Surface modification of silica particles assisted by CO2 |
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| Affiliation: | 1. National Research & Development Institute for Chemistry and Petrochemistry ICECHIM, Splaiul Independentei No. 202, 6th District, P.O. 35-174, 060021 Bucharest, Romania;2. University of Bucharest, Faculty of Physics, 3Nano-SAE Research Centre, P.O. Box MG-38, 077125 Magurele, Romania;3. University of Bucharest, Faculty of Chemistry, Bd. Regina Elisabeta 4-12, 1st District, Bucharest, Romania;4. University Politehnica of Bucharest, Faculty of Applied Chemistry and Materials Science, 1-7 Polizu St., 011061 Bucharest, Romania;1. Academy of Scientific and Innovative Research, 2-Rafi Marg, New Delhi, 110001, India;2. Analytical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad, 500007, India;1. Nippon AEROSIL Co. Ltd., 3 Mita-cho, Yokkaichi, Mie 510-0841, Japan;2. Advanced Ceramics Research Center, Nagoya Institute of Technology, 3-101-1, Honmachi, Tajimi, Gifu 507-0033, Japan;1. Department of Electrical and Computer Engineering, Rowan University, Glassboro, NJ 08028, USA;2. Systems Engineering Department, University of Arkansas at Little Rock, Little Rock, AR 72204, USA;3. Department of Health, Human Performance, and Sport Management, University of Arkansas at Little Rock, Little Rock, AR 72204, USA;1. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russian Federation;2. National University of Science and Technology ‘MISIS’, 119049 Moscow, Russian Federation;3. Kazan National Research Technological University, 420015 Kazan, Russian Federation |
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| Abstract: | This paper reports the synthesis of coating silica particles, in order to design hybrid materials with hydrophobic surface properties. The silica particles were prepared in basic conditions under atmosphere of carbon dioxide (CO2), using tetraethylorthosilicate (TEOS) as a precursor and octyltriethoxysilane (OTES) as a surface modifying agent. It was demonstrated that the contact angles of silica hybrid films could be changed by varying temperature and pressure of CO2. The investigation of the prepared hybrid materials by dynamic light scattering (DLS) and environmental scanning electron microscopy (ESEM), respectively, showed that they consisted mainly of particles with a diameter of 100–250 nm. Fourier transform infrared (FT-IR) spectra indicate that the interaction between the coupling reagents, at different conditions, is mainly through chemical bonding. |
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| Keywords: | Surface modification Supercritical coating Contact angle Silica particles Morphology |
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