Wettability of glass-bead surface modified by trimethylchlorosilane
Wettability of glass-bead surface modified by trimethylchlorosilane
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DOI：
10.1021/jp981983d
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发表时间：
1998-12-17
影响因子：
3.3
通讯作者：
Chikazawa, M
中科院分区：
文献类型：
--
作者：
Fuji, M;Fujimori, H;Chikazawa, M
改性玻璃珠表面疏水基团的覆盖度与润湿性或分散能力等宏观性能之间的关系已得到证明。通过三甲基氯硅烷分子与表面硅烷醇之间的化学反应获得三甲基硅基（TMS）基团表面改性的玻璃珠。 TMS 覆盖度是通过燃烧气体分析的碳含量、使用红外光谱和通过氪吸附确定的比表面积来估计的。通过漂浮试验和测量接触角来检查样品对水的宏观润湿性。结果总结如下。 (1) 本研究中采用的表面测定使人们能够测量小表面积样品上的少量 TMS 基团。 (2)从漂浮试验和接触角测量的结果可以看出，在TMS覆盖率约为单层覆盖率的50%时，宏观润湿性发生显着变化。 (3)润湿模拟和模型可以解释改性玻璃珠颗粒表面的润湿性。结果表明，材料的润湿性与改性剂的体积和分子水平上的表面覆盖率密切相关。
The relationship between coverage of hydrophobic groups on modified glass bead surfaces and macroscopic properties such as wettability or dispersion ability has been demonstrated. The glass bead surfaces modified by trimethylsilyl (TMS) groups were obtained by the chemical reaction between trimethylchlorosilane molecules and surface silanols. The TMS coverage was estimated from carbon content by combustion gas analysis, using IR spectroscopy and the specific surface area determined by krypton adsorption. The macroscopic wettability of the samples for water was examined by floating tests and measuring contact angles. The results are summarized as follows. (1) The surface determination, employed in this study, enables one to measure small amounts of TMS groups on small-surface-area samples. (2) It was recognized from the results of the floating test and the contact angle measurement that macroscopic wettability changed markedly at the TMS coverage of about 50% of monolayer coverage. (3) The simulation and model of wetting can account for the wettability of a modified glass-bead particle surface. It was demonstrated that the wettability of material had a close relation to the bulkiness of modifier and the surface coverage on the molecular level.