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Travelling-Wave Dipolophoresis: Levitation and Electrorotation of Janus Nanoparticles

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...

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Detalles Bibliográficos
Autores principales: Miloh, Touvia, Nagler, Jacob
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7910911/
https://www.ncbi.nlm.nih.gov/pubmed/33499203
http://dx.doi.org/10.3390/mi12020114
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author Miloh, Touvia
Nagler, Jacob
author_facet Miloh, Touvia
Nagler, Jacob
author_sort Miloh, Touvia
collection PubMed
description 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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spelling pubmed-79109112021-02-28 Travelling-Wave Dipolophoresis: Levitation and Electrorotation of Janus Nanoparticles Miloh, Touvia Nagler, Jacob Micromachines (Basel) Article 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. MDPI 2021-01-22 /pmc/articles/PMC7910911/ /pubmed/33499203 http://dx.doi.org/10.3390/mi12020114 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Miloh, Touvia
Nagler, Jacob
Travelling-Wave Dipolophoresis: Levitation and Electrorotation of Janus Nanoparticles
title Travelling-Wave Dipolophoresis: Levitation and Electrorotation of Janus Nanoparticles
title_full Travelling-Wave Dipolophoresis: Levitation and Electrorotation of Janus Nanoparticles
title_fullStr Travelling-Wave Dipolophoresis: Levitation and Electrorotation of Janus Nanoparticles
title_full_unstemmed Travelling-Wave Dipolophoresis: Levitation and Electrorotation of Janus Nanoparticles
title_short Travelling-Wave Dipolophoresis: Levitation and Electrorotation of Janus Nanoparticles
title_sort travelling-wave dipolophoresis: levitation and electrorotation of janus nanoparticles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7910911/
https://www.ncbi.nlm.nih.gov/pubmed/33499203
http://dx.doi.org/10.3390/mi12020114
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