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Title: Photothermally controlled Marangoni flow around a micro bubble

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.

Authors:
; ; ;  [1]
  1. Department of Micro Engineering, Kyoto University, Kyoto daigaku-Katsura, Kyoto 615-8540 (Japan)
Publication Date:
OSTI Identifier:
22415204
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BUBBLES; DIELECTRIC MATERIALS; GOLD; LASERS; MICROSTRUCTURE; NANOPARTICLES; POLYSTYRENE; ROTATION; SILVER; SYMMETRY; TEMPERATURE GRADIENTS; THIN FILMS

Citation Formats

Namura, Kyoko, E-mail: namura.kyoko.57r@st.kyoto-u.ac.jp, Nakajima, Kaoru, Kimura, Kenji, and Suzuki, Motofumi. Photothermally controlled Marangoni flow around a micro bubble. United States: N. p., 2015. Web. doi:10.1063/1.4906929.
Namura, Kyoko, E-mail: namura.kyoko.57r@st.kyoto-u.ac.jp, Nakajima, Kaoru, Kimura, Kenji, & Suzuki, Motofumi. Photothermally controlled Marangoni flow around a micro bubble. United States. doi:10.1063/1.4906929.
Namura, Kyoko, E-mail: namura.kyoko.57r@st.kyoto-u.ac.jp, Nakajima, Kaoru, Kimura, Kenji, and Suzuki, Motofumi. Mon . "Photothermally controlled Marangoni flow around a micro bubble". United States. doi:10.1063/1.4906929.
@article{osti_22415204,
title = {Photothermally controlled Marangoni flow around a micro bubble},
author = {Namura, Kyoko, E-mail: namura.kyoko.57r@st.kyoto-u.ac.jp and Nakajima, Kaoru and Kimura, Kenji and Suzuki, Motofumi},
abstractNote = {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.},
doi = {10.1063/1.4906929},
journal = {Applied Physics Letters},
number = 4,
volume = 106,
place = {United States},
year = {Mon Jan 26 00:00:00 EST 2015},
month = {Mon Jan 26 00:00:00 EST 2015}
}