Shape of Dynamical Heterogeneities and Fractional Stokes-Einstein and Stokes-Einstein-Debye Relations in Quasi-Two-Dimensional Suspensions of Colloidal Ellipsoids

Chandan K. Mishra and Rajesh Ganapathy
Phys. Rev. Lett. 114, 198302 – Published 15 May 2015
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Abstract

We examine the influence of the shape of dynamical heterogeneities on the Stokes-Einstein (SE) and Stokes-Einstein-Debye (SED) relations in quasi-two-dimensional suspensions of colloidal ellipsoids. For ellipsoids with repulsive interactions, both SE and SED relations are violated at all area fractions. On approaching the glass transition, however, the extent to which this violation occurs changes beyond a crossover area fraction. Quite remarkably, we find that it is not just the presence of dynamical heterogeneities but their change in the shape from stringlike to compact that coincides with this crossover. On introducing a suitable short-range depletion attraction between the ellipsoids, associated with the lack of morphological evolution of dynamical heterogeneities, the extent to which the SE and SED relations are violated remains unchanged even for deep supercooling.

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  • Received 27 September 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.198302

© 2015 American Physical Society

Authors & Affiliations

Chandan K. Mishra1,*,† and Rajesh Ganapathy2,*,‡

  • 1Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
  • 2International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India

  • *To whom all correspondence should be addressed.
  • chandank@jncasr.ac.in
  • rajeshg@jncasr.ac.in

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Issue

Vol. 114, Iss. 19 — 15 May 2015

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