Characterization of Titanium Dioxide Modified with Alcoholic Hydroxyl Groups

Abstract

The chemical vapor deposition of 1,3,5,7-tetramethylcyclotetrasiloxane (H₄) was employed on titanium dioxide, in which H₄ was polymerized to form a coating layer of poly (methylsiloxane) (PMS). TiO₂ modified with alcoholic hydroxyl groups was synthesized from PMS-coated TiO₂ by hydrosilylation. The OH groups on TiO₂ were confirmed by Fourier transform infrared spectrophotometry and thermal analysis.
Since TiO₂ modified with OH groups inhibited the dehydration of t-butyl alcohol and did not absorb, dl-a-tocopherol, active sites hardly existed on the surface.
From dispersibility and contact angle measurments TiO₂ modified with OH groups was found to be hydrophilic. The dispersibility was influenced by the density of OH group on the surface and the number of OH group in a PMS molecule on TiO₂.