A simple, optically induced electrokinetic method to concentrate and pattern nanoparticles

Williams, Stuart J, Kumar, Aloke, Green, Nicolas G and Wereley, Steven T (2009) A simple, optically induced electrokinetic method to concentrate and pattern nanoparticles. Nanoscale, 1, (1), 133-137. (doi:10.1039/B9NR00033J).


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We demonstrate an optically induced electrokinetic technique that continuously concentrates nanoparticles on the surface of a parallel plate electrode that is biased with an AC signal. A highly focused beam of near-infrared light (1064 nm) was applied, inducing an electrothermal microfluidic vortex that carried nanoparticles to its center where they were accumulated. This technique was demonstrated with 49 nm and 100 nm fluorescent polystyrene particles and characterized as a function of applied AC frequency and voltage. With this technique the location and shape of colloidal concentration was reconfigured by controlling the optical landscape, yielding dynamic control of the aggregation. Colloidal concentration was demonstrated with a plain parallel plate electrode configuration without the need of photoconductive materials or complex microfabrication procedures.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1039/B9NR00033J
ISSNs: 2040-3364 (print)
2040-3372 (electronic)
Related URLs:
Divisions : Faculty of Physical Sciences and Engineering > Electronics and Computer Science
ePrint ID: 271005
Accepted Date and Publication Date:
Date Deposited: 06 May 2010 11:04
Last Modified: 31 Mar 2016 14:17
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/271005

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