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ISRN Physical Chemistry
Volume 2012 (2012), Article ID 254167, 6 pages
http://dx.doi.org/10.5402/2012/254167
Research Article

Interaction of Ethanol Vapour with Silane-Modified Surface of Corning Porous Glass CPG-10

Department of Chemistry, University of Botswana, Private Bag 00704 Gaborone, Botswana

Received 7 September 2012; Accepted 1 October 2012

Academic Editors: H. Pal, T. Panczyk, and D. Strout

Copyright © 2012 Misael Silas Nadiye-Tabbiruka. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The interaction of ethanol vapour at 293 K with modified Corning controlled porous glass (CPG-10) samples of various pre-silylation is reported. Ethanol adsorption on CPG-10 was greatly reduced by silylation to extents largely depending on the silylation extent, type of silane used, and on the concentration and accessibility of residual silanols. The obtained adsorption isotherms, BET surface areas, as well as the observed changes at the various stages during the sorption particularly in the capillary condensation region also showed similar dependence. In the capillary condensation region, in the case of the dimethyl dichlorosilane-modified sample, hysteresis type was changed from H3 to H1. On the triethyl chlorosilane-modified sample an unexpected suppression of hysteresis effects occurred with a consequent transformation of type IV to type II adsorption isotherm.