Photothermally controlled Marangoni flow around a micro bubble
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Abstract
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.
Journal
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- Applied Physics Letters
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Applied Physics Letters 106 (4), 2015-01-26
American Institute of Physics
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Details
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- CRID
- 1050564285755926912
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- NII Article ID
- 120005537677
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- NII Book ID
- AA00543431
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- ISSN
- 00036951
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- HANDLE
- 2433/193466
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles