HIGH-FREQUENCY DIELECTRIC DISPERSIONS IN DILUTE WATER-IN-OIL MICROEMULSIONS

被引:10
作者
CAMETTI, C
CODASTEFANO, P
TARTAGLIA, P
机构
来源
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 1990年 / 94卷 / 12期
关键词
COLLOIDES; ELECTRICAL PROPERTIES; MICROEMULSIONS;
D O I
10.1002/bbpc.199000065
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
A set of measurements of the dielectric constant of a three-component microemulsion system sodium bis (2-ethylhexyl) sulfosuccinate-water-decane as a function of frequency (10(6) to 10(9) Hz) and temperature (5 to 35-degrees-C) and for two values of the volume fraction of the dispersed phase (0.025 and 0.050) has been made. The frequency dependence of the dielectric constant clearly shows a low-frequency dispersion and a high-frequency one, both describable in terms of a Cole-Cole type relaxation. The high-frequency dispersion is characterized by a relaxation time of the order of 10(-9) s and a dielectric increment of few units, both largely independent of temperature and composition. We try to identify the origin of the high-frequency dielectric dispersion and to relate it to the dynamics of the surfactant polar heads within the single droplet.
引用
收藏
页码:1499 / 1503
页数:5
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