Slip and Flow of Hard-Sphere Colloidal Glasses

P. Ballesta, R. Besseling, L. Isa, G. Petekidis, Wilson Poon

Research output: Contribution to journalArticlepeer-review

Abstract

We study the flow of concentrated hard-sphere colloidal suspensions along smooth, nonstick walls using cone-plate rheometry and simultaneous confocal microscopy. In the glass regime, the global flow shows a transition from Herschel-Bulkley behavior at large shear rate to a characteristic Bingham slip response at small rates, absent for ergodic colloidal fluids. Imaging reveals both the "solid" microstructure during full slip and the local nature of the "slip to shear" transition. Both the local and global flow are described by a phenomenological model, and the associated Bingham slip parameters exhibit characteristic scaling with size and concentration of the hard spheres.

Original languageEnglish
Article number258301
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Volume101
Issue number25
DOIs
Publication statusPublished - 19 Dec 2008

Keywords

  • DYNAMIC LIGHT-SCATTERING
  • SHEARED COMPLEX FLUIDS
  • WALL-SLIP
  • CONCENTRATED SUSPENSIONS
  • RHEOLOGY
  • EMULSIONS
  • PARALLEL
  • VISCOMETERS
  • VELOCIMETRY
  • PARTICLES

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