Journal
MICROMACHINES
Volume 12, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/mi12020114
Keywords
electrokinetics of metallodielectric Janus particles; dipolophoresis; dielectrophoresis; induced-charge electrophoresis; travelling waves and non-uniform fields; electrorotation; levitation and stability
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Funding
- BSF [168]
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A theoretical study was conducted on the hydrodynamic and electrokinetic response of metallic spherical polarized colloids and metallodielectic Janus particles under arbitrary non-uniform ambient electric fields. New expressions for dielectrophoretic and induced-charge electrophoretic forces and moments were derived and compared with existing solutions. The levitation problem of metallic and Janus particles near a powered electrode in a cylindrical pore was also analyzed.
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.
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