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Changes in the bending modulus of AOT based microemulsions induced by the incorporation of polymers in the water core

Kuttich, Björn and Grefe, Ann-Kathrin and Stühn, B. (2016):
Changes in the bending modulus of AOT based microemulsions induced by the incorporation of polymers in the water core.
In: SOFT MATTER, ROYAL SOC CHEMISTRY, pp. 6400-6411, 12, (30), ISSN 1744-683X, [Article]

Abstract

The bending modulus k is known to be a crucial parameter for the stability of the droplet phase in microemulsion systems. For AOT based water in oil microemulsions the bending modulus of the surfactant has values close to kBT but can be influenced by the presence of polymers. In this work we focus on the water soluble polymer polyethylene glycol and how it influences the bending modulus. An increase by a factor of three is found. For the correct evaluation of the bending modulus via percolation temperatures and droplet radii, thus by dielectric spectroscopy and small angle X-ray scattering, the determination of the radii right at the percolation temperature is crucial as we will show, although it is often neglected. In order to precisely determine the droplet radii we will present a global fitting model which provides reliable results with a minimum number of free fitting parameters.

Item Type: Article
Erschienen: 2016
Creators: Kuttich, Björn and Grefe, Ann-Kathrin and Stühn, B.
Title: Changes in the bending modulus of AOT based microemulsions induced by the incorporation of polymers in the water core
Language: English
Abstract:

The bending modulus k is known to be a crucial parameter for the stability of the droplet phase in microemulsion systems. For AOT based water in oil microemulsions the bending modulus of the surfactant has values close to kBT but can be influenced by the presence of polymers. In this work we focus on the water soluble polymer polyethylene glycol and how it influences the bending modulus. An increase by a factor of three is found. For the correct evaluation of the bending modulus via percolation temperatures and droplet radii, thus by dielectric spectroscopy and small angle X-ray scattering, the determination of the radii right at the percolation temperature is crucial as we will show, although it is often neglected. In order to precisely determine the droplet radii we will present a global fitting model which provides reliable results with a minimum number of free fitting parameters.

Journal or Publication Title: SOFT MATTER
Volume: 12
Number: 30
Place of Publication: THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Publisher: ROYAL SOC CHEMISTRY
Divisions: 05 Department of Physics
05 Department of Physics > Institute for condensed matter physics
05 Department of Physics > Institute for condensed matter physics > Experimental Condensed Matter Physics
Event Location: THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Date Deposited: 30 Jan 2017 12:10
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