Issue 11, 2009
From the journal:

Soft Matter

Deformation, restructuring, and un-jamming of concentrated droplets in large-amplitude oscillatory shear flows

Jung-Ren Huang*a  and  Thomas G. Mason*abc  

* Corresponding authors

a Department of Chemistry and Biochemistry, University of California—Los Angeles, Los Angeles, California 90095, USA
E-mail: jrhuang@chem.ucla.edu, mason@chem.ucla.edu

b Department of Physics and Astronomy, University of California—Los Angeles, Los Angeles, California 90095, USA

c California NanoSystems Institute, University of California—Los Angeles, Los Angeles, California 90095, USA

Abstract

We employ large-amplitude shear oscillation light scattering (SOLS) to study average droplet deformation and positional restructuring in concentrated uniform oil-in-water emulsions. Three dimensionless scattering intensity anisotropy factors, defined using the primary and secondary Bragg peaks, which can result from partial shear-induced ordering, reflect the phase-dependent droplet deformation and tilting. These factors distinguish the soft force-chain buckling regime, where shear disorders the droplets, from the sliding hexagonally-close-packed layer regime, where shear induces positional order. Near and above the jamming limit of spherical particles, the shear-induced structures depend sensitively on the droplet volume fraction and the shear history.

Graphical abstract: Deformation, restructuring, and un-jamming of concentrated droplets in large-amplitude oscillatory shear flows

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Article information

DOI
https://doi.org/10.1039/B822594J
Article type
Paper
Submitted
16 Dec 2008
Accepted
17 Mar 2009
First published
22 Apr 2009

Soft Matter, 2009,5, 2208-2214

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Deformation, restructuring, and un-jamming of concentrated droplets in large-amplitude oscillatory shear flows

J. Huang and T. G. Mason, Soft Matter, 2009, 5, 2208 DOI: 10.1039/B822594J

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