Viscoelastic solutions formed by worm-like micelles of amine oxide surfactant

被引：55

作者：

Brinchi, L. ^{[1
]}

Germani, R. ^{[1
]}

Di Profio, P. ^{[1
]}

Marte, L. ^{[1
]}

Savelli, G. ^{[1
]}

Oda, R. ^{[2
]}

Berti, D. ^{[3
]}

机构：

[1] Univ Perugia, CEMIN, Dipartimento Chim, I-06123 Perugia, Italy

[2] Univ Bordeaux, UMR CNRS 5248, IECB, F-33607 Pessac, France

[3] Univ Firenze&CSGI, Dipartimento Chim, I-50019 Sesto Fiorentino, FI, Italy

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2010年 / 346卷 / 01期

关键词：

Surfactants; Worm-like micelles; Amine oxide; Viscoelasticity; Rheology; DYNAMIC LIGHT-SCATTERING; TOSILATE-WATER SYSTEM; CETYLTRIMETHYLAMMONIUM BROMIDE; RHEOLOGICAL PROPERTIES; AQUEOUS-SOLUTIONS; DETERGENT MOLECULES; SEMIDILUTE; BEHAVIOR; AGGREGATION; TRANSITION;

D O I：

10.1016/j.jcis.2010.02.035

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：

Formation and properties of viscoelastic wormlike aqueous micellar solutions of the zwitterionic surfactant p-dodecyloxybenzyldimethylamine oxide (pDoAO) were studied Semi-dilute aqueous solutions of pDoAO show a sharp increase in viscosity, which exceeds 160 cST for concentrations >50 mM, leading to viscoelastic solutions. Viscoelasticity relates to the surfactant charge type In fact this viscoelastic system reverses to fluid when acid is added (pH < 2), which changes the system to cationic Under acidic conditions the system resembles solutions of the similar cationic surfactant p-dodecyloxybenzyltrimethylammonium bromide, (pDoTABr) in terms of viscosity Properties of aqueous solutions of pDoAO were investigated by dynamic light scattering (DLS), rheology and small angle neutron scattering (SANS) Data support the idea that small micelles grow in length (wormlike or threadlike micelles) as surfactant concentration increases and viscoelastic solutions form as micelles become entangled The micellar diameter as calculated by different techniques is about 5 nm (C) 2010 Elsevier Inc. All rights reserved

引用

页码：100 / 106

页数：7

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