Heat of Reaction of the Hydrolysis-Polymerization Process of Tetraethyl Orthosilicate in Acidic Condition |
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| Authors: | Jun Matsuoka Minoru Numaguchi Satoshi Yoshida Naohiro Soga |
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| Institution: | (1) Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga, 522-8533, Japan;(2) Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga, 522-8533, Japan |
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| Abstract: | Heat of reaction of the hydrolysis-polymerization process of tetraethyl orthosilicate with water in acidic condition was investigated to clarify the thermodynamic driving force of sol-gel reactions. Heat of reaction was measured using an isoperibol calorimeter by mixing a dilute tetraethyl orthosilicate (TEOS) ethanolic solution with another solution of water, ethanol, and hydrochloric acid. The temperature change of the reaction cell had been measured more than 24 hours after mixing under the quasi-isothermal condition. Large exothermic reaction (12.9 kJ·mol–1 for 1 mole of TEOS) due to the hydrolysis of TEOS was observed. A slow exothermic reaction followed it, and after that, the sol-gel reaction was changed to a small endothermic one. |
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| Keywords: | heat of reaction tetraethyl orthosilicate heat of hydrolysis heat of polymerization sol-gel |
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