Photothermally controlled Marangoni flow around a micro bubble

We have experimentally investigated the control of Marangoni flow around a micro bubble using photothermal conversion. Using a focused laser spot acting as a highly localized heat source on Au nanoparticles/dielectric/Ag mirror thin film enables us to create a micro bubble and to control the tempera...

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Veröffentlicht in:Applied physics letters 2015-01, Vol.106 (4)
Hauptverfasser: Namura, Kyoko, Nakajima, Kaoru, Kimura, Kenji, Suzuki, Motofumi
Format: Artikel
Sprache:eng
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Zusammenfassung:We have experimentally investigated the control of Marangoni flow around a micro bubble using photothermal conversion. Using a focused laser spot acting as a highly localized heat source on Au nanoparticles/dielectric/Ag mirror thin film enables us to create a micro bubble and to control the temperature gradient around the bubble at a micrometer scale. When we irradiate the laser next to the bubble, a strong main flow towards the bubble and two symmetric rotation flows on either side of it develop. The shape of this rotation flow shows a significant transformation depending on the relative position of the bubble and the laser spot. Using this controllable rotation flow, we have demonstrated sorting of the polystyrene spheres with diameters of 2 μm and 0.75 μm according to their size.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4906929