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Article
Electrorotation of Colloidal Particles in Liquid Crystals
Physical Review E
  • Guangxun Liao
  • Ivan I. Smalyukh
  • J. R. Kelly
  • Oleg D. Lavrentovich, Kent State University - Kent Campus
  • Antal Jakli, Kent State University - Kent Campus
Publication Date
9-15-2005
Document Type
Article
DOI
10.1103/PhysRevE.72.031704
Keywords
  • smectic-A-phase,
  • microrheology,
  • shear
Disciplines
Abstract

We present the first observations of dc electric-field-induced rotational motion of finite particles in liquid crystals. We show that the electrorotation is essentially identical to the well-known Quincke rotation, which in liquid crystals triggers an additional translational motion at higher fields. In the smectic phase the translational motion is confined to the two-dimensional geometry of smectic layers, in contrast to the isotropic and nematic phases, where the particles can move in all three dimensions. We demonstrate that by a proper analysis of the electrorotation, one can determine the in-plane viscosity of smectic liquid crystals. This method needs only a small amount of material, does not require uniform alignment over large areas, and enables probing rheological properties locally.

Comments

Copyright 2005 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevE.72.031704

Citation Information
Guangxun Liao, Ivan I. Smalyukh, J. R. Kelly, Oleg D. Lavrentovich, et al.. "Electrorotation of Colloidal Particles in Liquid Crystals" Physical Review E Vol. 72 Iss. 3 (2005)
Available at: http://works.bepress.com/oleg_lavrentovich/46/