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SUMMARY:Unified study of glass and jamming rheology in soft particle syst
 ems - Peter Sollich\, Department of Mathematics\, King's College London
DTSTART:20130510T130000Z
DTEND:20130510T140000Z
UID:TALK44630@talks.cam.ac.uk
CONTACT:Alessio Zaccone
DESCRIPTION:We explore numerically the shear rheology of soft repulsive pa
 rticles at large volume fraction.\nThe interplay between viscous dissipati
 on and thermal motion results in multiple rheological regimes\nencompassin
 g Newtonian\, shear-thinning and yield stress regimes near the ‘colloida
 l’ glass transition\nwhen thermal fluctuations are important\, crossing
  over to qualitatively similar regimes near the\n‘jamming’ transition 
 when dissipation dominates. In the crossover regime\, glass and jamming se
 ctors\ncoexist and give complex flow curves. Although glass and jamming l
 imits are characterized by similar\nmacroscopic flow curves\, we show tha
 t they occur over distinct time and stress scales and correspond\nto disti
 nct microscopic dynamics. We propose a simple rheological model describing
  the glass to\njamming crossover in the flow curves\, and discuss the exp
 erimental implications of our results. Time permitting a systematic compar
 ison of the model to data for a number of paradigmatic experimental system
 s will be described.
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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