Diffusivity and configurational entropy maxima in short range attractive colloids

We study tagged particle diffusion at large packing fractions, for a model of particles interacting with a generalized Lennard-Jones 2n-n potential, with large n. The resulting short range potential mimics interactions in colloidal systems. In agreement with previous calculations for short range potentials, we observe a diffusivity maximum as a function of temperature at constant density. By studying the temperature dependence of the configurational entropy which we evaluate with two different methods - we show that a configurational entropy maximum is observed at a temperature close to that of the diffusivity maximum. Our findings suggest a relation between the dynamics and number of distinct states for short range potentials. © 2005 IOP Publishing Ltd.

Published in:
Journal of Physics Condensed Matter, 17, 12, L113-L119
Other identifiers:
Scopus: 2-s2.0-16644394633
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Scopus: 2-s2.0-16644394633

 Record created 2010-01-27, last modified 2018-03-17

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