LETTER TO THE EDITOR: Diffusivity and configurational entropy maxima in short range attractive colloids
Abstract
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.
- Publication:
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Journal of Physics Condensed Matter
- Pub Date:
- March 2005
- DOI:
- 10.1088/0953-8984/17/12/L02
- arXiv:
- arXiv:cond-mat/0404604
- Bibcode:
- 2005JPCM...17L.113A
- Keywords:
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- Condensed Matter - Soft Condensed Matter
- E-Print:
- 4 pages, 3 figures, submited to Physical Review Letter