TY  - JOUR
AU  - Pagnacco, Maja
AU  - Maksimović, Jelena P.
AU  - Daković, Marko
AU  - Bokić, Bojana
AU  - Mouchet, Sébastien R.
AU  - Verbiest, Thierry
AU  - Caudano, Yves
AU  - Kolarić, Branko
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5600
AB  - In this work, we describe the crazy-clock phenomenon involving the state I (low iodide and iodine concentration) to state II (high iodide and iodine concentration with new iodine phase) transition after a Briggs–Rauscher (BR) oscillatory process. While the BR crazy-clock phenomenon is known, this is the first time that crazy-clock behavior is linked and explained with the symmetry-breaking phenomenon, highlighting the entire process in a novel way. The presented phenomenon has been thoroughly investigated by running more than 60 experiments, and evaluated by using statistical cluster K-means analysis. The mixing rate, as well as the magnetic bar shape and dimensions, have a strong influence on the transition appearance. Although the transition for both mixing and no-mixing conditions are taking place completely randomly, by using statistical cluster analysis we obtain different numbers of clusters (showing the time-domains where the transition is more likely to occur). In the case of stirring, clusters are more compact and separated, revealed new hidden details regarding the chemical dynamics of nonlinear processes. The significance of the presented results is beyond oscillatory reaction kinetics since the described example belongs to the small class of chemical systems that shows intrinsic randomness in their response and it might be considered as a real example of a classical liquid random number generator.
PB  - MDPI AG
T2  - Symmetry
T1  - Spontaneous Symmetry Breaking: The Case of Crazy Clock and Beyond
VL  - 14
IS  - 2
SP  - 413
DO  - 10.3390/sym14020413
ER  - 

@article{
author = "Pagnacco, Maja and Maksimović, Jelena P. and Daković, Marko and Bokić, Bojana and Mouchet, Sébastien R. and Verbiest, Thierry and Caudano, Yves and Kolarić, Branko",
year = "2022",
abstract = "In this work, we describe the crazy-clock phenomenon involving the state I (low iodide and iodine concentration) to state II (high iodide and iodine concentration with new iodine phase) transition after a Briggs–Rauscher (BR) oscillatory process. While the BR crazy-clock phenomenon is known, this is the first time that crazy-clock behavior is linked and explained with the symmetry-breaking phenomenon, highlighting the entire process in a novel way. The presented phenomenon has been thoroughly investigated by running more than 60 experiments, and evaluated by using statistical cluster K-means analysis. The mixing rate, as well as the magnetic bar shape and dimensions, have a strong influence on the transition appearance. Although the transition for both mixing and no-mixing conditions are taking place completely randomly, by using statistical cluster analysis we obtain different numbers of clusters (showing the time-domains where the transition is more likely to occur). In the case of stirring, clusters are more compact and separated, revealed new hidden details regarding the chemical dynamics of nonlinear processes. The significance of the presented results is beyond oscillatory reaction kinetics since the described example belongs to the small class of chemical systems that shows intrinsic randomness in their response and it might be considered as a real example of a classical liquid random number generator.",
publisher = "MDPI AG",
journal = "Symmetry",
title = "Spontaneous Symmetry Breaking: The Case of Crazy Clock and Beyond",
volume = "14",
number = "2",
pages = "413",
doi = "10.3390/sym14020413"
}

Pagnacco, M., Maksimović, J. P., Daković, M., Bokić, B., Mouchet, S. R., Verbiest, T., Caudano, Y.,& Kolarić, B.. (2022). Spontaneous Symmetry Breaking: The Case of Crazy Clock and Beyond. in Symmetry
MDPI AG., 14(2), 413.
https://doi.org/10.3390/sym14020413

Pagnacco M, Maksimović JP, Daković M, Bokić B, Mouchet SR, Verbiest T, Caudano Y, Kolarić B. Spontaneous Symmetry Breaking: The Case of Crazy Clock and Beyond. in Symmetry. 2022;14(2):413.
doi:10.3390/sym14020413 .

Pagnacco, Maja, Maksimović, Jelena P., Daković, Marko, Bokić, Bojana, Mouchet, Sébastien R., Verbiest, Thierry, Caudano, Yves, Kolarić, Branko, "Spontaneous Symmetry Breaking: The Case of Crazy Clock and Beyond" in Symmetry, 14, no. 2 (2022):413,
https://doi.org/10.3390/sym14020413 . .

TY  - JOUR
AU  - Maksimović, Tijana
AU  - Maksimović, Jelena P.
AU  - Tančić, Pavle
AU  - Potkonjak, Nebojša I.
AU  - Nedić, Zoran P.
AU  - Joksović, Ljubinka G.
AU  - Pagnacco, Maja
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4755
AB  - The calcium phosphate tungsten bronze (Ca-PWB) has been synthesized and characterized (TGA, DSC, XRPD, FTIR, SEM). The influence of solid insoluble materials Ca-PWB, as well as lithium doped (Li-PWB) and cation free phosphate tungsten (PWB) bronzes on the oscillatory Briggs-Rauscher (BR) reaction dynamics, is compared. The results show that doping with Li and Ca reduces sensitivity of the BR reaction towards bronzes addition. These findings suggest the usage of the BR reaction as an innovative method for testing of different properties of bronze material. The behavior of PWB in the BR reaction is significantly changed with divalent cation (Ca2+) doping. The reasons for the different bronzes behavior were found in their calculated unit cell volumes. Namely, the compressed Ca-PWB unit cell volume indicates the difficult availability of the active site for heterogeneous catalysis. Hence, the linear correlation (slope) of the BR oscillogram’s length (τosc) vs. mass of bronze in BR reaction might be considered as a new parameter for the evaluation of the bronzes catalytic activity.
AB  - У овом раду синтетисана је и окарактерисана (TGA, DSC, XRPD, FTIR, SEM) нова калцијумом допирана фосфат волфрамова бронза (Ca-PWB). Испитан је и упоређен утицај фосфат волфрамове бронзе (PWB), литијумом допиране фосфат волфрамове бронзе (Li-PWB) и калцијумом допиране фосфат волфрамове бронзе (Ca-PWB) на осцилаторну динамику Briggs-Rauscher (БР) реакције. Резултати показују да допирање катјонима Li+ и Ca2+ смањује осетљивост БР реакције на додатак нерастворних бронзи, што се огледа у смањивању нагиба праве осцилаторног времена (τosc) БР реакције у функцији масе додате допиране бронзе. Добијени резултати сугеришу употребу БР реакције као иновативне методе за испитивање различитих својстава допираних и недопиране фосфат волфрамове бронзе. Разлози за различито понашање бронзи у осцилаторној реакцији пронађени су у различитим величинама јединичних ћелија PWB, Li-PWB и Ca-PWB. Наиме, најмања вредност, тј. сабијање јединичне ћелије допирањем калицијумом указује на тежу доступност активних места за хетерогену катализу. Каталитичка активност бронзи усмерена је ка реакцијама оксидације које укључују водоник-пероксид (један од реактаната БР реакције). Стога би се линеарна корелација (нагиб) τosc у функцији масе бронзе у БР реакцији могла сматрати новим параметром за процену каталитичке активности бронзе, али и других материјала.
PB  - Belgrade : International Institute for the Science of Sintering (IISS)
T2  - Science of Sintering
T1  - A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response
VL  - 53
IS  - 2
SP  - 223
EP  - 235
DO  - 10.2298/SOS2102223M
ER  - 

@article{
author = "Maksimović, Tijana and Maksimović, Jelena P. and Tančić, Pavle and Potkonjak, Nebojša I. and Nedić, Zoran P. and Joksović, Ljubinka G. and Pagnacco, Maja",
year = "2021",
abstract = "The calcium phosphate tungsten bronze (Ca-PWB) has been synthesized and characterized (TGA, DSC, XRPD, FTIR, SEM). The influence of solid insoluble materials Ca-PWB, as well as lithium doped (Li-PWB) and cation free phosphate tungsten (PWB) bronzes on the oscillatory Briggs-Rauscher (BR) reaction dynamics, is compared. The results show that doping with Li and Ca reduces sensitivity of the BR reaction towards bronzes addition. These findings suggest the usage of the BR reaction as an innovative method for testing of different properties of bronze material. The behavior of PWB in the BR reaction is significantly changed with divalent cation (Ca2+) doping. The reasons for the different bronzes behavior were found in their calculated unit cell volumes. Namely, the compressed Ca-PWB unit cell volume indicates the difficult availability of the active site for heterogeneous catalysis. Hence, the linear correlation (slope) of the BR oscillogram’s length (τosc) vs. mass of bronze in BR reaction might be considered as a new parameter for the evaluation of the bronzes catalytic activity., У овом раду синтетисана је и окарактерисана (TGA, DSC, XRPD, FTIR, SEM) нова калцијумом допирана фосфат волфрамова бронза (Ca-PWB). Испитан је и упоређен утицај фосфат волфрамове бронзе (PWB), литијумом допиране фосфат волфрамове бронзе (Li-PWB) и калцијумом допиране фосфат волфрамове бронзе (Ca-PWB) на осцилаторну динамику Briggs-Rauscher (БР) реакције. Резултати показују да допирање катјонима Li+ и Ca2+ смањује осетљивост БР реакције на додатак нерастворних бронзи, што се огледа у смањивању нагиба праве осцилаторног времена (τosc) БР реакције у функцији масе додате допиране бронзе. Добијени резултати сугеришу употребу БР реакције као иновативне методе за испитивање различитих својстава допираних и недопиране фосфат волфрамове бронзе. Разлози за различито понашање бронзи у осцилаторној реакцији пронађени су у различитим величинама јединичних ћелија PWB, Li-PWB и Ca-PWB. Наиме, најмања вредност, тј. сабијање јединичне ћелије допирањем калицијумом указује на тежу доступност активних места за хетерогену катализу. Каталитичка активност бронзи усмерена је ка реакцијама оксидације које укључују водоник-пероксид (један од реактаната БР реакције). Стога би се линеарна корелација (нагиб) τosc у функцији масе бронзе у БР реакцији могла сматрати новим параметром за процену каталитичке активности бронзе, али и других материјала.",
publisher = "Belgrade : International Institute for the Science of Sintering (IISS)",
journal = "Science of Sintering",
title = "A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response",
volume = "53",
number = "2",
pages = "223-235",
doi = "10.2298/SOS2102223M"
}

Maksimović, T., Maksimović, J. P., Tančić, P., Potkonjak, N. I., Nedić, Z. P., Joksović, L. G.,& Pagnacco, M.. (2021). A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response. in Science of Sintering
Belgrade : International Institute for the Science of Sintering (IISS)., 53(2), 223-235.
https://doi.org/10.2298/SOS2102223M

Maksimović T, Maksimović JP, Tančić P, Potkonjak NI, Nedić ZP, Joksović LG, Pagnacco M. A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response. in Science of Sintering. 2021;53(2):223-235.
doi:10.2298/SOS2102223M .

Maksimović, Tijana, Maksimović, Jelena P., Tančić, Pavle, Potkonjak, Nebojša I., Nedić, Zoran P., Joksović, Ljubinka G., Pagnacco, Maja, "A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response" in Science of Sintering, 53, no. 2 (2021):223-235,
https://doi.org/10.2298/SOS2102223M . .