Orientation-dependent depletion interaction in rodlike colloid-polymer mixtures |
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Authors: | A. Matsuyama T. Kato |
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Affiliation: | (1) Department of Chemistry for Materials, Faculty of Engineering, Mie University, Tsu Mie 514-8507, Japan, JP |
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Abstract: | Depletion interaction in a suspension of rodlike colloids with added non-adsorbing polymer coils is theoretically studied. We calculate an overlap volume of depletion zone between two rodlike colloids, based on the second virial approximation. We examine nematic-isotropic phase transition (NIT) and two-phase coexistence between an isotropic and a nematic phase at low polymer concentrations. We find that the depletion interaction is dependent on the orientational order parameter of rodlike colloids and leads to a decrease in the NIT concentration on the addition of polymer. The coexistence curves have a leaning-chimney shape and are shifted to lower rod concentrations on increasing the polymer concentration. Received 23 May 2001 and Received in final form 18 July 2001 |
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Keywords: | PACS. 61.30.-v Liquid crystals – 61.30.St Lyotropic phases – 82.70.Dd Colloids |
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