Generation and delivery of free hydroxyl radicals using a remote plasma

We demonstrate a new gas-based OH generation source using low power RF-driven atmospheric pressure plasma configured to deliver the radical flux into far effluent region, well away from interference other factors such as electric fields, currents, and UV radiation. Using He-H2O gas chemistry isolated laboratory air, generated consists of H2O2 OH, varying with H2O vapour content absorbed density. Peak values were 2.3 nmol s-1 0.23 for respectively at distance 50 mm plasma, 790 ppmv density 1E8 W m-3. The maximum was 4.5 x 1E19 m-2 falling 1.7 110 mm, equivalent rates 74 uM 28 s-1. Despite high recombination exit, escaping is still significant, indicating viable delivery capability downstream targets. Its performance regard compares traditional techniques radiolysis, advanced oxidation processes enhanced Fenton-chemistry approaches where production are sub-uM Delivering precisely quantifiable fluxes provides opportunities scientific studies technological in cell biology, chemistry, protein unfolding systematic dose plasma-based related potential medical treatments.