Density, Specific Surface Area and Particle Size Distribution of Surface-treated Silica II -Evaluation of Treatment State-

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  • MIYAZAKI Kiyomi
    Department of Dental Materials, Nihon University School of Dentistry

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  • 表面処理したシリカの粉粒体としての物性 II -遠心分離法で分離した処理シリカの表面処理状態についての検討-

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To determine the treatment state of surface treated silica, density, specific surface area and particle size were examined. As silane coupling agents, γ-Methacryloxypropyltrimethoxysilane (γ-MPTS), Vinyltrimethoxysilane (VTMS) and Vinyltrichlorosilane (VCLS) were used and the silica was treated under the wet process. These treated silica were separated by centrifugation and dried in vacuo. Then physical properties were examined. The effects of additional surface treatments for treated-silica, such as rinsing with Tetrahydrofuran (THF) or heat-treatment, on these physical properties were also examined.<br> Density and specific surface area were highly sensitive as a parameter for treatment state of surface treated silica. Therefore, the refection of these properties was comparatively clear in following areas: changes in the amount of deposited silane relative to increases in the concentration of the coupling agent, a decrease in the deposited silane due to the rinse-treatment or changes in the adsorption state due to rinse-treatment and heat-treatment. However, particle size was thought to be a less sensitive parameter, because it showed little change in this study.

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