Affine and nonaffine motions in sheared polydisperse emulsions

We study dense and highly polydisperse emulsions at droplet volume fractions ϕ≥0.65. We apply oscillatory shear and observe droplet motion using confocal microscopy. The presence of droplets with sizes several times the mean size dramatically changes the motion of smaller droplets. Both affine and n...

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Bibliographic Details
Published in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2015-01, Vol.91 (1), p.010301-010301, Article 010301
Main Authors: Clara-Rahola, J, Brzinski, T A, Semwogerere, D, Feitosa, K, Crocker, J C, Sato, J, Breedveld, V, Weeks, Eric R
Format: Article
Language:English
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Summary:We study dense and highly polydisperse emulsions at droplet volume fractions ϕ≥0.65. We apply oscillatory shear and observe droplet motion using confocal microscopy. The presence of droplets with sizes several times the mean size dramatically changes the motion of smaller droplets. Both affine and nonaffine droplet motions are observed, with the more nonaffine motion exhibited by the smaller droplets which are pushed around by the larger droplets. Droplet motions are correlated over length scales from one to four times the mean droplet diameter, with larger length scales corresponding to higher strain amplitudes (up to strains of about 6%).
ISSN:1539-3755
1550-2376
DOI:10.1103/PhysRevE.91.010301