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Microparticle manipulation using laser-induced thermophoresis and thermal convection flow.

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 (D_T) 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.

SUBMITTER: Qian Y

PROVIDER: S-EPMC7644619 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Microparticle manipulation using laser-induced thermophoresis and thermal convection flow.

Qian Yang Y Neale Steven L SL Marsh John H JH

Scientific reports 20201105 1

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 corres ...[more]

PMID: 33154506

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