The Adsorption of Saturated and Aromatic Hydrocarbon Vapors on Silicas with Chemically Grafted Perfluorohexyl Groups

Regardless of the nature of the modifier (mono-, bi-, and trichlorosilanes with perfluorohexyl groups or monochlorooctylsilane), the modification of silica decreased retention volumes and adsorption values of both n -alkanes and aromatic hydrocarbons. The entropy factor can play a key role in adsorp...

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Bibliographic Details
Published inRussian Journal of Physical Chemistry Vol. 82; no. 3; pp. 390 - 396
Main Authors Roshchina, T. M., Shoniya, N. K., Lagutova, M. S., Fadeev, A. Yu
Format Journal Article
LanguageEnglish
Published Moscow Nauka/Interperiodica 01.03.2008
Subjects
Chemistry
Chemistry and Materials Science
Physical Chemistry
Physical Chemistry of Surface Phenomena
Silochrom
Graphitized Thermal Carbon
Free Silanol Group
Trichlorosilanes
Residual Silanol Group
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Summary:Regardless of the nature of the modifier (mono-, bi-, and trichlorosilanes with perfluorohexyl groups or monochlorooctylsilane), the modification of silica decreased retention volumes and adsorption values of both n -alkanes and aromatic hydrocarbons. The entropy factor can play a key role in adsorption intermolecular interactions on the surface of chemically modified silicas. The modification of the surface with bi- and trichloroperfluorohexylsilanes caused the appearance of new centers more active compared with those of the initial carrier. The most oleophobic and nonpolar coatings were obtained using monochlorosilane with perfluorohexyl groups as a modifier.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024408030114