Time-dependent NMR-velocimetry of a colloidal glass

S. A. Rogers, P. T. Callaghan

Research output: Contribution to journalArticle

Abstract

The time-dependent velocity profiles in a Couette geometry of a soft glass made of colloidal star polymers suspended in squalene is presented. A shearbanded structure, hinted at by conventional rheological methods, is unequivocally confirmed with the local shear-rate of the low shear-rate branch below the measurable threshold. The evolution of the extent of the 'zero-shear-band' band is tracked and found to follow a Gompertz-like growth. The effects of altering shear rate, waiting time and temperature on the Gompertz fit parameters are investigated and show, among other relations, that the growth rate of the zero-shear band is proportional to the inverse of the applied shear rate, the time taken to reach unit strain.

Original languageEnglish (US)
Pages (from-to)735-745
Number of pages11
JournalRheologica Acta
Volume48
Issue number7
DOIs
StatePublished - Jun 8 2009
Externally publishedYes

Keywords

  • Flow visualisation
  • Flow-sensitive viscosity
  • Shear-induced structure formation
  • Soft solids
  • Start-up experiment
  • Steady shear

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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