TY  - JOUR
AU  - Stojanović, D.
AU  - Orlović, A.
AU  - Glišić, S. B.
AU  - Marković, Smilja
AU  - Radmilović, Velimir R.
AU  - Uskoković, Petar S.
AU  - Aleksić, Radoslav
PY  - 2010
UR  - https://dais.sanu.ac.rs/123456789/3427
AB  - The objective of this study is to investigate and compare methods of nanosilica coating with γ-methacryloxypropyltrimethoxy (MEMO) silane using supercritical carbon dioxide and carbon dioxide-ethanol mixture. Characterization of grafted silane coupling agent on the nanosilica surface was performed by the infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The d50 value and particle size distribution were determined by laser particle size analyzer (PSA). The operating parameters of silanization process at 40 °C, such as the silica/silane weight ratio, the presence of ethanol, and the pressure, were found to be important for the successful coating of silica particles with minimum agglomeration. The results indicate that presence of ethanol in high-pressure carbon dioxide plays an important role in achieving successful deagglomeration of coated nanoparticles. Dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM) revealed that dispersion of the silica particles in the PMMA matrix and interfacial adhesion between silica particles and polymer matrix were enhanced, when silica nanoparticles treated with silane under high pressure of carbon dioxide and ethanol were used for the nanocomposite preparation. © 2010 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Journal of Supercritical Fluids
T1  - Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure of carbon dioxide and ethanol
SP  - 276
EP  - 284
VL  - 52
IS  - 3
DO  - 10.1016/j.supflu.2010.02.004
UR  - https://hdl.handle.net/21.15107/rcub_dais_3427
ER  - 

@article{
author = "Stojanović, D. and Orlović, A. and Glišić, S. B. and Marković, Smilja and Radmilović, Velimir R. and Uskoković, Petar S. and Aleksić, Radoslav",
year = "2010",
abstract = "The objective of this study is to investigate and compare methods of nanosilica coating with γ-methacryloxypropyltrimethoxy (MEMO) silane using supercritical carbon dioxide and carbon dioxide-ethanol mixture. Characterization of grafted silane coupling agent on the nanosilica surface was performed by the infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The d50 value and particle size distribution were determined by laser particle size analyzer (PSA). The operating parameters of silanization process at 40 °C, such as the silica/silane weight ratio, the presence of ethanol, and the pressure, were found to be important for the successful coating of silica particles with minimum agglomeration. The results indicate that presence of ethanol in high-pressure carbon dioxide plays an important role in achieving successful deagglomeration of coated nanoparticles. Dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM) revealed that dispersion of the silica particles in the PMMA matrix and interfacial adhesion between silica particles and polymer matrix were enhanced, when silica nanoparticles treated with silane under high pressure of carbon dioxide and ethanol were used for the nanocomposite preparation. © 2010 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Journal of Supercritical Fluids",
title = "Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure of carbon dioxide and ethanol",
pages = "276-284",
volume = "52",
number = "3",
doi = "10.1016/j.supflu.2010.02.004",
url = "https://hdl.handle.net/21.15107/rcub_dais_3427"
}

Stojanović, D., Orlović, A., Glišić, S. B., Marković, S., Radmilović, V. R., Uskoković, P. S.,& Aleksić, R.. (2010). Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure of carbon dioxide and ethanol. in Journal of Supercritical Fluids
Elsevier., 52(3), 276-284.
https://doi.org/10.1016/j.supflu.2010.02.004
https://hdl.handle.net/21.15107/rcub_dais_3427

Stojanović D, Orlović A, Glišić SB, Marković S, Radmilović VR, Uskoković PS, Aleksić R. Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure of carbon dioxide and ethanol. in Journal of Supercritical Fluids. 2010;52(3):276-284.
doi:10.1016/j.supflu.2010.02.004
https://hdl.handle.net/21.15107/rcub_dais_3427 .

Stojanović, D., Orlović, A., Glišić, S. B., Marković, Smilja, Radmilović, Velimir R., Uskoković, Petar S., Aleksić, Radoslav, "Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure of carbon dioxide and ethanol" in Journal of Supercritical Fluids, 52, no. 3 (2010):276-284,
https://doi.org/10.1016/j.supflu.2010.02.004 .,
https://hdl.handle.net/21.15107/rcub_dais_3427 .

TY  - JOUR
AU  - Stojanović, D.
AU  - Orlović, A.
AU  - Marković, Smilja
AU  - Radmilović, Velimir R.
AU  - Uskoković, Petar S.
AU  - Aleksić, Radoslav
PY  - 2009
UR  - https://dais.sanu.ac.rs/123456789/3457
AB  - Nanosilica/poly(methyl methacrylate) (PMMA) composites are used to improve the mechanical properties of neat PMMA polymer. In order to obtain superior mechanical properties, it is essential to achieve good bonding between the SiO2 nanoparticles and the PMMA matrix, which is typically achieved by coating silica nanoparticles with silane coupling agents. In this study, conventional and supercritical coating methods were investigated together with their influence on the mechanical properties of the obtained nanosilica/PMMA composites. The results indicate advantageous properties of nanosilica modified in the supercritical phase of carbon dioxide and ethanol in terms of particle size distribution, amount of coated silane, and dispersion in the PMMA matrix. Careful dispersion of the starting silica nanoparticles in ethanol at low temperatures in order to obtain a nanosilica sol plays an important role in deagglomeration, dispersion, and the coating process. The resulting nanosilica/PMMA composite containing nanoparticles obtained by supercritical processing of the nanosilica sol showed an increase in hardness by 44.6% and elastic modulus by 25.7% relative to neat PMMA, as determined using the nanoindentation technique. The dynamic mechanical analysis reveals that addition of nanoparticles as nanosilica sol and nanosilica gel enhances composite storage modulus by about 54.3 and 46.5% at 40 °C. At the same temperature, incorporation of modified silica nanoparticles with conventional method leads to an increase of 15.9% for the storage modulus, probably due to a large silica particle size and lower silane content in this sample. © 2009 Springer Science+Business Media, LLC.
PB  - Springer
T2  - Journal of Materials Science
T1  - Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture
SP  - 6223
EP  - 6232
VL  - 44
IS  - 23
DO  - 10.1007/s10853-009-3842-8
UR  - https://hdl.handle.net/21.15107/rcub_dais_3457
ER  - 

@article{
author = "Stojanović, D. and Orlović, A. and Marković, Smilja and Radmilović, Velimir R. and Uskoković, Petar S. and Aleksić, Radoslav",
year = "2009",
abstract = "Nanosilica/poly(methyl methacrylate) (PMMA) composites are used to improve the mechanical properties of neat PMMA polymer. In order to obtain superior mechanical properties, it is essential to achieve good bonding between the SiO2 nanoparticles and the PMMA matrix, which is typically achieved by coating silica nanoparticles with silane coupling agents. In this study, conventional and supercritical coating methods were investigated together with their influence on the mechanical properties of the obtained nanosilica/PMMA composites. The results indicate advantageous properties of nanosilica modified in the supercritical phase of carbon dioxide and ethanol in terms of particle size distribution, amount of coated silane, and dispersion in the PMMA matrix. Careful dispersion of the starting silica nanoparticles in ethanol at low temperatures in order to obtain a nanosilica sol plays an important role in deagglomeration, dispersion, and the coating process. The resulting nanosilica/PMMA composite containing nanoparticles obtained by supercritical processing of the nanosilica sol showed an increase in hardness by 44.6% and elastic modulus by 25.7% relative to neat PMMA, as determined using the nanoindentation technique. The dynamic mechanical analysis reveals that addition of nanoparticles as nanosilica sol and nanosilica gel enhances composite storage modulus by about 54.3 and 46.5% at 40 °C. At the same temperature, incorporation of modified silica nanoparticles with conventional method leads to an increase of 15.9% for the storage modulus, probably due to a large silica particle size and lower silane content in this sample. © 2009 Springer Science+Business Media, LLC.",
publisher = "Springer",
journal = "Journal of Materials Science",
title = "Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture",
pages = "6223-6232",
volume = "44",
number = "23",
doi = "10.1007/s10853-009-3842-8",
url = "https://hdl.handle.net/21.15107/rcub_dais_3457"
}

Stojanović, D., Orlović, A., Marković, S., Radmilović, V. R., Uskoković, P. S.,& Aleksić, R.. (2009). Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture. in Journal of Materials Science
Springer., 44(23), 6223-6232.
https://doi.org/10.1007/s10853-009-3842-8
https://hdl.handle.net/21.15107/rcub_dais_3457

Stojanović D, Orlović A, Marković S, Radmilović VR, Uskoković PS, Aleksić R. Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture. in Journal of Materials Science. 2009;44(23):6223-6232.
doi:10.1007/s10853-009-3842-8
https://hdl.handle.net/21.15107/rcub_dais_3457 .

Stojanović, D., Orlović, A., Marković, Smilja, Radmilović, Velimir R., Uskoković, Petar S., Aleksić, Radoslav, "Nanosilica/PMMA composites obtained by the modification of silica nanoparticles in a supercritical carbon dioxide-ethanol mixture" in Journal of Materials Science, 44, no. 23 (2009):6223-6232,
https://doi.org/10.1007/s10853-009-3842-8 .,
https://hdl.handle.net/21.15107/rcub_dais_3457 .