A SMALL-ANGLE NEUTRON-SCATTERING STUDY OF INTERMICELLAR INTERACTIONS IN MICROEMULSIONS OF AOT, WATER, AND NEAR-CRITICAL PROPANE

被引:107
作者
KALER, EW
BILLMAN, JF
FULTON, JL
SMITH, RD
机构
[1] PACIFIC NW LAB, DEPT CHEM SCI, CHEM METHODS & SEPARAT GRP, RICHLAND, WA 99352 USA
[2] UNIV WASHINGTON, DEPT CHEM ENGN, SEATTLE, WA 98195 USA
[3] UNIV DELAWARE, DEPT CHEM ENGN, NEWARK, DE 19716 USA
关键词
D O I
10.1021/j100154a080
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
Small-angle neutron scattering (SANS) measurements of high-pressure solutions of propane/sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/D2O have demonstrated that a water-in-oil microemulsion phase can be formed in propane. The dispersed droplets are, within experimental error, the same size as those formed in conventional microemulsions at the same water-to-surfactant ratio, and the size does not depend on propane density. The interdroplet interaction potential was modeled as a hard-core repulsion augmented by a strong and extremely short range attraction. This model describes droplets whose hydrocarbon tails are strongly attractive to the hydrocarbon tails of adjacent droplets. The SANS fit shows that the magnitude of the tail-tail attractive interactions may be much stronger than the longer ranger van der Waals type attractive interactions between the water cores of the droplets. These findings confirm results of IR and UV-vis spectroscopic studies of near-critical and supercritical fluid microemulsions.
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页码:458 / 462
页数:5
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