Generation of microwave-excited atmospheric-pressure line plasma and its application

Kuwahata, Hiroshi; Miyata, Hiroshi; Isomura, Masao; Shindo, Haruo

doi:10.7567/jjap.56.126201

Cited by 3 publications

(1 citation statement)

References 42 publications

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“…OH, in particular, has extremely high oxidizing power and is widely used for the treatment of solid surfaces and air purification. OH is generated from vacuum UV (VUV) light, 1) plasma systems, [2][3][4][5][6][7][8] and photocatalysts. [9][10][11][12] Therefore, a method of monitoring OH has been desired in order to control the amount of OH generated from such processes.…”

Section: Introductionmentioning

confidence: 99%

Development of n-alkylammonium terephthalate immobilized sheet for facile measurement of spatial distribution of gaseous OH radical (OH)

Hosokawa,

Tohnai

2023

Jpn. J. Appl. Phys.

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n-Alkylammonium terephthalate immobilized sheets enable the facile measurement of gaseous OH radical (OH). In this study, we have clarified the preparation conditions of the sheets to further improve the detection performance of OH. The fluorescence response to OH tended to increase with shorter alkyl chain lengths of the n-alkylamines, with bis(n-octylammonium) terephthalate (nOA-TA), an organic salt with an alkyl chain length of 8, exhibiting the best response performance. Furthermore, the smaller the pore size of the membrane filter immobilizing nOA-TA, the better the fluorescence response performance to OH. Finally, we developed a procedure for converting the fluorescence image of the nOA-TA immobilized sheet exposed to gaseous OH into an HTA/TA ratio map. This makes it possible to quantitatively visualize the spatial distribution of gaseous OH two-dimensionally.

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Section: Introductionmentioning

confidence: 99%

Development of n-alkylammonium terephthalate immobilized sheet for facile measurement of spatial distribution of gaseous OH radical (OH)

Hosokawa,

Tohnai

2023

Jpn. J. Appl. Phys.

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Primary Ammonium Terephthalate Salts with High Moisture Resistance and Their Use in the Detection of OH Radicals

2020

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A novel and practical method is proposed for the detection of gaseous OH radicals using a moisture‐resistant organic salt composed of terephthalic acid (TPA) and n‐alkylamine. When the alkyl chain length was greater than 8, the organic salt had a crystal structure in which the alkyl chains were arranged parallel to each other and zero‐dimensional voids were adjacent to terephthalate (TA). Since the parallelly arranged alkyl chains acted as a hydrophobic block, the organic salts had excellent humidity durability. The highly hydrophobic bis(n‐octylammonium) terephthalate (nOA‐TA) powder was exposed to gaseous OH radicals generated by a low‐pressure mercury lamp and a fluorescence response suggesting the formation of bis(n‐octylammonium) hydroxyterephthalate (nOA‐HTA) was observed. The presence of the zero‐dimensional voids in the nOA‐TA crystal caused the formation of nOA‐HTA. In addition, a sheet was prepared in which nOA‐TA crystals were uniformly immobilized in the pores of a membrane filter, and the spatial distribution of OH radicals was evaluated.

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Frequency dependence of the capacitive excitation of plasma: An experimental proof

Porteanu

Wolf

Heinrich

2020

Journal of Applied Physics

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Today, most of the microwave plasma sources are driven at 2.45 GHz. Meanwhile, GaN technology offers high-power components working efficiently at higher frequencies. Therefore, the perspective of plasma excitation at increased frequencies has to be investigated. The present work compares two plasma sources fabricated in the same way, having the same size discharge zone, however, different lengths in order to resonate at 2.45 GHz and 5.8 GHz, respectively. We conclude that, at the higher frequency, for the same absorbed microwave power, the electron density is almost two times higher. This evidence comes from microwave impedance analysis, optical emission intensities, and current voltage measurement on the effluent plasma jet.

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Generation of microwave-excited atmospheric-pressure line plasma and its application

Cited by 3 publications

References 42 publications

Development of n-alkylammonium terephthalate immobilized sheet for facile measurement of spatial distribution of gaseous OH radical (OH)

Development of n-alkylammonium terephthalate immobilized sheet for facile measurement of spatial distribution of gaseous OH radical (OH)

Primary Ammonium Terephthalate Salts with High Moisture Resistance and Their Use in the Detection of OH Radicals

Frequency dependence of the capacitive excitation of plasma: An experimental proof

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