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Colloidal particles at a nematic-isotropic interface: Effects of confinement

The European Physical Journal E volume 20, pages 237–242 (2006)Cite this article

Abstract.

When captured by a flat nematic-isotropic interface, colloidal particles can be dragged by it. As a result spatially periodic structures may appear, with the period depending on particle mass, size, and interface velocity (J.L. West, A. Glushchenko, G.X. Liao, Y. Reznikov, D. Andrienko, M.P. Allen, Phys. Rev. E 66, 012702 (2002)). If liquid crystal is sandwiched between two substrates, the interface takes a wedge-like shape, accommodating the interface-substrate contact angle and minimizing the director distortions on its nematic side. Correspondingly, particles move along complex trajectories: they are first captured by the interface and then “glide” towards its vertex point. Our experiments quantify this scenario, and numerical minimization of the Landau-de Gennes free energy allows for a qualitative description of the interfacial structure and the drag force.

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Authors and Affiliations

  1. Liquid Crystal Institute, Kent State University, 44242, Kent, OH, USA

    J. L. West, K. Zhang & D. Andrienko

  2. University of Colorado at Colorado Springs, 80933, Colorado Springs, CO, USA

    A. Glushchenko

  3. Max-Plank Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany

    D. Andrienko

  4. Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569, Stuttgart, Germany

    M. Tasinkevych

  5. Institut für Theoretische und Angewandte Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569, Stuttgart, Germany

    M. Tasinkevych

  6. Institute of Physics, Prospect Nauky 46, 03039, Kyiv, Ukraine

    Y. Reznikov

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  1. J. L. West
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  2. K. Zhang
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  3. A. Glushchenko
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Correspondence to M. Tasinkevych.

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West, J.L., Zhang, K., Glushchenko, A. et al. Colloidal particles at a nematic-isotropic interface: Effects of confinement. Eur. Phys. J. E 20, 237–242 (2006). https://doi.org/10.1140/epje/i2006-10017-1

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  • DOI: https://doi.org/10.1140/epje/i2006-10017-1

PACS.

  • 61.30.Jf Defects in liquid crystals
  • 64.70.Md Transitions in liquid crystals
  • 82.70.-y Disperse systems; complex fluids