摘要
非离子型表面活性剂TX 100和TX305,以及阳离子型表面活性剂溴化烷基三甲铵、氯化烷基吡啶和溴化烷基吡啶的水溶液在石英片上的接触角θ~0(石英/水/环己烷悬滴)和θ~n(石英/水/空气悬泡)随浓度的增加皆是先升后降;但θ~w(石英/水滴/环己烷)则随浓度单调增大,最后趋于一极限值。这些结果可以表面活性剂在石英/水界面形成双层吸附和在石英/环己烷界面形成单层吸附的模型来解释。阴离子型表面活性剂烷基硫酸钠在石英上不吸附,故对接触角无影响。但在TX100溶液中加入烷基硫酸钠时,θ~0和θ~w皆随TX100的浓度单调上升;加入的量大时,θ~0、θ~w和θ~a皆近于纯水的θ。这些现象与溶液中形成混合胶团导致TX100的吸附减少有关。
The contact angles of solutions of various type surfactants (including nouionics, cationics, anionics and the mixtures of anionic-nonionics) for quartz/water/cyclohexane and quartz/water/air systems have been measured. Based on the bilayer model for the surfactant (including nonionics and cationics) adsorption on the quartz/water interface, the monolayer model for the surfactant adsorption on the quartz/cyclohexane interface, and the fact that no significant adsorption of nonionic surfactants on quartz could be detected, the experimental results have been explained qualitatively.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1990年第2期165-172,共8页
Acta Scientiarum Naturalium Universitatis Pekinensis
关键词
表面活性剂
溶液
石英
吸附
润湿
Wetting
Contact angle
Adsorption
Surfactant
Quartz
Monolayer model
Bilayer model
