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Quenched disorder in a liquid-crystal biosensor: Adsorbed nanoparticles at confining walls

J. Chem. Phys. 122, 184711 (2005); doi:10.1063/1.1896354

Published 11 May 2005

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O. Guzmán, N. L. Abbott, and J. J. de Pablo
Department of Chemical and Biological Engineering, University of Wisconsin, Madison, Wisconsin 53706-1691
We analyze the response of a nematic liquid-crystal film, confined between parallel walls, to the presence of nanoscopic particles adsorbed at the walls. This is done for a variety of patterns of adsorption (random and periodic) and operational conditions of the system that can be controlled in experimental liquid-crystal-based devices. We compute simulated optical textures and the total optical output of the sensor between crossed polars, as well as the correlation function for the liquid-crystal tensor order parameter; we use these observables to discuss the gradual destruction of the original uniform orientation. For large concentrations of particles adsorbed in random patterns, the liquid crystal at the center of the sensor adopts a multidomain state, characterized by a small correlation length of the tensor order parameter, and also by a loss of optical anisotropy under observation through crossed polars. In contrast, for particles adsorbed in periodic patterns, the nematic at the center of the cell can remain in a monodomain orientation state, provided the patterns in opposite walls are synchronized. ©2005 American Institute of Physics
History: Received 3 November 2004; accepted 1 March 2005; published 11 May 2005
Permalink: http://link.aip.org/link/?JCPSA6/122/184711/1
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KEYWORDS and PACS

Keywords
PACS
  • 87.80.-y
    Biological techniques and instrumentation; biomedical engineering
  • 61.30.Hn
    Surface phenomena in liquid crystals including anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions
  • 68.43.Mn
    Adsorption/desorption kinetics
  • 61.30.Eb
    Experimental determinations of smectic, nematic, cholesteric, and other structures
  • 61.30.Gd
    Orientational order of liquid crystals in electric and magnetic fields
  • 68.15.+e
    Liquid thin films
  • YEAR: 2005

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (34)
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