The effect of surface active solutes on bubbles exposed to ultrasound |
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| Affiliation: | 1. Department of Physics, Korea University, Seoul 136-713, Republic of Korea;2. Department of Physics, Ewha Womans University, Seoul 120-750, Republic of Korea;3. Department of Physics and Division of Energy Systems Research, Ajou University, Suwon 443-749, Republic of Korea;1. Electroceramic Thin Films Group, EPFL – SCI-STI-PM, Station 12, Bâtiment MXD, 1015 Lausanne, Switzerland;2. Solar Energy and Buildings Physics Laboratory, EPFL – ENAC – IIC LESO-PB, Station 18, Bâtiment LE, 1015 Lausanne, Switzerland;1. Department of Physics, Faculty of Science, King Mongkut''s University of Technology Thonburi, Bangkok 10140, Thailand;2. Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA;3. Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA;4. Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand;1. Department of Maternal Fetal Medicine and Mount Sinai Hospital, Toronto ON;2. Department of Obstetrics and Gynaecology, University of Toronto, Toronto ON;3. Department of Medical Imaging and University Health Network, Toronto ON;4. Department of Medical Biophysics and Sunnybrook Research Institute, Toronto ON |
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| Abstract: | A review of the effects of a range of surface active solutes, aliphatic alcohols, alkyl amines, carboxylic acids and surfactants on bubbles exposed to ultrasound is presented. The solutes are shown to affect the phenomenon of sonoluminescence (SL) in quite a number of different ways. Ionic surfactants have a strong influence on interbubble interactions which at low concentrations (1 mM) results in an enhancement in SL. Alcohols and the neutral forms of the organic acids and amines induce SL quenching. The SL quenching is attributed to the formation and accumulation of decomposition products in the hot core of an oscillating bubble resulting from the evaporation of volatile solute adsorbed at the bubble interface. Some results are presented on the influence of low concentrations of alcohol on the SL generated from a single bubble and on the bubble dynamics, when exposed to ultrasound. These results add support to the interpretation given for solute-induced effects observed in multibubble systems. It is also shown that SL can be used as an internal light source to excite aromatic solutes that subsequently fluoresce, a process referred to as sonophotoluminescence. |
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