Chemical reactivity transfer from gas-phase plasmas to liquid can be significantly enhanced when a plasma interacts with small liquid micro-droplets as opposed to bulk liquid. In this contribution, the role of • OH as well as non- • OH driven chemistry on the degradation of an organic compound (formate) by activation of water micro-droplets by atmospheric pressure diffuse RF glow plasmas in He and different gas admixtures (Ar, H 2 , O 2 , H 2 O) is explored. Using detailed gas-phase plasma diagnostics, droplet characterization and ex situ chemical analysis of the plasma- treated droplets, the effect of short-lived species such as O • , H • and • OH, O 2 ( a ), electrons/ions, and metastable atoms of He and Ar is quantified. With increasing droplet residence time, the formate decomposition increases in electronegative plasmas (He/H 2 O He/Ar/H 2 O, He/O 2 ), with a maximum of ~70% within ~15 ms, while an inverse trend is observed in electropositive plasmas (He, He/H 2 , He/Ar), with >75% degradation within ~5 ms.
|Original language||English (US)|
|Title of host publication||2021 IEEE International Conference on Plasma Science, ICOPS 2021|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|State||Published - Sep 12 2021|
|Event||2021 IEEE International Conference on Plasma Science, ICOPS 2021 - Lake Tahoe, United States|
Duration: Sep 12 2021 → Sep 16 2021
|Name||IEEE International Conference on Plasma Science|
|Conference||2021 IEEE International Conference on Plasma Science, ICOPS 2021|
|Period||9/12/21 → 9/16/21|
Bibliographical noteFunding Information:
________________________________ * This work was supported by the Army Research Office under Grant No. W911NF-20-1-0105 and NSF grant under Award Number PHY 1903151.
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