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Issue 13, 2013
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Concentration induced ordering of microemulsion droplets in bulk and near the liquid–air interface

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Abstract

The structure of the air interface of water–AOT (sodium bis(2-ethyl hexyl) sulfosuccinate)–decane microemulsions in the droplet phase with ω = 20, 30, 40 is studied in a range of compositions with droplet volume fractions of ϕ = 0.2 to 0.7. A combination of small angle X-ray scattering (SAXS) and X-ray reflectometry (XR) reveals a detailed image of the morphology in the bulk and at the microemulsion–air interface. The structure of the volume is described in terms of effective structure factors to obtain the bulk droplet structure and correlations. With increasing droplet density ϕ the droplets remain unchanged in their size and show an increase in the local order. The reflectivity behaviour of the samples can be consistently explained by bulk small angle scattering and specular reflectivity at the surface. The microemulsion–air interface consists of droplets with the same ϕ-dependent local order as in the bulk, e.g. we found a droplet volume fraction induced ordering of droplets.

Graphical abstract: Concentration induced ordering of microemulsion droplets in bulk and near the liquid–air interface

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Article information


Submitted
01 Nov 2012
Accepted
24 Jan 2013
First published
14 Feb 2013

Soft Matter, 2013,9, 3488-3496
Article type
Paper

Concentration induced ordering of microemulsion droplets in bulk and near the liquid–air interface

M. Kraska, M. Domschke and B. Stühn, Soft Matter, 2013, 9, 3488
DOI: 10.1039/C3SM27516G

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