Sonoluminescence and sonochemiluminescence from a microreactor

David Fernandez Rivas, M. Ashokkumar, T. Leong, K. Yasui, T. Tuziuti, S. Kentish, Detlef Lohse, Johannes G.E. Gardeniers

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Abstract

Micromachined pits on a substrate can be used to nucleate and stabilize microbubbles in a liquid exposed to an ultrasonic field. Under suitable conditions, the collapse of these bubbles can result in light emission (sonoluminescence, SL). Hydroxyl radicals (OH) generated during bubble collapse can react with luminol to produce light (sonochemiluminescence, SCL). SL and SCL intensities were recorded for several regimes related to the pressure amplitude (low and high acoustic power levels) at a given ultrasonic frequency (200 kHz) for pure water, and aqueous luminol and propanol solutions. Various arrangements of pits were studied, with the number of pits ranging from no pits (comparable to a classic ultrasound reactor), to three-pits. Where there was more than one pit present, in the high pressure regime the ejected microbubbles combined into linear (two-pits) or triangular (three-pits) bubble clouds (streamers). In all situations where a pit was present on the substrate, the SL was intensified and increased with the number of pits at both low and high power levels. For imaging SL emitting regions, Argon (Ar) saturated water was used under similar conditions. SL emission from aqueous propanol solution (50 mM) provided evidence of transient bubble cavitation. Solutions containing 0.1 mM luminol were also used to demonstrate the radical production by attaining the SCL emission regions.
Original languageEnglish
Pages (from-to)1252-1259
Number of pages8
JournalUltrasonics sonochemistry
Volume19
Issue number6
Early online date3 May 2012
DOIs
Publication statusPublished - Nov 2012

Keywords

  • IR-81005
  • METIS-285896

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