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Electrorotation of titanium microspheres

Electrorotation of titanium microspheres
Electrorotation of titanium microspheres
Electrorotation (ROT) data for solid titanium micrometer-sized spheres in an electrolyte are presented for three different ionic conductivities, over the frequency range of 10 Hz to 100 kHz. The direction of rotation was found to be opposite to the direction of rotation of the electric field vector (counterfield electrorotation), with a single rotation peak. The maximum rotation rate occurs at a frequency of the order of the reciprocal RC time constant for charging the particle double layer capacitance through the resistor of the electrolyte bulk. A model for the electrical torque acting on a metallic sphere is presented, using a constant phase element impedance to describe the metal/electrolyte interface. The titanium spheres are much denser than the electrolyte and rest on the bottom substrate. Therefore, the electrical and viscous torques near a wall are considered in the analysis. Good agreement is found between the predicted and measured rotational speed as a function of frequency. Theory shows that there is no effect of induced charge electroosmotic flow on the ROT, as observed experimentally.
ac electrokinetics, electrorotation, dielectrophoresis, metallic microparticles
0173-0835
979-986
Arcenegui, Juan J.
bfc61c9e-63af-41e6-9820-07e41521cf1a
Ramos, Antonio
511ab594-f312-45ce-b7ff-ef348fd9b559
García-Sánchez, Pablo
905183cb-9aa4-4e26-97b9-1917d762739d
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Arcenegui, Juan J.
bfc61c9e-63af-41e6-9820-07e41521cf1a
Ramos, Antonio
511ab594-f312-45ce-b7ff-ef348fd9b559
García-Sánchez, Pablo
905183cb-9aa4-4e26-97b9-1917d762739d
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174

Arcenegui, Juan J., Ramos, Antonio, García-Sánchez, Pablo and Morgan, Hywel (2013) Electrorotation of titanium microspheres. [in special issue: Dielectrophoresis 2013] Electrophoresis, 34 (7), 979-986. (PMID:23348799)

Record type: Article

Abstract

Electrorotation (ROT) data for solid titanium micrometer-sized spheres in an electrolyte are presented for three different ionic conductivities, over the frequency range of 10 Hz to 100 kHz. The direction of rotation was found to be opposite to the direction of rotation of the electric field vector (counterfield electrorotation), with a single rotation peak. The maximum rotation rate occurs at a frequency of the order of the reciprocal RC time constant for charging the particle double layer capacitance through the resistor of the electrolyte bulk. A model for the electrical torque acting on a metallic sphere is presented, using a constant phase element impedance to describe the metal/electrolyte interface. The titanium spheres are much denser than the electrolyte and rest on the bottom substrate. Therefore, the electrical and viscous torques near a wall are considered in the analysis. Good agreement is found between the predicted and measured rotational speed as a function of frequency. Theory shows that there is no effect of induced charge electroosmotic flow on the ROT, as observed experimentally.

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More information

e-pub ahead of print date: 11 March 2013
Published date: April 2013
Keywords: ac electrokinetics, electrorotation, dielectrophoresis, metallic microparticles
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 354458
URI: https://eprints.soton.ac.uk/id/eprint/354458
ISSN: 0173-0835
PURE UUID: 51279a63-c049-4e35-8194-9354fd15bb0b
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 15 Jul 2013 11:04
Last modified: 06 Jun 2018 12:45

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