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Dielectrophoretic and electrophoretic force analysis of colloidal fullerenes in a nematic liquid-crystal medium

Anoop Kumar Srivastava1, Miyoung Kim1, Sung Min Kim1, Mi-Kyung Kim1, Kyu Lee2, Young Hee Lee2,*, Myong-Hoon Lee1, and Seung Hee Lee1,†

  • 1Polymer Fusion Research Center, Department of Polymer-Nano Science and Engineering, Chonbuk National University, Chonju, Chonbuk 561-756, Korea
  • 2Department of Physics and Department of Energy Science, Center for Nanotubes and Nanostructured Composites, Sungkyunkwan University, Suwon 440-746, Korea

  • *leeyoung@skku.edu
  • †lsh1@chonbuk.ac.kr
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Phys. Rev. E 80, 051702 – Published 16 November, 2009

DOI: https://doi.org/10.1103/PhysRevE.80.051702

Abstract

This research focuses on the electrokinetic motion of fullerenes suspended in liquid crystal host medium, which are investigated in the homogeneously aligned nematic liquid crystal cells driven by in-plane field. We investigated the effect of electrophoretic and dielectrophoretic forces and related parameters of the colloidal fullerenes in liquid crystals. The electrophoretic mobility, zeta potential, and critical voltage have been evaluated. Fullerenes suspended in liquid crystal medium migrated toward the positive electrode, but were pulled back in the opposite direction when the polarity was reversed especially at low frequency range (<5 Hz). At higher electric field and higher frequency ranges, the net displacement of fullerenes has been observed. We demonstrate that the dielectrophoretic force dominated the motion in the colloidal fullerenes by a proper analysis of different electrophoretic parameters. In addition, the electrodynamics of fullerenes was explained by applying the theory of the dielectrophoresis and Schwarz’s formula. We propose a model to estimate the density of fullerenes suspended in liquid crystal medium.

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Outline

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Phys. Rev. E 80, 051702– Published 16 November, 2009
  • Received 5 June 2009

© 2009 American Physical Society

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