title: Affine and nonaffine motions in sheared polydisperse emulsions.
abstract: 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%).
authors: Department of Physics, Emory University, Atlanta, Georgia 30322, USA.
authors: J
authors: J
authors: Clara-Rahola
authors: Department of Physics, Emory University, Atlanta, Georgia 30322, USA.
authors: T A
authors: TA
authors: Brzinski
authors: Department of Physics, Emory University, Atlanta, Georgia 30322, USA.
authors: D
authors: D
authors: Semwogerere
authors: Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors: K
authors: K
authors: Feitosa
authors: Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors: J C
authors: JC
authors: Crocker
authors: School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
authors: J
authors: J
authors: Sato
authors: School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
authors: V
authors: V
authors: Breedveld
authors: Department of Physics, Emory University, Atlanta, Georgia 30322, USA.
authors: Eric R
authors: ER
authors: Weeks