PENETRATION OF AQUEOUS SURFACTANT SOLUTIONS INTO THIN HYDROPHOBIZED CAPILLARIES

被引:12
作者
CHURAEV, NV
ZORIN, ZM
机构
[1] Institute of Physical Chemistry, Russian Academy of Sciences, Moscow, 117915
关键词
AQUEOUS SURFACTANT SOLUTIONS; CAPILLARY SUCTION; SURFACE DIFFUSION; THIN HYDROPHOBIZED CAPILLARIES;
D O I
10.1016/0927-7757(95)03150-C
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Three mechanisms of the penetration of surfactant solutions into hydrophobized capillaries are possible. The first takes place at high concentrations C-0 > CMC. Spontaneous penetration corresponds to a high rate, but is limited to some finite length. The second mechanism is realized when C-0 < CMC. The rate of penetration in this case is much lower, and is controlled by the reduced concentration C-m at the meniscus. At an even lower concentration, the diffusion mechanism of penetration takes place. The rate of penetration is determined here by the surface diffusion of surfactant molecules in front of the meniscus. Forced absorption is not effective, since, as a result of adsorption, the surfactant molecules cannot reach the surface of the advanced meniscus.
引用
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页码:131 / 138
页数:8
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