title: Dielectrophoretic and electrophoretic force analysis of colloidal fullerenes in a nematic liquid-crystal medium.
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.
authors.affiliation: Polymer Fusion Research Center, Department of Polymer-Nano Science and Engineering, Chonbuk National University, Chonju, Chonbuk 561-756, Korea.
authors.forename: Anoop Kumar
authors.initials: AK
authors.lastname: Srivastava
authors.forename: Miyoung
authors.initials: M
authors.lastname: Kim
authors.forename: Sung Min
authors.initials: SM
authors.lastname: Kim
authors.forename: Mi-Kyung
authors.initials: MK
authors.lastname: Kim
authors.forename: Kyu
authors.initials: K
authors.lastname: Lee
authors.forename: Young Hee
authors.initials: YH
authors.lastname: Lee
authors.forename: Myong-Hoon
authors.initials: MH
authors.lastname: Lee
authors.forename: Seung Hee
authors.initials: SH
authors.lastname: Lee
mesh_terms: D003102:Colloids / Q000737:chemistry* / Q000528:radiation effects*; D003198:Computer Simulation; D004574:Electromagnetic Fields; D004586:Electrophoresis / Q000379:methods; D037741:Fullerenes / Q000737:chemistry* / Q000528:radiation effects*; D050866:Liquid Crystals / Q000737:chemistry* / Q000528:radiation effects*; D008956:Models, Chemical; D013314:Stress, Mechanical
chemical_list: D003102:Colloids; D037741:Fullerenes