Temperature dependence of the surfactant film bending elasticity in a bicontinuous sugar surfactant based microemulsion: a quasielastic scattering study

Literature Information

Publication Date 2010-12-10
DOI 10.1039/C0CP02044C
Impact Factor 3.676
Authors

Stefan Wellert, Matthias Karg, Olaf Holderer, André Richardt, Thomas Hellweg


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Abstract

Currently, the design of microemulsions is focussed on the formulation of environmentally compatible systems formed by non-harmful amphiphiles and oils. The use of sugar-based surfactants allows the design of microemulsions where, instead of the temperature, the addition of short- or medium-chain alcohols tunes the curvature of the amphiphilic interface. In this work, the resulting temperature stability of a sugar surfactant and rapeseed methyl ester based bicontinuous microemulsion is exploited to study the influence of temperature variations on the bending elastic constant κ. Quasi-elastic scattering of light and neutrons is used to separate long-range collective motions and local thermally excited undulations of the interface. κ in units of kT is found to be independent of temperature over a wide range.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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