SURFACTANTS AND COSURFACTANTS IN LAMELLAR LIQUID-CRYSTALS AND ADSORBED ON SOLID-SURFACES .3. THE MODEL SYSTEM SODIUM DODECANOATE BENZYL ALCOHOL AND ALPHA-ALUMINA

被引:13
作者
RUTHS, M [1 ]
SJOBLOM, J [1 ]
BLOKHUS, AM [1 ]
机构
[1] UNIV BERGEN,DEPT CHEM,N-5007 BERGEN,NORWAY
关键词
D O I
10.1016/0021-9797(91)90103-F
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
The competitive adsorption of sodium dodecanoate and benzyl alcohol from aqueous solution onto solid α-alumina has been determined at 35°C without and with 0.05 M NaCl. The adsorption isotherm of the surfactant is found to pass through two plateau states under both bulk conditions. In electrolyte-free solutions the first adsorption plateau is in good agreement with monolayer packing of the surfactant (0.41 nm2), while the saturation value agrees with bilayer packing. Without added electrolyte, benzyl alcohol is found to occupy about 0.18 nm2 in the surfactant surface bilayers. In the presence of NaCl, a denser packing of both the surfactant and the alcohol is obtained. A parallel between molecular organization in lyotropic liquid crystalline D phases with a lamellar geometry and the adsorbed phase gives a good agreement. © 1991.
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页码:108 / 112
页数:5
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