Travelling-wave dipolophoresis: Levitation and electrorotation of janus nanoparticles

Touvia Miloh, Jacob Nagler

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number114
Pages (from-to)1-29
Number of pages29
JournalMicromachines
Volume12
Issue number2
DOIs
StatePublished - Feb 2021

Keywords

  • Dielectrophoresis
  • Dipolophoresis
  • Electrokinetics of metallodielectric Janus particles
  • Electrorotation
  • Induced-charge electrophoresis
  • Levitation and stability
  • Travelling waves and non-uniform fields

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