Preparation of KHSO4/SiO2 Nanocomposites and Their Physical Properties |
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| Authors: | Plocek J. Nižňanský D. Vaněk P. Mička Z. |
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| Affiliation: | (1) Department of Inorganic Chemistry, Faculty of Science of Charles University, Albertov 6, 128 43 Prague 2, Czech Republic;(2) Institute of Inorganic Chemistry AS CR, Rez near Prague, Czech Republic;(3) Institute of Physics AS CR, Prague, Czech Republic |
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| Abstract: | ![]()
A series of SiO2/KHSO4 nanocomposites with various SiO2/salt ratios was prepared where the active compound was added before gelation. The sol was prepared by mixing of these hydrogen salts, TEOS (tetraethyl orthosilicate) and water. After gelation and heat treatment (heating slowly to 200–220°C under vacuum), the samples were characterized by X-ray diffraction, Differential Scanning Calorimetry (DSC), IR spectroscopy, Scanning Electron Microscopy (SEM), and High Resolution Transition Electron Microscopy (HR TEM). DSC measurements showed phase transition temperature shifts that depended on the SiO2/salt ratio. The properties of the nanocomposite samples were compared with the bulk materials. The shift in the phase transitions to lower temperatures was attributed to the particle size effect. |
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| Keywords: | nanocomposite hydrogensulphate phase transition sol-gel ionic conductor DSC SEM HR TEM IR spectroscopy |
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