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学者姓名：刘定新
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Abstract ：
Air discharge plasma is a potential method for the removal of the toxic rocket propellant unsymmetrical dimethylhydrazine ((CH3)(2)NNH2, UDMH for abbreviation). Combining density functional theory calculation and transition state theory, this paper presents theoretical investigation of the degradation pathways of UDMH under the influence of O-3 in aqueous environment, which is the main reactive species generated by air plasma. The neutral, protonated and deprotonated forms of UDMH are included in our study considering the effect of pH. The results show that the UDMH degradation by O-3 usually initials with the oxygen addition to the N atom, and the reaction positions would change with the pH variation. The main reaction position of neutral and protonated forms of UDMH are the N atom of primary ammonia of UDMH, where UDMH will be converted into N-nitrosodimethylamine and NH2OH through multi-step reactions. For deprotonated UDMH, its main reaction position changes to the N atom of secondary ammonia of UDMH, and it finally decomposes to (CH3)(2)NN and OH with the rate constant of 8.26 x 10(3) M-1 s(-1). The pH value also largely influences the degradation processes, where the rate constants of corresponding reactions would vary by up to 12 orders of magnitude for different forms of UDMH. Based on our calculation, the main byproducts of UDMH degradation and their subsequent degradation pathways are summarized. This work is helpful to lay the theoretical basis of UDMH degradation by plasma ozonation.
Keyword ：
Air plasma Chemical kinetics DFT calculation O-3 UDMH
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| GB/T 7714 | Luo, Santu , Fu, Yuwei , Zhang, Mingyan et al. Theoretical Study on the Degradation Pathways of Unsymmetrical Dimethylhydrazine by Aqueous O-3 [J]. | PLASMA CHEMISTRY AND PLASMA PROCESSING , 2023 , 43 (1) : 81-97 . |
| MLA | Luo, Santu et al. "Theoretical Study on the Degradation Pathways of Unsymmetrical Dimethylhydrazine by Aqueous O-3" . | PLASMA CHEMISTRY AND PLASMA PROCESSING 43 . 1 (2023) : 81-97 . |
| APA | Luo, Santu , Fu, Yuwei , Zhang, Mingyan , Liu, Yifan , Wang, Diankai , Zhang, Jiawei et al. Theoretical Study on the Degradation Pathways of Unsymmetrical Dimethylhydrazine by Aqueous O-3 . | PLASMA CHEMISTRY AND PLASMA PROCESSING , 2023 , 43 (1) , 81-97 . |
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Abstract ：
The global pandemic caused by SARS-CoV-2 has lasted two and a half years and the infections caused by the viral contamination are still occurring. Developing efficient disinfection technology is crucial for the current epidemic or infectious diseases caused by other pathogenic microorganisms. Gas plasma can efficiently inactivate different microorganisms, therefore, in this study, a combination of water spray and plasma-activated air was established for the disinfection of pathogenic microorganisms. The combined treatment efficiently inactivated the Omicron-pseudovirus through caused the nitration modification of the spike proteins and also the pathogenic bacteria. The combined treatment was improved with a funnel-shaped nozzle to form a temporary relatively sealed environ-ment for the treatment of the contaminated area. The improved device could efficiently inactivate the Omicron-pseudovirus and bacteria on the surface of different materials including quartz, metal, leather, plastic, and cardboard and the particle size of the water spray did not affect the inactivation effects. This study supplied a disinfection strategy based on plasma-activated air for the inactivation of contaminated pathogenic microorganisms.
Keyword ：
Bactericidal effects Nitration modification Plasma-activated air (PAA) Reactive species SARS-CoV-2 Omicron variant
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| GB/T 7714 | Guo, Li , Zhao, Pengyu , Jia, Yikang et al. Efficient inactivation of the contamination with pathogenic microorganisms by a combination of water spray and plasma-activated air [J]. | JOURNAL OF HAZARDOUS MATERIALS , 2023 , 446 . |
| MLA | Guo, Li et al. "Efficient inactivation of the contamination with pathogenic microorganisms by a combination of water spray and plasma-activated air" . | JOURNAL OF HAZARDOUS MATERIALS 446 (2023) . |
| APA | Guo, Li , Zhao, Pengyu , Jia, Yikang , Li, Tianhui , Huang, Lingling , Wang, Zifeng et al. Efficient inactivation of the contamination with pathogenic microorganisms by a combination of water spray and plasma-activated air . | JOURNAL OF HAZARDOUS MATERIALS , 2023 , 446 . |
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Abstract ：
Plasma-based technology has been widely applied in the biomedicine, agriculture, and environmental fields. In this study, a new application mode, namely plasma-activated nebulized mist (PANM) was proposed. The saline was nebulized by the plasma-activated air to form a mist, and the inactivation effects on Pseudomonas aeruginosa were analyzed based on the simulated respiratory tract. The PANM through the simulated trachea with different lengths or diameters, and the branched once or twice simulated respiratory tract exhibited effective inactivation effects. The PANM through the combined simulated trachea and pig trachea could also inactivate the bacteria on the inner wall of the pig trachea. This study supplied a potent alternative to antibiotics for the treatment of respiratory tract infections.
Keyword ：
arc discharge inactivation plasma-activated nebulized mist (PANM) reactive species
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| GB/T 7714 | Guo, Li , Niyazi, Gulimire , Huang, Lingling et al. Inactivation effects of the mist nebulized with plasma-activated air on Pseudomonas aeruginosa through the simulated respiratory tract [J]. | PLASMA PROCESSES AND POLYMERS , 2023 . |
| MLA | Guo, Li et al. "Inactivation effects of the mist nebulized with plasma-activated air on Pseudomonas aeruginosa through the simulated respiratory tract" . | PLASMA PROCESSES AND POLYMERS (2023) . |
| APA | Guo, Li , Niyazi, Gulimire , Huang, Lingling , Zhao, Pengyu , Wang, Zifeng , Lin, Jiao et al. Inactivation effects of the mist nebulized with plasma-activated air on Pseudomonas aeruginosa through the simulated respiratory tract . | PLASMA PROCESSES AND POLYMERS , 2023 . |
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Abstract ：
Gliding arc is a promising plasma technology for water activation due to its high energy efficiency for producing reactive nitrogen species (RNS), which is believed as the key agent for the sustained bactericidal effect of plasma-activated water (PAW). Nitric oxide (NO) is the major product of gliding arc and also widely exists in PAW, but the production mechanism of aqueous NO and its role in sterilization have been little investigated before. In this paper, NO-rich plasma effluent gas is produced by gliding arc discharge and introduced into water to produce PAW. The concentrations of gaseous and aqueous reactive species are detected, which decrease with the increasing air flowrate of the gliding arc. To clarify the contribution of plasma-induced RNS on water activation, the NO + air mixed gas is used to simulate the plasma effluent gas, and the results show that the two gases have similar gaseous composition and aqueous NO yield. Compared with the NO + Ar mixed gas with the same NO proportion, the NO + air mixed gas produces much more aqueous NO, implying that the presence of O-2 significantly enhances the production of aqueous NO. The sterilization experiments demonstrate the key role of aqueous NO in sterilization, but an acidic environment is necessary for aqueous NO to achieve a potent bactericidal effect.
Keyword ：
gliding arc discharge nitric oxide plasma-activated water reactive species sterilization
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| GB/T 7714 | Zhu, Mengying , Wang, Zifeng , Chen, Jinkun et al. Gliding arc discharge used for water activation: the production mechanism of aqueous NO and its role in sterilization [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2023 , 56 (3) . |
| MLA | Zhu, Mengying et al. "Gliding arc discharge used for water activation: the production mechanism of aqueous NO and its role in sterilization" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 56 . 3 (2023) . |
| APA | Zhu, Mengying , Wang, Zifeng , Chen, Jinkun , Liu, Linbo , Xi, Wang , Zhang, Fugao et al. Gliding arc discharge used for water activation: the production mechanism of aqueous NO and its role in sterilization . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2023 , 56 (3) . |
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Abstract ：
N2O5, a reactive species produced by air discharge plasma, has recently attracted much attention. Due to its high reactivity and solubility, N2O5 is a key molecule in nitrogen fixation processes and exhibits promising prospects in plasma biomedicine. However, thus far, it is not well known how to produce N2O5 efficiently and then maintain its concentration under the action of fast removal reactions. In view of this, N2O5 production by dielectric barrier discharge (DBD) alone and by the combination of DBD and gliding arc discharge is compared in this paper. It is found that the combination method can yield over three times the concentration of N2O5 compared to the single DBD method with the optimum discharge power. Moreover, the concentration of N2O5 in the effluent gas can be maintained once O-3 also exists because O-3 can continually produce N2O5 to compensate for its reduction. Finally, the sterilization effects of both the plasma effluent gas and plasma-activated water have trends similar to the trend of the gaseous N2O5 concentration, implying that N2O5 plays an important role in sterilization. This paper enhances the understanding of N2O5 chemistry in air discharge plasma and provides an effective way to produce and maintain N2O5 for subsequent applications.
Keyword ：
energy efficiency N2O5 plasma-activated water plasma effluent gas sterilization effect
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| GB/T 7714 | Wang, Zifeng , Zhu, Mengying , Liu, Dingxin et al. N2O5 in air discharge plasma: energy-efficient production, maintenance factors and sterilization effects [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2023 , 56 (7) . |
| MLA | Wang, Zifeng et al. "N2O5 in air discharge plasma: energy-efficient production, maintenance factors and sterilization effects" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 56 . 7 (2023) . |
| APA | Wang, Zifeng , Zhu, Mengying , Liu, Dingxin , Liu, Linbo , Wang, Xiangyu , Chen, Jinkun et al. N2O5 in air discharge plasma: energy-efficient production, maintenance factors and sterilization effects . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2023 , 56 (7) . |
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Abstract ：
As a means of applying cold atmospheric plasma (CAP), plasma-activated solutions have received extensive attention for their excellent anticancer effects. However, previous studies have focused mainly on the local injection of plasma-activated solutions for cancer treatment while ignoring the anticancer effects of intraluminal plasma-activated solution perfusion. In this paper, the anticancer effects of flowing plasma-activated saline (PAS) on human bladder cancer cell lines (J82) were studied in vitro in a microfluidic system. It is noteworthy that flowing PAS can kill cancer cells more efficiently than PAS immersion. Further experimental results show that the anticancer effects of PAS on J82 cells in the microcavity are affected by plasma irradiation time, perfusion time and liquid flow rate. Our research suggests that PAS perfusion therapy can become a controllable alternative therapy pathway in the future clinical treatment of intracavitary tumors.
Keyword ：
Cold atmospheric plasma Microfluidic system Perfusion therapy Plasma-activated saline Reactive oxygen species
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| GB/T 7714 | Zhang, Jishen , Xu, Shengduo , Jing, Xixi et al. Study on the Anticancer Effects of Plasma-Activated Saline Perfusion Based on a Microfluidic System [J]. | PLASMA CHEMISTRY AND PLASMA PROCESSING , 2022 , 43 (1) : 99-110 . |
| MLA | Zhang, Jishen et al. "Study on the Anticancer Effects of Plasma-Activated Saline Perfusion Based on a Microfluidic System" . | PLASMA CHEMISTRY AND PLASMA PROCESSING 43 . 1 (2022) : 99-110 . |
| APA | Zhang, Jishen , Xu, Shengduo , Jing, Xixi , Liu, Dingxin , Zhang, Hao , Wang, Zifeng et al. Study on the Anticancer Effects of Plasma-Activated Saline Perfusion Based on a Microfluidic System . | PLASMA CHEMISTRY AND PLASMA PROCESSING , 2022 , 43 (1) , 99-110 . |
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Abstract ：
Atmospheric pressure plasma jets (APPJs) are widely used for the treatment of water-containing substances such as human tissue, leading to a necessity of understanding the interaction between APPJs and water solutions for the development of plasma biomedicine. The reported two- or three-dimensional fluid models are shown to be an effective method for this study. However, owing to the complex chemistry in APPJ-water interaction, little of them could provide a quantitative estimation of reactive species, which are difficult to be measured but of much interest in the applications. In this paper, a one-dimensional fluid model is developed to simulate the interaction between a helium APPJ and deionized water, which incorporates a relatively comprehensive chemistry both in gas and liquid phases but with a moderate computational load. The composition and distribution of reactive species are quantified during a plasma treatment time of 6 min, which is typical in practice. By considering the sidewise loss inside the quartz tube, the air mixing outside the quartz tube, the conductivity of deionized water, and the chlorine evolution reaction, the simulation results agree well with the experiments. It is found that the plasma could be divided into three regions with much different physicochemical properties, mainly due to the sidewise loss, the air mixing and the water evaporation. In plasma-activated water, H2O2aq and HNO2aq/NO2aq (-) are the dominant reactive species, and OHaq is the key intermediate species for the transformation among other reactive species. Finally, the chemical pathways for the production of aqueous reactive species are elucidated.
Keyword ：
APPJ fluid model plasma-liquid interaction reactive species
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| GB/T 7714 | Liu, Yifan , Liu, Dingxin , Luo, Santu et al. 1D fluid model of the interaction between helium APPJ and deionized water [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2022 , 55 (25) . |
| MLA | Liu, Yifan et al. "1D fluid model of the interaction between helium APPJ and deionized water" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 55 . 25 (2022) . |
| APA | Liu, Yifan , Liu, Dingxin , Luo, Santu , Sun, Bowen , Zhang, Mingyan , Yang, Aijun et al. 1D fluid model of the interaction between helium APPJ and deionized water . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2022 , 55 (25) . |
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Abstract ：
In plasma cancer therapy, atmospheric pressure plasma jets have attracted increasing attention in recent years. In this study, from the point of view of economic costs and portability, we have employed atmospheric air as the working gas in order to investigate the effects of the rate of flow, applied voltage, frequency, and pulse width on the characteristics of discharge. The concentrations of reactive oxygen and nitrogen species (RONS) in a plasma-activated medium (PAM) were characterized in order to explore their chemical activity. In addition, the inactivating effect of tumor cells induced by an air plasma jet was investigated and the corresponding inactivation mechanism is also discussed. The results showed that the discharge intensity was positively correlated with frequency and voltage, and negatively correlated with pulse width. Regarding the gas flow rate, when the air flow rate was 1 standard liter per minute (SLM), the discharge intensity was strongest according to the length of the plume. By summarizing the discharge characteristics and emission spectra under different experimental parameters, the stable treatment conditions producing rich active substances were as follows: a frequency of 6 kHz, a voltage of 14 kV, a gas flow rate of 1 SLM, and a pulse width of 1 mu s. Furthermore, under these stabilized conditions, the air plasma jet produced rich aqueous RONS in a PAM effectively, which killed cells in significant numbers and reduced the cell survival rate. Therefore, this study demonstrates the potential application of an atmospheric PAM for the treatment of tumor cells and promotes a deeper understanding of plasma liquid chemistry.
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| GB/T 7714 | Peng, Sansan , Qi, Miao , Zhang, Huaiyan et al. Discharge characteristics of a microsecond pulse power supply driven air plasma jet and its anticancer cell effect [J]. | PHYSICS OF PLASMAS , 2022 , 29 (1) . |
| MLA | Peng, Sansan et al. "Discharge characteristics of a microsecond pulse power supply driven air plasma jet and its anticancer cell effect" . | PHYSICS OF PLASMAS 29 . 1 (2022) . |
| APA | Peng, Sansan , Qi, Miao , Zhang, Huaiyan , Zhang, Jin , Liu, Rong , Pang, Bolun et al. Discharge characteristics of a microsecond pulse power supply driven air plasma jet and its anticancer cell effect . | PHYSICS OF PLASMAS , 2022 , 29 (1) . |
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Abstract ：
C5F10O-insulated environmental-friendly power equipment has great potential to be used in the near future to reduce greenhouse effect. During maintenance, C5F10O should be supplemented or replaced, and the released gas is promisingly to be removed by advanced oxidation processes, but chemical kinetics of C5F10O with the most reactive and dominant species center dot OH radical in air plasma is still not clear. Therefore, this paper studied the degradation pathways and rate constants of C5F10O + center dot OH in both gaseous and aqueous phases with M06-2X/6-31G* method and transition state theory. A continuum solvation model was also employed to study the influence of solvent on chemical kinetics of C5F10O + center dot OH. The results show that most reactions (except for R7 and R8) in both phases have a similar transition state vibration mode leading to same products but rate constants are different. The rate constants of reactions R5 and S5 are highest in corresponding states, respectively, playing a dominant role in the degradation of C5F10O + center dot OH, but the rate constant of reaction S5 is much lower indicating that AOP treatment for C5F10O in gas phase is more effective. This work lays a theoretical basis for plasma modeling and experimental investigation for C5F10O degradation by advanced oxidation process.
Keyword ：
6-31G* C5F10O Chemical kinetics Degradation pathways M06-2X
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| GB/T 7714 | Fu, Yuwei , Luo, Santu , Li, Xingdi et al. Chemical Kinetics of C5F10O with Reactive center dot OH Radical Induced in AOP in Gaseous and Aqueous Phases [J]. | PLASMA CHEMISTRY AND PLASMA PROCESSING , 2022 , 42 (6) : 1265-1278 . |
| MLA | Fu, Yuwei et al. "Chemical Kinetics of C5F10O with Reactive center dot OH Radical Induced in AOP in Gaseous and Aqueous Phases" . | PLASMA CHEMISTRY AND PLASMA PROCESSING 42 . 6 (2022) : 1265-1278 . |
| APA | Fu, Yuwei , Luo, Santu , Li, Xingdi , Chen, Chi , Wang, Chuang , Zhang, Zaiqin et al. Chemical Kinetics of C5F10O with Reactive center dot OH Radical Induced in AOP in Gaseous and Aqueous Phases . | PLASMA CHEMISTRY AND PLASMA PROCESSING , 2022 , 42 (6) , 1265-1278 . |
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Abstract ：
Plasma-activated water (PAW) regarded as a green alternative is of great interest in biomedicine due to the presence of a rich diversity of aqueous reactive oxygen and nitrogen species (RONS). Optimizing the reactor parameter is an important approach to regulate RONS in PAW to obtain better biological effects. This work mainly focuses on the number of micro holes of the plasma device to realize underwater bubble discharge. By comparing single-hole and multi-hole plasma under the same pulse voltage, the multi-hole plasma would produce a better discharge characteristic, and the prepared PAW presents superior physicochemical properties to realize high level RONS production by means of microbubbles to increase the contact area with water molecules. Furthermore, the A549 lung carcinoma cells are used to verify the inactivation effect induced by PAW treated by underwater single-hole and multi-hole bubble plasma, respectively, and the results show that the multi-hole plasma would induce cell apoptosis reaching up to 57.4%, while only 31.2% apoptosis efficiency for single-hole plasma. This mainly contributes to the high concentration of key species (NO2 (-), H2O2, ONOO-/O-2 (-), and center dot OH) produced by multi-hole plasma. This study is helpful to insight into the influence of underwater bubble on chemistry activity of PAW, and promoting the wide applications in biomedical field.
Keyword ：
anticancer effects plasma-activated water (PAW) plasma device reactive oxygen and nitrogen species (RONS)
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| GB/T 7714 | Liu, Zhijie , Gao, Yuting , Pang, Bolun et al. Comparison of the physicochemical properties and inactivation against tumor cells of PAW induced by underwater single-hole and multi-hole bubble plasma [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2022 , 55 (29) . |
| MLA | Liu, Zhijie et al. "Comparison of the physicochemical properties and inactivation against tumor cells of PAW induced by underwater single-hole and multi-hole bubble plasma" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 55 . 29 (2022) . |
| APA | Liu, Zhijie , Gao, Yuting , Pang, Bolun , Wang, Sitao , Tantai, Xiamin , Zhang, Feng et al. Comparison of the physicochemical properties and inactivation against tumor cells of PAW induced by underwater single-hole and multi-hole bubble plasma . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2022 , 55 (29) . |
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