THE WETTABILITY OF FLUOROCARBON AND CHLOROCARBON TRIALKOXYSILANE FILMS ADSORBED ON GLASS AND METAL SURFACE
NAVAL RESEARCH LAB WASHINGTON DC
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Adsorbed films having a wide range of wettabilities have been formed on silica, Pyrex, aluminosilicate, alpha-alumina, steel, and gold by trialkoxysilane and trichlorosilane compounds. These compounds had the general formulas RSiOR3 or RSiCl3, where R- was a fluorocarbon or a chlorocarbon group and -OR was -OCH3 or -OCH2CH3. The fluorocarbon films had gamma values of 20 dynescm and water contact angles of 100 to 118 degrees. The chlorocarbon films had gamma values of 40 dynescm and water contact angles of 80 to 90 degrees. Film thickness, determined by ellipsometry, was consistently greater than a monolayer of the trialkoxysilane. Desorption experiments suggest that the films were composed of a polysiloxane network along with unhydrolyzed adsorbate, small polysiloxane molecules, and solvent. The fluorocarbon compounds have potential for forming oleophobic barrier films in lubricated devices.
- Physical Chemistry
- Lubricants and Hydraulic Fluids