title: Controllable rotating behavior of individual dielectric microrod in a rotating electric field.
abstract: We report herein controllable rotating behavior of an individual dielectric microrod driven by a background rotating electric field. By disposing or removing structured floating microelectrode, the rigid rod suspended in electrolyte solution accordingly exhibits cofield or antifield rotating motion. In the absence of the ideally polarizable metal surface, the dielectric rod rotates opposite to propagation of electric field, with the measured rotating rate much larger than predicted by Maxwell-Wager interfacial polarization theory incorporating surface conduction of fixed bond charge. Surprisingly, with floating electrode embedded, a novel kind of cofield rotation mode occurs in the presence of induced double-layer polarization, due to the action of hydrodynamic torque from rotating induced-charge electroosmosis. This method of achieving switchable spin modes of dielectric particles would direct implications in constructing flexible electrokinetic framework for analyzing 3D profile of on-chip biomicrofluidic samples.
authors.affiliation: School of Electronics and Control Engineering, Chang'an University, Xi'an, Shaanxi, P. R. China.|School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, P. R. China.
authors.forename: Weiyu
authors.initials: W
authors.lastname: Liu
authors.affiliation: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, P. R. China.|State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, Heilongjiang, P. R. China.
authors.forename: Yukun
authors.initials: Y
authors.lastname: Ren
authors.affiliation: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, P. R. China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Tao
authors.affiliation: School of Electronics and Control Engineering, Chang'an University, Xi'an, Shaanxi, P. R. China.
authors.forename: Yanbo
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, P. R. China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Chen
mesh_terms: D003198:Computer Simulation; D004560:Electricity; D053841:Electroosmosis; D004586:Electrophoresis / Q000295:instrumentation / Q000379:methods; D046209:Electrophoresis, Microchip; D004867:Equipment Design; D008839:Microelectrodes; D046210:Microfluidic Analytical Techniques; D044085:Microfluidics / Q000379:methods*; D008962:Models, Theoretical; D012399:Rotation
keywords: Controllable rotation; Dielectric microrod; Dynamic flow stagnation line; Induced-charge electroosmosis; Rotating electric field