The interaction of low-temperature plasmas with liquid water is a fundamental problem in many applications, from plasma medicine to chemical processing, and more generally where the generation of reactive oxygen and nitrogen species and/or of solvated electrons is of utmost importance. However, characterization of the plasma-liquid interface presents several challenges, both experimentally and computationally, due to the multiscale and multiphysics nature of the problem. In this seminar we provide an overview of recent modeling developments on plasma-liquid interfaces, presenting the new software package Zapdos-CRANE, based on the MOOSE finite-element framework. We provide a brief overview of the software, showing few case studies of interest. The model was used to study a humid argon DC plasma over a water surface, operated in both cathodic and anodic modes. In this system, one of the reactions of interest is the formation and dissolution of hydroxide (OH) radicals, which subsequently produce hydrogen peroxide. The model allows the investigation of the main plasma-chemistry reaction mechanisms for peroxide production with the plasma. The analysis reveals that hydrogen peroxide is increased during anodic plasma treatment due to elevated water vapor dissociation reactions near the interface. Finally, the role of solvated electrons generated during cathodic plasma operations is discussed, showing how they directly degrade hydrogen peroxide in the aqueous phase, inhibiting its accumulation.

Co-sponsored by: MIPSE and SEM NPSS

Speaker(s): Prof. Davide Curreli,

Bldg: 1311 EECS, 1301 Beal Ave, Ann Arbor, Michigan, United States, 48109, Virtual: https://events.vtools.ieee.org/m/286443