Paper Abstract and Keywords |
Presentation |
2011-11-24 14:00
Effect of surface active solutes to acoustic bubbles observed with high-speed camera Shota Deno, Pak-Kon Choi (Meiji Univ.) US2011-70 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
Intense ultrasound produces acoustic bubbles which repeat the oscillation of expansion and contraction. Surfactant molecules affect bubble dynamics such as a bubble coalescence when adsorbed with bubble/liquid interface. We observed a high-speed shadowgraph of acoustic bubbles in aqueous solutions of sodium dodecyl sulfate using a high speed camera with a speed of 1,000,000 fps. The experimental result of time evolution of bubble diameter showed that a surfactant-adsorbed bubble favors spherical oscillation. Histograms of maximum bubble diameter were obtained from the high-speed movies. The histograms measured at ultrasonic frequencies of 37, 87 and 123 kHz indicated that number of large- size bubble considerably decreased compared to the case in pure water and this tendency is marked at higher frequencies. The histograms measured at various SDS concentrations at 87 kHz showed that the decrease in large-size bubbles is significant at the concentration of 5 mM. These results are elucidated in terms of electrostatic repulsion force between charged bubbles, which inhibits bubble coalescence. The increase in rectified diffusion is also noticed in the histogram. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
Acoustic bubble / high-speed camera / surfactant / bubble coalescence / rectified diffusion / / / |
Reference Info. |
IEICE Tech. Rep., vol. 111, no. 311, US2011-70, pp. 27-30, Nov. 2011. |
Paper # |
US2011-70 |
Date of Issue |
2011-11-17 (US) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
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US2011-70 |
Conference Information |
Committee |
US |
Conference Date |
2011-11-24 - 2011-11-24 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Tokai Univ. |
Topics (in Japanese) |
(See Japanese page) |
Topics (in English) |
General |
Paper Information |
Registration To |
US |
Conference Code |
2011-11-US |
Language |
Japanese |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
Effect of surface active solutes to acoustic bubbles observed with high-speed camera |
Sub Title (in English) |
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Keyword(1) |
Acoustic bubble |
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high-speed camera |
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surfactant |
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bubble coalescence |
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rectified diffusion |
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1st Author's Name |
Shota Deno |
1st Author's Affiliation |
Meiji University (Meiji Univ.) |
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Pak-Kon Choi |
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Meiji University (Meiji Univ.) |
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Speaker |
Author-2 |
Date Time |
2011-11-24 14:00:00 |
Presentation Time |
25 minutes |
Registration for |
US |
Paper # |
US2011-70 |
Volume (vol) |
vol.111 |
Number (no) |
no.311 |
Page |
pp.27-30 |
#Pages |
4 |
Date of Issue |
2011-11-17 (US) |
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