IDEAL BEHAVIOR OF SODIUM ALKYL SULFATES AT VARIOUS INTERFACES . THERMODYNAMICS OF ADSORPTION AT OIL-WATER INTERFACE

被引:35
作者
GILLAP, WR
WEINER, ND
GIBALDI, M
机构
[1] College of Pharmaceutical Sciences, Columbia University, New York
关键词
D O I
10.1021/j100852a059
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
Adsorption of sodium decyl sulfate and sodium dodecyl sulfate has been studied at very high areas per molecule at the hydrocarbon-0.1 M NaCl interface for a homologous series of n-alkanes (C6-C16). Ideal gaseous behavior was observed in all systems studied. The chain length of the oil had no apparent effect on adsorption in the ideal region. The standard thermodynamic functions for adsorption at the dodecane-0.1 M NaCl interface were determined and evaluated. Based on comparisons of the data obtained for both air-water and hydrocarbon-water interfaces and on evaluation of the results in terms of the major forces involved in the adsorption process, it is suggested that sodium dodecyl sulfate dimers, which are present in the aqueous bulk, dissociate at the oil-water interface and that the monomer is the exclusive adsorbed species. The importance of hydrophobic bonding and entropy as a driving force to adsorption at the oil-water interface is discussed.
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页码:2222 / &
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