COALESCENCE AND SOLUBILIZATE EXCHANGE IN A CATIONIC 4-COMPONENT REVERSED MICELLAR SYSTEM

被引:85
作者
BOMMARIUS, AS
HOLZWARTH, JF
WANG, DIC
HATTON, TA
机构
[1] MIT,DEPT CHEM ENGN,CAMBRIDGE,MA 02139
[2] MAX PLANCK GESELL,FRITZ HABER INST,W-1000 BERLIN 33,GERMANY
关键词
D O I
10.1021/j100381a051
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
Molecules solubilized in the water pools of reversed micelles are redistributed over the micelles when they coalesce to form temporary dimers before breaking apart again. The rates of this solubilizate exchange have been determined for the four-component system dodecyltrimethylammonium chloride (DTAC)/hexanol/n-heptane/water by following suitable electron transfer indicator reactions using the continuous flow method with integrating observation (CFMIO). A population balance analysis incorporating distribution effects of probe molecules across micellar aggregates yielded solubilizate exchange rate constants of 106-107 (M·s)-1, 2-3 orders of magnitude lower than for molecular diffusion. The results are consistent with opening of the surfactant layer upon coalescence as the rate-determining step, random solubilization of the probe molecules, and proportional increase of rate constant with reversed micellar size. © 1990 American Chemical Society.
引用
收藏
页码:7232 / 7239
页数:8
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