Microfluidic Rheology of Soft Colloids above and below Jamming

K. N. Nordstrom, E. Verneuil, P. E. Arratia, A. Basu, Z. Zhang, A. G. Yodh, J. P. Gollub, and D. J. Durian
Phys. Rev. Lett. 105, 175701 – Published 21 October 2010
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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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  • Received 26 July 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.175701

© 2010 The American Physical Society

Authors & Affiliations

K. N. Nordstrom1, E. Verneuil1,2, P. E. Arratia1,3, A. Basu1, Z. Zhang1,2, A. G. Yodh1, J. P. Gollub1,4, and D. J. Durian1

  • 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
  • 2Complex Assemblies of Soft Matter, CNRS-Rhodia-UPenn UMI 3254, Bristol, Pennsylvania 19007, USA
  • 3Department of Mechanical Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
  • 4Department of Physics and Astronomy, Haverford College, Haverford, Pennsylvania 19041, USA

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Issue

Vol. 105, Iss. 17 — 22 October 2010

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