Diffusivity and configurational entropy maxima in short range attractive colloids

Details Diffusivity and configurational entropy maxima in short range attractive colloids Diffusivity and configurational entropy maxima in short range attractive colloids

2004-04-25

arxiv.org/abs/cond-mat/0404604v1

J. Phys.: Condens. Matter 17 L113-L119 (2005)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, submited to Physical Review Letter

Scientific paper

10.1088/0953-8984/17/12/L02

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 potential, we observe a diffusivity maximum as a function of temperature. 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 relationbetween dynamics and number of distinct states for short-range potentials.

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