Thermodynamic of obtaining of monodisperse particles SiO2 by tetraethoxysilane hydrolysis in the Si-OH-C-N system.
The problem of synthesizing of mono disperse SiO2 particles with hydrolysis (C2H5O)4Si by the Stober method is described. The purpose of the study is to determine the conditions for the passage of this reaction in a water-ammonia-alcohol medium, at which the maximum concentration of the solid phase...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Odessa National Polytechnic University
2018-04-01
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| Series: | Trudy Odesskogo Politehničeskogo Universiteta |
| Subjects: | |
| Online Access: | http://pratsi.opu.ua/app/webroot/articles/1529397165.pdf |
| Summary: | The problem of synthesizing of mono disperse SiO2 particles with hydrolysis (C2H5O)4Si by the Stober method is described. The purpose of the study is to determine the conditions for the passage of this reaction in a water-ammonia-alcohol medium, at which the maximum concentration of the solid phase of SiO2 and the minimum concentration of silicon ion compounds in solution are reached. By thermodynamic modeling the composition of the Si-O-H-C-N system under thermodynamic equilibrium for various given conditions was studied. The maximum amount of solid phase SiO2 at different initial concentrations (C2H5O)4Si is achieved at an initial concentration of C2H5OH more than 1.2 mol/l, the concentration of the solid phase of SiO2 is proportional to the initial concentration (C2H5O)4Si. Thermodynamic studies show that a change in the reaction temperature from 1 to 70 C does not affect the concentration of ionic silicon compounds in the solution and the solid phase of SiO2. The obtained results reduce the search for optimal conditions for the production of monodisperse particles of SiO2 and allow a deeper understanding of the processes taking place in the Si-O-H-C-N system. |
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| ISSN: | 2076-2429 2223-3814 |