Abstract: The wetting properties of quartz surface by adsorption films formed by cationic surfactants hexadecylglycidyl ether ammonium chloride and zwitterionic surfactants hexadecylglycidyl ether glycine betaine with different structures were investigated using the sessile drop analysis. The influence of different electrolytes was expounded. The results show that cationic surfactant molecules can form a monolayer on quartz surface through electrostatic interaction, which leads to higher values during low bulk concentrations. However, the contact angle decreases sharply due to the formation of bilayer film through hydrophobic interaction. The zwitterionic surfactants adsorb on quartz surface through weak Lifshitzvan der Waals interaction and the contact angle passes through a maximum with the increasing bulk concentration. Moreover, zwitterionic surfactant with larger molecular size is difficult to form bilayer structure. The addition of electrolytes shows little influence on zwitterionic surfactant systems, but reduces contact angles of cationic surfactant systems obviously.

Key words: Cationic surfactant,    ,  Zwitterionic surfactant,    ,  Electrolyte,    , Contact angle,    ,  Quartz surface

摘要： 利用座滴法研究了不同结构阳离子表面活性剂十六烷基羟丙基季铵盐和两性离子表面活性剂十六 烷基羟丙基羧酸甜菜碱在石英表面形成的吸附膜对固体表面润湿性的影响,并考察了不同类型电解质对其接触角的影响趋势。结果表明,阳离子表面活性剂通过静电作用在石英表面形成单层吸附膜,低浓度时接触角数值较高;高浓度时通过疏水作用形成双层膜,接触角陡降。两性离子表面活性剂通过较弱的Lifshitz灢vanderWaals作用力在石英表面吸附,接触角随浓度增大通过一个极大值,较大的分子尺寸不利于形成双层膜结构。电解质的加入对于两性离子表面活性剂体系影响不大,但能明显降低阳离子体系的接触角。

关键词: 阳离子表面活性剂,    , 两性表面活性剂,    , 电解质,    , 接触角,    , 石英表面