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Investigating the microstructure of a yield-stress fluid by light scattering

David Lee1, Iris A. Gutowski1, Arthur E. Bailey2, Laurent Rubatat1,3, John R. de Bruyn4, and Barbara J. Frisken1,*

  • 1Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada, V5A 1S6
  • 2Scitech Instruments Inc., North Vancouver, British Columbia, Canada, V7J 2S5
  • 3IPREM/EPCP, Université de Pau et des Pays de l’Adour, F-64053 Pau, France
  • 4Department of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada, N6A 3K7

  • *frisken@sfu.ca
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Phys. Rev. E 83, 031401 – Published 10 March, 2011

DOI: https://doi.org/10.1103/PhysRevE.83.031401

Abstract

We report the results of an experimental study of the microstructure of dispersions of Carbopol ETD 2050, a model yield-stress fluid. Using two different light scattering instruments, measurements were made over three decades in scattering wave vector, from 0.02 to 25 μm−1. These measurements reveal microstructure characterized by two length scales: a longer length scale, 6 μm and larger, that depends on Carbopol concentration and the pH of the dispersion and a shorter length scale of approximately 400 nm that is independent of both sample concentration and pH. We relate these results to shear rheology measurement of the yield stress of these materials.

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Phys. Rev. E 83, 031401– Published 10 March, 2011
  • Received 15 November 2010

© 2011 American Physical Society

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