Cellular solid behaviour of liquid crystal colloids. 1. Phase separation and morphology

Details Cellular solid behaviour of liquid crystal colloids. 1. Phase separation and morphology Cellular solid behaviour of liquid crystal colloids. 1. Phase separation and morphology

2000-05-03

arxiv.org/abs/cond-mat/0005079v1

Physics

Condensed Matter

Soft Condensed Matter

Latex 2e (EPJ style) EPS figures included (poor quality to comply with space limitations)

Scientific paper

We study the phase ordering colloids suspended in a thermotropic nematic liquid crystal below the clearing point Tni and the resulting aggregated structure. Small (150nm) PMMA particles are dispersed in a classical liquid crystal matrix, 5CB or MBBA. With the help of confocal microscopy we show that small colloid particles densely aggregate on thin interfaces surrounding large volumes of clean nematic liquid, thus forming an open cellular structure, with the characteristic size of 10-100 micron inversely proportional to the colloid concentration. A simple theoretical model, based on the Landau mean-field treatment, is developed to describe the continuous phase separation and the mechanism of cellular structure formation.

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