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Optically induced electrokinetic concentration and sorting of colloids

Optically induced electrokinetic concentration and sorting of colloids
Optically induced electrokinetic concentration and sorting of colloids
We demonstrate an optically induced ac electrokinetic technique that rapidly and continuously accumulates colloids on a parallel-plate electrode surface resulting in a crystalline-like aggregation. Electrothermal hydrodynamics produce a microfluidic vortex that carries suspended particles toward its center where they are trapped by local ac electrokinetic hydrodynamic forces. We characterize the rate of particle aggregation as a function of the applied ac voltage, ac frequency and illumination intensity. Hundreds of polystyrene particles (1.0 mu m) suspended in a low conductivity solution (2.4 mS m(-1)) were captured at a range of voltages (5-20 V-pp) and frequencies (20-150 kHz) with an optical power of approximately 20 mW. This technique was not restricted to near infrared (1064 nm) illumination and was also demonstrated at 532 nm. The sorting capability of this technique was demonstrated with a solution containing 0.5 mu m, 1.0 mu m and 2.0 mu m polystyrene particles. This dynamic optically induced technique rapidly concentrates, sorts and translates colloidal aggregates with a simple parallel-plate electrode configuration and can be used for a variety of lab-on-a-chip applications.
INDUCED FLUID-FLOW, FREQUENCY DIELECTRIC DISPERSION, ELECTRIC-FIELD, ELECTROLYTE SOLUTION, SINGLE CELLS, PARTICLES, LASER, MANIPULATION, TWEEZERS, CRYSTALS
0960-1317
Williams, Stuart J
a737262a-289a-42ab-bb5b-777571ff6203
Kumar, Aloke
8e9992d8-c15e-456c-91ca-e78cd39f553b
Green, Nicolas G
d9b47269-c426-41fd-a41d-5f4579faa581
Wereley, Steven T
b80225dd-e66c-4d34-9317-fcaf48e94677
Williams, Stuart J
a737262a-289a-42ab-bb5b-777571ff6203
Kumar, Aloke
8e9992d8-c15e-456c-91ca-e78cd39f553b
Green, Nicolas G
d9b47269-c426-41fd-a41d-5f4579faa581
Wereley, Steven T
b80225dd-e66c-4d34-9317-fcaf48e94677

Williams, Stuart J, Kumar, Aloke, Green, Nicolas G and Wereley, Steven T (2010) Optically induced electrokinetic concentration and sorting of colloids Journal of Micromechanics and Microengineering, 20, (1) (doi:10.1088/0960-1317/20/1/015022).

Record type: Article

Abstract

We demonstrate an optically induced ac electrokinetic technique that rapidly and continuously accumulates colloids on a parallel-plate electrode surface resulting in a crystalline-like aggregation. Electrothermal hydrodynamics produce a microfluidic vortex that carries suspended particles toward its center where they are trapped by local ac electrokinetic hydrodynamic forces. We characterize the rate of particle aggregation as a function of the applied ac voltage, ac frequency and illumination intensity. Hundreds of polystyrene particles (1.0 mu m) suspended in a low conductivity solution (2.4 mS m(-1)) were captured at a range of voltages (5-20 V-pp) and frequencies (20-150 kHz) with an optical power of approximately 20 mW. This technique was not restricted to near infrared (1064 nm) illumination and was also demonstrated at 532 nm. The sorting capability of this technique was demonstrated with a solution containing 0.5 mu m, 1.0 mu m and 2.0 mu m polystyrene particles. This dynamic optically induced technique rapidly concentrates, sorts and translates colloidal aggregates with a simple parallel-plate electrode configuration and can be used for a variety of lab-on-a-chip applications.

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More information

Published date: January 2010
Additional Information: Imported from ISI Web of Science
Keywords: INDUCED FLUID-FLOW, FREQUENCY DIELECTRIC DISPERSION, ELECTRIC-FIELD, ELECTROLYTE SOLUTION, SINGLE CELLS, PARTICLES, LASER, MANIPULATION, TWEEZERS, CRYSTALS
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 270719
URI: http://eprints.soton.ac.uk/id/eprint/270719
ISSN: 0960-1317
PURE UUID: 9b1b0834-3651-4c61-9991-8191c6634fd9
ORCID for Nicolas G Green: ORCID iD orcid.org/0000-0001-9230-4455

Catalogue record

Date deposited: 21 Apr 2010 07:46
Last modified: 24 Jul 2017 16:40

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Contributors

Author: Stuart J Williams
Author: Aloke Kumar
Author: Nicolas G Green ORCID iD
Author: Steven T Wereley

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