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Article
Colloidal Micromotor in Smectic a Liquid Crystal Driven by DC Electric Field
Soft Matter
  • Antal Jakli, Kent State University - Kent Campus
  • Bohdan Senyuk
  • Guangxun Liao
  • Oleg Lavrentovich, Kent State University
Publication Date
9-10-2008
Document Type
Article
DOI
10.1039/b807927g
Keywords
  • slow viscous motion,
  • sphere parallel,
  • shear-flow,
  • plane wall,
  • fluid
Disciplines
Abstract

Converting linear stimulus to rotation has endless examples in virtually all scales of the universe. One of the interesting examples is Quincke rotation, a spinning rotation of a dielectric sphere neutrally buoyant in an isotropic fluid caused by a unidirectional DC electric field. Recently Quincke rotation has been reported in liquid crystalline (LC) phases, and it was noted that spinning triggers a translational motion normal to the electric field and the rotation axis. In this work, we explain the translation of spinning spheres as a result of hydrodynamic interaction with the bounding walls. We also describe a unique orbiting motion: the spinning particles circumnavigate air inclusions in the liquid crystal. The effect is caused by an elastic entrapment of the spheres at tilted grain boundaries in the meniscus region in the smectic phase. This phenomenon can offer new types of microfluidic devices and micromotors.

Comments

Available on publisher's site at http://dx.doi.org/10.1039/b807927g.

Citation Information
Antal Jakli, Bohdan Senyuk, Guangxun Liao and Oleg Lavrentovich. "Colloidal Micromotor in Smectic a Liquid Crystal Driven by DC Electric Field" Soft Matter Vol. 4 Iss. 12 (2008) p. 2471 - 2474
Available at: http://works.bepress.com/oleg_lavrentovich/48/