Kinetics of the SiO2 Aerogel Dissolution in Aqueous NaOH Solutions: Experiment and Model Научная публикация
Журнал |
Journal of Non-Crystalline Solids
ISSN: 0022-3093 , E-ISSN: 1873-4812 |
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Вых. Данные | Год: 1999, Том: 260, Номер: 1-2, Страницы: 21-30 Страниц : 10 DOI: 10.1016/S0022-3093(99)00568-2 | ||||
Ключевые слова | Activation energy; Aerogels; Curve fitting; Diffusion in liquids; Mathematical models; Particle size analysis; Porosity; Silica; Sodium compounds; Solutions; Thermal effects; X ray scattering | ||||
Авторы |
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Организации |
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Информация о финансировании (3)
1 | Российский фонд фундаментальных исследований | 97-03-32471 |
2 | Министерство образования и науки Российской Федерации | 3H-256-97 |
3 | Сибирское отделение Российской академии наук |
Реферат:
The paper is devoted to the study of the kinetics of silica aerogel dissolution in 0.05–0.79 M NaOH aqueous solutions at temperatures 15–56°C. The aerogel samples are prepared via common one- and two-step procedures, and differ considerably in the primary particle size. Kinetic peculiarities of the process are studied under both reaction and diffusion controlled modes and kinetic parameters are established by experimental curve fitting. The dissolution activation energy is found to be equal to 82±6 kJ/mol for all the aerogels. The dissolution kinetic curves appear to be S-shaped, so that the process rate passes through a maximum. The coincidence of SAXS and BET specific surface areas indicates that the aerogels have no closed porosity so the initial rate increase cannot be explained by the opening of closed pores. A new modification of the Iler dissolution kinetic model has been developed to describe the experimentally observed kinetic curves.
Библиографическая ссылка:
Okunev A.G.
, Shaurman S.A.
, Danilyuk A.F.
, Aristov Y.I.
, Bergeret G.
, Renouprez A.
Kinetics of the SiO2 Aerogel Dissolution in Aqueous NaOH Solutions: Experiment and Model
Journal of Non-Crystalline Solids. 1999. V.260. N1-2. P.21-30. DOI: 10.1016/S0022-3093(99)00568-2 WOS Scopus РИНЦ
Kinetics of the SiO2 Aerogel Dissolution in Aqueous NaOH Solutions: Experiment and Model
Journal of Non-Crystalline Solids. 1999. V.260. N1-2. P.21-30. DOI: 10.1016/S0022-3093(99)00568-2 WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 14 янв. 1999 г. |
Опубликована online: | 18 нояб. 1999 г. |
Опубликована в печати: | 1 дек. 1999 г. |
Идентификаторы БД:
Web of science | WOS:000083764100003 |
Scopus | 2-s2.0-0033342413 |
РИНЦ | 13315623 |
Chemical Abstracts | 1999:754303 |
Chemical Abstracts (print) | 132:82124 |
OpenAlex | W2063714344 |