently, polymer materials (elastomers, thermoplastics, and
thermosetting polymers) are commonly used in the fabrication of
microfluidic devices and MEMS structures for their low cost, versatile
fabrication methods, biocompatibility, repeatability, and a wide range of
(customizable) material characteristics with improved functionality.
Polymers have become one of the favored functional materials for microfluidic devices, as they possess excellent mechanical and optical
properties. Furthermore, a variety of polymeric materials with unique
physical and chemical characteristics are also available. Compared to
silicon and glass, polymers are inexpensive, feature a wide variety of
material properties for meeting various application requirements of
disposable biomedical microfluidic devices and MEMS structures, and
have a wide variety of practical applications. In this chapter, different
types of polymer materials used in microfluidics and MEMS devices, the
properties of polymer materials, and the methods for fabricating
polymer-based microfluidic systems and MEMS structures are
described. This chapter highlights the most recent developments, future
trends, and challenges in the devices’ preparation methods, and
applications of polymer-based microfluidic and MEMS devices
generally. Special care has been dedicated to biosensing and applications
where polymer-based microfluidic and MEMS devices allow for new
functionalities: applications based on the use of flexible and stretchable
electronic devices, applications employing novel functional materials
(such as biomimetic scaffold tissues), and advanced sensing mechanisms
(as in plasmonic biosensing). Moreover, this chapter focuses on the
synthesis of polymeric and inorganic nanoparticles in microreactors. The
advantages and limitations of using polymer materials in MEMS
technology are also discussed.
PB  - Nova Science
T2  - Advances in Materials Science Research
T1  - Polymer-Based Microelectromechanical Systems (MEMS) and Microfluidic Devices: Engineering and Applications
VL  - 63
SP  - 1
EP  - 117
UR  - https://hdl.handle.net/21.15107/rcub_cer_6870
ER  - 

@inbook{
author = "Pergal, Marija and Jakšić, Olga and Rašljić Rafajilović, Milena and Vasiljević-Radović, Dana",
year = "2023",
abstract = "Polymer-based microelectromechanical systems (MEMS) and devices
are a rapidly expanding field with a wide range of applications, from
microfluidics including lab-on-a-chip systems, to new sensors and
actuators, to flexible and stretchable devices. The use of microfluidic
devices and, more broadly, MEMS structures based on polymer
materials, has increased tremendously due to their great potential in
biomedical, point-of-care, and general healthcare applications.
Currently, polymer materials (elastomers, thermoplastics, and
thermosetting polymers) are commonly used in the fabrication of
microfluidic devices and MEMS structures for their low cost, versatile
fabrication methods, biocompatibility, repeatability, and a wide range of
(customizable) material characteristics with improved functionality.
Polymers have become one of the favored functional materials for microfluidic devices, as they possess excellent mechanical and optical
properties. Furthermore, a variety of polymeric materials with unique
physical and chemical characteristics are also available. Compared to
silicon and glass, polymers are inexpensive, feature a wide variety of
material properties for meeting various application requirements of
disposable biomedical microfluidic devices and MEMS structures, and
have a wide variety of practical applications. In this chapter, different
types of polymer materials used in microfluidics and MEMS devices, the
properties of polymer materials, and the methods for fabricating
polymer-based microfluidic systems and MEMS structures are
described. This chapter highlights the most recent developments, future
trends, and challenges in the devices’ preparation methods, and
applications of polymer-based microfluidic and MEMS devices
generally. Special care has been dedicated to biosensing and applications
where polymer-based microfluidic and MEMS devices allow for new
functionalities: applications based on the use of flexible and stretchable
electronic devices, applications employing novel functional materials
(such as biomimetic scaffold tissues), and advanced sensing mechanisms
(as in plasmonic biosensing). Moreover, this chapter focuses on the
synthesis of polymeric and inorganic nanoparticles in microreactors. The
advantages and limitations of using polymer materials in MEMS
technology are also discussed.",
publisher = "Nova Science",
journal = "Advances in Materials Science Research",
booktitle = "Polymer-Based Microelectromechanical Systems (MEMS) and Microfluidic Devices: Engineering and Applications",
volume = "63",
pages = "1-117",
url = "https://hdl.handle.net/21.15107/rcub_cer_6870"
}

Pergal, M., Jakšić, O., Rašljić Rafajilović, M.,& Vasiljević-Radović, D.. (2023). Polymer-Based Microelectromechanical Systems (MEMS) and Microfluidic Devices: Engineering and Applications. in Advances in Materials Science Research
Nova Science., 63, 1-117.
https://hdl.handle.net/21.15107/rcub_cer_6870

Pergal M, Jakšić O, Rašljić Rafajilović M, Vasiljević-Radović D. Polymer-Based Microelectromechanical Systems (MEMS) and Microfluidic Devices: Engineering and Applications. in Advances in Materials Science Research. 2023;63:1-117.
https://hdl.handle.net/21.15107/rcub_cer_6870 .

Pergal, Marija, Jakšić, Olga, Rašljić Rafajilović, Milena, Vasiljević-Radović, Dana, "Polymer-Based Microelectromechanical Systems (MEMS) and Microfluidic Devices: Engineering and Applications" in Advances in Materials Science Research, 63 (2023):1-117,
https://hdl.handle.net/21.15107/rcub_cer_6870 .

TY  - CONF
AU  - Pešić, Ivan
AU  - Ostojić, Sanja
AU  - Vasiljević-Radović, Dana
AU  - Petrović, Miloš
AU  - Radojević, Vesna
AU  - Pergal, Marija
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6944
AB  - MXenes are a relatively new class of 2D nanomaterials with promising properties. The functional groups on the surface of the nanosheets play a vital role in interacting with other materials, especially in nanocomposites. Biocompatibility, admirable mechanical properties, and thermal stability are the most significant properties of poly(dimethylsiloxane)-based polyurethanes (PU). They are highly convenient for applications in electronic devices and implants. In this study, the MXene content was 1 wt. % for two series and 0.5 wt. % for the other two series, while the soft segment content was 50 wt. % for all the series. The nanocomposites were obtained using an in-situ polymerization method. The timing of adding the MXene nanoparticles to the reaction mixture was also varied to examine the changes in the physico-mechanical properties of the nanocomposites. Differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and tensile tests were conducted to analyze the properties of the resulting materials. The glass transition temperature is highest for the series in which MXenes are added in the first phase of polyaddition after the solvation of MDI, while the series with 0.5 wt.% MXene added later into the reaction exhibit two transitions. SEM images revealed uneven distribution and agglomeration of MXene nanoflakes when added into the siloxane prepolymer. The tensile test indicated that the series with 0.5 wt. % nanoflakes have significantly lower Young's modulus and tensile strength. The distribution of nanoparticles and surface morphology are strongly influenced by the timing of adding the MXene dispersion into the reaction mixture, as well as the nanoparticle content.
T1  - Poster: "Impact of synthesis parameters on the properties of polymer/MXene  nanocomposites"
UR  - https://hdl.handle.net/21.15107/rcub_cer_6944
ER  - 

@conference{
author = "Pešić, Ivan and Ostojić, Sanja and Vasiljević-Radović, Dana and Petrović, Miloš and Radojević, Vesna and Pergal, Marija",
year = "2023",
abstract = "MXenes are a relatively new class of 2D nanomaterials with promising properties. The functional groups on the surface of the nanosheets play a vital role in interacting with other materials, especially in nanocomposites. Biocompatibility, admirable mechanical properties, and thermal stability are the most significant properties of poly(dimethylsiloxane)-based polyurethanes (PU). They are highly convenient for applications in electronic devices and implants. In this study, the MXene content was 1 wt. % for two series and 0.5 wt. % for the other two series, while the soft segment content was 50 wt. % for all the series. The nanocomposites were obtained using an in-situ polymerization method. The timing of adding the MXene nanoparticles to the reaction mixture was also varied to examine the changes in the physico-mechanical properties of the nanocomposites. Differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and tensile tests were conducted to analyze the properties of the resulting materials. The glass transition temperature is highest for the series in which MXenes are added in the first phase of polyaddition after the solvation of MDI, while the series with 0.5 wt.% MXene added later into the reaction exhibit two transitions. SEM images revealed uneven distribution and agglomeration of MXene nanoflakes when added into the siloxane prepolymer. The tensile test indicated that the series with 0.5 wt. % nanoflakes have significantly lower Young's modulus and tensile strength. The distribution of nanoparticles and surface morphology are strongly influenced by the timing of adding the MXene dispersion into the reaction mixture, as well as the nanoparticle content.",
title = "Poster: "Impact of synthesis parameters on the properties of polymer/MXene  nanocomposites"",
url = "https://hdl.handle.net/21.15107/rcub_cer_6944"
}

Pešić, I., Ostojić, S., Vasiljević-Radović, D., Petrović, M., Radojević, V.,& Pergal, M.. (2023). Poster: "Impact of synthesis parameters on the properties of polymer/MXene  nanocomposites". .
https://hdl.handle.net/21.15107/rcub_cer_6944

Pešić I, Ostojić S, Vasiljević-Radović D, Petrović M, Radojević V, Pergal M. Poster: "Impact of synthesis parameters on the properties of polymer/MXene  nanocomposites". 2023;.
https://hdl.handle.net/21.15107/rcub_cer_6944 .

Pešić, Ivan, Ostojić, Sanja, Vasiljević-Radović, Dana, Petrović, Miloš, Radojević, Vesna, Pergal, Marija, "Poster: "Impact of synthesis parameters on the properties of polymer/MXene  nanocomposites"" (2023),
https://hdl.handle.net/21.15107/rcub_cer_6944 .

TY  - CONF
AU  - Pergal, Marija
AU  - Brkljačić, Jelena
AU  - Vasiljević-Radović, Dana
AU  - Pergal, Miodrag
AU  - Pešić, Ivan
AU  - Dević, Gordana
AU  - Tovilović-Kovačević, Gordana
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7359
AB  - Polyurethane (PU) nanocomposite materials, offer very desirable advantages over pure PU materials,as the nanocomposites have enhanced thermal, surface, mechanical and biological properties. The main goal of this study was to develop a new kind of novel nanocomposites consisting of crosslinked PUs (based on poly(dimetylsiloxane) and hyperbranched polyester) and ferrite nanoparticles (based on copper and zinc) for possible application as coatings on biomedical devices and implants. A series of PU/ferrite nanocomposites was prepared by in situ polymerization in solution. Characterization of prepared nanocomposites nanocomposites was conducted by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). Copper and zinc releases were investigated by microwave plasma atomic emission spectrometry (MP-AES). Characteristics of the prepared nanocomposites when in contact with a biological environment were examined through testing their biocompatibility, and adhesion of fibroblast cells. The presence of the nanoferrite nanoparticles influenced on surface and biological properties of PU nanocomposites. The prepared PU nanocomposites with noncytotoxic chemistry could be used as promising materials for vascular implants development.
PB  - Belgrade: Serbian Ceramic Society
C3  - Program and the Book of Abstracts: Serbian Ceramic Society Conference Advanced Ceramics and Application 11: New Frontiers in Multifunctional Material Science and Processing; 2023 Sep 18-20; Belgrade, Serbia
T1  - Characterization of polyurethane/ferrite nanocomposites
SP  - 65
EP  - 65
UR  - https://hdl.handle.net/21.15107/rcub_cer_7359
ER  - 

@conference{
author = "Pergal, Marija and Brkljačić, Jelena and Vasiljević-Radović, Dana and Pergal, Miodrag and Pešić, Ivan and Dević, Gordana and Tovilović-Kovačević, Gordana",
year = "2023",
abstract = "Polyurethane (PU) nanocomposite materials, offer very desirable advantages over pure PU materials,as the nanocomposites have enhanced thermal, surface, mechanical and biological properties. The main goal of this study was to develop a new kind of novel nanocomposites consisting of crosslinked PUs (based on poly(dimetylsiloxane) and hyperbranched polyester) and ferrite nanoparticles (based on copper and zinc) for possible application as coatings on biomedical devices and implants. A series of PU/ferrite nanocomposites was prepared by in situ polymerization in solution. Characterization of prepared nanocomposites nanocomposites was conducted by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). Copper and zinc releases were investigated by microwave plasma atomic emission spectrometry (MP-AES). Characteristics of the prepared nanocomposites when in contact with a biological environment were examined through testing their biocompatibility, and adhesion of fibroblast cells. The presence of the nanoferrite nanoparticles influenced on surface and biological properties of PU nanocomposites. The prepared PU nanocomposites with noncytotoxic chemistry could be used as promising materials for vascular implants development.",
publisher = "Belgrade: Serbian Ceramic Society",
journal = "Program and the Book of Abstracts: Serbian Ceramic Society Conference Advanced Ceramics and Application 11: New Frontiers in Multifunctional Material Science and Processing; 2023 Sep 18-20; Belgrade, Serbia",
title = "Characterization of polyurethane/ferrite nanocomposites",
pages = "65-65",
url = "https://hdl.handle.net/21.15107/rcub_cer_7359"
}

Pergal, M., Brkljačić, J., Vasiljević-Radović, D., Pergal, M., Pešić, I., Dević, G.,& Tovilović-Kovačević, G.. (2023). Characterization of polyurethane/ferrite nanocomposites. in Program and the Book of Abstracts: Serbian Ceramic Society Conference Advanced Ceramics and Application 11: New Frontiers in Multifunctional Material Science and Processing; 2023 Sep 18-20; Belgrade, Serbia
Belgrade: Serbian Ceramic Society., 65-65.
https://hdl.handle.net/21.15107/rcub_cer_7359

Pergal M, Brkljačić J, Vasiljević-Radović D, Pergal M, Pešić I, Dević G, Tovilović-Kovačević G. Characterization of polyurethane/ferrite nanocomposites. in Program and the Book of Abstracts: Serbian Ceramic Society Conference Advanced Ceramics and Application 11: New Frontiers in Multifunctional Material Science and Processing; 2023 Sep 18-20; Belgrade, Serbia. 2023;:65-65.
https://hdl.handle.net/21.15107/rcub_cer_7359 .

Pergal, Marija, Brkljačić, Jelena, Vasiljević-Radović, Dana, Pergal, Miodrag, Pešić, Ivan, Dević, Gordana, Tovilović-Kovačević, Gordana, "Characterization of polyurethane/ferrite nanocomposites" in Program and the Book of Abstracts: Serbian Ceramic Society Conference Advanced Ceramics and Application 11: New Frontiers in Multifunctional Material Science and Processing; 2023 Sep 18-20; Belgrade, Serbia (2023):65-65,
https://hdl.handle.net/21.15107/rcub_cer_7359 .

TY  - CONF
AU  - Obradov, Marko
AU  - Jakšić, Zoran
AU  - Mladenović, Ivana
AU  - Pešić, Ivan
AU  - Pergal, Marija
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6779
AB  - Nanocomposites are among the most prominent subjects of material science and enable an enormous number of applications in diverse areas. They are of immense importance for micro and nanoelectronics, sensorics and photonics. They allow one to embed, tailor and program not only the fundamental material properties (a typical example being different metamaterials with traits usually not met in nature) but also to impart multifunctionalities to them. Here we consider a plasmonic metamaterial nanocomposite built of MXene strips suspended in a dielectric host. We numerically analyzed the influence of nanostrip orientation and ordering on the metamaterial properties. We utilized finite element method (FEM) for our electromagnetic simulations. We enhanced our stochastic nanocomposite metamaterial structure by adding a conductive backplate to further increase its optical absorption. The proposed multifunctional MXene-based metametamaterials can be used as a basis for refractometric sensors of any physical quantity that can modify nanostrips orientation, including mechanical sensing. Combining traditional and novel plasmonic approach to optical absorbers structure allows for a relatively simple “bottom up” approach to broadband optical superabsorber design.
PB  - Electron Devices Society of the IInstitute of electrical and electronics engineers, inc.
C3  - Proceedings - 33rd International Conference on Microelectronics, MIEL 2023 IEEE, October 16th -18th, 2023, Niš, Serbia
T1  - MXene Nanostrip Plasmonic Metamaterials for Mechanical Sensing and Enhanced Optical Absorption
SP  - 233
EP  - 236
UR  - https://hdl.handle.net/21.15107/rcub_cer_6779
ER  - 

@conference{
author = "Obradov, Marko and Jakšić, Zoran and Mladenović, Ivana and Pešić, Ivan and Pergal, Marija",
year = "2023",
abstract = "Nanocomposites are among the most prominent subjects of material science and enable an enormous number of applications in diverse areas. They are of immense importance for micro and nanoelectronics, sensorics and photonics. They allow one to embed, tailor and program not only the fundamental material properties (a typical example being different metamaterials with traits usually not met in nature) but also to impart multifunctionalities to them. Here we consider a plasmonic metamaterial nanocomposite built of MXene strips suspended in a dielectric host. We numerically analyzed the influence of nanostrip orientation and ordering on the metamaterial properties. We utilized finite element method (FEM) for our electromagnetic simulations. We enhanced our stochastic nanocomposite metamaterial structure by adding a conductive backplate to further increase its optical absorption. The proposed multifunctional MXene-based metametamaterials can be used as a basis for refractometric sensors of any physical quantity that can modify nanostrips orientation, including mechanical sensing. Combining traditional and novel plasmonic approach to optical absorbers structure allows for a relatively simple “bottom up” approach to broadband optical superabsorber design.",
publisher = "Electron Devices Society of the IInstitute of electrical and electronics engineers, inc.",
journal = "Proceedings - 33rd International Conference on Microelectronics, MIEL 2023 IEEE, October 16th -18th, 2023, Niš, Serbia",
title = "MXene Nanostrip Plasmonic Metamaterials for Mechanical Sensing and Enhanced Optical Absorption",
pages = "233-236",
url = "https://hdl.handle.net/21.15107/rcub_cer_6779"
}

Obradov, M., Jakšić, Z., Mladenović, I., Pešić, I.,& Pergal, M.. (2023). MXene Nanostrip Plasmonic Metamaterials for Mechanical Sensing and Enhanced Optical Absorption. in Proceedings - 33rd International Conference on Microelectronics, MIEL 2023 IEEE, October 16th -18th, 2023, Niš, Serbia
Electron Devices Society of the IInstitute of electrical and electronics engineers, inc.., 233-236.
https://hdl.handle.net/21.15107/rcub_cer_6779

Obradov M, Jakšić Z, Mladenović I, Pešić I, Pergal M. MXene Nanostrip Plasmonic Metamaterials for Mechanical Sensing and Enhanced Optical Absorption. in Proceedings - 33rd International Conference on Microelectronics, MIEL 2023 IEEE, October 16th -18th, 2023, Niš, Serbia. 2023;:233-236.
https://hdl.handle.net/21.15107/rcub_cer_6779 .

Obradov, Marko, Jakšić, Zoran, Mladenović, Ivana, Pešić, Ivan, Pergal, Marija, "MXene Nanostrip Plasmonic Metamaterials for Mechanical Sensing and Enhanced Optical Absorption" in Proceedings - 33rd International Conference on Microelectronics, MIEL 2023 IEEE, October 16th -18th, 2023, Niš, Serbia (2023):233-236,
https://hdl.handle.net/21.15107/rcub_cer_6779 .

TY  - JOUR
AU  - Dević, Gordana
AU  - Pergal, Marija
AU  - Pergal, Miodrag
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7209
AB  - In the present study, statistical correlation analysis and multivariate statistical techniques (PCA/FA) were employed to investigate polycyclic aromatic hydrocarbons (PAHs) in sediments, such as illite-montmorillonite (IM) and calcite (Ct), from two sedimentary environments of the Tertiary Krepoljin brown coal basin in Serbia. The coal and sediment layers were formed in fresh-water bogs during the Lower Miocene period. The total amount of extractable PAHs was determined by gas chromatography with a triple quad mass detector (GC-MS-MS), and it ranged from 449 to 10585 μg l−1 in all sediments. Eight of the total 16 PAHs, which ranged from 175.17 to 658.42 μg l−1, include benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, dibenzo[a,h]anthracene, benzo[g,h,i]perylene, and indeno[1,2,3-cd]pyrene, which are regarded as potentially carcinogenic, indicating a higher possibility of adverse ecological effects. Medium molecular-weight (MMW) PAHs were found to be predominant in all sediments. PAH concentrations are affected by several factors, such as carbon content, H/C mole ratio, and (less significant) O/C mole ratio. The non-existence of a correlation between the N/C ratio and other parameters indicates unspecific changes which accompany the original organic matter. The lower-sulfur Ct sediment samples were found to have a higher PAH content than higher sulfur IM samples, leading to the conclusion that the PAH content of sediments may be related to the depositional environment.
AB  - Во оваа студија се применети статистичка корелациона анализа и мултиваријантни  статистички техники (PCA/FA) за да се истражат полицикличните ароматични јаглеводороди  (PAHs), како што се илит-монтморилонит (IM) и калцит (Ct) во седименти, од две седиментни  средини на терцијарниот креполински базен на лигнит во Србија. Јагленот и седиментните слоеви  се формирани во слатководни мочуришта за време на периодот на долен миоцен. Вкупното  количество на PAHs што можат да се екстрахираат беше одредено со гасна хроматографија со  масен детектор со трократен квадрупол (GC-MS-MS) и беа во опсегот од 449 до 10585 μg l−1 во  сите седименти. Осум од вкупно 16 PAHs рангирани од 175,17 до 658,42 μg l−1 содржат бензо[a]антрацен, хризен, бензо[b]флуорантен, бензо[k]флуорантен, бензо[a]пирен, дибензо[a,h] антрацен, бензо[g,h,i]перилен и индено[1,2,3-cd]пирен; Сите тие се сметаат за потенцијално  канцерогени, укажувајќи на поголема веројатност за настанување несакани еколошки ефекти.  Беше утврдено дека во сите седименти преовладуваат PAHs со средни молекулски тежини  (MMW). Концентрациите на PAHs зависат од повеќе фактори, како што се содржината на  јаглерод, молскиот однос на Н/С и (помалку значајно) молскиот однос на О/С. Непостоењето на  корелација меѓу односот на N/C и други параметри укажува на неспецифични промени што ја придружуваат оригиналната органска материја. Беше утврдено дека седиментните примероци на  калцит со помала содржина на сулфур имаат поголема содржина на PAHs од примероците на IM со повисока содржина на сулфур што наведува на заклучок дека содржината на PAHs во  седиментите може да е поврзана со опкружувањето при таложењето.
PB  - Society of Chemists and Technologists of Macedonia
T2  - Macedonian Journal of Chemistry and Chemical Engineering
T1  - Polycyclic aromatic hydrocarbons in two sedimentary environments of the Tertiary Krepoljin coal basin
T1  - Полициклични ароматични јаглеводороди во две седиментни средини на креполинскиот терцијарен јагленов базен
VL  - 42
IS  - 1
SP  - 25
EP  - 36
DO  - 10.20450/mjcce.2023.2552
ER  - 

@article{
author = "Dević, Gordana and Pergal, Marija and Pergal, Miodrag",
year = "2023",
abstract = "In the present study, statistical correlation analysis and multivariate statistical techniques (PCA/FA) were employed to investigate polycyclic aromatic hydrocarbons (PAHs) in sediments, such as illite-montmorillonite (IM) and calcite (Ct), from two sedimentary environments of the Tertiary Krepoljin brown coal basin in Serbia. The coal and sediment layers were formed in fresh-water bogs during the Lower Miocene period. The total amount of extractable PAHs was determined by gas chromatography with a triple quad mass detector (GC-MS-MS), and it ranged from 449 to 10585 μg l−1 in all sediments. Eight of the total 16 PAHs, which ranged from 175.17 to 658.42 μg l−1, include benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, dibenzo[a,h]anthracene, benzo[g,h,i]perylene, and indeno[1,2,3-cd]pyrene, which are regarded as potentially carcinogenic, indicating a higher possibility of adverse ecological effects. Medium molecular-weight (MMW) PAHs were found to be predominant in all sediments. PAH concentrations are affected by several factors, such as carbon content, H/C mole ratio, and (less significant) O/C mole ratio. The non-existence of a correlation between the N/C ratio and other parameters indicates unspecific changes which accompany the original organic matter. The lower-sulfur Ct sediment samples were found to have a higher PAH content than higher sulfur IM samples, leading to the conclusion that the PAH content of sediments may be related to the depositional environment., Во оваа студија се применети статистичка корелациона анализа и мултиваријантни  статистички техники (PCA/FA) за да се истражат полицикличните ароматични јаглеводороди  (PAHs), како што се илит-монтморилонит (IM) и калцит (Ct) во седименти, од две седиментни  средини на терцијарниот креполински базен на лигнит во Србија. Јагленот и седиментните слоеви  се формирани во слатководни мочуришта за време на периодот на долен миоцен. Вкупното  количество на PAHs што можат да се екстрахираат беше одредено со гасна хроматографија со  масен детектор со трократен квадрупол (GC-MS-MS) и беа во опсегот од 449 до 10585 μg l−1 во  сите седименти. Осум од вкупно 16 PAHs рангирани од 175,17 до 658,42 μg l−1 содржат бензо[a]антрацен, хризен, бензо[b]флуорантен, бензо[k]флуорантен, бензо[a]пирен, дибензо[a,h] антрацен, бензо[g,h,i]перилен и индено[1,2,3-cd]пирен; Сите тие се сметаат за потенцијално  канцерогени, укажувајќи на поголема веројатност за настанување несакани еколошки ефекти.  Беше утврдено дека во сите седименти преовладуваат PAHs со средни молекулски тежини  (MMW). Концентрациите на PAHs зависат од повеќе фактори, како што се содржината на  јаглерод, молскиот однос на Н/С и (помалку значајно) молскиот однос на О/С. Непостоењето на  корелација меѓу односот на N/C и други параметри укажува на неспецифични промени што ја придружуваат оригиналната органска материја. Беше утврдено дека седиментните примероци на  калцит со помала содржина на сулфур имаат поголема содржина на PAHs од примероците на IM со повисока содржина на сулфур што наведува на заклучок дека содржината на PAHs во  седиментите може да е поврзана со опкружувањето при таложењето.",
publisher = "Society of Chemists and Technologists of Macedonia",
journal = "Macedonian Journal of Chemistry and Chemical Engineering",
title = "Polycyclic aromatic hydrocarbons in two sedimentary environments of the Tertiary Krepoljin coal basin, Полициклични ароматични јаглеводороди во две седиментни средини на креполинскиот терцијарен јагленов базен",
volume = "42",
number = "1",
pages = "25-36",
doi = "10.20450/mjcce.2023.2552"
}

Dević, G., Pergal, M.,& Pergal, M.. (2023). Polycyclic aromatic hydrocarbons in two sedimentary environments of the Tertiary Krepoljin coal basin. in Macedonian Journal of Chemistry and Chemical Engineering
Society of Chemists and Technologists of Macedonia., 42(1), 25-36.
https://doi.org/10.20450/mjcce.2023.2552

Dević G, Pergal M, Pergal M. Polycyclic aromatic hydrocarbons in two sedimentary environments of the Tertiary Krepoljin coal basin. in Macedonian Journal of Chemistry and Chemical Engineering. 2023;42(1):25-36.
doi:10.20450/mjcce.2023.2552 .

Dević, Gordana, Pergal, Marija, Pergal, Miodrag, "Polycyclic aromatic hydrocarbons in two sedimentary environments of the Tertiary Krepoljin coal basin" in Macedonian Journal of Chemistry and Chemical Engineering, 42, no. 1 (2023):25-36,
https://doi.org/10.20450/mjcce.2023.2552 . .

TY  - JOUR
AU  - Petronijević, Ivan
AU  - Dudić, Duško
AU  - Cerović, Dragana
AU  - Maletić, Slavica
AU  - Marinković, Filip
AU  - Pergal, Marija
AU  - Anđelković, Ljubica
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6198
AB  - The dielectric properties of nanocomposites based on isotactic polypropylene (iPP) and atactic polystyrene (aPS) obtained by novel, simple, and environmentally friendly treatment technique have been analyzed in this study. The best treatment conditions to obtain nanocomposites with embedded core-shell particles with enhanced dielectric properties were considered. Treatment of polymer matrices in water solution iron(II)-chloride had the most pronounced precipitation effect, that was directly related to the appearance of higher transition metal concentrations in the iPP and aPS matrices, in comparison to treatments in the other two transition metal salts, MnCl2 and NiCl2. Relative dielectric constant and loss tangent have been studied in the frequency range from 20 Hz to 9 MHz. Embedded core-shell nanoparticles (from 15 to 150 nm in diameter) in a very small amount (1.72E-8 mol/cm3 to 1.17E-5 mol/cm3) resulted in significant improvement (2.5% up to 9.1%) and stabilization of relative dielectric constant value toward higher frequencies and also lowering loss tangent in compare to starting polymer matrices. These properties indicate that materials obtained with the presented treatment technique can be applied as microelectronic packing and with further development of the method in order to obtain a higher concentration of metal ions as energy storage devices.
PB  - Wiley
T2  - Polymers for Advanced Technologies
T1  - Dielectric properties of iPP and aPS nanocomposites with core-shell particles obtained by treatment in transition metal salt solutions
SP  - 1
EP  - 10
DO  - 10.1002/pat.6110
ER  - 

@article{
author = "Petronijević, Ivan and Dudić, Duško and Cerović, Dragana and Maletić, Slavica and Marinković, Filip and Pergal, Marija and Anđelković, Ljubica",
year = "2023",
abstract = "The dielectric properties of nanocomposites based on isotactic polypropylene (iPP) and atactic polystyrene (aPS) obtained by novel, simple, and environmentally friendly treatment technique have been analyzed in this study. The best treatment conditions to obtain nanocomposites with embedded core-shell particles with enhanced dielectric properties were considered. Treatment of polymer matrices in water solution iron(II)-chloride had the most pronounced precipitation effect, that was directly related to the appearance of higher transition metal concentrations in the iPP and aPS matrices, in comparison to treatments in the other two transition metal salts, MnCl2 and NiCl2. Relative dielectric constant and loss tangent have been studied in the frequency range from 20 Hz to 9 MHz. Embedded core-shell nanoparticles (from 15 to 150 nm in diameter) in a very small amount (1.72E-8 mol/cm3 to 1.17E-5 mol/cm3) resulted in significant improvement (2.5% up to 9.1%) and stabilization of relative dielectric constant value toward higher frequencies and also lowering loss tangent in compare to starting polymer matrices. These properties indicate that materials obtained with the presented treatment technique can be applied as microelectronic packing and with further development of the method in order to obtain a higher concentration of metal ions as energy storage devices.",
publisher = "Wiley",
journal = "Polymers for Advanced Technologies",
title = "Dielectric properties of iPP and aPS nanocomposites with core-shell particles obtained by treatment in transition metal salt solutions",
pages = "1-10",
doi = "10.1002/pat.6110"
}

Petronijević, I., Dudić, D., Cerović, D., Maletić, S., Marinković, F., Pergal, M.,& Anđelković, L.. (2023). Dielectric properties of iPP and aPS nanocomposites with core-shell particles obtained by treatment in transition metal salt solutions. in Polymers for Advanced Technologies
Wiley., 1-10.
https://doi.org/10.1002/pat.6110

Petronijević I, Dudić D, Cerović D, Maletić S, Marinković F, Pergal M, Anđelković L. Dielectric properties of iPP and aPS nanocomposites with core-shell particles obtained by treatment in transition metal salt solutions. in Polymers for Advanced Technologies. 2023;:1-10.
doi:10.1002/pat.6110 .

Petronijević, Ivan, Dudić, Duško, Cerović, Dragana, Maletić, Slavica, Marinković, Filip, Pergal, Marija, Anđelković, Ljubica, "Dielectric properties of iPP and aPS nanocomposites with core-shell particles obtained by treatment in transition metal salt solutions" in Polymers for Advanced Technologies (2023):1-10,
https://doi.org/10.1002/pat.6110 . .

TY  - CONF
AU  - Rašljić Rafajilović, Milena
AU  - Vasiljević-Radović, Dana
AU  - Špirkova, Milena
AU  - Gojgić-Cvijović, Gordana
AU  - Pergal, Marija
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5751
AB  - Polyurethanes (PUs) are widely used polymers, with specific production able to be aimed at their
notable industrial and biomedical applications by carefully changing their ingredients, their ratios
and their preparation procedures. The popularity of PU nanocomposites is caused mainly by the
simplicity of tuning their functional properties. The choice of nanofillers, for example, clay,
graphene oxide, carbon nanotubes, silicon dioxide, nanosilver or nanoferrite is miscellaneous. In
this work, PU/clay nanocomposites were prepared by in situ polymerization in the presence of
organically modified clay (Cloisite 30B) with clay loading of 0.5 wt.%. We used hyperbranched
polyester and 4,4'-methylenediphenyldiisocyanate as hard segment components, while
poly(dimethylsiloxane) macrodiol as soft segment. The influence of the soft segment content on the properties of nanocomposites was investigated by swelling behavior, crosslinking density, degree of phase separation, water absorption and contact angle measurements as well as surface free energy determination. FTIR results showed the higher degree of phase separation in nanocomposites as soft segment content decreased. Moreover, the results showed that equilibrium swelling degree of PU nanocomposites decreases, while crosslinking density increases with decreasing soft segment content. Hydrophobicity of the PU nanocomposites increases with increasing soft segment content, due to the hydrophobic character of PDMS. Namely, the surface free energy of nanocomposites films decreases in the range of 39.8 to 28.0 mJ/m2 with increasing soft segment content, confirming good surface hydrophobicity. Therefore, PU nanocomposites could be considered as promising materials suitable for coating applications.
PB  - Banja Luka : University in Banjaluka, Faculty of Technology
C3  - Book of Abstracts - XIV Conference of Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka
T1  - Surface Characteristics of polyurethane/organoclay nanocomposites
SP  - 195
EP  - 195
UR  - https://hdl.handle.net/21.15107/rcub_cer_5751
ER  - 

@conference{
author = "Rašljić Rafajilović, Milena and Vasiljević-Radović, Dana and Špirkova, Milena and Gojgić-Cvijović, Gordana and Pergal, Marija",
year = "2022",
abstract = "Polyurethanes (PUs) are widely used polymers, with specific production able to be aimed at their
notable industrial and biomedical applications by carefully changing their ingredients, their ratios
and their preparation procedures. The popularity of PU nanocomposites is caused mainly by the
simplicity of tuning their functional properties. The choice of nanofillers, for example, clay,
graphene oxide, carbon nanotubes, silicon dioxide, nanosilver or nanoferrite is miscellaneous. In
this work, PU/clay nanocomposites were prepared by in situ polymerization in the presence of
organically modified clay (Cloisite 30B) with clay loading of 0.5 wt.%. We used hyperbranched
polyester and 4,4'-methylenediphenyldiisocyanate as hard segment components, while
poly(dimethylsiloxane) macrodiol as soft segment. The influence of the soft segment content on the properties of nanocomposites was investigated by swelling behavior, crosslinking density, degree of phase separation, water absorption and contact angle measurements as well as surface free energy determination. FTIR results showed the higher degree of phase separation in nanocomposites as soft segment content decreased. Moreover, the results showed that equilibrium swelling degree of PU nanocomposites decreases, while crosslinking density increases with decreasing soft segment content. Hydrophobicity of the PU nanocomposites increases with increasing soft segment content, due to the hydrophobic character of PDMS. Namely, the surface free energy of nanocomposites films decreases in the range of 39.8 to 28.0 mJ/m2 with increasing soft segment content, confirming good surface hydrophobicity. Therefore, PU nanocomposites could be considered as promising materials suitable for coating applications.",
publisher = "Banja Luka : University in Banjaluka, Faculty of Technology",
journal = "Book of Abstracts - XIV Conference of Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka",
title = "Surface Characteristics of polyurethane/organoclay nanocomposites",
pages = "195-195",
url = "https://hdl.handle.net/21.15107/rcub_cer_5751"
}

Rašljić Rafajilović, M., Vasiljević-Radović, D., Špirkova, M., Gojgić-Cvijović, G.,& Pergal, M.. (2022). Surface Characteristics of polyurethane/organoclay nanocomposites. in Book of Abstracts - XIV Conference of Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka
Banja Luka : University in Banjaluka, Faculty of Technology., 195-195.
https://hdl.handle.net/21.15107/rcub_cer_5751

Rašljić Rafajilović M, Vasiljević-Radović D, Špirkova M, Gojgić-Cvijović G, Pergal M. Surface Characteristics of polyurethane/organoclay nanocomposites. in Book of Abstracts - XIV Conference of Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka. 2022;:195-195.
https://hdl.handle.net/21.15107/rcub_cer_5751 .

Rašljić Rafajilović, Milena, Vasiljević-Radović, Dana, Špirkova, Milena, Gojgić-Cvijović, Gordana, Pergal, Marija, "Surface Characteristics of polyurethane/organoclay nanocomposites" in Book of Abstracts - XIV Conference of Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka (2022):195-195,
https://hdl.handle.net/21.15107/rcub_cer_5751 .

TY  - CONF
AU  - Pergal, Marija
AU  - Kodranov, Igor
AU  - Vasiljević-Radović, Dana
AU  - Steinhart, Milos
AU  - Gojgić-Cvijović, Gordana
AU  - Manojlović, Dragan
AU  - Špirkova, Milena
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5801
AB  - in this study, in situ polymerization procedure in solvent mixture was used for the preparation of thermosetting PU nanocomposites (PUNCs) with different content of soft segment (from 30 to 60 wt%), and with the addition of organomodified montmorillonite clay (Cloisite 30B®) as the nanofiller, in an amount of 0.5 wt.%. The PUNCs were based on poly(dimethylsiloxane) macrodiol (PDMS) that represents soft segment and 4,4′-diphenylmethane diisocyanate (MDI) and hyperbranched polyester (BH-30) which were selected as the hard segment. The PUNCs are marked.
so that the last two numbers in title indicate wt.% of soft segment in materials. Namely, the main 
objective of this study is to analyze the effect of the soft segment content on the morphology of the 
prepared PU nanocomposite films using atomic force microscopy (AFM), scanning electron 
microscopy (SEM), and small- and near wide-angle X-Ray scattering (SWAXS) analyses. SEM 
images of the fractured surfaces were obtained on JEOL JSM-6610LV. AFM analysis was carried 
out by atomic force microscope (Dimension Icon, Bruker, USA). SWAXS measurements of the 
PUNCs were performed using SAXS instrument (originally Molecular Metrology, USA, recently 
considerably upgraded by SAXSLAB, now Xenocs).
PB  - Belgrade : Serbian Academy of Sciences and Arts
PB  - Belgrade : Faculty of Technology and Metallurgy, University of Belgrade
C3  - Program and Book of Abstracts - Second International Conference on Electron Microscopy of Nanostructures, ELMINA 2022, August 22nd-26th, 2022, Belgrade, Serbia
T1  - The effect of poly(dimethylsiloxane) segment content on the morphology of polyurethane composite materials
SP  - 140
EP  - 141
UR  - https://hdl.handle.net/21.15107/rcub_cer_5801
ER  - 

@conference{
author = "Pergal, Marija and Kodranov, Igor and Vasiljević-Radović, Dana and Steinhart, Milos and Gojgić-Cvijović, Gordana and Manojlović, Dragan and Špirkova, Milena",
year = "2022",
abstract = "in this study, in situ polymerization procedure in solvent mixture was used for the preparation of thermosetting PU nanocomposites (PUNCs) with different content of soft segment (from 30 to 60 wt%), and with the addition of organomodified montmorillonite clay (Cloisite 30B®) as the nanofiller, in an amount of 0.5 wt.%. The PUNCs were based on poly(dimethylsiloxane) macrodiol (PDMS) that represents soft segment and 4,4′-diphenylmethane diisocyanate (MDI) and hyperbranched polyester (BH-30) which were selected as the hard segment. The PUNCs are marked.
so that the last two numbers in title indicate wt.% of soft segment in materials. Namely, the main 
objective of this study is to analyze the effect of the soft segment content on the morphology of the 
prepared PU nanocomposite films using atomic force microscopy (AFM), scanning electron 
microscopy (SEM), and small- and near wide-angle X-Ray scattering (SWAXS) analyses. SEM 
images of the fractured surfaces were obtained on JEOL JSM-6610LV. AFM analysis was carried 
out by atomic force microscope (Dimension Icon, Bruker, USA). SWAXS measurements of the 
PUNCs were performed using SAXS instrument (originally Molecular Metrology, USA, recently 
considerably upgraded by SAXSLAB, now Xenocs).",
publisher = "Belgrade : Serbian Academy of Sciences and Arts, Belgrade : Faculty of Technology and Metallurgy, University of Belgrade",
journal = "Program and Book of Abstracts - Second International Conference on Electron Microscopy of Nanostructures, ELMINA 2022, August 22nd-26th, 2022, Belgrade, Serbia",
title = "The effect of poly(dimethylsiloxane) segment content on the morphology of polyurethane composite materials",
pages = "140-141",
url = "https://hdl.handle.net/21.15107/rcub_cer_5801"
}

Pergal, M., Kodranov, I., Vasiljević-Radović, D., Steinhart, M., Gojgić-Cvijović, G., Manojlović, D.,& Špirkova, M.. (2022). The effect of poly(dimethylsiloxane) segment content on the morphology of polyurethane composite materials. in Program and Book of Abstracts - Second International Conference on Electron Microscopy of Nanostructures, ELMINA 2022, August 22nd-26th, 2022, Belgrade, Serbia
Belgrade : Serbian Academy of Sciences and Arts., 140-141.
https://hdl.handle.net/21.15107/rcub_cer_5801

Pergal M, Kodranov I, Vasiljević-Radović D, Steinhart M, Gojgić-Cvijović G, Manojlović D, Špirkova M. The effect of poly(dimethylsiloxane) segment content on the morphology of polyurethane composite materials. in Program and Book of Abstracts - Second International Conference on Electron Microscopy of Nanostructures, ELMINA 2022, August 22nd-26th, 2022, Belgrade, Serbia. 2022;:140-141.
https://hdl.handle.net/21.15107/rcub_cer_5801 .

Pergal, Marija, Kodranov, Igor, Vasiljević-Radović, Dana, Steinhart, Milos, Gojgić-Cvijović, Gordana, Manojlović, Dragan, Špirkova, Milena, "The effect of poly(dimethylsiloxane) segment content on the morphology of polyurethane composite materials" in Program and Book of Abstracts - Second International Conference on Electron Microscopy of Nanostructures, ELMINA 2022, August 22nd-26th, 2022, Belgrade, Serbia (2022):140-141,
https://hdl.handle.net/21.15107/rcub_cer_5801 .

TY  - CONF
AU  - Pergal, Marija
AU  - Kodranov, Igor
AU  - Vasiljević-Radović, Dana
AU  - Nikodinović-Runić, Jasmina
AU  - Dojčinović, Biljana
AU  - Manojlović, Dragan
AU  - Antić, Bratislav
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6363
AB  - Polyurethane (PU) nanocomposites are highly utilized in biomedical devices/implants due to their excellent mechanical properties, good biocompatibility, and low cytotoxicity. These PU nanocomposites with silver nanoparticles are well known potent antimicrobial agents. Biocompatible magnetic nanoparticles such as ferrites has also gained attention especially in various fields of drug delivery, biosensing and magnetic resonance imaging which requires highly specific magnetic nanoparticle (MNP) properties such as uniform size distribution, less agglomeration and stability in the biological medium. Among MNP, copper and zinc ferrites have been broadly applicable in biomedical, optoelectronic, catalysis and drug delivery. With a view to design PU/ferrites nanocomposites and to explore their antimicrobial potential, the present preliminary study reports the preparation of PU nanocomposites with copper ferrite and zinc ferrite (1 wt.%) and with the same composition. The nanocomposites were characterized using water absorption and swelling measurements. The antimicrobial activity of these composites was investigated against four bacterial strains: Staphylococcus aureus, Enterococcus faecium, Pseudomonas aeruginosa, and Klebsiella pneumoniae, and one Candida strain, C. albicans and compared with those of PU nanocomposites with silver ferrite nanoparticles. PU nanocomposites based on zinc and copper ferrites did not show antimicrobial activity, on the contrary they supported microbial attachment and growth. However, PU nanocomposites with silver ferrite did not show significant antibacterial activity but show antifungal activity and it is related with hydrophilicity of the prepared materials.
PB  - Srbija,Niš : RAD  Centre
C3  - RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : the book of abstracts; July 25-29; Herceg Novi, Montenegro
T1  - Polyurethane/ferrites composite materials: A study on antimicrobial activity
SP  - 38
EP  - 38
DO  - 10.21175/rad.sum.abstr.book.2022.11.14
ER  - 

@conference{
author = "Pergal, Marija and Kodranov, Igor and Vasiljević-Radović, Dana and Nikodinović-Runić, Jasmina and Dojčinović, Biljana and Manojlović, Dragan and Antić, Bratislav",
year = "2022",
abstract = "Polyurethane (PU) nanocomposites are highly utilized in biomedical devices/implants due to their excellent mechanical properties, good biocompatibility, and low cytotoxicity. These PU nanocomposites with silver nanoparticles are well known potent antimicrobial agents. Biocompatible magnetic nanoparticles such as ferrites has also gained attention especially in various fields of drug delivery, biosensing and magnetic resonance imaging which requires highly specific magnetic nanoparticle (MNP) properties such as uniform size distribution, less agglomeration and stability in the biological medium. Among MNP, copper and zinc ferrites have been broadly applicable in biomedical, optoelectronic, catalysis and drug delivery. With a view to design PU/ferrites nanocomposites and to explore their antimicrobial potential, the present preliminary study reports the preparation of PU nanocomposites with copper ferrite and zinc ferrite (1 wt.%) and with the same composition. The nanocomposites were characterized using water absorption and swelling measurements. The antimicrobial activity of these composites was investigated against four bacterial strains: Staphylococcus aureus, Enterococcus faecium, Pseudomonas aeruginosa, and Klebsiella pneumoniae, and one Candida strain, C. albicans and compared with those of PU nanocomposites with silver ferrite nanoparticles. PU nanocomposites based on zinc and copper ferrites did not show antimicrobial activity, on the contrary they supported microbial attachment and growth. However, PU nanocomposites with silver ferrite did not show significant antibacterial activity but show antifungal activity and it is related with hydrophilicity of the prepared materials.",
publisher = "Srbija,Niš : RAD  Centre",
journal = "RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : the book of abstracts; July 25-29; Herceg Novi, Montenegro",
title = "Polyurethane/ferrites composite materials: A study on antimicrobial activity",
pages = "38-38",
doi = "10.21175/rad.sum.abstr.book.2022.11.14"
}

Pergal, M., Kodranov, I., Vasiljević-Radović, D., Nikodinović-Runić, J., Dojčinović, B., Manojlović, D.,& Antić, B.. (2022). Polyurethane/ferrites composite materials: A study on antimicrobial activity. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : the book of abstracts; July 25-29; Herceg Novi, Montenegro
Srbija,Niš : RAD  Centre., 38-38.
https://doi.org/10.21175/rad.sum.abstr.book.2022.11.14

Pergal M, Kodranov I, Vasiljević-Radović D, Nikodinović-Runić J, Dojčinović B, Manojlović D, Antić B. Polyurethane/ferrites composite materials: A study on antimicrobial activity. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : the book of abstracts; July 25-29; Herceg Novi, Montenegro. 2022;:38-38.
doi:10.21175/rad.sum.abstr.book.2022.11.14 .

Pergal, Marija, Kodranov, Igor, Vasiljević-Radović, Dana, Nikodinović-Runić, Jasmina, Dojčinović, Biljana, Manojlović, Dragan, Antić, Bratislav, "Polyurethane/ferrites composite materials: A study on antimicrobial activity" in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : the book of abstracts; July 25-29; Herceg Novi, Montenegro (2022):38-38,
https://doi.org/10.21175/rad.sum.abstr.book.2022.11.14 . .

TY  - CONF
AU  - Rašljić Rafajilović, Milena
AU  - Pergal, Marija
AU  - Spasenović, Marko
AU  - Vićentić, Teodora
AU  - Bajuk-Bogdanović, Danica
AU  - Vasiljević-Radović, Dana
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5750
AB  - Laser induced graphenization (LIG) of polymer materials has recognized as the most promising method for fabrication of flexible electronic devices. Poly(dimethylsiloxane) (PDMS) is suitable elastomeric materials for flexible electronics devices fabrication due to outstanding mechanical and optical properties. Namely, the low carbon content and the lacking aromatic structures in PDMS material limit the graphenization process resulting in limited conduction properties. The aim of this study was the graphenization of PDMS and PDMS-based materials by CO2 laser radiation. We prepared pure PDMS elastomer, PDMS/ethylene glycol and PDMS/Triton composite materials by using 20 wt. % of ethylene glycol or Triton in PDMS matrix. Indeed, up to now the evidence of graphenization of these PDMS-based materials has never been observed. PDMS elastomer was prepared by hydrosilylation reaction, while composite materials by blending method. The prepared PDMS-based materials were characterized by Fourier-transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) and Raman spectroscopy. The obtained results showed that surfaces of pure PDMS elastomer and PDMS/ethylene glycol composite cannot be graphenized by direct laser writing. However, by adding Triton as aromatic and carbon sources into the PDMS matrix it is possible to improve the graphenization of PDMS based materials and this material is good candidate for fabrication of flexible electrodes.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia
T1  - Preparation of poly(dimethylsiloxane)-based materials for laser-induced graphenization
SP  - 87
EP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_cer_5750
ER  - 

@conference{
author = "Rašljić Rafajilović, Milena and Pergal, Marija and Spasenović, Marko and Vićentić, Teodora and Bajuk-Bogdanović, Danica and Vasiljević-Radović, Dana",
year = "2022",
abstract = "Laser induced graphenization (LIG) of polymer materials has recognized as the most promising method for fabrication of flexible electronic devices. Poly(dimethylsiloxane) (PDMS) is suitable elastomeric materials for flexible electronics devices fabrication due to outstanding mechanical and optical properties. Namely, the low carbon content and the lacking aromatic structures in PDMS material limit the graphenization process resulting in limited conduction properties. The aim of this study was the graphenization of PDMS and PDMS-based materials by CO2 laser radiation. We prepared pure PDMS elastomer, PDMS/ethylene glycol and PDMS/Triton composite materials by using 20 wt. % of ethylene glycol or Triton in PDMS matrix. Indeed, up to now the evidence of graphenization of these PDMS-based materials has never been observed. PDMS elastomer was prepared by hydrosilylation reaction, while composite materials by blending method. The prepared PDMS-based materials were characterized by Fourier-transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) and Raman spectroscopy. The obtained results showed that surfaces of pure PDMS elastomer and PDMS/ethylene glycol composite cannot be graphenized by direct laser writing. However, by adding Triton as aromatic and carbon sources into the PDMS matrix it is possible to improve the graphenization of PDMS based materials and this material is good candidate for fabrication of flexible electrodes.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia",
title = "Preparation of poly(dimethylsiloxane)-based materials for laser-induced graphenization",
pages = "87-87",
url = "https://hdl.handle.net/21.15107/rcub_cer_5750"
}

Rašljić Rafajilović, M., Pergal, M., Spasenović, M., Vićentić, T., Bajuk-Bogdanović, D.,& Vasiljević-Radović, D.. (2022). Preparation of poly(dimethylsiloxane)-based materials for laser-induced graphenization. in Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia
Belgrade : Serbian Ceramic Society., 87-87.
https://hdl.handle.net/21.15107/rcub_cer_5750

Rašljić Rafajilović M, Pergal M, Spasenović M, Vićentić T, Bajuk-Bogdanović D, Vasiljević-Radović D. Preparation of poly(dimethylsiloxane)-based materials for laser-induced graphenization. in Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia. 2022;:87-87.
https://hdl.handle.net/21.15107/rcub_cer_5750 .

Rašljić Rafajilović, Milena, Pergal, Marija, Spasenović, Marko, Vićentić, Teodora, Bajuk-Bogdanović, Danica, Vasiljević-Radović, Dana, "Preparation of poly(dimethylsiloxane)-based materials for laser-induced graphenization" in Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia (2022):87-87,
https://hdl.handle.net/21.15107/rcub_cer_5750 .

TY  - CONF
AU  - Rašljić Rafajilović, Milena
AU  - Vasiljević-Radović, Dana
AU  - Vorkapić, Miloš
AU  - Pergal, Marija
AU  - Smiljanić, Milče M.
AU  - Živković, Ljiljana
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5749
AB  - Microreactors are microfluidic devices with a network of channels where chemical reactions can take place. The diameter of those channels is less than 1 millimeter. Advances of such devices are reduction of the time required for the synthesis, better control of the reaction and the size of nanoparticles. There are different materials from which microreactors can be fabricated. The most common are silicon (Si), polymers, glass, ceramics and metals. In this study, we used Si/Pyrex glass and poly(dimethylsiloxane) (PDMS) materials to fabricate two types of microreactors. Both types of microreactors had integrated heaters but different length and width of microchannels. Reaction was performed on the same temperature (80⁰C) and with the same reaction time in both microreactors. Synthesis of titanium (IV)-oxide nanoparticles was performed in these microreactors, in order to show how dimension of microchannels can affect the size of nanoparticles. Size distribution of nanoparticles was determined with dynamic light scattering (DLS). It was concluded that dimensions of microchannels had great influence on the size of the nanoparticles.
PB  - Belgrade : Serbian  Ceramic Society
C3  - Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia
T1  - Nanoparticle synthesis in microreactors
SP  - 86
EP  - 86
UR  - https://hdl.handle.net/21.15107/rcub_cer_5749
ER  - 

@conference{
author = "Rašljić Rafajilović, Milena and Vasiljević-Radović, Dana and Vorkapić, Miloš and Pergal, Marija and Smiljanić, Milče M. and Živković, Ljiljana",
year = "2022",
abstract = "Microreactors are microfluidic devices with a network of channels where chemical reactions can take place. The diameter of those channels is less than 1 millimeter. Advances of such devices are reduction of the time required for the synthesis, better control of the reaction and the size of nanoparticles. There are different materials from which microreactors can be fabricated. The most common are silicon (Si), polymers, glass, ceramics and metals. In this study, we used Si/Pyrex glass and poly(dimethylsiloxane) (PDMS) materials to fabricate two types of microreactors. Both types of microreactors had integrated heaters but different length and width of microchannels. Reaction was performed on the same temperature (80⁰C) and with the same reaction time in both microreactors. Synthesis of titanium (IV)-oxide nanoparticles was performed in these microreactors, in order to show how dimension of microchannels can affect the size of nanoparticles. Size distribution of nanoparticles was determined with dynamic light scattering (DLS). It was concluded that dimensions of microchannels had great influence on the size of the nanoparticles.",
publisher = "Belgrade : Serbian  Ceramic Society",
journal = "Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia",
title = "Nanoparticle synthesis in microreactors",
pages = "86-86",
url = "https://hdl.handle.net/21.15107/rcub_cer_5749"
}

Rašljić Rafajilović, M., Vasiljević-Radović, D., Vorkapić, M., Pergal, M., Smiljanić, M. M.,& Živković, L.. (2022). Nanoparticle synthesis in microreactors. in Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia
Belgrade : Serbian  Ceramic Society., 86-86.
https://hdl.handle.net/21.15107/rcub_cer_5749

Rašljić Rafajilović M, Vasiljević-Radović D, Vorkapić M, Pergal M, Smiljanić MM, Živković L. Nanoparticle synthesis in microreactors. in Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia. 2022;:86-86.
https://hdl.handle.net/21.15107/rcub_cer_5749 .

Rašljić Rafajilović, Milena, Vasiljević-Radović, Dana, Vorkapić, Miloš, Pergal, Marija, Smiljanić, Milče M., Živković, Ljiljana, "Nanoparticle synthesis in microreactors" in Program and the book of abstracts - Serbian Ceramic Society Conference - Advanced Ceramics and Application X - New Frontiers in Multifunctional Material Science and Processing, 26-27. September 2022, Belgrade, Serbia (2022):86-86,
https://hdl.handle.net/21.15107/rcub_cer_5749 .

TY  - CONF
AU  - Rašljić Rafajilović, Milena
AU  - Vasiljević-Radović, Dana
AU  - Vićentić, Teodora
AU  - Spasenović, Marko
AU  - Bošković, Marko
AU  - Pašti, Igor
AU  - Pergal, Marija
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5723
AB  - Laser-induced graphene (LIG) is one of the most promising graphene-based materials for the
fabrication of flexible electronic devices. However, despite huge efforts to develop LIG on new
substrates there is a lack of stretchable polymers convenient for laser graphenization.
Poly(dimethylsiloxane) is elastomer suitable for flexible electronic fabrication due to excellent
flexibility, optical transparency, hydrophobicity, UV-resistance and good thermal and oxidative
stability. Unfortunately, PDMS cannot be easily graphenized by direct laser writing because of the
low amount of carbon linked to the siloxane chains, mainly consisting of methyl groups. In this
study, a series of PDMS/Triton materials with different concentrations of Triton (1-30 wt.%) was
prepared by casted-based approach starting from divinyl-terminated-PDMS and poly(methylhydrogensiloxane).
Furthermore, direct laser graphenization of PDMS/Triton materials is proposed
for the first time. Different laser parameters and multiple writing steps have been examined in order
to induce a graphene-like structure on PDMS/Triton and to increase as much as possible its
conductivity. The prepared PDMS/Triton/graphene composites were characterized by Raman
spectroscopy, scanning electron microscopy (SEM) and sheet resistance measurements. The results
revealed that by adding Triton it is possible to enhance the graphenization degree. The obtained
PDMS/Triton/graphene composites are suitable candidates for flexible microsupercapacitor
fabrication.
PB  - Banja Luka : University in Banjaluka, Faculty of  Technology
C3  - Book of Abstracts - XIV Conference of  Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka
T1  - Characterization of poly(dimethylsiloxane)/laser-induced graphene composites
SP  - 196
UR  - https://hdl.handle.net/21.15107/rcub_cer_5723
ER  - 

@conference{
author = "Rašljić Rafajilović, Milena and Vasiljević-Radović, Dana and Vićentić, Teodora and Spasenović, Marko and Bošković, Marko and Pašti, Igor and Pergal, Marija",
year = "2022",
abstract = "Laser-induced graphene (LIG) is one of the most promising graphene-based materials for the
fabrication of flexible electronic devices. However, despite huge efforts to develop LIG on new
substrates there is a lack of stretchable polymers convenient for laser graphenization.
Poly(dimethylsiloxane) is elastomer suitable for flexible electronic fabrication due to excellent
flexibility, optical transparency, hydrophobicity, UV-resistance and good thermal and oxidative
stability. Unfortunately, PDMS cannot be easily graphenized by direct laser writing because of the
low amount of carbon linked to the siloxane chains, mainly consisting of methyl groups. In this
study, a series of PDMS/Triton materials with different concentrations of Triton (1-30 wt.%) was
prepared by casted-based approach starting from divinyl-terminated-PDMS and poly(methylhydrogensiloxane).
Furthermore, direct laser graphenization of PDMS/Triton materials is proposed
for the first time. Different laser parameters and multiple writing steps have been examined in order
to induce a graphene-like structure on PDMS/Triton and to increase as much as possible its
conductivity. The prepared PDMS/Triton/graphene composites were characterized by Raman
spectroscopy, scanning electron microscopy (SEM) and sheet resistance measurements. The results
revealed that by adding Triton it is possible to enhance the graphenization degree. The obtained
PDMS/Triton/graphene composites are suitable candidates for flexible microsupercapacitor
fabrication.",
publisher = "Banja Luka : University in Banjaluka, Faculty of  Technology",
journal = "Book of Abstracts - XIV Conference of  Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka",
title = "Characterization of poly(dimethylsiloxane)/laser-induced graphene composites",
pages = "196",
url = "https://hdl.handle.net/21.15107/rcub_cer_5723"
}

Rašljić Rafajilović, M., Vasiljević-Radović, D., Vićentić, T., Spasenović, M., Bošković, M., Pašti, I.,& Pergal, M.. (2022). Characterization of poly(dimethylsiloxane)/laser-induced graphene composites. in Book of Abstracts - XIV Conference of  Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka
Banja Luka : University in Banjaluka, Faculty of  Technology., 196.
https://hdl.handle.net/21.15107/rcub_cer_5723

Rašljić Rafajilović M, Vasiljević-Radović D, Vićentić T, Spasenović M, Bošković M, Pašti I, Pergal M. Characterization of poly(dimethylsiloxane)/laser-induced graphene composites. in Book of Abstracts - XIV Conference of  Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka. 2022;:196.
https://hdl.handle.net/21.15107/rcub_cer_5723 .

Rašljić Rafajilović, Milena, Vasiljević-Radović, Dana, Vićentić, Teodora, Spasenović, Marko, Bošković, Marko, Pašti, Igor, Pergal, Marija, "Characterization of poly(dimethylsiloxane)/laser-induced graphene composites" in Book of Abstracts - XIV Conference of  Chemists, Technologists and Environmentalists of Republic of Srpska, October 21-22, 2022, Banja Luka (2022):196,
https://hdl.handle.net/21.15107/rcub_cer_5723 .

TY  - JOUR
AU  - Pergal, Marija
AU  - Gojgić-Cvijović, Gordana
AU  - Steinhart, Miloš
AU  - Manojlović, Dragan
AU  - Ostojić, Sanja
AU  - Pezo, Lato
AU  - Špírková, Milena
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5237
AB  - A series of novel polyurethane network/organoclay nanocomposites (PUN-NCs) with different soft segment contents (30–60 wt%) was prepared by in situ polymerization in solution and characterized. PU network (PUN) was made from poly(dimethylsiloxane)-based macrodiol as the soft segment and 4,4′-methylenediphenyldiisocyanate and hyperbranched polyester of the third pseudo generation as the hard segment. Nanocomposites were obtained by dispersion of organically modified montmorillonite (Cloisite 30B) nanofiller (0.5 wt%). The influence of the soft segment content on the functional properties of PUN-NCs was studied by Fourier transform infrared (FTIR), small-angle and near wide-angle X-ray scattering (SWAXS), thermogravimetric analysis (TGA), dynamic mechanical thermal analyses (DMTA), differential scanning calorimetry (DSC), nanoindentation, atomic force microscopy (AFM), scanning electron microscopy (SEM), and swelling behavior, water absorption and contact angle measurements. The biodegradation process was evaluated using mixed cultures of microorganisms that originated from soil. Mechanically strong PUN-NC materials in the form of films were obtained, pointing to good dispersion and the existence of exfoliated morphology of Cloisite 30B within the PUN matrix, and the nanocomposites with the abovementioned characteristics were obtained as a function of the soft segment content. The decrease of the soft segment content induced a higher degree of phase separated microstructure, increase of Young's modulus, hardness, plasticity, storage modulus, glass transition temperature, surface free energy and swelling ability in tetrahydrofuran, but at the same time, it is responsible for the decrease of crosslinking density and hydrophobicity of PUN-NCs. By choosing adequate soft segment content, the prepared materials can potentially be designed for coating applications, such as top coating materials in environmental conditions.
PB  - Elsevier
T2  - Progress in Organic Coatings
T1  - Novel polyurethane network/organoclay nanocomposites: Microstructure and physicochemical properties
VL  - 163
IS  - 106664
DO  - 10.1016/j.porgcoat.2021.106664
ER  - 

@article{
author = "Pergal, Marija and Gojgić-Cvijović, Gordana and Steinhart, Miloš and Manojlović, Dragan and Ostojić, Sanja and Pezo, Lato and Špírková, Milena",
year = "2022",
abstract = "A series of novel polyurethane network/organoclay nanocomposites (PUN-NCs) with different soft segment contents (30–60 wt%) was prepared by in situ polymerization in solution and characterized. PU network (PUN) was made from poly(dimethylsiloxane)-based macrodiol as the soft segment and 4,4′-methylenediphenyldiisocyanate and hyperbranched polyester of the third pseudo generation as the hard segment. Nanocomposites were obtained by dispersion of organically modified montmorillonite (Cloisite 30B) nanofiller (0.5 wt%). The influence of the soft segment content on the functional properties of PUN-NCs was studied by Fourier transform infrared (FTIR), small-angle and near wide-angle X-ray scattering (SWAXS), thermogravimetric analysis (TGA), dynamic mechanical thermal analyses (DMTA), differential scanning calorimetry (DSC), nanoindentation, atomic force microscopy (AFM), scanning electron microscopy (SEM), and swelling behavior, water absorption and contact angle measurements. The biodegradation process was evaluated using mixed cultures of microorganisms that originated from soil. Mechanically strong PUN-NC materials in the form of films were obtained, pointing to good dispersion and the existence of exfoliated morphology of Cloisite 30B within the PUN matrix, and the nanocomposites with the abovementioned characteristics were obtained as a function of the soft segment content. The decrease of the soft segment content induced a higher degree of phase separated microstructure, increase of Young's modulus, hardness, plasticity, storage modulus, glass transition temperature, surface free energy and swelling ability in tetrahydrofuran, but at the same time, it is responsible for the decrease of crosslinking density and hydrophobicity of PUN-NCs. By choosing adequate soft segment content, the prepared materials can potentially be designed for coating applications, such as top coating materials in environmental conditions.",
publisher = "Elsevier",
journal = "Progress in Organic Coatings",
title = "Novel polyurethane network/organoclay nanocomposites: Microstructure and physicochemical properties",
volume = "163",
number = "106664",
doi = "10.1016/j.porgcoat.2021.106664"
}

Pergal, M., Gojgić-Cvijović, G., Steinhart, M., Manojlović, D., Ostojić, S., Pezo, L.,& Špírková, M.. (2022). Novel polyurethane network/organoclay nanocomposites: Microstructure and physicochemical properties. in Progress in Organic Coatings
Elsevier., 163(106664).
https://doi.org/10.1016/j.porgcoat.2021.106664

Pergal M, Gojgić-Cvijović G, Steinhart M, Manojlović D, Ostojić S, Pezo L, Špírková M. Novel polyurethane network/organoclay nanocomposites: Microstructure and physicochemical properties. in Progress in Organic Coatings. 2022;163(106664).
doi:10.1016/j.porgcoat.2021.106664 .

Pergal, Marija, Gojgić-Cvijović, Gordana, Steinhart, Miloš, Manojlović, Dragan, Ostojić, Sanja, Pezo, Lato, Špírková, Milena, "Novel polyurethane network/organoclay nanocomposites: Microstructure and physicochemical properties" in Progress in Organic Coatings, 163, no. 106664 (2022),
https://doi.org/10.1016/j.porgcoat.2021.106664 . .

TY  - CONF
AU  - Petronijević, Ivan
AU  - Dudić, Duško
AU  - Cerović, Dragana
AU  - Maletić, Slavica
AU  - Marinković, Filip
AU  - Pergal, Marija
AU  - Anđelković, Ljubica
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6023
AB  - Polymer nanocomposites are prepared by a simple and environmentally friendly technique. First, sheets of isotactic polypropylene (iPP) and atactic polystyrene (aPS) were prepared by compression molding with Servitec Polystat Press 200 T at 473.15 K and 3.0 MPa pressure followed by quenching in water at room temperature. The polymer sheets thus prepared were then immersed separately in three saturated salt water solutions (MnCl2, FeCl2, and NiCl2), at two temperatures (23ºC and 90ºC), and under influence of two DC electrical potentials (+4 kV, and ground potential). Count profiles and generated images of TOF – SIMS records have shown that higher temperature treatment (90ºC) and positive potential (+4kV) have given the highest count of iron ions and better distribution and dispersion of nanoparticles in polymer matrices. Also, the measured concentration of transition metals by ICP-OES confirmed higher concentrations of metals in nanocomposites obtained by these treatment conditions. It was stated that iron(II)-chloride had the highest concentration in iPP and aPS matrices in comparison to the other two transition salts. TEM micrographs showed spherically-shaped cores in the core-shell system and agglomerated particles of irregular shape. Encapsulation of iron cores prevented nanoparticles
from agglomeration. The cores of the investigated particles were probably iron oxides and/or hydroxides that occurred during the hydrolysis of iron salts in deionized water solution. Dielectric properties of obtained nanodielectrics were investigated. Relative dielectric constant and loss tangent has been studied in the frequency range from 20 Hz to 9 MHz. It was shown that adding the small amount of core-shell nanoparticles (from 15 nm to 150 nm in diameter) in a very small amount (1.72E-8 mol/cm3 to 1.17E-5 mol/cm3) are resulted in significant improvement and stabilization of relative dielectric constant value and also lowering loss tangent in compare to starting polymer matrices.These dielectric properties were marked as suitable for nanodielectric application for high speed and high dencity microelectronic packaging.
PB  - Belgrade : SANU
C3  - The Book of Abstracts, The 11th International Conference of the Balkan Physical Union, 28 August - 1 September, 2022, Belgrade, Serbia
T1  - Polymer nanocomposites filled with core-shell nanoparticles for nanodielectric application
SP  - 130
EP  - 130
UR  - https://hdl.handle.net/21.15107/rcub_cer_6023
ER  - 

@conference{
author = "Petronijević, Ivan and Dudić, Duško and Cerović, Dragana and Maletić, Slavica and Marinković, Filip and Pergal, Marija and Anđelković, Ljubica",
year = "2022",
abstract = "Polymer nanocomposites are prepared by a simple and environmentally friendly technique. First, sheets of isotactic polypropylene (iPP) and atactic polystyrene (aPS) were prepared by compression molding with Servitec Polystat Press 200 T at 473.15 K and 3.0 MPa pressure followed by quenching in water at room temperature. The polymer sheets thus prepared were then immersed separately in three saturated salt water solutions (MnCl2, FeCl2, and NiCl2), at two temperatures (23ºC and 90ºC), and under influence of two DC electrical potentials (+4 kV, and ground potential). Count profiles and generated images of TOF – SIMS records have shown that higher temperature treatment (90ºC) and positive potential (+4kV) have given the highest count of iron ions and better distribution and dispersion of nanoparticles in polymer matrices. Also, the measured concentration of transition metals by ICP-OES confirmed higher concentrations of metals in nanocomposites obtained by these treatment conditions. It was stated that iron(II)-chloride had the highest concentration in iPP and aPS matrices in comparison to the other two transition salts. TEM micrographs showed spherically-shaped cores in the core-shell system and agglomerated particles of irregular shape. Encapsulation of iron cores prevented nanoparticles
from agglomeration. The cores of the investigated particles were probably iron oxides and/or hydroxides that occurred during the hydrolysis of iron salts in deionized water solution. Dielectric properties of obtained nanodielectrics were investigated. Relative dielectric constant and loss tangent has been studied in the frequency range from 20 Hz to 9 MHz. It was shown that adding the small amount of core-shell nanoparticles (from 15 nm to 150 nm in diameter) in a very small amount (1.72E-8 mol/cm3 to 1.17E-5 mol/cm3) are resulted in significant improvement and stabilization of relative dielectric constant value and also lowering loss tangent in compare to starting polymer matrices.These dielectric properties were marked as suitable for nanodielectric application for high speed and high dencity microelectronic packaging.",
publisher = "Belgrade : SANU",
journal = "The Book of Abstracts, The 11th International Conference of the Balkan Physical Union, 28 August - 1 September, 2022, Belgrade, Serbia",
title = "Polymer nanocomposites filled with core-shell nanoparticles for nanodielectric application",
pages = "130-130",
url = "https://hdl.handle.net/21.15107/rcub_cer_6023"
}

Petronijević, I., Dudić, D., Cerović, D., Maletić, S., Marinković, F., Pergal, M.,& Anđelković, L.. (2022). Polymer nanocomposites filled with core-shell nanoparticles for nanodielectric application. in The Book of Abstracts, The 11th International Conference of the Balkan Physical Union, 28 August - 1 September, 2022, Belgrade, Serbia
Belgrade : SANU., 130-130.
https://hdl.handle.net/21.15107/rcub_cer_6023

Petronijević I, Dudić D, Cerović D, Maletić S, Marinković F, Pergal M, Anđelković L. Polymer nanocomposites filled with core-shell nanoparticles for nanodielectric application. in The Book of Abstracts, The 11th International Conference of the Balkan Physical Union, 28 August - 1 September, 2022, Belgrade, Serbia. 2022;:130-130.
https://hdl.handle.net/21.15107/rcub_cer_6023 .

Petronijević, Ivan, Dudić, Duško, Cerović, Dragana, Maletić, Slavica, Marinković, Filip, Pergal, Marija, Anđelković, Ljubica, "Polymer nanocomposites filled with core-shell nanoparticles for nanodielectric application" in The Book of Abstracts, The 11th International Conference of the Balkan Physical Union, 28 August - 1 September, 2022, Belgrade, Serbia (2022):130-130,
https://hdl.handle.net/21.15107/rcub_cer_6023 .

TY  - JOUR
AU  - Pergal, Marija
AU  - Dojčinović, Biljana
AU  - Nikodinović-Runić, Jasmina
AU  - Dražić, Goran
AU  - Zabukovec Logar, Nataša
AU  - Ostojić, Sanja
AU  - Antić, Bratislav
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5586
AB  - In situ polymerization was used to produce novel AgFeO2@PEG/polyurethane network nanocomposites (NP-PUs) with 30–60 wt% of soft poly(dimethylsiloxane) segments in polyurethane (PU), containing 1 wt% of PEG-coated AgFeO2 nanoparticles, AgFeO2@PEG. Physicochemical properties and in vitro biological activity of the NP-PUs were systematically evaluated in terms of AgFeO2@PEG (NP) addition and soft segment content. High-angle annular dark-field transmission electron microscopy showed that the nanoparticles were generally uniformly distributed in the PU matrix. Increased soft segment content caused significantly increased intensity of the broad, amorphous X-ray diffraction peaks of crystalline AgFeO2, probably because the chemical composition of PU affected the distribution of nanoparticles. The Young modulus, hardness, and plasticity of the NP-PUs were higher than for pure PU and increased with decreasing soft segment content. Decreased soft segment content induced higher microphase separation, increased hydrophilicity and swelling ability, but decreased cross-linking density. Additionally, NP-PUs had higher glass transition temperatures, improved thermal stability, and enhanced nanomechanical performance over pure PU. The NP-PUs demonstrated good selective inhibition of Candida albicans and Candida parapsilosis (30–55%) and no pronounced cytotoxicity to MRC5 human lung fibroblasts. Among the investigated AgFeO2@PEG/PUs, the best antifungal activity was shown by composites with 30 and 40 wt% soft segments. Consequently, the novel AgFeO2@PEG/polyurethane network nanocomposites could be further optimized to be used as biocompatible surfaces that also prevent formation of fungal biofilms.
PB  - Springer
T2  - Journal of Materials Science
T1  - Synthesis, physicochemical, and antimicrobial characteristics of novel poly(urethane-siloxane) network/silver ferrite nanocomposites
VL  - 57
IS  - 16
SP  - 7827
EP  - 7848
DO  - 10.1007/s10853-022-07178-9
ER  - 

@article{
author = "Pergal, Marija and Dojčinović, Biljana and Nikodinović-Runić, Jasmina and Dražić, Goran and Zabukovec Logar, Nataša and Ostojić, Sanja and Antić, Bratislav",
year = "2022",
abstract = "In situ polymerization was used to produce novel AgFeO2@PEG/polyurethane network nanocomposites (NP-PUs) with 30–60 wt% of soft poly(dimethylsiloxane) segments in polyurethane (PU), containing 1 wt% of PEG-coated AgFeO2 nanoparticles, AgFeO2@PEG. Physicochemical properties and in vitro biological activity of the NP-PUs were systematically evaluated in terms of AgFeO2@PEG (NP) addition and soft segment content. High-angle annular dark-field transmission electron microscopy showed that the nanoparticles were generally uniformly distributed in the PU matrix. Increased soft segment content caused significantly increased intensity of the broad, amorphous X-ray diffraction peaks of crystalline AgFeO2, probably because the chemical composition of PU affected the distribution of nanoparticles. The Young modulus, hardness, and plasticity of the NP-PUs were higher than for pure PU and increased with decreasing soft segment content. Decreased soft segment content induced higher microphase separation, increased hydrophilicity and swelling ability, but decreased cross-linking density. Additionally, NP-PUs had higher glass transition temperatures, improved thermal stability, and enhanced nanomechanical performance over pure PU. The NP-PUs demonstrated good selective inhibition of Candida albicans and Candida parapsilosis (30–55%) and no pronounced cytotoxicity to MRC5 human lung fibroblasts. Among the investigated AgFeO2@PEG/PUs, the best antifungal activity was shown by composites with 30 and 40 wt% soft segments. Consequently, the novel AgFeO2@PEG/polyurethane network nanocomposites could be further optimized to be used as biocompatible surfaces that also prevent formation of fungal biofilms.",
publisher = "Springer",
journal = "Journal of Materials Science",
title = "Synthesis, physicochemical, and antimicrobial characteristics of novel poly(urethane-siloxane) network/silver ferrite nanocomposites",
volume = "57",
number = "16",
pages = "7827-7848",
doi = "10.1007/s10853-022-07178-9"
}

Pergal, M., Dojčinović, B., Nikodinović-Runić, J., Dražić, G., Zabukovec Logar, N., Ostojić, S.,& Antić, B.. (2022). Synthesis, physicochemical, and antimicrobial characteristics of novel poly(urethane-siloxane) network/silver ferrite nanocomposites. in Journal of Materials Science
Springer., 57(16), 7827-7848.
https://doi.org/10.1007/s10853-022-07178-9

Pergal M, Dojčinović B, Nikodinović-Runić J, Dražić G, Zabukovec Logar N, Ostojić S, Antić B. Synthesis, physicochemical, and antimicrobial characteristics of novel poly(urethane-siloxane) network/silver ferrite nanocomposites. in Journal of Materials Science. 2022;57(16):7827-7848.
doi:10.1007/s10853-022-07178-9 .

Pergal, Marija, Dojčinović, Biljana, Nikodinović-Runić, Jasmina, Dražić, Goran, Zabukovec Logar, Nataša, Ostojić, Sanja, Antić, Bratislav, "Synthesis, physicochemical, and antimicrobial characteristics of novel poly(urethane-siloxane) network/silver ferrite nanocomposites" in Journal of Materials Science, 57, no. 16 (2022):7827-7848,
https://doi.org/10.1007/s10853-022-07178-9 . .

TY  - JOUR
AU  - Nićetin, Milica
AU  - Pezo, Lato
AU  - Pergal, Marija
AU  - Lončar, Biljana
AU  - Filipović, Vladimir
AU  - Knežević, Violeta
AU  - Demir, Hande
AU  - Filipović, Jelena
AU  - Manojlović, Dragan
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5582
AB  - The osmotic dehydration (OD) of celery root in sugar beet molasses was studied at three temperatures (20, 35, and 50 °C) and three immersion periods (1, 3, and 5 h) in order to examine the changes in antioxidant potential and phenolic profile of celery root throughout the process. The antioxidant capacity (AOC) of dehydrated samples was evaluated by spectrophotometric and polarographic assays, the total phenolic content by the Folin-Ciocalteu method, and the individual phenolic compounds by HPLC-DAD. As a result of OD in molasses, the AOC and phenols content in samples increased proportionally to the augmentation of temperature and the immersion time. Vanillic acid, syringic acid, and catechin were detected in dehydrated samples as a result of transfer from molasses. Compared to fresh celery root, the content of identified phenols in osmodehydrated samples was improved from 1.5 to 6.2 times. Strong correlations between applied assays were obtained, except for the DPPH. Based on the correlation analysis chlorogenic acid, gallic acid, chrysin, catechin, and kaempferol showed the greatest contribution to the overall AOC of osmodehydrated celery root. Molasses, an agro-industrial waste from sugar production, could be valorized as a valuable osmotic solution.
PB  - MDPI
T2  - Foods
T1  - Celery Root Phenols Content, Antioxidant Capacities and Their Correlations after Osmotic Dehydration in Molasses
VL  - 11
IS  - 13
SP  - 1945
DO  - 10.3390/foods11131945
ER  - 

@article{
author = "Nićetin, Milica and Pezo, Lato and Pergal, Marija and Lončar, Biljana and Filipović, Vladimir and Knežević, Violeta and Demir, Hande and Filipović, Jelena and Manojlović, Dragan",
year = "2022",
abstract = "The osmotic dehydration (OD) of celery root in sugar beet molasses was studied at three temperatures (20, 35, and 50 °C) and three immersion periods (1, 3, and 5 h) in order to examine the changes in antioxidant potential and phenolic profile of celery root throughout the process. The antioxidant capacity (AOC) of dehydrated samples was evaluated by spectrophotometric and polarographic assays, the total phenolic content by the Folin-Ciocalteu method, and the individual phenolic compounds by HPLC-DAD. As a result of OD in molasses, the AOC and phenols content in samples increased proportionally to the augmentation of temperature and the immersion time. Vanillic acid, syringic acid, and catechin were detected in dehydrated samples as a result of transfer from molasses. Compared to fresh celery root, the content of identified phenols in osmodehydrated samples was improved from 1.5 to 6.2 times. Strong correlations between applied assays were obtained, except for the DPPH. Based on the correlation analysis chlorogenic acid, gallic acid, chrysin, catechin, and kaempferol showed the greatest contribution to the overall AOC of osmodehydrated celery root. Molasses, an agro-industrial waste from sugar production, could be valorized as a valuable osmotic solution.",
publisher = "MDPI",
journal = "Foods",
title = "Celery Root Phenols Content, Antioxidant Capacities and Their Correlations after Osmotic Dehydration in Molasses",
volume = "11",
number = "13",
pages = "1945",
doi = "10.3390/foods11131945"
}

Nićetin, M., Pezo, L., Pergal, M., Lončar, B., Filipović, V., Knežević, V., Demir, H., Filipović, J.,& Manojlović, D.. (2022). Celery Root Phenols Content, Antioxidant Capacities and Their Correlations after Osmotic Dehydration in Molasses. in Foods
MDPI., 11(13), 1945.
https://doi.org/10.3390/foods11131945

Nićetin M, Pezo L, Pergal M, Lončar B, Filipović V, Knežević V, Demir H, Filipović J, Manojlović D. Celery Root Phenols Content, Antioxidant Capacities and Their Correlations after Osmotic Dehydration in Molasses. in Foods. 2022;11(13):1945.
doi:10.3390/foods11131945 .

Nićetin, Milica, Pezo, Lato, Pergal, Marija, Lončar, Biljana, Filipović, Vladimir, Knežević, Violeta, Demir, Hande, Filipović, Jelena, Manojlović, Dragan, "Celery Root Phenols Content, Antioxidant Capacities and Their Correlations after Osmotic Dehydration in Molasses" in Foods, 11, no. 13 (2022):1945,
https://doi.org/10.3390/foods11131945 . .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Pergal, Marija
AU  - Ivanov, Toni
AU  - Baltić, Marija
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5379
AB  - Three-dimensional printed plastic products developed through fused deposition
modelling (FDM) take long-term mechanical loading in most industrial prototypes.
This article focuses on the impact of the 3D printing parameters, type of thermal
treatment and variation of characteristic dimensions of standard specimens on the
tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for
thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl
powder were heated to the melting temperature of the filament (200 °C), while
the processing of the plastered specimens was performed at a temperature of
100 °C. After treatment, the specimens were cooled at room temperature (25 °C),
and the dimensions of the annealed and untreated specimens were controlled.
The tensile test of the specimens was performed on the universal test machine.
The response surface methodology (RSM) is employed to predict the tensile stress
by undertaking input parameters. The analysis of variance (ANOVA) results
revealed that the untreated specimens, orientation – 45/45 and layer thickness of
0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed
a significant increase in tensile strength, while the best specimens were obtained
after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.
PB  - Belgrade, Serbia : Balkan Scientific Centre
T2  - Tribology and Materials
T1  - Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology
VL  - 1
IS  - 2
SP  - 70
EP  - 80
DO  - 10.46793/tribomat.2022.009
ER  - 

@article{
author = "Vorkapić, Miloš and Mladenović, Ivana and Pergal, Marija and Ivanov, Toni and Baltić, Marija",
year = "2022",
abstract = "Three-dimensional printed plastic products developed through fused deposition
modelling (FDM) take long-term mechanical loading in most industrial prototypes.
This article focuses on the impact of the 3D printing parameters, type of thermal
treatment and variation of characteristic dimensions of standard specimens on the
tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for
thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl
powder were heated to the melting temperature of the filament (200 °C), while
the processing of the plastered specimens was performed at a temperature of
100 °C. After treatment, the specimens were cooled at room temperature (25 °C),
and the dimensions of the annealed and untreated specimens were controlled.
The tensile test of the specimens was performed on the universal test machine.
The response surface methodology (RSM) is employed to predict the tensile stress
by undertaking input parameters. The analysis of variance (ANOVA) results
revealed that the untreated specimens, orientation – 45/45 and layer thickness of
0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed
a significant increase in tensile strength, while the best specimens were obtained
after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.",
publisher = "Belgrade, Serbia : Balkan Scientific Centre",
journal = "Tribology and Materials",
title = "Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology",
volume = "1",
number = "2",
pages = "70-80",
doi = "10.46793/tribomat.2022.009"
}

Vorkapić, M., Mladenović, I., Pergal, M., Ivanov, T.,& Baltić, M.. (2022). Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology. in Tribology and Materials
Belgrade, Serbia : Balkan Scientific Centre., 1(2), 70-80.
https://doi.org/10.46793/tribomat.2022.009

Vorkapić M, Mladenović I, Pergal M, Ivanov T, Baltić M. Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology. in Tribology and Materials. 2022;1(2):70-80.
doi:10.46793/tribomat.2022.009 .

Vorkapić, Miloš, Mladenović, Ivana, Pergal, Marija, Ivanov, Toni, Baltić, Marija, "Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology" in Tribology and Materials, 1, no. 2 (2022):70-80,
https://doi.org/10.46793/tribomat.2022.009 . .

TY  - JOUR
AU  - Pergal, Marija
AU  - Ostojić, Sanja
AU  - Steinhart, Miloš
AU  - Stefanović, Ivan
AU  - Pezo, Lato
AU  - Spírková, Milena
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5615
AB  - Thermoplastic poly(urethane-siloxane)/organoclay nanocomposites (TPU NCs) with different hard segment content (20–55 wt. %) were prepared by in situ polymerization in the presence of organically modified montmorillonite as a nanofiller (Cloisite 30B; 1 wt. %). Hydroxyl-terminated ethoxypropyl- poly(dimethylsiloxane) was used as soft segment, while 4,4'-methylenediphenyl diisocyanate and 1,4-butanediol were the hard segment components. The study of the influence of the hard segment content on the functional properties of TPU NCs was performed by Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometry (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), dynamic mechanical thermal analyses (DMTA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), water contact angle and water absorption tests. The results revealed that TPU NCs with the increasing hard segment content exhibit higher values of degree of microphase separation, melting temperature of the hard segments, degree of crystallinity, storage modulus (except for TPU NC-55), but lower thermal stability and hydrophobicity. TPU NC films were hydrophobic and their free surface energy was in the range from 17.7 to 24.9 mJ m-2. This work highlights how the composition of TPU NCs would affect their functional properties and provide an additional composition intended for designing advanced TPU NC materials for special biomedical applications.
AB  - Термопластични поли(уретан-силоксан)/органоглина нанокомпозити (TPU NCs) са различитим садржајем тврдих сегмената (20–55 теж. %) припремљени су in situ полимеризацијом у присуству органски модификованог монтморилонита као нанопуниoца (Cloisite 30B; 1 теж. %). Као меки сегмент коришћен је хидроксиетоксипропил терминирани поли(диметилсилоксан), а као компоненте тврдог сегмента коршћени су 4,4'-  -метилендифенилдиизоцијанат и 1,4-бутандиол. Проучавање утицаја садржаја тврдог сегмента на функционална својства TPU NCs је испитивано FTIR спектроскопијом, дифракцијом X-зрака (XRD), микроскопијом атомских сила (AFM), скенирајућом електронском микроскопијом (SEM), динамичко механичко термичком анализом (DMTA), диференцијално скенирајућом калориметријом (DSC), термогравиметријском анализом (TGA), тестовима одређивања контактног угла са водом и апсорпције воде. Резултати су показали да TPU NCs са већим садржајем тврдих сегмената показују веће вредности степена микрофазне сепарације, температуре топљења тврдих сегмената, степена кристалиничности, модула сачуване енергије (осим за TPU NC-55), али нижу термичку стабилност и хидрофобност. TPU NC филмови су били хидрофобни и њихова површинска енергија је била у опсегу од 17,7 до 24,9 mJ m-2. Овај рад истиче како би се променом састава у TPU NCs подешавала функционална својства и обезбедило додатно подешавање састава за дизајнирање напредних TPU NC материјала за специјалне биомедицинске примене.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Nanocomposites made from thermoplastic linear poly(urethane-siloxane) and organoclay: Composition impact on the properties
T1  - Нанокомпозити на бази термопластичног линеарног поли(уретан-силоксан)а и органоглине: утицај састава на својства
VL  - 87
IS  - 10
SP  - 1203
EP  - 1218
DO  - 10.2298/JSC220223036P
ER  - 

@article{
author = "Pergal, Marija and Ostojić, Sanja and Steinhart, Miloš and Stefanović, Ivan and Pezo, Lato and Spírková, Milena",
year = "2022",
abstract = "Thermoplastic poly(urethane-siloxane)/organoclay nanocomposites (TPU NCs) with different hard segment content (20–55 wt. %) were prepared by in situ polymerization in the presence of organically modified montmorillonite as a nanofiller (Cloisite 30B; 1 wt. %). Hydroxyl-terminated ethoxypropyl- poly(dimethylsiloxane) was used as soft segment, while 4,4'-methylenediphenyl diisocyanate and 1,4-butanediol were the hard segment components. The study of the influence of the hard segment content on the functional properties of TPU NCs was performed by Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometry (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), dynamic mechanical thermal analyses (DMTA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), water contact angle and water absorption tests. The results revealed that TPU NCs with the increasing hard segment content exhibit higher values of degree of microphase separation, melting temperature of the hard segments, degree of crystallinity, storage modulus (except for TPU NC-55), but lower thermal stability and hydrophobicity. TPU NC films were hydrophobic and their free surface energy was in the range from 17.7 to 24.9 mJ m-2. This work highlights how the composition of TPU NCs would affect their functional properties and provide an additional composition intended for designing advanced TPU NC materials for special biomedical applications., Термопластични поли(уретан-силоксан)/органоглина нанокомпозити (TPU NCs) са различитим садржајем тврдих сегмената (20–55 теж. %) припремљени су in situ полимеризацијом у присуству органски модификованог монтморилонита као нанопуниoца (Cloisite 30B; 1 теж. %). Као меки сегмент коришћен је хидроксиетоксипропил терминирани поли(диметилсилоксан), а као компоненте тврдог сегмента коршћени су 4,4'-  -метилендифенилдиизоцијанат и 1,4-бутандиол. Проучавање утицаја садржаја тврдог сегмента на функционална својства TPU NCs је испитивано FTIR спектроскопијом, дифракцијом X-зрака (XRD), микроскопијом атомских сила (AFM), скенирајућом електронском микроскопијом (SEM), динамичко механичко термичком анализом (DMTA), диференцијално скенирајућом калориметријом (DSC), термогравиметријском анализом (TGA), тестовима одређивања контактног угла са водом и апсорпције воде. Резултати су показали да TPU NCs са већим садржајем тврдих сегмената показују веће вредности степена микрофазне сепарације, температуре топљења тврдих сегмената, степена кристалиничности, модула сачуване енергије (осим за TPU NC-55), али нижу термичку стабилност и хидрофобност. TPU NC филмови су били хидрофобни и њихова површинска енергија је била у опсегу од 17,7 до 24,9 mJ m-2. Овај рад истиче како би се променом састава у TPU NCs подешавала функционална својства и обезбедило додатно подешавање састава за дизајнирање напредних TPU NC материјала за специјалне биомедицинске примене.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Nanocomposites made from thermoplastic linear poly(urethane-siloxane) and organoclay: Composition impact on the properties, Нанокомпозити на бази термопластичног линеарног поли(уретан-силоксан)а и органоглине: утицај састава на својства",
volume = "87",
number = "10",
pages = "1203-1218",
doi = "10.2298/JSC220223036P"
}

Pergal, M., Ostojić, S., Steinhart, M., Stefanović, I., Pezo, L.,& Spírková, M.. (2022). Nanocomposites made from thermoplastic linear poly(urethane-siloxane) and organoclay: Composition impact on the properties. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 87(10), 1203-1218.
https://doi.org/10.2298/JSC220223036P

Pergal M, Ostojić S, Steinhart M, Stefanović I, Pezo L, Spírková M. Nanocomposites made from thermoplastic linear poly(urethane-siloxane) and organoclay: Composition impact on the properties. in Journal of the Serbian Chemical Society. 2022;87(10):1203-1218.
doi:10.2298/JSC220223036P .

Pergal, Marija, Ostojić, Sanja, Steinhart, Miloš, Stefanović, Ivan, Pezo, Lato, Spírková, Milena, "Nanocomposites made from thermoplastic linear poly(urethane-siloxane) and organoclay: Composition impact on the properties" in Journal of the Serbian Chemical Society, 87, no. 10 (2022):1203-1218,
https://doi.org/10.2298/JSC220223036P . .