The nature of lyophobic coating and the adsorption of organic molecules and water on modified silicas

Shoniya, N. K.; Roshchina, T. M.; Nikol’skaya, A. B.; Tayakina, O. Ya.; Ткаченко, О. П.; Kustov, L. М.; Fadeev, Alexander Y.

doi:10.1134/s0036024410110221

Cited by 5 publications

(1 citation statement)

References 14 publications

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“…It should be noted that on the sample prepared via modification by monochlorosilane with trifluorome thyl groups and with a high density of the grafted layer (2.0 nm -2 ), no changes in the frequency of stretching vibrations of OH groups were observed upon the adsorption of benzene [26]. This confirms that hydroxyl groups can be absent on the surface of the CMS at sufficiently high concentrations of grafted groups that can react with benzene with the formation of hydrogen bonds.…”

Section: Ir Spectroscopysupporting

confidence: 67%

Role of the concentration and nature of grafted groups in the adsorption of hydrocarbon vapors on silica modified by monofunctional polyfluoroalkylsilanes

Roshchina

Shoniya

Tayakina

et al. 2012

Russ. J. Phys. Chem.

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The role of the grafting density of monofunctional polyfluoroalkylsilanes of the C n F 2n -1 (CH 2 ) m Si(CH 3 ) 2 Cl 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 adsorption static and gas chromato graphy. 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 coat ings. 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 low density sample with a concentration of grafted perfluorobutyl groups of 1.7 nm -2 . It is shown that the thermodestruc tion of polyfluoroalkyl silica remains virtually unobserved upon heating to 523 K in an argon flow.

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Section: Ir Spectroscopysupporting

confidence: 67%