Hybrid pattern-forming systems

  • Talk

  • Prof
  • L.M. Pismen, Department of Chemical Engineering Technion,Israel Institute of Technology,Haifa
  • Oct. 10, 2003, 3 p.m.
  • Sala de Juntes, Ed. Mateu Orfila

The hybrid models combine short-scale Monte-Carlo computations of surface
structure with a mean-field treatment of rapidly diffusing species. They are
largely motivated by studies of patterns on catalytic surfaces. They are
observed at the scale of microns, but the pattern-forming mechanism lies in
surface phase transitions that involve nanoscale transport processes.

A down-to-earth hybrid model is the Ising model coupled with a long-range
diffusing inhibitor. It shows a variety of patterns resembling that of a
noisy FitzHugh-Nagumo model. More realistic computations, based on available
thermodynamic and kinetic data for Pt surfaces reproduce effects of
nanoscale surface restructuring and roughening, as well as of microscale
pattern formation.

Contact details:

Emilio Hernández-García
971 17 13 07
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