Travelling-Wave Dipolophoresis: Levitation and Electrorotation of Janus Nanoparticles

Micromachines

Jacob Nagler¹  Touvia Miloh¹ 

[1] School of Mechanical Engineering, University of Tel-Aviv, Tel-Aviv 69978, Israel;

关键词: electrokinetics of metallodielectric Janus particles;    dipolophoresis;    dielectrophoresis;    induced-charge electrophoresis;    travelling waves and non-uniform fields;    electrorotation;   

DOI  :  10.3390/mi12020114

来源: DOAJ

【 摘 要 】

We present a theoretical study of the hydrodynamic and electrokinetic response of both metallic spherical polarized colloids as well as metallodielectic Janus particles, which are subjected to an arbitrary non-uniform ambient electric field (DC or AC forcing). The analysis is based on employing the linearized ‘standard’ model (Poisson–Nernst–Planck formulation) and on the assumptions of a ‘weak’ field and small Debye scale. In particular, we consider cases of linear and helical time-harmonic travelling-wave excitations and provide explicit expressions for the resulting dielectrophoretic and induced-charge electrophoretic forces and moments, exerted on freely suspended particles. The new analytic expressions thus derived for the linear and angular velocities of the initially uncharged polarizable particle are compared against some available solutions. We also analyze the levitation problem (including stability) of metallic and Janus particles placed in a cylindrical (insulating or conducting) pore near a powered electrode.

【 授权许可】

Unknown