Dynamic interfacial tension of surfactant mixtures at liquid-liquid interfaces

被引:51
作者
Campanelli, JR [1 ]
Wang, XH [1 ]
机构
[1] Concordia Univ, Montreal, PQ H3G 1M8, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
adsorption kinetics; diffusion coefficients; dynamic interfacial tension; Span; 80; surfactant mixtures; Triton X-100;
D O I
10.1006/jcis.1999.6149
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
Dynamic interfacial tensions for surfactant mixtures at liquid-liquid interfaces were obtained with a drop volume tensiometer, The surfactants tested were Triton X-100, palmitic acid, and Span 80 at both the water-hexadecane and water-mineral oil interfaces. Two-surfactant mixtures were examined with the surfactants initially dissolved in different phases to minimize bulk-phase interactions, For concentrations below the CMC, it was found that the adsorption kinetics of palmitic acid and Triton X-100 mixtures were dominated by the latter surfactant. Apparent diffusion coefficients were obtained for Triton X-100 both in the absence and in the presence of palmitic acid. These values were largely insensitive to the presence of palmitic acid. For mixtures of Span 80 and Triton X-100, the adsorption kinetics were found to be influenced significantly by both surfactants. In this case, relative changes in surfactant concentrations affected the dynamic interfacial tension of the mixed system. A previously proposed multicomponent adsorption model described the dynamic interfacial tension adequately at low concentrations of Triton X-100, when desorption could be neglected. At higher concentrations, modifications were needed to account for solubilization into the oil phase. These corrections allowed the model to describe the long time adsorption quite well, However, predicted values of short time interfacial tensions were over-estimated, likely due to a synergistic interaction of the two surfactants. (C) 1999 Academic Press.
引用
收藏
页码:340 / 351
页数:12
相关论文
共 16 条
[1]   Effect of neck formation on the measurement of dynamic interfacial tension in a drop volume tensiometer [J].
Campanelli, JR ;
Wang, XH .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1997, 190 (02) :491-496
[2]   Comments on modelling the diffusion-controlled adsorption of surfactants [J].
Campanelli, JR ;
Wang, XH .
CANADIAN JOURNAL OF CHEMICAL ENGINEERING, 1998, 76 (01) :51-57
[3]  
Dukhin S.S., 1995, Dynamics of Adsorption at Liquid Interfaces
[4]   Dynamic interfacial tensions of aqueous triton X-100 solutions in contact with air, cyclohexane, n-heptane, and n-hexadecane [J].
Gobel, JG ;
Joppien, GR .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1997, 191 (01) :30-37
[5]   DYNAMIC SURFACE-TENSION OF SURFACTANT SOLUTIONS STUDIED BY PEAKTENSIOMETRY [J].
HOROZOV, T ;
JOOS, P .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1995, 173 (02) :334-342
[6]  
*ICI SURF, 1996, SPAN 80 PROD INF B
[7]   COMMENTS ON SOME DYNAMIC SURFACE-TENSION MEASUREMENTS BY THE DYNAMIC BUBBLE PRESSURE METHOD [J].
JOOS, P ;
FANG, JP ;
SERRIEN, G .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1992, 151 (01) :144-149
[8]   ADSORPTION-KINETICS OF SURFACTANTS AT FLUID INTERFACES [J].
MILLER, R ;
KRETZSCHMAR, G .
ADVANCES IN COLLOID AND INTERFACE SCIENCE, 1991, 37 (1-2) :97-121
[9]   MODEL FOR DIFFUSION-CONTROLLED ADSORPTION OF SURFACTANT MIXTURES AT LIQUID-PHASE BOUNDARIES [J].
MILLER, R ;
LUNKENHEIMER, K ;
KRETZSCHMAR, G .
COLLOID AND POLYMER SCIENCE, 1979, 257 (10) :1118-1120
[10]  
MILLER R, 1994, PROG COLL POL SCI S, V97, P188