Departmental Papers (MEAM)

Document Type

Journal Article

Date of this Version

10-21-2010

Comments

Copyright American Physical Society. Reprinted from Physical Review Letters, Volume 105, Issue 17, Article 175701, October 2010, 4 pages.

Publisher URL: http://prl.aps.org/pdf/PRL/v105/i17/e175701

Abstract

The rheology near jamming of a suspension of soft colloidal spheres is studied using a custom microfluidic rheometer that provides the stress versus strain rate over many decades. We find non-Newtonian behavior below the jamming concentration and yield-stress behavior above it. The data may be collapsed onto two branches with critical scaling exponents that agree with expectations based on Hertzian contacts and viscous drag. These results support the conclusion that jamming is similar to a critical phase transition, but with interaction-dependent exponents.

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Date Posted: 26 October 2010

This document has been peer reviewed.