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Issue 26, 2015
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Dynamics and yielding of binary self-suspended nanoparticle fluids

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Abstract

Yielding and flow transitions in bi-disperse suspensions of particles are studied using a model system comprised of self-suspended spherical nanoparticles. An important feature of the materials is that the nanoparticles are uniformly dispersed in the absence of a solvent. Addition of larger particles to a suspension of smaller ones is found to soften the suspensions, and in the limit of large size disparities, completely fluidizes the material. We show that these behaviors coincide with a speeding-up of de-correlation dynamics of all particles in the suspensions and are accompanied by a reduction in the energy dissipated at the yielding transition. We discuss our findings in terms of ligand-mediated jamming and un-jamming of hairy particle suspensions.

Graphical abstract: Dynamics and yielding of binary self-suspended nanoparticle fluids

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Submitted
18 Mar 2015
Accepted
25 May 2015
First published
29 May 2015

Soft Matter, 2015,11, 5224-5234
Article type
Paper
Author version available

Dynamics and yielding of binary self-suspended nanoparticle fluids

A. Agrawal, H. Yu, S. Srivastava, S. Choudhury, S. Narayanan and L. A. Archer, Soft Matter, 2015, 11, 5224 DOI: 10.1039/C5SM00639B

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