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DOE OSTI · 1924576

Non‐OH‐driven liquid‐phase chemistry in water microdroplets

Nayak, Gaurav·Wang, Jianan·Li, Rui·Aranzales, Diana·Thagard, Selma Mededovic·Bruggeman, Peter J.
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Abstract

Abstract Water microdroplets containing organic and fluorinated compounds, such as formate, perfluorooctanoic acid (PFOA) and triflic acid, were exposed to a radiofrequency glow discharge plasma with a droplet residence time on the order of milliseconds. Triflic acid remained unaffected by any plasma condition while >75% decomposition of formate and PFOA could be achieved. In situ hydroxyl (OH)‐laser‐induced fluorescence measurements near the droplets confirmed that the conversion was independent of the OH flux to the droplet. A series of control experiments suggest that the contribution of vacuum UV photons in such decomposition of aqueous compounds can be significant for He and He + 17% Ar plasmas and can also explain unexpected decomposition trends as a function of droplet residence time in the plasma.

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70 PLASMA PHYSICS AND FUSION TECHNOLOGYPhysicsPolymer Sciencedropletphotolysisplasma-liquid interactionplasma‐induced liquid‐phase chemistryradicalssolvated electron

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Nayak, Gaurav, Wang, Jianan, Li, Rui, Aranzales, Diana, Thagard, Selma Mededovic, Bruggeman, Peter J.. 2023-02-13. Non‐OH‐driven liquid‐phase chemistry in water microdroplets. https://doi.org/10.1002/ppap.202200222

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