Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 105, Issue 15, Pages 3796-3802Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp003226x
Keywords
-
Ask authors/readers for more resources
A comprehensive investigation of ultrasonic frequency rind its role in sonochemical activity and sonoluminescence (SL) has been performed. SL spectra and intensity were examined at four frequencies (205, 358, 618, and 1071 kHz) and in the presence of varying argon and oxygen saturation ratios. A series of high-energy reactions induced by the extreme temperatures and pressures obtained within a microbubble during acoustic cavitation contribute to the broad continuum characteristic of SL spectra. Chemical reactivity was also measured at all four frequencies. 1,4-Dioxane decomposition and hydrogen peroxide formation were chosen as representative sonochemical processes. A 358 kHz value was the optimal frequency for maximum SL intensity and chemical reaction rates. The impact of a hydroxyl radical scavenger, bicarbonate ion, on SL intensity and H2O2 formation was also examined. Results from this investigation indicate that nonlinear bubble implosions play a more significant role at lower frequencies whereas higher species flux rates influence chemical reactivity, at higher frequencies.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available