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Role of the Concentration and Nature of Grafted Groups in the Adsorption of Hydrocarbon Vapors on Silica Modified by Monofunctional Polyfluoroalkylsilanesстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Roshchina T.M., Shoniya N.K., Tayakina O.Ya, Tkachenko O.P., Kustov L.M., Bernardoni F., Fadeev A.Y.
- Журнал: Russian Journal of Physical Chemistry A
- Том: 86
- Номер: 3
- Год издания: 2012
- Издательство: Pleiades Publishing, Ltd
- Местоположение издательства: Road Town, United Kingdom
- Первая страница: 437
- Последняя страница: 446
- DOI: 10.1134/S0036024412030260
- Аннотация: The role of the grafting density of monofunctional polyfluoroalkylsilanes of the CnF2n – 1(CH2)mSi(CH3)2Cl general formula (where n = 3, 4, and 6; and m = 2 and 3) and their composition in intermolecular interactions of the molecules of saturated and aromatic hydrocarbons with a surface of chemically modified silica is studied by means of IR spectroscopy and adsorptionstatic and gas chromatography. It is shown that the higher the concentration and the shorter the length of the grafted chain, the greater (by a factor of 2 to 25) the drop in the adsorption values of hydrocarbons as a result of modifications, due to an increase in the degree of oleophobization of surface upon the formation of polyorganofluorine coatings. The high specificity of the surface with respect to benzene, which is due to the active participation of the polar fragment of a grafted chain in adsorption process, is related to the features of a relatively lowdensity sample with a concentration of grafted perfluorobutyl groups of 1.7 nm–2. It is shown that the thermodestruction of polyfluoroalkyl silica remains virtually unobserved upon heating to 523 K in an argon flow.
- Добавил в систему: Рощина Татьяна Михайловна