Phase behavior and microstructure evolution in aqueous mixtures of cetyltrimethylammonium bromide and sodium dodecyl tri-oxyethylene sulfate - 09/02/09

Doi : 10.1016/j.crci.2008.08.009

P.A. Hassan ^a, Travis K. Hodgdon ^b, Masanobu Sagasaki ^c, Gerhard Fritz-Popovski ^d, Eric W. Kaler ^b,^e,^⁎
^a Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
^b Department of Chemical Engineering, University of Delaware, Newark, DE 19716, USA
^c Faculty of Science and Technology, Science University of Tokyo, Yamazaki, Chiba 278-8501, Japan
^d Institute of Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
^e Departments of Materials Science and Chemistry, Stony Brook University, Stony Brook, NY 11794, USA

Corresponding author. Departments of Materials Science and Chemistry, Stony Brook University, Stony Brook, NY 11794, USA.

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Abstract

The phase behavior and microstructural changes in aqueous mixtures of cetyltrimethylammonium bromide (CTAB) and sodium dodecyl tri-oxyethylene sulfate (C₁₂E₃S) are reported. The mixing behavior of the two surfactants is investigated via surface tension measurements and the regular solution approximation yielded a β value of −13, indicating attractive interaction. The difference in the growth behavior of the micelles on the CTAB-rich and C₁₂E₃S-rich sides of the phase diagram is studied using viscosity, quasielastic light scattering, small angle neutron scattering, and cryogenic transmission electron microscopy (cryoTEM). Branched micelles are formed close to the phase boundary and are more prevalent in CTAB-rich micelles. A shear-induced transition of cylindrical to ribbon-like micelles is observed by cryoTEM in CTAB-rich micelles near the phase boundary. A temperature-induced phase transition is observed for C₁₂E₃S-rich micelles due to the dehydration and/or conformational changes of the hydrophilic oxyethylene part of C₁₂E₃S in the mixed micelles.

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Keywords : Worm-like micelles, Micellar branching, Neutron scattering, Light scattering, Cryogenic transmission electron microscopy

Plan

Introduction

Materials and methods

Results and discussion

Aggregation behavior

Phase behavior

Structural studies

Effect of temperature

Conclusions

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Vol 12 - N° 1-2

P. 18-29 - janvier 2009 Retour au numéro

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Phase behavior and microstructure evolution in aqueous mixtures of cetyltrimethylammonium bromide and sodium dodecyl tri-oxyethylene sulfate - 09/02/09

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