Plasma-droplet interaction study to assess transport limitations and the role of ^?OH, O^?,H^?,O₂(a ¹?_g),O₃, He(2³ S) and Ar(1s ₅) in formate decomposition

Abstract Plasmas interacting with liquid microdroplets are gaining momentum due to their ability significantly enhance the reactivity transfer from gas phase plasma liquid. This is, for example, critically important efficiently decomposing organic pollutants in water. In this contribution, role of ? OH as well non- OH-driven chemistry initiated by activation small water a controlled environment diffuse RF glow discharge He different admixtures (Ar, O 2 and humidified He) at atmospheric pressure is quantified. The effect short-lived radicals such H atoms, singlet delta oxygen (O ( 1 ? g )), 3 metastable atoms Ar, besides radicals, on decomposition formate dissolved droplets was analyzed using detailed diagnostics, droplet characterization ex situ chemical analysis treated droplets. increased increasing residence time plasma, ?70% occurring within ?15 ms treatment time. oxidation shown be limited flux lower concentrations significant enhancement lowest concentration, attributed e ? /ion-induced reactions. However, diffusion higher gaseous concentrations. He/O similar, although an order magnitude radical density than corresponding He/H plasma. Using one-dimensional reaction–diffusion model, we showed that ) did not play , possibly generated vapor containing droplet-plasma boundary layer.