Shape and Size of Highly Concentrated Micelles in CTAB/NaSal Solutions by Small Angle Neutron Scattering (SANS)

被引：91

作者：

Das, Narayan Ch. ^{[1
]}

Cao, Hu ^{[1
]}

Kaiser, Helmut ^{[1
]}

Warren, Garfield T. ^{[4
]}

Gladden, Joseph R. ^{[2
,3
]}

Sokol, Paul E. ^{[1
,4
]}

机构：

[1] Indiana Univ, LENS, Ctr Explorat Energy & Matter, Bloomington, IN 47408 USA

[2] Univ Mississippi, Dept Phys & Astron, University, MS 38677 USA

[3] Univ Mississippi, Natl Ctr Phys Acoust, University, MS 38677 USA

[4] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

来源：

LANGMUIR | 2012年 / 28卷 / 33期

基金：

美国国家科学基金会;

关键词：

POLYMER-LIKE MICELLES; WORMLIKE MICELLES; CETYLTRIMETHYLAMMONIUM BROMIDE; ALKYLPYRIDINIUM SURFACTANTS; CATIONIC SURFACTANTS; SEMIDILUTE SOLUTIONS; AQUEOUS-SOLUTIONS; VISCOSITY; PHASE; WATER;

D O I：

10.1021/la2022598

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Highly concentrated micelles in CTAB/NaSal solutions with a fixed salt/surfactant ratio of 0.6 have been studied using Small Angle Neutron Scattering (SANS) as a function of temperature and concentration. A worm-like chain model analysis of the SANS data using a combination of a cylindrical form factors for the polydisperse micellar length, circular cross-sectional radius with Gaussian polydispersity, and the structure factor based on a random phase approximation (RPA) suggests that these micelle solutions have a worm-like micellar structure that is independent of the concentration and temperature. The size of the micelle decreases monotonically with increasing temperature and increases with concentration. These observations indicate that large micelles are formed at low temperature and begin to break up to form smaller micelles with increasing temperature.

引用

页码：11962 / 11968

页数：7

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