Non-touching plasma–liquid interaction – where is aqueous nitric oxide generated?

Abstract

The ˙NO-adduct concentration is determined for different curtain gases after 30 s plasma treatment as a function of the feed gas admixture. By comparison with Ar + ˙NO-gas treatment, the origin was proven to lie in the liquid and a solvation process could play only a minor role.

On a heavy path – determining cold plasma-derived short-lived species chemistry using isotopic labelling

“…Depending on plasma source, feed gas composition, and distance to the target, ROS/ RNS generation varies. [26][27][28][29][30] A major role of these plasmaderived ROS/RNS is assumed, 31,32 but incongruity regarding the mode of action exists. It was argued that cell membraneassociated proteins pick up and translate the induced signals 33 or that species can cross the cell membrane using specic pore proteins 34 and trigger intracellular responses via cytosolic sensor proteins 35 or the mitochondria.…”

Study of the plasma–liquid interaction for an argon nonthermal microwave plasma jet from the analysis of benzene degradation

“…Moreover, chemistry in the bulk of the liquid (including oxidation of CCA) could also be relevant. [48,53,54] As shown in Figure 8b, an initial growing tendency with the gas flow rate is observed, but relatively high flow rates disfavor CCA oxidation to CCA-7-OH. In the beginning, a higher flow implies both faster evaporation and a greater amount of excited argon species generating…”

“…However, the generation of reactive nitrogen species in plasma jets generally initiates with the formation of • NO from N* reacting with O 2 , and eventually, further reactions with other ROS and RNS result in the generation of N x O y species. [53] The following reactions have been proposed by Jablonowski et al [54] for • NO formation in an argon plasma jet open to the air in References [51,54]:…”

“…A subsequent oxidation of • NO by oxidizing agents such as O 3 or • O leads to • NO 2 formation [51,54] NO+O or O NO + products.…”

“…This fact could be tentatively explained considering that the temperature of the plasma became 100 K smaller and most probably there was a reduction in evaporation. Moreover, under a turbulent flow regime, interactions of the plasma jet with the liquid surface result in a stronger disruption of the surface and ultimately in a gas-liquid turbulent mixing, [1] most probably favoring reactions leading to • OH reduction [48,53,54] where subscript "aq" denotes species in the aqueous medium.…”