TY  - THES
AU  - Ilić-Pajić, Jovana
PY  - 2021
UR  - https://uvidok.rcub.bg.ac.rs/bitstream/handle/123456789/4163/Referat.pdf
UR  - https://eteze.bg.ac.rs/application/showtheses?thesesId=8736
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:26318/bdef:Content/download
UR  - https://plus.cobiss.net/cobiss/sr/sr/bib/70923785
UR  - https://nardus.mpn.gov.rs/handle/123456789/20629
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5318
AB  - Kontinualni razvoj vazdušnog saobraćaja na svetskom nivou uslovljava veću potrošnju energije, što vodi do povećanja štetnog uticaja na životnu sredinu. U cilju smanjenja negativnog uticaja fosilnih goriva na životnu sredinu, raste interesovanje za primenom bioobnovljivih izvora energije. Alternativna biogoriva, tj. njihova implementacija predstavlja sve interesantniji izazov avio industrije u cilju odgovora na zahtev za smanjenje emisije štetnih gasova.Predmet istraživanja ove doktorske disertacije podrazumeva određivanje volumetrijskih i termodinamičkih karakteristika terpena. Termodinamičke karakteristike terpena na visokim pritiscima i različitim temperaturama su od izuzetnog značaja za efikasno funkcionisanje motora. Eksperimentalno su merene gustine čistih uzoraka četiri različita terpena (p-cimen, α-pinen, limonen i citral) na pritiscima p═(0,1-60) MPa i temperaturama T═(293,15-413,15) K. Dobijene eksperimentalne vrednosti gustina na visokim pritiscima modelovane su modifikovanom Tammann-Tait-ovom jednačinom i dalje korišćene za proračune koeficijenata izotermskog sabijanja i izobarskog toplotnog širenja, unutrašnjeg pritiska i razlike specifičnih toplotnih kapaciteta pri konstantnoj zapremini i konstantnom pritisku. Imajući u vidu da je za modelovanje volumetrijskih karakteristika pomoću kubnih jednačina stanja neophodno poznavanje kritičnih osobina, koje je veoma komplikovano odrediti za većinu biokomponenti, razvijene su SAFT i PC-SAFT jednačine. Modeli jednačina stanja, SAFT i PC-SAFT korišćeni su za korelaciju konačnih gustina na visokim pritiscima. Odabrani terpeni su pojedinačno okarakterisani sa pet parametara karakterističnih za svaki od pomenutih modela (broj segmenta, energija segmenta, prečnik segmenta, zapremina asocijacije i energija asocijacije). Rezultati su prikazani grafički i tabelarno, i pokazuju veoma dobro slaganje sa eksperimentalnim podacima.Volumetrijska i transportna svojstva (gustine, viskoznosti, indeksi refrakcije i brzine zvuka) čistih terpena kao i njihovih binarnih smeša (p-cimen+α-pinen; p-cimen+limonen; p-cimen+citral) određena su eksperimentalnim merenjem u temperaturnom opsegu (288,15-323,15) K i na atmosferskom pritisku . Na osnovu izmerenih vrednosti proračunate su dopunske zapremine, promene viskoznosti, promene izentropske kompresibilnosti i dopunske slobodne Gibs-ove energije aktivacije viskoznog toka i rezultati fitovani Redlich-Kister polinomom. Kako bi se objasnilo neidealno ponašanje smeša izračunate su i parcijalne molarne zapremine, dopunske parcijalne molarne zapremine, dopunske parcijalne molarne zapremine pri beskonačnim razblaženjima.Istraživanja urađena u ovoj doktorskoj disertaciji predstavljaju vrednu bazu eksperimentalnih podataka potencijalno važnih biogoriva. Izračunati termofizički, termodinamički i mehanički parametri čistih terpena i njihovih binarnih smeša pružaju dragocene informacije o njihovom ponašanju u uslovima povišenih pritisaka i temperatura. Detaljna analiza molekulskih interakcija na osnovu dobijenih parametra daje uvid u neidealno ponašanje odabranih sistema
AB  - Continuous development of air transport at the world level causes higher energy consumption, which leads to an increase in the environmental impact. In order to reduce the negative impact of fossil fuels on the environment, there is increasing interest in the use of bio-renewable energy sources. Alternative biofuels, i.e. their implementation represents an increasingly interesting challenge for the aviation industry to respond to the requirement to reduce greenhouse gas emissions. Naturally occurring terpenes in plants can potentially be used as additives to existing fuels.The subject of this doctoral dissertation involves determining the volumetric and thermodynamic characteristics of terpenes. The thermodynamic characteristics of the terpenes at high pressures and at different temperatures are of great importance for the efficient operation of the engine. The densities of pure samples of four different terpenes (p-cymene, α-pinene, limonene and citral) were experimentally measured at pressures p═ (0.1-60) MPa and temperatures T═ (293.15-413.15) K. The obtained experimental values of high-pressure densities were modeled by the modified Tammann-Tait equation and further used to calculate isothermal compressibility and isobaric thermal expansivity coefficients, internal pressure, and the difference of specific heat capacities at constant pressure and at constant volume. Bearing in mind that knowledge of critical properties, which is very complicated to determine for most biocomponents, requires the development of volumetric characteristics using cubic state equations, SAFT and PC-SAFT equations have been developed. State equation models, SAFT, and PC-SAFT were used to correlate finite densities at high pressures. The selected terpenes were individually characterized by five parameters characteristic of each of the mentioned models (number of segments, segment energy, segment diameter, association volume and association energy). The results are presented graphically and in tabular form, and show very good agreement with the experimental data.Volumetric and transport properties of of pure terpenes as well as their binary mixtures (p-cymen + α-pinene; p-cymen + limonene; p-cymen + citral) were determined in the temperature range (288.15-323.15) K and at atmospheric pressure. Based on the measured values, the additional volumes, viscosity changes, changes in isentropic compressibility, and the additional free Gibbs energy of activation of the viscous flow were calculated and the results fit with the Redlich-Kister polynomial. In order to explain the non-ideal behavior of mixtures, partial molar volumes, additional partial molar volumes, supplemental partial molar volumes at infinite dilutions were also calculated. The research done in this doctoral dissertation represents a valuable database of experimental data on potentially important biofuels. The calculated thermophysical, thermodynamic and mechanical properties of pure terpenes and their binary mixtures provide valuable information about their behavior under high-pressure and high-temperature conditions. A comprehensive analysis of molecular interactions based on the obtained properties provides insight into the non-ideal behavior of selected systems.
PB  - Универзитет у Београду, Технолошко-металуршки факултет
T2  - Универзитет у Београду
T1  - Eksperimentalno određivanje volumetrijskih karakteristika biogoriva na visokom pritisku i njihovo modelovanje korišćenjem SAFT i PC-SAFT modela
UR  - https://hdl.handle.net/21.15107/rcub_nardus_20629
ER  - 

@phdthesis{
author = "Ilić-Pajić, Jovana",
year = "2021",
abstract = "Kontinualni razvoj vazdušnog saobraćaja na svetskom nivou uslovljava veću potrošnju energije, što vodi do povećanja štetnog uticaja na životnu sredinu. U cilju smanjenja negativnog uticaja fosilnih goriva na životnu sredinu, raste interesovanje za primenom bioobnovljivih izvora energije. Alternativna biogoriva, tj. njihova implementacija predstavlja sve interesantniji izazov avio industrije u cilju odgovora na zahtev za smanjenje emisije štetnih gasova.Predmet istraživanja ove doktorske disertacije podrazumeva određivanje volumetrijskih i termodinamičkih karakteristika terpena. Termodinamičke karakteristike terpena na visokim pritiscima i različitim temperaturama su od izuzetnog značaja za efikasno funkcionisanje motora. Eksperimentalno su merene gustine čistih uzoraka četiri različita terpena (p-cimen, α-pinen, limonen i citral) na pritiscima p═(0,1-60) MPa i temperaturama T═(293,15-413,15) K. Dobijene eksperimentalne vrednosti gustina na visokim pritiscima modelovane su modifikovanom Tammann-Tait-ovom jednačinom i dalje korišćene za proračune koeficijenata izotermskog sabijanja i izobarskog toplotnog širenja, unutrašnjeg pritiska i razlike specifičnih toplotnih kapaciteta pri konstantnoj zapremini i konstantnom pritisku. Imajući u vidu da je za modelovanje volumetrijskih karakteristika pomoću kubnih jednačina stanja neophodno poznavanje kritičnih osobina, koje je veoma komplikovano odrediti za većinu biokomponenti, razvijene su SAFT i PC-SAFT jednačine. Modeli jednačina stanja, SAFT i PC-SAFT korišćeni su za korelaciju konačnih gustina na visokim pritiscima. Odabrani terpeni su pojedinačno okarakterisani sa pet parametara karakterističnih za svaki od pomenutih modela (broj segmenta, energija segmenta, prečnik segmenta, zapremina asocijacije i energija asocijacije). Rezultati su prikazani grafički i tabelarno, i pokazuju veoma dobro slaganje sa eksperimentalnim podacima.Volumetrijska i transportna svojstva (gustine, viskoznosti, indeksi refrakcije i brzine zvuka) čistih terpena kao i njihovih binarnih smeša (p-cimen+α-pinen; p-cimen+limonen; p-cimen+citral) određena su eksperimentalnim merenjem u temperaturnom opsegu (288,15-323,15) K i na atmosferskom pritisku . Na osnovu izmerenih vrednosti proračunate su dopunske zapremine, promene viskoznosti, promene izentropske kompresibilnosti i dopunske slobodne Gibs-ove energije aktivacije viskoznog toka i rezultati fitovani Redlich-Kister polinomom. Kako bi se objasnilo neidealno ponašanje smeša izračunate su i parcijalne molarne zapremine, dopunske parcijalne molarne zapremine, dopunske parcijalne molarne zapremine pri beskonačnim razblaženjima.Istraživanja urađena u ovoj doktorskoj disertaciji predstavljaju vrednu bazu eksperimentalnih podataka potencijalno važnih biogoriva. Izračunati termofizički, termodinamički i mehanički parametri čistih terpena i njihovih binarnih smeša pružaju dragocene informacije o njihovom ponašanju u uslovima povišenih pritisaka i temperatura. Detaljna analiza molekulskih interakcija na osnovu dobijenih parametra daje uvid u neidealno ponašanje odabranih sistema, Continuous development of air transport at the world level causes higher energy consumption, which leads to an increase in the environmental impact. In order to reduce the negative impact of fossil fuels on the environment, there is increasing interest in the use of bio-renewable energy sources. Alternative biofuels, i.e. their implementation represents an increasingly interesting challenge for the aviation industry to respond to the requirement to reduce greenhouse gas emissions. Naturally occurring terpenes in plants can potentially be used as additives to existing fuels.The subject of this doctoral dissertation involves determining the volumetric and thermodynamic characteristics of terpenes. The thermodynamic characteristics of the terpenes at high pressures and at different temperatures are of great importance for the efficient operation of the engine. The densities of pure samples of four different terpenes (p-cymene, α-pinene, limonene and citral) were experimentally measured at pressures p═ (0.1-60) MPa and temperatures T═ (293.15-413.15) K. The obtained experimental values of high-pressure densities were modeled by the modified Tammann-Tait equation and further used to calculate isothermal compressibility and isobaric thermal expansivity coefficients, internal pressure, and the difference of specific heat capacities at constant pressure and at constant volume. Bearing in mind that knowledge of critical properties, which is very complicated to determine for most biocomponents, requires the development of volumetric characteristics using cubic state equations, SAFT and PC-SAFT equations have been developed. State equation models, SAFT, and PC-SAFT were used to correlate finite densities at high pressures. The selected terpenes were individually characterized by five parameters characteristic of each of the mentioned models (number of segments, segment energy, segment diameter, association volume and association energy). The results are presented graphically and in tabular form, and show very good agreement with the experimental data.Volumetric and transport properties of of pure terpenes as well as their binary mixtures (p-cymen + α-pinene; p-cymen + limonene; p-cymen + citral) were determined in the temperature range (288.15-323.15) K and at atmospheric pressure. Based on the measured values, the additional volumes, viscosity changes, changes in isentropic compressibility, and the additional free Gibbs energy of activation of the viscous flow were calculated and the results fit with the Redlich-Kister polynomial. In order to explain the non-ideal behavior of mixtures, partial molar volumes, additional partial molar volumes, supplemental partial molar volumes at infinite dilutions were also calculated. The research done in this doctoral dissertation represents a valuable database of experimental data on potentially important biofuels. The calculated thermophysical, thermodynamic and mechanical properties of pure terpenes and their binary mixtures provide valuable information about their behavior under high-pressure and high-temperature conditions. A comprehensive analysis of molecular interactions based on the obtained properties provides insight into the non-ideal behavior of selected systems.",
publisher = "Универзитет у Београду, Технолошко-металуршки факултет",
journal = "Универзитет у Београду",
title = "Eksperimentalno određivanje volumetrijskih karakteristika biogoriva na visokom pritisku i njihovo modelovanje korišćenjem SAFT i PC-SAFT modela",
url = "https://hdl.handle.net/21.15107/rcub_nardus_20629"
}

Ilić-Pajić, J.. (2021). Eksperimentalno određivanje volumetrijskih karakteristika biogoriva na visokom pritisku i njihovo modelovanje korišćenjem SAFT i PC-SAFT modela. in Универзитет у Београду
Универзитет у Београду, Технолошко-металуршки факултет..
https://hdl.handle.net/21.15107/rcub_nardus_20629

Ilić-Pajić J. Eksperimentalno određivanje volumetrijskih karakteristika biogoriva na visokom pritisku i njihovo modelovanje korišćenjem SAFT i PC-SAFT modela. in Универзитет у Београду. 2021;.
https://hdl.handle.net/21.15107/rcub_nardus_20629 .

Ilić-Pajić, Jovana, "Eksperimentalno određivanje volumetrijskih karakteristika biogoriva na visokom pritisku i njihovo modelovanje korišćenjem SAFT i PC-SAFT modela" in Универзитет у Београду (2021),
https://hdl.handle.net/21.15107/rcub_nardus_20629 .

TY  - JOUR
AU  - Ilić-Pajić, Jovana
AU  - Ivaniš, Gorica
AU  - Radović, Ivona
AU  - Grujić, Aleksandar
AU  - Stajić-Trošić, Jasna
AU  - Stijepović, Mirko Z.
AU  - Kijevčanin, Mirjana
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3784
AB  - In order to reduce negative influence of fossil fuels on environment, use of various renewable resources is highly promoted. Terpenes, naturally occurring in plants, can be added to petroleum fuel as its substitute up to a certain share. Thermodynamic properties of a fuel under high pressure and moderate temperature conditions are of significant importance for engine efficiency. This work reports density measurements of pure p-cymene, α-pinene, limonene and citral at temperatures (293.15–413.15) K and pressures (0.1–60) MPa, applying an Anton Paar DMA HP measuring cell. Density data were fitted by modified Tammann-Tait equation where the absolute average percentage deviation between measured and calculated densities was about 0.010%. The obtained parameters were used to estimate the isothermal compressibility, the isobaric thermal expansion coefficient, the internal pressure, and the difference between specific heat capacity at constant pressure and at constant volume. For examined compounds, all thermodynamic properties, except the internal pressure, decrease with pressure rise along an isotherm and increase as temperature increases at a constant pressure. The intersection point of isotherms for the isobaric thermal expansion coefficient for pure citral was registered at pressure 47 MPa, while for other analyzed terpenes the intersection point is above 60 MPa, outside the measurements pressure range.
PB  - Elsevier
T2  - The Journal of Chemical Thermodynamics
T1  - Experimental densities and derived thermodynamic properties of pure p-cymene, α-pinene, limonene and citral under high pressure conditions
VL  - 144
SP  - 106065
DO  - 10.1016/j.jct.2020.106065
ER  - 

@article{
author = "Ilić-Pajić, Jovana and Ivaniš, Gorica and Radović, Ivona and Grujić, Aleksandar and Stajić-Trošić, Jasna and Stijepović, Mirko Z. and Kijevčanin, Mirjana",
year = "2020",
abstract = "In order to reduce negative influence of fossil fuels on environment, use of various renewable resources is highly promoted. Terpenes, naturally occurring in plants, can be added to petroleum fuel as its substitute up to a certain share. Thermodynamic properties of a fuel under high pressure and moderate temperature conditions are of significant importance for engine efficiency. This work reports density measurements of pure p-cymene, α-pinene, limonene and citral at temperatures (293.15–413.15) K and pressures (0.1–60) MPa, applying an Anton Paar DMA HP measuring cell. Density data were fitted by modified Tammann-Tait equation where the absolute average percentage deviation between measured and calculated densities was about 0.010%. The obtained parameters were used to estimate the isothermal compressibility, the isobaric thermal expansion coefficient, the internal pressure, and the difference between specific heat capacity at constant pressure and at constant volume. For examined compounds, all thermodynamic properties, except the internal pressure, decrease with pressure rise along an isotherm and increase as temperature increases at a constant pressure. The intersection point of isotherms for the isobaric thermal expansion coefficient for pure citral was registered at pressure 47 MPa, while for other analyzed terpenes the intersection point is above 60 MPa, outside the measurements pressure range.",
publisher = "Elsevier",
journal = "The Journal of Chemical Thermodynamics",
title = "Experimental densities and derived thermodynamic properties of pure p-cymene, α-pinene, limonene and citral under high pressure conditions",
volume = "144",
pages = "106065",
doi = "10.1016/j.jct.2020.106065"
}

Ilić-Pajić, J., Ivaniš, G., Radović, I., Grujić, A., Stajić-Trošić, J., Stijepović, M. Z.,& Kijevčanin, M.. (2020). Experimental densities and derived thermodynamic properties of pure p-cymene, α-pinene, limonene and citral under high pressure conditions. in The Journal of Chemical Thermodynamics
Elsevier., 144, 106065.
https://doi.org/10.1016/j.jct.2020.106065

Ilić-Pajić J, Ivaniš G, Radović I, Grujić A, Stajić-Trošić J, Stijepović MZ, Kijevčanin M. Experimental densities and derived thermodynamic properties of pure p-cymene, α-pinene, limonene and citral under high pressure conditions. in The Journal of Chemical Thermodynamics. 2020;144:106065.
doi:10.1016/j.jct.2020.106065 .

Ilić-Pajić, Jovana, Ivaniš, Gorica, Radović, Ivona, Grujić, Aleksandar, Stajić-Trošić, Jasna, Stijepović, Mirko Z., Kijevčanin, Mirjana, "Experimental densities and derived thermodynamic properties of pure p-cymene, α-pinene, limonene and citral under high pressure conditions" in The Journal of Chemical Thermodynamics, 144 (2020):106065,
https://doi.org/10.1016/j.jct.2020.106065 . .

TY  - JOUR
AU  - Ilić-Pajić, Jovana
AU  - Stijepović, Mirko Z.
AU  - Ivaniš, Gorica
AU  - Radović, Ivona
AU  - Stajić-Trošić, Jasna
AU  - Kijevčanin, Mirjana
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2334
AB  - SAFT equations of state have been widely used for the determination of different thermo-physical and phase equilibria properties. In order to use these equations as predictive models it is necessary to calculate the model parameters. In this work CK-SAFT and PC-SAFT equations of state were applied for the correlation of pure compounds densities in the wide ranges of temperature and pressure (288.15-413.15 K and 0.1-60 MPa, respectively). The calculations of densities for n-hexane, n-heptane, n-octane, toluene, dichloromethane and ethanol, under high pressure conditions, were performed with the new sets of parameters determined in this paper by CK-SAFT and PC-SAFT. Very good agreement between experimental and calculated density values was achieved, having absolute average percentage deviations lower than 0.5 %.
AB  - SAFT једначине стања се веома често користе за одређивање различитих термофизичких својстава, као и у описивању различитих равнотежа фаза. Да би се ови модели могли користити у предвиђању термодинамичких величина неопходно је претходно одредити параметре модела. У овом раду су коришћене CK-SAFT и PC-SAFT једначине
стања за одређивање густина чистих компонената у широком опсегу температура и притисака (288,15–413,15 K, односно 0,1–60 MPa). Прорачун густина n-хексана, n-хептана,
n-октана, толуена, дихлорметана и етанола је извршен на високим притисцима са сетовима параметара одређених у овом раду помоћу наведених CK-SAFT и PC-SAFT модела. 
Коришћењем добијених параметара постигнути су веома добри резултати са апсолутним средњим процентуалним грешкама мањим од 0,5 %.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Modelling of pure components high pressures densities using CK-SAFT and PC-SAFT equations
T1  - Моделовање густина чистих компонената на високим притисцима применом ck-saft и pc-saft једначина стања
VL  - 83
IS  - 3
SP  - 331
EP  - 343
DO  - 10.2298/JSC170613096P
ER  - 

@article{
author = "Ilić-Pajić, Jovana and Stijepović, Mirko Z. and Ivaniš, Gorica and Radović, Ivona and Stajić-Trošić, Jasna and Kijevčanin, Mirjana",
year = "2018",
abstract = "SAFT equations of state have been widely used for the determination of different thermo-physical and phase equilibria properties. In order to use these equations as predictive models it is necessary to calculate the model parameters. In this work CK-SAFT and PC-SAFT equations of state were applied for the correlation of pure compounds densities in the wide ranges of temperature and pressure (288.15-413.15 K and 0.1-60 MPa, respectively). The calculations of densities for n-hexane, n-heptane, n-octane, toluene, dichloromethane and ethanol, under high pressure conditions, were performed with the new sets of parameters determined in this paper by CK-SAFT and PC-SAFT. Very good agreement between experimental and calculated density values was achieved, having absolute average percentage deviations lower than 0.5 %., SAFT једначине стања се веома често користе за одређивање различитих термофизичких својстава, као и у описивању различитих равнотежа фаза. Да би се ови модели могли користити у предвиђању термодинамичких величина неопходно је претходно одредити параметре модела. У овом раду су коришћене CK-SAFT и PC-SAFT једначине
стања за одређивање густина чистих компонената у широком опсегу температура и притисака (288,15–413,15 K, односно 0,1–60 MPa). Прорачун густина n-хексана, n-хептана,
n-октана, толуена, дихлорметана и етанола је извршен на високим притисцима са сетовима параметара одређених у овом раду помоћу наведених CK-SAFT и PC-SAFT модела. 
Коришћењем добијених параметара постигнути су веома добри резултати са апсолутним средњим процентуалним грешкама мањим од 0,5 %.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Modelling of pure components high pressures densities using CK-SAFT and PC-SAFT equations, Моделовање густина чистих компонената на високим притисцима применом ck-saft и pc-saft једначина стања",
volume = "83",
number = "3",
pages = "331-343",
doi = "10.2298/JSC170613096P"
}

Ilić-Pajić, J., Stijepović, M. Z., Ivaniš, G., Radović, I., Stajić-Trošić, J.,& Kijevčanin, M.. (2018). Modelling of pure components high pressures densities using CK-SAFT and PC-SAFT equations. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 83(3), 331-343.
https://doi.org/10.2298/JSC170613096P

Ilić-Pajić J, Stijepović MZ, Ivaniš G, Radović I, Stajić-Trošić J, Kijevčanin M. Modelling of pure components high pressures densities using CK-SAFT and PC-SAFT equations. in Journal of the Serbian Chemical Society. 2018;83(3):331-343.
doi:10.2298/JSC170613096P .

Ilić-Pajić, Jovana, Stijepović, Mirko Z., Ivaniš, Gorica, Radović, Ivona, Stajić-Trošić, Jasna, Kijevčanin, Mirjana, "Modelling of pure components high pressures densities using CK-SAFT and PC-SAFT equations" in Journal of the Serbian Chemical Society, 83, no. 3 (2018):331-343,
https://doi.org/10.2298/JSC170613096P . .

TY  - JOUR
AU  - Ilić-Pajić, Jovana
AU  - Grujić, Aleksandar
AU  - Stijepović, Mirko Z.
AU  - Stajić-Trošić, Jasna
AU  - Bugarski, Branko
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1695
AB  - The aim of this paper is to obtain microbeads of natural polymers such as alginate and chitosan. These microbeads were used as potential carriers for the active ingredients so that in this study the diffusion of various substances from them is analyzed. Alginate microbeads were obtained by electrostatic droplet method. In the resulting microbeads was performed absorption of three tracer indicators with different molecular weight (acridine orange, blue dextran, methylene blue). The goal of the experiment is to monitor indicators release kinetics from microbeads. Based on these measurements the layoffs curve should give an answer on the impact of the molecular size of the three indicators on the diffusion rate of microbeads. In order to achieve the slow release of indicators alginate microbeads were coated with chitosan. Chitosan has an impact on reducing the porosity of gel, which further led to lower release tracer indicators of microbeads. Comparative analysis of the obtained layoffs curves answers about the impact on the process of obtaining micro diffusion rate indicator.
AB  - U ovom radu je prikazan proces sinteze mikročestica od prirodnih polimera, alginata i hitozana, kao i neka njihova svojstva. Osnovna primena ovih mikročestica je da se koriste kao potencijalni nosači za aktivne supstance. U tom smislu je ispitivana i difuzija različitih supstanci iz njih. Na alginatne mikročestice dobijene metodom elektrostatičke ekstruzije vršena je apsorpcija tri trejserska indikatora sa različitim molekulskim masama: akridin oranž, plavi dekstran i metilensko plavo. Praćenjem kinetike otpuštanja indikatora iz mikročestica konstruisane su krive otpuštanja koje daju informaciju o uticaju veličine molekula svakog od indikatora na brzinu difuzije iz mikročestica. Da bi se postiglo što sporije otpuštanje indikatora alginatne mikročestice su oblagane hitozanom. Hitozan ima uticaj na smanjenje poroznosti gela, što dovodi do sporijeg otpuštanja trejsersikh indikatora iz mikročestica. Uporedna analiza dobijenih krivih otpuštanja daje odgovor o uticaju postupka dobijanja mikročestica na brzinu difuzije indikatora.
PB  - Savez inženjera i tehničara Srbije
T2  - Tehnika
T1  - Effect of tracers molecular weight on the release process from alginate microbeads
T1  - Uticaj molekulske mase trejserskih indikatora na kontrolisano otpuštanje iz alginatnih mikročestica
VL  - 70
IS  - 3
SP  - 401
EP  - 405
DO  - 10.5937/tehnika1503401I
ER  - 

@article{
author = "Ilić-Pajić, Jovana and Grujić, Aleksandar and Stijepović, Mirko Z. and Stajić-Trošić, Jasna and Bugarski, Branko",
year = "2015",
abstract = "The aim of this paper is to obtain microbeads of natural polymers such as alginate and chitosan. These microbeads were used as potential carriers for the active ingredients so that in this study the diffusion of various substances from them is analyzed. Alginate microbeads were obtained by electrostatic droplet method. In the resulting microbeads was performed absorption of three tracer indicators with different molecular weight (acridine orange, blue dextran, methylene blue). The goal of the experiment is to monitor indicators release kinetics from microbeads. Based on these measurements the layoffs curve should give an answer on the impact of the molecular size of the three indicators on the diffusion rate of microbeads. In order to achieve the slow release of indicators alginate microbeads were coated with chitosan. Chitosan has an impact on reducing the porosity of gel, which further led to lower release tracer indicators of microbeads. Comparative analysis of the obtained layoffs curves answers about the impact on the process of obtaining micro diffusion rate indicator., U ovom radu je prikazan proces sinteze mikročestica od prirodnih polimera, alginata i hitozana, kao i neka njihova svojstva. Osnovna primena ovih mikročestica je da se koriste kao potencijalni nosači za aktivne supstance. U tom smislu je ispitivana i difuzija različitih supstanci iz njih. Na alginatne mikročestice dobijene metodom elektrostatičke ekstruzije vršena je apsorpcija tri trejserska indikatora sa različitim molekulskim masama: akridin oranž, plavi dekstran i metilensko plavo. Praćenjem kinetike otpuštanja indikatora iz mikročestica konstruisane su krive otpuštanja koje daju informaciju o uticaju veličine molekula svakog od indikatora na brzinu difuzije iz mikročestica. Da bi se postiglo što sporije otpuštanje indikatora alginatne mikročestice su oblagane hitozanom. Hitozan ima uticaj na smanjenje poroznosti gela, što dovodi do sporijeg otpuštanja trejsersikh indikatora iz mikročestica. Uporedna analiza dobijenih krivih otpuštanja daje odgovor o uticaju postupka dobijanja mikročestica na brzinu difuzije indikatora.",
publisher = "Savez inženjera i tehničara Srbije",
journal = "Tehnika",
title = "Effect of tracers molecular weight on the release process from alginate microbeads, Uticaj molekulske mase trejserskih indikatora na kontrolisano otpuštanje iz alginatnih mikročestica",
volume = "70",
number = "3",
pages = "401-405",
doi = "10.5937/tehnika1503401I"
}

Ilić-Pajić, J., Grujić, A., Stijepović, M. Z., Stajić-Trošić, J.,& Bugarski, B.. (2015). Effect of tracers molecular weight on the release process from alginate microbeads. in Tehnika
Savez inženjera i tehničara Srbije., 70(3), 401-405.
https://doi.org/10.5937/tehnika1503401I

Ilić-Pajić J, Grujić A, Stijepović MZ, Stajić-Trošić J, Bugarski B. Effect of tracers molecular weight on the release process from alginate microbeads. in Tehnika. 2015;70(3):401-405.
doi:10.5937/tehnika1503401I .

Ilić-Pajić, Jovana, Grujić, Aleksandar, Stijepović, Mirko Z., Stajić-Trošić, Jasna, Bugarski, Branko, "Effect of tracers molecular weight on the release process from alginate microbeads" in Tehnika, 70, no. 3 (2015):401-405,
https://doi.org/10.5937/tehnika1503401I . .

TY  - JOUR
AU  - Todorović, Tamara
AU  - Rychlewska, Urszula
AU  - Warzajtis, B.
AU  - Radanović, Dušanka
AU  - Filipović, N.R.
AU  - Ilić-Pajić, Jovana
AU  - Sladić, Dušan
AU  - Anđelković, Katarina
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/577
AB  - The bimetallic [Ni2(H2L2)2](ClO4)4 (1), [Ni2(HL2)(H2L2)](ClO4)3 (2) and [Zn2(H2L2)2](BF4) 4 (3) complexes (H2L2 = N′,N′2-bis[(1E)-1-(2-pyridyl)ethylidene]propanedi hydrazide) were synthesized and characterized. The structure of complexes (1) and (2) was established by X-ray analysis. NMR spectroscopy was used for the characterization of complex (3). The complexes (1) and (2) were obtained from the same synthetic reaction and two crystal types of these complexes have been isolated during the fractional crystallization process. In complex (1) each Ni(II) ion is coordinated with two NNO donor atom sets from two H2L2 ligands forming an octahedral geometry. Similarly, in complex (2) the octahedral geometry of each Ni(II) ion is attained by coordination of two NNO donor atom sets, one from the neutral and the other from the monoanionic form of the ligand. The antimicrobial activity of the ligand and complexes is also presented.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Polyhedron
T1  - Synthesis, characterization and antimicrobial activity of Ni(II) and Zn(II) complexes with N′,N′2-bis[(1E)-1-(2-pyridyl)ethylidene]propanedi hydrazide. Crystal structures of two highly solvated bimetallic complexes of Ni(II)
VL  - 28
IS  - 12
SP  - 2397
EP  - 2402
DO  - 10.1016/j.poly.2009.05.002
ER  - 

@article{
author = "Todorović, Tamara and Rychlewska, Urszula and Warzajtis, B. and Radanović, Dušanka and Filipović, N.R. and Ilić-Pajić, Jovana and Sladić, Dušan and Anđelković, Katarina",
year = "2009",
abstract = "The bimetallic [Ni2(H2L2)2](ClO4)4 (1), [Ni2(HL2)(H2L2)](ClO4)3 (2) and [Zn2(H2L2)2](BF4) 4 (3) complexes (H2L2 = N′,N′2-bis[(1E)-1-(2-pyridyl)ethylidene]propanedi hydrazide) were synthesized and characterized. The structure of complexes (1) and (2) was established by X-ray analysis. NMR spectroscopy was used for the characterization of complex (3). The complexes (1) and (2) were obtained from the same synthetic reaction and two crystal types of these complexes have been isolated during the fractional crystallization process. In complex (1) each Ni(II) ion is coordinated with two NNO donor atom sets from two H2L2 ligands forming an octahedral geometry. Similarly, in complex (2) the octahedral geometry of each Ni(II) ion is attained by coordination of two NNO donor atom sets, one from the neutral and the other from the monoanionic form of the ligand. The antimicrobial activity of the ligand and complexes is also presented.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Polyhedron",
title = "Synthesis, characterization and antimicrobial activity of Ni(II) and Zn(II) complexes with N′,N′2-bis[(1E)-1-(2-pyridyl)ethylidene]propanedi hydrazide. Crystal structures of two highly solvated bimetallic complexes of Ni(II)",
volume = "28",
number = "12",
pages = "2397-2402",
doi = "10.1016/j.poly.2009.05.002"
}

Todorović, T., Rychlewska, U., Warzajtis, B., Radanović, D., Filipović, N.R., Ilić-Pajić, J., Sladić, D.,& Anđelković, K.. (2009). Synthesis, characterization and antimicrobial activity of Ni(II) and Zn(II) complexes with N′,N′2-bis[(1E)-1-(2-pyridyl)ethylidene]propanedi hydrazide. Crystal structures of two highly solvated bimetallic complexes of Ni(II). in Polyhedron
Oxford : Pergamon-Elsevier Science Ltd., 28(12), 2397-2402.
https://doi.org/10.1016/j.poly.2009.05.002

Todorović T, Rychlewska U, Warzajtis B, Radanović D, Filipović N, Ilić-Pajić J, Sladić D, Anđelković K. Synthesis, characterization and antimicrobial activity of Ni(II) and Zn(II) complexes with N′,N′2-bis[(1E)-1-(2-pyridyl)ethylidene]propanedi hydrazide. Crystal structures of two highly solvated bimetallic complexes of Ni(II). in Polyhedron. 2009;28(12):2397-2402.
doi:10.1016/j.poly.2009.05.002 .

Todorović, Tamara, Rychlewska, Urszula, Warzajtis, B., Radanović, Dušanka, Filipović, N.R., Ilić-Pajić, Jovana, Sladić, Dušan, Anđelković, Katarina, "Synthesis, characterization and antimicrobial activity of Ni(II) and Zn(II) complexes with N′,N′2-bis[(1E)-1-(2-pyridyl)ethylidene]propanedi hydrazide. Crystal structures of two highly solvated bimetallic complexes of Ni(II)" in Polyhedron, 28, no. 12 (2009):2397-2402,
https://doi.org/10.1016/j.poly.2009.05.002 . .