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

Kraska, M. and Domschke, M. and Stühn, B. (2013):
Concentration induced ordering of microemulsion droplets in bulk and near the liquid-air interface.
In: SOFT MATTER, pp. 3488-3496, 9, (13), [Online-Edition: http://dx.doi.org/10.1039/C3SM27516G],
[Article]

Abstract

The structure of the air interface of water-AOT (sodium bis(2-ethyl hexyl) sulfosuccinate)-decane microemulsions in the droplet phase with omega = 20, 30, 40 is studied in a range of compositions with droplet volume fractions of phi = 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 phi 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 phi-dependent local order as in the bulk, e.g. we found a droplet volume fraction induced ordering of droplets.

Item Type: Article
Erschienen: 2013
Creators: Kraska, M. and Domschke, M. and Stühn, B.
Title: Concentration induced ordering of microemulsion droplets in bulk and near the liquid-air interface
Language: English
Abstract:

The structure of the air interface of water-AOT (sodium bis(2-ethyl hexyl) sulfosuccinate)-decane microemulsions in the droplet phase with omega = 20, 30, 40 is studied in a range of compositions with droplet volume fractions of phi = 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 phi 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 phi-dependent local order as in the bulk, e.g. we found a droplet volume fraction induced ordering of droplets.

Journal or Publication Title: SOFT MATTER
Volume: 9
Number: 13
Divisions: 05 Department of Physics > Institute for condensed matter physics > Experimental Condensed Matter Physics
05 Department of Physics > Institute for condensed matter physics > Optische Festkörperspektroskopie
05 Department of Physics > Institute for condensed matter physics
05 Department of Physics
Date Deposited: 06 May 2013 06:52
Official URL: http://dx.doi.org/10.1039/C3SM27516G
Identification Number: doi:10.1039/c3sm27516g
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