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- W3136452664 abstract "Abstract It is demonstrated that Cu ions can be used to control the ageing of plasma-activated liquids through the Fenton-type reaction, which acts as a competitor to the <?CDATA ${mathrm{N}mathrm{O}}_{2}^{-}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> </mml:mrow> </mml:msubsup> </mml:math> + H 2 O 2 + H + → products reaction, and thus moderates the recombination of <?CDATA ${mathrm{N}mathrm{O}}_{2}^{-}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> </mml:mrow> </mml:msubsup> </mml:math> ions. It is shown that the ageing dynamics is influenced by the type of Cu-ions source used, due to the different ion dissolution dynamics. Using CuNP-colloidal and copper acetate salt solutions, respectively, similar ageing dynamics can be achieved: the lifetime of <?CDATA ${mathrm{N}mathrm{O}}_{2}^{-}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> </mml:mrow> </mml:msubsup> </mml:math> can be increased to 10 4 min comparing to 10 2 min obtained in plasma-activated water, while the H 2 O 2 concentration decreases to about half of its initial value. While the treated salt solutions contain the degradation products of the salt compounds, the CuNPs can be filtered out from the plasma-activated colloid (PAC). It is shown that filtration does not influence the concentration of active species, while the ageing of the filtrated PAC depends on the moment of filtration, which determines the concentration of dissolved Cu ions. Using copper foil, the dissolved Cu-ion concentration can be controlled by removing the foil during ageing, and in this way the lifetime of species and the H 2 O 2 concentration can be adjusted. The effect has been validated in the case of two different plasma sources: a surface-wave microwave discharge and a kHz plasma jet, which produce PALs with different <?CDATA $left[{mathrm{N}mathrm{O}}_{2}^{-}right]/left[{mathrm{H}}_{2}{mathrm{O}}_{2}right]$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll> <mml:mrow> <mml:mo stretchy=false>[</mml:mo> <mml:mrow> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> </mml:mrow> </mml:msubsup> </mml:mrow> <mml:mo stretchy=false>]</mml:mo> </mml:mrow> <mml:mo>/</mml:mo> <mml:mrow> <mml:mo stretchy=false>[</mml:mo> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi mathvariant=normal>H</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> <mml:mo stretchy=false>]</mml:mo> </mml:mrow> </mml:math> concentration ratio, which is the main governor of the ageing process." @default.
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- W3136452664 date "2021-04-01" @default.
- W3136452664 modified "2023-10-15" @default.
- W3136452664 title "Controlling: the composition of plasma-activated water by Cu ions" @default.
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