Adsorption Characteristics of Silica Gels Treated with Fluorinated Silylation Agents
✍ Scribed by Takashi Monde; Nobuyuki Nakayama; Koji Yano; Toshinobu Yoko; Takeo Konakahara
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 399 KB
- Volume
- 185
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
The purpose of this work is to measure adsorption iso-Branched-chain polyfluorosilane (monochlorodimethyl[4,4-bistherms of polar and nonpolar molecules on silica gels modi-(trifluoromethyl)-5,5,6,6,7,7,7-heptafluoroheptyl)-bonded silica fied with various silylation agents, and to discuss the surface gels were prepared. The surface properties of the silica gels modiproperties of fluorocarbon-bonded silica gels in comparison fied with various organic silanes were evaluated by the adsorption with hydrocarbon-bonded silica gels.
density of polar and nonpolar gases calculated from adsorption isotherms of nitrogen, carbon dioxide, and normal butane gases. The polyfluorocarbon-bonded silica gel surface was found to be MATERIALS AND METHODS both hydrophobic and oleophobic in nature, whereas the hydrocarbon-bonded silica gel surface was characterized only as hydropho-Preparation of the Modified Silica Gels bic. The trifunctional fluorinated silane provides the silica gel surface with a more hydrophilic nature than the monofunctional si-Silica gels supplied by Develosil 100-5(Nomura Chemilane because of the formation of a denser polymeric coating layer cal Co. Ltd., Japan) were used as a substrate for coating, with a larger number of silanols.