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Slow dynamics of thin nematic films in the presence of adsorbed nanoparticles

J. Chem. Phys. 122, 024703 (2005); doi:10.1063/1.1831253

Published 17 December 2004

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S. Grollau, O. Guzmán, N. L. Abbott, and J. J. de Pablo
Department of Chemical and Biological Engineering, University of Wisconsin, Madison, Wisconsin 53706-1619
Recent experiments indicate that liquid crystals can be used to optically report the presence of biomolecules adsorbed at solid surfaces. In this work, numerical simulations are used to investigate the effects of biological molecules, modeled as spherical particles, on the structure and dynamics of nematic ordering. In the absence of adsorbed particles, a nematic in contact with a substrate adopts a uniform orientational order, imposed by the boundary conditions at this surface. It is found that the relaxation to this uniform state is slowed down by the presence of a small number of adsorbed particles. However, beyond a critical concentration of adsorbed particles, the liquid crystal ceases to exhibit uniform orientational order at long times. At this concentration, the domain growth is characterized by a first regime where the average nematic domain size LD obeys the scaling law LD(t)~t1/2; at long times, a slow dynamics regime is attained for which LD tends to a finite value corresponding to a metastable state with a disordered texture. The results of simulations are consistent with experimental observations.©2005 American Institute of Physics.
History: Received 14 January 2004; accepted 21 October 2004; published 17 December 2004
Permalink: http://link.aip.org/link/?JCPSA6/122/024703/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.30.Hn
    Surface phenomena in liquid crystals including anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions
  • 68.15.+e
    Liquid thin films
  • 68.43.Fg
    Adsorbate structure (binding sites, geometry)
  • 87.15.By
    Structure and bonding of biomolecules
  • 61.46.+w
    Structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
  • YEAR: 2005

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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