Issue 28, 2012
From the journal:

Soft Matter

Controlling the formation of particle-stabilized water-in-oil emulsions†

Philip N. Sturzenegger,*a   Urs T. Gonzenbach,a   S. Koltzenburgb  and  Ludwig J. Gaucklera  

* Corresponding authors

a ETH Zürich, Wolfgang-Pauli-Strasse 10, Zürich, Switzerland
E-mail: philip.sturzenegger@mat.ethz.ch
Fax: +41 44 632 11 32
Tel: +41 44 633 68 72

b BASF SE, GK/IK-B001, Ludwigshafen, Germany
Tel: +49 621 60 54330

Abstract

We apply the versatile method of in situ hydrophobization of aluminum oxide particles with short amphiphiles for the stabilization of water-in-toluene emulsions. We found that octyl gallate is an ideal surface modifier to adjust particle wetting properties in toluene. The most important parameters affecting the droplet size were investigated including particle size and wetting properties, particle concentration, emulsion composition, and shear rate. The median droplet size ranged between 2.6 and 80 μm in this study. The results are discussed to shed light on the underlying processes controlling the droplet size. It was found that emulsion formation is either rupture or coalescence controlled, which is in close analogy to the mechanisms reported for surfactant-stabilized emulsions.

Graphical abstract: Controlling the formation of particle-stabilized water-in-oil emulsions

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Article information

DOI
https://doi.org/10.1039/C2SM25176K
Article type
Paper
Submitted
24 Jan 2012
Accepted
20 May 2012
First published
15 Jun 2012

Soft Matter, 2012,8, 7471-7479

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Controlling the formation of particle-stabilized water-in-oil emulsions

P. N. Sturzenegger, U. T. Gonzenbach, S. Koltzenburg and L. J. Gauckler, Soft Matter, 2012, 8, 7471 DOI: 10.1039/C2SM25176K

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