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AOT microemulsions: droplet size and clustering in the temperature range between the supercooled state and the upper phase boundary

Domschke, M. and Kraska, M. and Feile, R and Stühn, B. (2013):
AOT microemulsions: droplet size and clustering in the temperature range between the supercooled state and the upper phase boundary.
In: Soft Matter, The Royal Society of Chemistry, pp. 11503-11512, 9, [Online-Edition: http://dx.doi.org/10.1039/C3SM51632F],
[Article]

Abstract

The main focus of this work is the investigation of the mechanism of droplet aggregation and the droplet structure of water-AOT (sodium bis(2-ethyl hexyl) sulfosuccinate)-decane microemulsions between the supercooled state and the upper phase boundary by means of SAXS. We study the temperature dependent droplet structure and size in detail at compositions of droplet volume fractions curly or open phi = 0.1-0.4 and water/AOT molar ratios of omega = 5-40. We found a change in droplet size at varying temperatures and explain our results by the change of the effective droplet surface covered by an AOT molecule (between the two phase boundaries) and by macro-phase separated water ice below a certain supercooling temperature. We monitor the continuous change of droplet interaction by means of a phenomenological structure factor combining hard sphere interactions with a Lorentzian function accounting for droplet density fluctuations in the system. We analyse the droplet aggregates in dependency on phi omega leading to a better understanding of droplet aggregation with increasing temperature.

Item Type: Article
Erschienen: 2013
Creators: Domschke, M. and Kraska, M. and Feile, R and Stühn, B.
Title: AOT microemulsions: droplet size and clustering in the temperature range between the supercooled state and the upper phase boundary
Language: English
Abstract:

The main focus of this work is the investigation of the mechanism of droplet aggregation and the droplet structure of water-AOT (sodium bis(2-ethyl hexyl) sulfosuccinate)-decane microemulsions between the supercooled state and the upper phase boundary by means of SAXS. We study the temperature dependent droplet structure and size in detail at compositions of droplet volume fractions curly or open phi = 0.1-0.4 and water/AOT molar ratios of omega = 5-40. We found a change in droplet size at varying temperatures and explain our results by the change of the effective droplet surface covered by an AOT molecule (between the two phase boundaries) and by macro-phase separated water ice below a certain supercooling temperature. We monitor the continuous change of droplet interaction by means of a phenomenological structure factor combining hard sphere interactions with a Lorentzian function accounting for droplet density fluctuations in the system. We analyse the droplet aggregates in dependency on phi omega leading to a better understanding of droplet aggregation with increasing temperature.

Journal or Publication Title: Soft Matter
Volume: 9
Publisher: The Royal Society of 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
Date Deposited: 21 Feb 2014 09:50
Official URL: http://dx.doi.org/10.1039/C3SM51632F
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