Journal article

Acoustic cavitation at low gas pressures in PZT-based ultrasonic systems.

Joydip Mondal, Wu Li, Amgad R Rezk, Leslie Y Yeo, Rajaram Lakkaraju, Parthasarathi Ghosh, Muthupandian Ashokkumar

Ultrasonics Sonochemistry | Published : 2021

Abstract

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 re..

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