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    12. Topological defects in nematic droplets of hard spherocylinders
    J. Dzubiella, M. Schmidt, and H. Löwen, Phys. Rev. E 62, 5081 (2000).
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    Abstract. Using computer simulations we investigate the microscopic structure of the singular director field within a nematic droplet. As a theoretical model for nematic liquid crystals we take hard spherocylinders. To induce an overall topological charge, the particles are either confined to a two-dimensional circular cavity with homeotropic boundary or to the surface of a three-dimensional sphere. Both systems exhibit half-integer topological point defects. The isotropic defect core has a radius of the order of one particle length and is surrounded by free-standing density oscillations. The effective interaction between two defects is investigated. All results should be experimentally observable in thin sheets of colloidal liquid crystals. [figures]

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    Liquid crystals

    For hard spherocylinders the bulk phase diagram (Ref.4), topological defects in nematic droplets [12], and the isotropic-nematic transition inside random sphere matrices [54] was considered.

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MS, 20 Apr 2009.