Development of direct gas injection system for atmospheric-pressure in-solution discharge plasma for plasma degradation and material syntheses

Banno, Motohiro; Kanno, Kenta; Yui, Hiroharu

doi:10.1039/c5ra18836a

Cited by 14 publications

(10 citation statements)

References 35 publications

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“…In general, the electron temperature is higher than the ion temperature in the case of non-equilibrium plasma25. However, the temperature at the center of the plasma is still high, i.e., approximately 4000 K2627, even though the solution temperature is maintained at approximately room temperature. Thus, a temperature gradient exists between the center of the plasma and the plasma–solution interface.…”

mentioning

confidence: 97%

Fastest Formation Routes of Nanocarbons in Solution Plasma Processes

Morishita

Ueno

Panomsuwan

et al. 2016

Sci Rep

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Although solution-plasma processing enables room-temperature synthesis of nanocarbons, the underlying mechanisms are not well understood. We investigated the routes of solution-plasma-induced nanocarbon formation from hexane, hexadecane, cyclohexane, and benzene. The synthesis rate from benzene was the highest. However, the nanocarbons from linear molecules were more crystalline than those from ring molecules. Linear molecules decomposed into shorter olefins, whereas ring molecules were reconstructed in the plasma. In the saturated ring molecules, C–H dissociation proceeded, followed by conversion into unsaturated ring molecules. However, unsaturated ring molecules were directly polymerized through cation radicals, such as benzene radical cation, and were converted into two- and three-ring molecules at the plasma–solution interface. The nanocarbons from linear molecules were synthesized in plasma from small molecules such as C2 under heat; the obtained products were the same as those obtained via pyrolysis synthesis. Conversely, the nanocarbons obtained from ring molecules were directly synthesized through an intermediate, such as benzene radical cation, at the interface between plasma and solution, resulting in the same products as those obtained via polymerization. These two different reaction fields provide a reasonable explanation for the fastest synthesis rate observed in the case of benzene.

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confidence: 97%

Fastest Formation Routes of Nanocarbons in Solution Plasma Processes

Morishita

Ueno

Panomsuwan

et al. 2016

Sci Rep

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“…The result showed that the high concentration of dissolved O 2 insignificantly increases the amount of H 2 O 2 . Moreover, Yui et al developed a direct gas injection system at the tip of the electrode, as shown in Figure 7 b [ 5 , 65 ]. The injecting gases were O 2 , CO 2 , N 2 , and Ar.…”

Section: Solution Plasma Process (Spp): Chemistry and Influencing Parametersmentioning

confidence: 99%

“… Systems with different configurations of adding bubbles, proposed by ( a ) Goto et al [ 51 ] and ( b ) Yui et al [ 65 ]. …”

Section: Figurementioning

confidence: 99%

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Insight on Solution Plasma in Aqueous Solution and Their Application in Modification of Chitin and Chitosan

Chokradjaroen

Niu

Panomsuwan

et al. 2021

IJMS

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Sustainability and environmental concerns have persuaded researchers to explore renewable materials, such as nature-derived polysaccharides, and add value by changing chemical structures with the aim to possess specific properties, like biological properties. Meanwhile, finding methods and strategies that can lower hazardous chemicals, simplify production steps, reduce time consumption, and acquire high-purified products is an important task that requires attention. To break through these issues, electrical discharging in aqueous solutions at atmospheric pressure and room temperature, referred to as the “solution plasma process”, has been introduced as a novel process for modification of nature-derived polysaccharides like chitin and chitosan. This review reveals insight into the electrical discharge in aqueous solutions and scientific progress on their application in a modification of chitin and chitosan, including degradation and deacetylation. The influencing parameters in the plasma process are intensively explained in order to provide a guideline for the modification of not only chitin and chitosan but also other nature-derived polysaccharides, aiming to address economic aspects and environmental concerns.

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“…4 We have also succeeded in arranging the gas composition in the ASG plasma by developing a direct gas introducing system through pipe electrodes. 12 The ASG plasma exhibits another characteristic discharge mode. When the distance between the electrodes is extended to more than several millimeters, the ASG plasma, spatially connecting both edge of the electrodes, is separated into two plasmas, localized at the vicinities of the anodic and cathodic electrodes.…”

Section: Introductionmentioning

confidence: 99%