Experimental detection of liquid-phase OH radical decay originating from atmospheric-pressure plasma exposure

Breaking-through methods for experimental observation on short-lived reactive species in the liquid phase, generated at the interface of atmospheric-pressure plasmas (APPs), can contribute greatly to an understanding of the reaction processes. A newly developed high-speed liquid flow interface in helium plasma transports APP-generated liquid-phase OH radical (center dot OH) by advection, enabling observation of rapid APP-generated center dot OH decay within approximately 0.5 ms for the first time, to our best knowledge. This experimental detection and the deduced quantification of the rapid center dot OH decay suggests a surface localization of center dot OH, and thus can be an important finding to characterize the inhomogeneous center dot OH distribution.

Automated summary

The development of a high-speed liquid flow interface in helium plasma has enabled the observation of rapid decay of OH radicals generated by atmospheric-pressure plasmas, providing insights into their surface localization and inhomogeneous distribution. This experimental breakthrough offers a better understanding of reaction processes involving short-lived reactive species in the liquid phase.