Microparticle manipulation using laser-induced thermophoresis and thermal convection flow

Qian, Y., Neale, S. L. and Marsh, J. H. (2020) Microparticle manipulation using laser-induced thermophoresis and thermal convection flow. Scientific Reports, 10, 19169. (doi: 10.1038/s41598-020-76209-9) (PMID:33154506) (PMCID:PMC7644619)

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Abstract

We demonstrate manipulation of microbeads with diameters from 1.5 to 10 µm and Jurkat cells within a thin fluidic device using the combined effect of thermophoresis and thermal convection. The heat flow is induced by localized absorption of laser light by a cluster of single walled carbon nanotubes, with no requirement for a treated substrate. Characterization of the system shows the speed of particle motion increases with optical power absorption and is also affected by particle size and corresponding particle suspension height within the fluid. Further analysis shows that the thermophoretic mobility (DT) is thermophobic in sign and increases linearly with particle diameter, reaching a value of 8 µm2 s−1 K−1 for a 10 µm polystyrene bead.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Neale, Dr Steven and Marsh, Professor John and Qian, Mr Yang
Authors: Qian, Y., Neale, S. L., and Marsh, J. H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Scientific Reports
Publisher:Nature Research
ISSN:2045-2322
ISSN (Online):2045-2322
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Scientific Reports 10: 19169
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
162182Micro-Actuators Controlled by Optoelectronic Tweezers (MACOET)Steven NealeRoyal Academy of Engineering (RAE)EP/G058393/1ENG - Biomedical Engineering