A Comparison between Multibubble Sonoluminescence Intensity and the Temperature within Cavitation Bubbles

• Published in: Journal of the American Chemical Society Vol. 127; no. 15; pp. 5326 - 5327
• Main Authors: Ashokkumar, Muthupandian, Grieser, Franz
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 20.04.2005
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other luminescence and radiative recombination; Physics; Sonoluminescence, triboluminescence; Temperature dependence; Aqueous solutions; Luminescence quenching; Cavitation bubble; Sonoluminescence; Acoustic cavitation; Experimental study
• ISSN: 0002-7863; 1520-5126
• DOI: 10.1021/ja050804k

Cavitation bubble temperatures have been measured using a methyl radical recombination method and compared with the changes in the sonoluminescence intensity in aqueous ethanol solutions over a range of concentrations. Whereas the sonoluminescence intensity was decreased by more than 90% at low ethanol concentrations (<0.1 M), the measured bubble temperatures seem to be unaffected at this level of additive. The cavitation bubble temperatures were noticeably decreased at substantially higher ethanol concentrations (0.5 M). It has been concluded that the methyl radical recombination method does not report on the true sonoluminescence temperatures. However, it does report on the average bubble temperatures at which sonochemical reactions occur.