Colloidal glasses under shear strain

M D Haw, Wilson Poon, P N Pusey, P Hebraud, F Lequeux

Research output: Contribution to journalArticlepeer-review

Abstract

We have studied the effects of oscillatory shear strain on the structure of a colloidal hard-sphere glass. By light scattering, we measure the kinetic development of ordered structures induced by shearing between parallel plates. Diffusing wave spectroscopy "echo" experiments show that for peak to peak oscillatory strain below around 30% the colloidal glass strains approximately reversibly. At higher strains a partly ordered structure develops, the kinetics of the ordering being strongly dependent on strain. Kinetic measurements demonstrate an ''induction" time for crystallization with a divergentlike behavior as strain decreases toward similar to 25-30 %. We compare the behavior of glassy samples with that of samples at lower volume fraction, where in equilibrium without shear the sample is fully (poly)crystalline. At the lower volume fraction, irreversible yielding is observed at lower strains. There appears some tendency for very high volume fraction glass samples to "fracture." Similar evidence of fracture is not observed at the lower volume fractions. [S1063-651X(98)01010-1].

Original languageEnglish
Pages (from-to)4673-4682
Number of pages10
JournalPhysical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
Volume58
Issue number4
DOIs
Publication statusPublished - Oct 1998

Keywords

  • HARD-SPHERE COLLOIDS
  • INDUCED ORDER
  • NEUTRON-SCATTERING
  • SUSPENSIONS
  • TRANSITION
  • CRYSTALLIZATION
  • DISPERSIONS
  • FLOW

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