Reactivity of solvated electrons in ionic liquid interacting with low-pressure plasmas

Inagaki, Yuichi; Sasaki, Koichi

doi:10.35848/1347-4065/ab8d4e

Cited by 3 publications

(3 citation statements)

References 36 publications

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“…More recently, Sakakibara and coworkers detected hydrated electrons produced by laser-induced plasma in water [20], but it was not an experiment at the plasma-water interface. In previous works [21,22], we investigated the reactivity of solvated electrons in liquids interacting with plasmas by measuring the lifetime of solvated electrons produced by the charge transfer to solvent (CTTS) transition of iodide negative ions (I − ) [23]. However, these experiments were carried out in bulk liquids, and solvated electrons we observed were not generated by the plasma-liquid interaction.…”

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confidence: 96%

Detection of solvated electrons below the interface between atmospheric-pressure plasma and water by laser-induced desolvation

Inagaki¹,

Sasaki²

2022

Plasma Sources Sci. Technol.

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We have developed a new method to detect solvated (hydrated) electrons at the plasma-water interface. The method is based on the laser-induced desolvation followed by the release of free electrons into the plasma. We employed an atmospheric-pressure dc glow discharge, in which the water surface worked as the cathode, in the experiment. When the region just below the water cathode was irradiated with a pulsed laser beam, we observed the pulsed increase in the discharge current. The increase in the discharge current was caused by the release of free electrons which were produced from hydrated electrons by the laser-induced desolvation. The pulsed increase in the discharge current was sensitive to the laser wavelength. We compared the relationship between the pulsed increase and the laser wavelength with the distribution of the solvation energy of hydrated electrons with the help of a Monte Carlo simulation on the transport of free electrons in water. As a result, it was concluded that hydrated electrons produced at the experimental condition were located at a distance of 7-15 nm from the plasma-water interface.

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confidence: 96%

Detection of solvated electrons below the interface between atmospheric-pressure plasma and water by laser-induced desolvation

Inagaki¹,

Sasaki²

2022

Plasma Sources Sci. Technol.

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“…Recently, the in situ measurement of solvated electrons has attracted much attention, and techniques such as total internal reflection absorption (Rumbach et al 2015b, Rumbach et al 2015a) and charge transfer to the solvent (Inagaki and Sasaki 2020) have been developed for this purpose. In particular, the former is capable of detecting a surface layer several nanometers thick and is currently one of the only techniques for the spatially resolved characterization of the interface.…”

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confidence: 99%

Plasma-liquid interfacial layer detected by in situ Raman light sheet microspectroscopy

Pai¹

2021

J. Phys. D: Appl. Phys.

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In situ Raman microscopy has been adapted to study the plasma-water interface by applying a light sheet technique. The Raman modes of the -OO stretch of H2O2, symmetric stretch (v1) of NO3 -, and -OH bend of water were measured simultaneously. By modulating the volume of water under detection, both the bulk liquid and interface regions have been probed with micrometer depth resolution. The plasma was a DC glow discharge generated in atmospheric-pressure air with a water cathode. In the bulk liquid, the molar concentration of aqueous NO3increased at a linear rate of 48 µM/minute, whereas aqueous H2O2 growth stopped at about 5 mM. The concentrations of H2O2 and NO3both increased when measuring at depths less than about 20 µm from the interface. The depth profile of NO3concentration was reconstructed, showing that the interfacial layer of NO3has a depth of 28 µm. The shape of the meniscus may influence the interpretation of this depth. Previous models of plasma-water interfaces have predicted interfacial layers of similar depth for short-lived aqueous species such as OH but not for long-lived species such as NO3 -.

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“…In a previous work, 22) we adopted the CTTS transition of iodine negative ions (I − ) to examine the reaction frequency of solvated electrons in an ionic liquid (N,N,N-trimethyl-Npropylammonium bis (trifluoromethylsulfonyl) imide) interacting with a low-pressure argon, oxygen, and nitrogen plasmas. In this work, we carried out a similar experiment in water interacting with an atmospheric-pressure helium plasma jet.…”

Section: Introductionmentioning

confidence: 99%

Reaction frequency of solvated electrons in water interacting with atmospheric-pressure helium plasma jet

Inagaki¹,

Sasaki²

2021

Jpn. J. Appl. Phys.

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We employed the charge transfer to solvent (CTTS) transition of iodine negative ions to investigate the reactivity of solvated electrons in water interacting with an atmospheric-pressure helium plasma jet. A dye laser pulse at 225 nm was injected into the solution of potassium iodide, which was irradiated with an atmospheric-pressure helium plasma jet, and the reaction frequency of solvated electrons produced by the CTTS transition was measured by optical absorption spectroscopy. We observed the temporal and spatial variations of the reaction frequency of solvated electrons. We found that the reaction frequency of solvated electrons was determined by the concentrations of dissolved oxygen and hydrogen peroxide. We detected a high reaction frequency of solvated electrons in the limited depth region from the solution surface, indicating that hydrogen peroxide is localized near the plasma-liquid interface.

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Reactivity of solvated electrons in ionic liquid interacting with low-pressure plasmas

Cited by 3 publications

References 36 publications

Detection of solvated electrons below the interface between atmospheric-pressure plasma and water by laser-induced desolvation

Detection of solvated electrons below the interface between atmospheric-pressure plasma and water by laser-induced desolvation

Plasma-liquid interfacial layer detected by in situ Raman light sheet microspectroscopy

Reaction frequency of solvated electrons in water interacting with atmospheric-pressure helium plasma jet

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