Production of O Radicals from Cavitation Bubbles Under Ultrasound

Overview

Journal Molecules

Publisher MDPI

Specialty Biology

Date 2022 Jul 28

PMID 35897962

Authors

Kyuichi Yasui

Affiliations

Soon will be listed here.

Abstract

In the present review, the production of O radicals (oxygen atoms) in acoustic cavitation is focused. According to numerical simulations of chemical reactions inside a bubble using an ODE model which has been validated through studies of single-bubble sonochemistry, not only OH radicals but also appreciable amounts of O radicals are generated inside a heated bubble at the violent collapse by thermal dissociation of water vapor and oxygen molecules. The main oxidant created inside an air bubble is O radicals when the bubble temperature is above about 6500 K for a gaseous bubble. However, the concentration and lifetime of O radicals in the liquid water around the cavitation bubbles are unknown at present. Whether O radicals play some role in sonochemical reactions in the liquid phase, which are usually thought to be dominated by OH radicals and HO, should be studied in the future.

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