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The interaction of colloidal particles with weak homeotropic anchoring energy in homogeneous nematic liquid crystal cells.

Authors
  • Kim, Sung-Jo
  • Kim, Jong-Hyun
Type
Published Article
Journal
Soft Matter
Publisher
The Royal Society of Chemistry
Publication Date
Apr 21, 2014
Volume
10
Issue
15
Pages
2664–2670
Identifiers
DOI: 10.1039/c3sm53092b
PMID: 24647470
Source
Medline
License
Unknown

Abstract

We have investigated interactions of colloidal particles with weak homeotropic anchoring energy in homogeneous nematic liquid crystal cells. Particle-wall and inter-particle interactions were observed experimentally and analyzed using typical dipole-dipole and quadrupole-quadrupole interactions, including substrate effects as the image charges. Both experimental results matched well with the calculated results for the effective particle radius reflecting the weak anchoring. The effective radius is reduced by the amount of extrapolation length than the actual particle radius. The effective radii of polyethylene micro-particles were reduced to a coefficient ζ (0.78 ≥ ζ ≥ 0.52) times the actual radius with anchoring coefficients in the range of 3.8 × 10(-6) to 1.4 × 10(-6) J m(-2). The anchoring energy of the particles is, therefore, a key component for explaining liquid crystal colloidal systems.

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