期刊
ULTRASONICS SONOCHEMISTRY
卷 73, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2021.105493
关键词
Sonochemical activity; Acoustic cavitation; Cavitation-free radical generation; Cavitation bubbles
资金
- University of Melbourne under the Melbourne India Postgraduate Academy (MIPA)
- Innovation in Science in Pursuit of Research (INSPIRE), Department of Science, Government of India
- BRNSBARC, Department of Atomic Energy, Government of India
The study conducted experiments on sonochemical activity using PZT-based ultrasonic units and found that acoustic cavitation plays a dominant role in radical generation, with a strong correlation between sonochemical activity and dissolved gas concentration. Negligible sonochemical activity was observed at near-vacuum conditions.
The generation of cavitation-free radicals through evanescent electric field and bulk-streaming was reported when micro-volumes of a liquid were subjected to 10 MHz surface acoustic waves (SAW) on a piezoelectric substrate [Rezk et al., J. Phys. Chem. Lett. 2020, 11, 4655?4661; Rezk et al., Adv. Sci. 2021, 8, 2001983]. In the current study, we have tested a similar hypothesis with PZT-based ultrasonic units (760 kHz and 2 MHz) with varying dissolved gas concentrations, by sonochemiluminescence measurement and iodide dosimetry, to correlate radical generation with dissolved gas concentrations. The dissolved gas concentration was adjusted by controlling the over-head gas pressure. Our study reveals that there is a strong correlation between sonochemical activity and dissolved gas concentration, with negligible sonochemical activity at near-vacuum conditions. We therefore conclude that radical generation is dominated by acoustic cavitation in conventional PZT-based ultrasonic reactors, regardless of the excitation frequency.
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