Columnar versus smectic order in systems of charged colloidal rods

Details Columnar versus smectic order in systems of charged colloidal rods Columnar versus smectic order in systems of charged colloidal rods

2007-03-27

arxiv.org/abs/cond-mat/0703707v1

Physics

Condensed Matter

Soft Condensed Matter

14 pages, 6 figures, to appear in J. Chem. Phys

Scientific paper

10.1063/1.2730819

We study the stability of inhomogeneous liquid crystalline states in systems of monodisperse, stiff, charged rods. By means of a bifurcation analysis applied to the Onsager free energy for charged rods in strongly nematic states, we investigate nematic-smectic and nematic-columnar instabilities as a function of the Debye screening length. While the nematic-smectic transition clearly pre-emts the nematic-columnar one in the regime of strong screening a marked stability of hexagonal columnar order is observed at larger screening lengths. The theoretical results are substantiated by Brownian dynamics computer simulation results based on the Yukawa-site model. Our findings connect to experiments on tobacco mosaic virus rods in particular but might be relevant for soft rod-like mesogens in strong external directional fields in general.

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