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Research Article

In Situ Determination of the Size and Polydispersity of Concentrated Emulsions

Catherine P. Whitby,^† Alex M. Djerdjev, James K. Beattie, and Gregory G. Warr*

School of Chemistry, The University of Sydney, NSW 2006, Australia

Langmuir, 2007, 23 (4), pp 1694–1700

DOI: 10.1021/la0624485

Publication Date (Web): December 23, 2006

†

Current address: Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095.

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

Abstract

Droplet size distributions of concentrated, polydisperse oil-in-water emulsions have been measured using ultra small angle neutron scattering (USANS). The mean radii calculated by fitting a model for polydisperse hard spheres with excluded volume interactions to the USANS data were consistent with those derived from electroacoustics on diluted emulsions after correction for conductance behind the shear plane. The Porod radii measured by USANS were similarly consistent with the mean surface-area-weighted radii derived from electroacoustics, irrespective of the drop concentration or polydispersity.

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