Microparticle manipulation using laser-induced thermophoresis and thermal convection flow

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,...

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Bibliographic Details
Published inScientific reports Vol. 10; no. 1; p. 19169
Main Authors Qian, Yang, Neale, Steven L, Marsh, John H
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 05.11.2020
Nature Publishing Group UK
Subjects
Convection
Humans
Lasers
Life sciences
Light
Microspheres
Nanotubes
Particle Size
Physical Phenomena
Polystyrene
Temperature
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Summary: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 (D ) is thermophobic in sign and increases linearly with particle diameter, reaching a value of 8 µm  s  K for a 10 µm polystyrene bead.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-76209-9