Premicelles and monomer exchange in aqueous surfactant solutions above and below the critical micelle concentration

被引：47
|
作者：
LeBard, David N. [1 ,2 ]
Levine, Benjamin G. [3 ]
DeVane, Russell [4 ]
Shinoda, Wataru [5 ]
Klein, Michael L. [1 ,2 ]
机构：
[1] Temple Univ, Inst Computat Mol Sci, Philadelphia, PA 19122 USA
[2] Temple Univ, Dept Chem, Philadelphia, PA 19122 USA
[3] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA
[4] Procter & Gamble Co, Cincinnati, OH 45253 USA
[5] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
来源：
CHEMICAL PHYSICS LETTERS | 2012年 / 522卷
基金：
美国国家科学基金会;
关键词：
SODIUM DODECYL-SULFATE; MOLECULAR-DYNAMICS SIMULATIONS; COARSE-GRAINED MODEL; WATER OIL INTERFACE; COMPUTER-SIMULATION; CONCENTRATION FLUCTUATIONS; MICELLIZATION; DETERGENTS; SYSTEMS; AGGREGATION;
D O I：
10.1016/j.cplett.2011.11.075
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：
Many unusual phenomena in surfactant solutions below the critical micelle concentration have been attributed to the existence of premicelles. Here we investigate the properties of premicelles in aqueous solutions of non-ionic surfactants surrounding the critical micelle concentration (CMC) using advanced computer simulations. The concentration of premicelles increases with total concentration up to the CMC, above which the concentrations of free monomers and premicelles remain nearly constant. Analysis shows premicellar structures ranging from spherical to chain-like. Monomer exchange kinetics are observed to depend strongly on the aggregate size, with premicelles exhibiting extremely short (1.3 ns) relaxation times relative to full sized micelles (72 ns). (C) 2011 Elsevier B. V. All rights reserved.
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页码：38 / 42
页数：5
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