十六烷基三甲基溴化铵在二氧化硅表面吸附的研究

Adsorption of cetyl trimethylammonium bromide on surface of silicon dioxide

十六烷基三甲基溴化铵在亲水二氧化硅表面的吸附呈现出两阶段的特点，在第一阶段对应单分子层吸附，而第二阶段对应双分子层吸附，用椭圆偏振法测出的十六烷基三甲基溴化铵在二氧化硅表面吸附层的厚度表明了这个特性。同时进行了十六烷基三甲基溴化铵吸附层厚度与水在二氧化硅表面的接触角关系的研究，说明了因吸附引起的二氧化硅表面润湿性的变化，与吸附的两阶段模型吻合。用十四烷基三甲基溴化铵所得的实验结果验证了上述看法。

Our ellipsometric measurements of the adsorption layer thickness have shown that the adsorption of cetyl trimethylammonium bromide(CTAB) on the hydrophilic surface of SiO 2 shows two step characteristics:the first step corresponds to the single molecular layer adsorption and the second step corresponds to the double molecular layer adsorption.Meanwhile,the contact angle changes of the SiO 2 surface are consistent with the two step adsorption model The experimental data of tetradecyl trimethylammonium bromide(TTAB) adsorption on the SiO 2 surface supported the above results.