TY  - JOUR
AU  - Smiljanić, Sonja
AU  - Karamanova, Emilia
AU  - Grujić, Snežana
AU  - Rogan, Jelena
AU  - Stojanović, Jovica
AU  - Matijašević, Srđan
AU  - Karamanov, Alexander
PY  - 2018
UR  - https://ritnms.itnms.ac.rs/handle/123456789/474
AB  - The peculiarities of sinter-crystallization of La2O3 center dot SrO center dot 5B(2)O(3) fine glass powder (below 1 mu m) are investigated and discussed. The sintering was studied by contactless optical dilatometry and porosity measurements. The crystallization process was evaluated by differential scanning calorimetry (DSC) and the crystalline phase formation was analyzed by X-ray diffraction (XRD). Finally the microstructures of the samples sintered at different temperatures were observed by field emission scanning electron microscope (FESEM). The specific aim of this study was to highlight the influence of sintering temperature and heating rate on the densification process and the final structure of glass-ceramic samples. It was shown that zero water adsorption and minimum closed porosity of similar to 3% were obtained at heating rate of 2 degrees C/min and at about 1 h holding at 690 degrees C. The temperature increase accelerated intense foaming process that resulted in formation of total porosity of 35-45%. It was also demonstrated that the foaming depended on the heating rate: the higher the heating rate - the more intensive was the bloating. The observed foaming process was related to intensive crystallization and re-crystallization of La2O3 center dot SrO center dot 5B(2)O(3) crystal phase. The phase formation processes entirely completed after 30-60 min at 730-740 degrees C with the formation of intriguing and unusual crystal structures.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Non-Crystalline Solids
T1  - Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders - effect of the holding temperature and the heating rate
EP  - 382
SP  - 375
VL  - 481
DO  - 10.1016/j.jnoncrysol.2017.11.009
UR  - conv_816
ER  - 

@article{
author = "Smiljanić, Sonja and Karamanova, Emilia and Grujić, Snežana and Rogan, Jelena and Stojanović, Jovica and Matijašević, Srđan and Karamanov, Alexander",
year = "2018",
abstract = "The peculiarities of sinter-crystallization of La2O3 center dot SrO center dot 5B(2)O(3) fine glass powder (below 1 mu m) are investigated and discussed. The sintering was studied by contactless optical dilatometry and porosity measurements. The crystallization process was evaluated by differential scanning calorimetry (DSC) and the crystalline phase formation was analyzed by X-ray diffraction (XRD). Finally the microstructures of the samples sintered at different temperatures were observed by field emission scanning electron microscope (FESEM). The specific aim of this study was to highlight the influence of sintering temperature and heating rate on the densification process and the final structure of glass-ceramic samples. It was shown that zero water adsorption and minimum closed porosity of similar to 3% were obtained at heating rate of 2 degrees C/min and at about 1 h holding at 690 degrees C. The temperature increase accelerated intense foaming process that resulted in formation of total porosity of 35-45%. It was also demonstrated that the foaming depended on the heating rate: the higher the heating rate - the more intensive was the bloating. The observed foaming process was related to intensive crystallization and re-crystallization of La2O3 center dot SrO center dot 5B(2)O(3) crystal phase. The phase formation processes entirely completed after 30-60 min at 730-740 degrees C with the formation of intriguing and unusual crystal structures.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Non-Crystalline Solids",
title = "Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders - effect of the holding temperature and the heating rate",
pages = "382-375",
volume = "481",
doi = "10.1016/j.jnoncrysol.2017.11.009",
url = "conv_816"
}

Smiljanić, S., Karamanova, E., Grujić, S., Rogan, J., Stojanović, J., Matijašević, S.,& Karamanov, A.. (2018). Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders - effect of the holding temperature and the heating rate. in Journal of Non-Crystalline Solids
Elsevier Science Bv, Amsterdam., 481, 375-382.
https://doi.org/10.1016/j.jnoncrysol.2017.11.009
conv_816

Smiljanić S, Karamanova E, Grujić S, Rogan J, Stojanović J, Matijašević S, Karamanov A. Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders - effect of the holding temperature and the heating rate. in Journal of Non-Crystalline Solids. 2018;481:375-382.
doi:10.1016/j.jnoncrysol.2017.11.009
conv_816 .

Smiljanić, Sonja, Karamanova, Emilia, Grujić, Snežana, Rogan, Jelena, Stojanović, Jovica, Matijašević, Srđan, Karamanov, Alexander, "Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders - effect of the holding temperature and the heating rate" in Journal of Non-Crystalline Solids, 481 (2018):375-382,
https://doi.org/10.1016/j.jnoncrysol.2017.11.009 .,
conv_816 .

TY  - JOUR
AU  - Nikolić, Marija S.
AU  - Đorđević, Nataša
AU  - Rogan, Jelena
AU  - Donlagić, Jasna
PY  - 2015
UR  - https://ritnms.itnms.ac.rs/handle/123456789/344
AB  - Two series of poly(epsilon-caprolactone) poly(oxepan-2-one) nanocomposites with different organo-modified clays (1 to 8 wt. %) were prepared by the solution casting method. Organoclays with polar (Cloisite (R) C30B) and nonpolar (Cloisite (R) C 15A) organic modifiers and with different miscibility with the poly(epsilon-caprolactone) matrix were chosen. Exfoliated and/or intercalated structures of the nanocomposite were obtained using high dilution and ultrasonic treatment for the preparation of the composite. The effects of the surface modification and clay content on the morphology, and mechanical and thermal properties of the nanocomposites were studied. Scanning electron microscopy excluded the formation of microcomposites. The wide-angle X-ray diffraction analysis revealed that the tendency toward exfoliated structures was higher with Cloisite (R) C30B, which had better miscibility with poly(epsilon-caprolactone) matrix, than with Cloisite (R) Cl 5A. Differences in the sizes of the spherulites and morphology between two series of the nanocomposites were observed by optical microscopy performed on as-cast films. The enthalpies of fusion and degrees of crystallinity were higher for the nanocomposites than for the neat poly(epsilon-caprolactone) and increased with clay loading in both series, because of the nucleating effect of the clay. The decreased thermal stability of the nanocomposites was ascribed to the thermal instability of the organic modifiers of the clays. The Halpin-Tsai model was used to compare the theoretically predicted values of the Young's modulus with the ones experimentally obtained in tensile tests.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Influence of clay organic modifier on the morphology and performance of poly(epsilon-caprolactone)/clay nanocomposites
EP  - 547
IS  - 4
SP  - 529
VL  - 80
DO  - 10.2298/JSC140924119N
UR  - conv_498
ER  - 

@article{
author = "Nikolić, Marija S. and Đorđević, Nataša and Rogan, Jelena and Donlagić, Jasna",
year = "2015",
abstract = "Two series of poly(epsilon-caprolactone) poly(oxepan-2-one) nanocomposites with different organo-modified clays (1 to 8 wt. %) were prepared by the solution casting method. Organoclays with polar (Cloisite (R) C30B) and nonpolar (Cloisite (R) C 15A) organic modifiers and with different miscibility with the poly(epsilon-caprolactone) matrix were chosen. Exfoliated and/or intercalated structures of the nanocomposite were obtained using high dilution and ultrasonic treatment for the preparation of the composite. The effects of the surface modification and clay content on the morphology, and mechanical and thermal properties of the nanocomposites were studied. Scanning electron microscopy excluded the formation of microcomposites. The wide-angle X-ray diffraction analysis revealed that the tendency toward exfoliated structures was higher with Cloisite (R) C30B, which had better miscibility with poly(epsilon-caprolactone) matrix, than with Cloisite (R) Cl 5A. Differences in the sizes of the spherulites and morphology between two series of the nanocomposites were observed by optical microscopy performed on as-cast films. The enthalpies of fusion and degrees of crystallinity were higher for the nanocomposites than for the neat poly(epsilon-caprolactone) and increased with clay loading in both series, because of the nucleating effect of the clay. The decreased thermal stability of the nanocomposites was ascribed to the thermal instability of the organic modifiers of the clays. The Halpin-Tsai model was used to compare the theoretically predicted values of the Young's modulus with the ones experimentally obtained in tensile tests.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Influence of clay organic modifier on the morphology and performance of poly(epsilon-caprolactone)/clay nanocomposites",
pages = "547-529",
number = "4",
volume = "80",
doi = "10.2298/JSC140924119N",
url = "conv_498"
}

Nikolić, M. S., Đorđević, N., Rogan, J.,& Donlagić, J.. (2015). Influence of clay organic modifier on the morphology and performance of poly(epsilon-caprolactone)/clay nanocomposites. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 80(4), 529-547.
https://doi.org/10.2298/JSC140924119N
conv_498

Nikolić MS, Đorđević N, Rogan J, Donlagić J. Influence of clay organic modifier on the morphology and performance of poly(epsilon-caprolactone)/clay nanocomposites. in Journal of the Serbian Chemical Society. 2015;80(4):529-547.
doi:10.2298/JSC140924119N
conv_498 .

Nikolić, Marija S., Đorđević, Nataša, Rogan, Jelena, Donlagić, Jasna, "Influence of clay organic modifier on the morphology and performance of poly(epsilon-caprolactone)/clay nanocomposites" in Journal of the Serbian Chemical Society, 80, no. 4 (2015):529-547,
https://doi.org/10.2298/JSC140924119N .,
conv_498 .