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Electrorotation of metallic microspheres

Electrorotation of metallic microspheres
Electrorotation of metallic microspheres
Electrorotation (ER) experiments of gold-coated micrometer-sized spheres suspended in an electrolyte are presented for three different ionic conductivities over the frequency range of 100 Hz to 40 MHz. The direction of rotation was observed to be counter-field (opposite to the rotating field vector) with a single rotation peak. The maximum in rotation occurs for a frequency on the order of the reciprocal RC time constant for charging the double layer at the gold surface. Dielectrophoresis (DEP) experiments showed that the gold-coated particles undergo negative DEP at low frequencies and positive DEP at high frequencies with the same relaxation frequency as electrorotation. No induced charge electrophoresis was noticeable in ER or DEP experiments.
0743-7463
2128-2131
Ren, Yu K.
1cc11f99-db87-4a37-ad00-9063aecd8461
Morganti, Diego
fc686842-103c-477e-9a4c-926d86c30d78
Jiang, Hong Y.
683ff8b8-ebfc-48b3-b384-49c3a6f757d3
Ramos, Antonio
511ab594-f312-45ce-b7ff-ef348fd9b559
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Ren, Yu K.
1cc11f99-db87-4a37-ad00-9063aecd8461
Morganti, Diego
fc686842-103c-477e-9a4c-926d86c30d78
Jiang, Hong Y.
683ff8b8-ebfc-48b3-b384-49c3a6f757d3
Ramos, Antonio
511ab594-f312-45ce-b7ff-ef348fd9b559
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174

Ren, Yu K., Morganti, Diego, Jiang, Hong Y., Ramos, Antonio and Morgan, Hywel (2011) Electrorotation of metallic microspheres. Langmuir, 27 (6), 2128-2131. (doi:10.1021/la104784m).

Record type: Article

Abstract

Electrorotation (ER) experiments of gold-coated micrometer-sized spheres suspended in an electrolyte are presented for three different ionic conductivities over the frequency range of 100 Hz to 40 MHz. The direction of rotation was observed to be counter-field (opposite to the rotating field vector) with a single rotation peak. The maximum in rotation occurs for a frequency on the order of the reciprocal RC time constant for charging the double layer at the gold surface. Dielectrophoresis (DEP) experiments showed that the gold-coated particles undergo negative DEP at low frequencies and positive DEP at high frequencies with the same relaxation frequency as electrorotation. No induced charge electrophoresis was noticeable in ER or DEP experiments.

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More information

Published date: 8 February 2011
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 354677
URI: https://eprints.soton.ac.uk/id/eprint/354677
ISSN: 0743-7463
PURE UUID: cf3408ae-3df2-458c-b3ad-33cc47198638
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 17 Jul 2013 15:38
Last modified: 10 Sep 2019 00:45

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