Effective pair interactions between colloidal particles at a nematic-isotropic interface

Details Effective pair interactions between colloidal particles at a nematic-isotropic interface Effective pair interactions between colloidal particles at a nematic-isotropic interface

2005-01-24

arxiv.org/abs/cond-mat/0501573v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages. 7 figures

Scientific paper

The Landau-de Gennes free energy is used to study theoretically the interaction of parallel cylindrical colloidal particles trapped at a nematic-isotropic interface. We find that the effective interaction potential is non-monotonic. The corresponding force-distance curves exhibit jumps and hysteresis upon approach/separation due to the creation/annihilation of topological defects. Minimization results suggest a simple empirical pair potential for the effective colloid-colloid interaction at the interface. We propose that the interface-mediated interaction can play an important role in self-organization and clustering of colloidal particles at such interfaces.

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