期刊
ULTRASONICS SONOCHEMISTRY
卷 20, 期 1, 页码 510-524出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2012.07.024
关键词
Radicals; Sonochemistry; Ultrasound; Microfabrication; Bubbles
资金
- Technology Foundation STW
- Applied Science Division of NWO
- Technology Programme of the Ministry of Economic Affairs, The Netherlands
We describe the ejection of bubbles from air-filled pits micromachined on a silicon surface when exposed to ultrasound at a frequency of approximately 200 kHz. As the pressure amplitude is increased the bubbles ejected from the micropits tend to be larger and they interact in complex ways. With more than one pit, there is a threshold pressure beyond which the bubbles follow a trajectory parallel to the substrate surface and converge at the center point of the pit array. We have determined the size distribution of bubbles ejected from one, two and three pits, for three different pressure amplitudes and correlated them with sonochemical OK radical production. Experimental evidence of shock wave emission from the bubble clusters, deformed bubble shapes and jetting events that might lead to surface erosion are presented. We describe numerical simulations of sonochemical conversion using the empirical bubble size distributions, and compare the calculated values with experimental results. (C) 2012 Elsevier B.V. All rights reserved.
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