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

被引：92

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

共 38 条

[1] Concentration fluctuations in CTAB/NaSal solutions [J].

Amin, S ;

Kermis, TW ;

van Zanten, RM ;

Dees, SJ ;

van Zanten, JH .

LANGMUIR, 2001, 17 (26) :8055-8061

[2] Small-angle neutron scattering study of the growth behavior, flexibility, and intermicellar interactions of wormlike SDS micelles in NaBr aqueous solutions [J].

Arleth, L ;

Bergström, M ;

Pedersen, JS .

LANGMUIR, 2002, 18 (14) :5343-5353

[3] Small-angle neutron-scattering and viscosity studies of CTAB/NaSal viscoelastic micellar solutions [J].

Aswal, VK ;

Goyal, PS ;

Thiyagarajan, P .

JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (14) :2469-2473

[4] Self-oscillations of a cusped bubble rising through a micellar solution [J].

Belmonte, A .

RHEOLOGICA ACTA, 2000, 39 (06) :554-559

[5] Structural behaviour of mixed cationic surfactant micelles: A small-angle neutron scattering study [J].

Bergstroem, L. Magnus ;

Garamus, Vasil M. .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2012, 381 :89-99

[6]

Berret JF, 2006, MOLECULAR GELS: MATERIALS WITH SELF-ASSEMBLED FIBRILLAR NETWORKS, P667, DOI 10.1007/1-4020-3689-2_20

[7] Effect of counterions on properties of micelles formed by alkylpyridinium surfactants .1. Conductometry and H-1-NMR chemical shifts [J].

Bijma, K ;

Engberts, JBFN .

LANGMUIR, 1997, 13 (18) :4843-4849

[8] Effect of counterions and headgroup hydrophobicity on properties of micelles formed by alkylpyridinium surfactants. 2. Microcalorimetry [J].

Bijma, K ;

Blandamer, MJ ;

Engberts, JBFN .

LANGMUIR, 1998, 14 (01) :79-83

[9] RHEOLOGICAL PROPERTIES OF SEMIDILUTE AND CONCENTRATED AQUEOUS-SOLUTIONS OF CETYLTRIMETHYLAMMONIUM BROMIDE IN THE PRESENCE OF POTASSIUM-BROMIDE [J].

CANDAU, SJ ;

HIRSCH, E ;

ZANA, R ;

DELSANTI, M .

LANGMUIR, 1989, 5 (05) :1225-1229

[10] SOLUTION PHASE WITH REVERSED MICELLES IN CETYL TRIMETHYLAMMONIUM BROMIDE-HEXANOL-WATER SYSTEM [J].

EKWALL, P ;

MANDELL, L ;

SOLYOM, P .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1971, 35 (02) :266-&

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