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Contrasting Characteristics of Gas-Liquid Reactive Species Induced by Pulse-Modulated RF and kHz Sinusoidal Plasma Jets SCIE
期刊论文 | 2019 , 47 (2) , 1336-1344 | IEEE TRANSACTIONS ON PLASMA SCIENCE
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Abstract :

The pulse-modulated radio frequency (RF) and kHz sinusoidal voltages are used for the excitation of two plasma jets, for which the reactive species in the plasma plumes and in the treated water are comparatively studied. With the same discharge power, it is found that concentrations of aqueous reactive species generated by the kHz sinusoidal plasma jet are higher than that of the pulse-modulated RF plasma jet, especially for the short-lived species OH. In addition, the comparison between the bacterial inactivation results is in accordance with that for the concentrations of aqueous reactive species for the two types of plasma jets. On the contrary, the emission spectra indicate that the gaseous reactive species such as OH(A) and O(3p5P) have much higher densities for the pulse-modulated RF plasma jet, which should ascribe to its higher electron density and electron temperature. Moreover, the concentrations of the aqueous reactive species and the emission intensities of the gaseous reactive species have similar variation trends for each of the plasma jets, as a function of the discharge power and the gap width. These results imply that the emission intensity could not reflect the relative concentration of an aqueous reactive species between these two plasma jets, but it could be used as an indicator of the concentration variation of an aqueous reactive species for each of the plasma jets. In addition, the phenomenon of electron trapping effect also indicates that the aqueous reactive species can be effectively generated only when more electrons act on the water sample.

Keyword :

plasma jet Aqueous reactive species kHz sinusoidal voltage pulse-modulated radio frequency (RF) voltage

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GB/T 7714 Xu, Han , Liu, Dingxin , Liu, Zhijie et al. Contrasting Characteristics of Gas-Liquid Reactive Species Induced by Pulse-Modulated RF and kHz Sinusoidal Plasma Jets [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2019 , 47 (2) : 1336-1344 .
MLA Xu, Han et al. "Contrasting Characteristics of Gas-Liquid Reactive Species Induced by Pulse-Modulated RF and kHz Sinusoidal Plasma Jets" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 47 . 2 (2019) : 1336-1344 .
APA Xu, Han , Liu, Dingxin , Liu, Zhijie , Wang, Weitao , Xia, Wenjie , Guo, Li et al. Contrasting Characteristics of Gas-Liquid Reactive Species Induced by Pulse-Modulated RF and kHz Sinusoidal Plasma Jets . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2019 , 47 (2) , 1336-1344 .
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Global model of an atmospheric-pressure capacitive discharge in helium with air impurities from 100 to 10000 ppm SCIE
期刊论文 | 2019 , 28 (3) | PLASMA SOURCES SCIENCE & TECHNOLOGY
WoS CC Cited Count: 1
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Abstract :

Helium is a common working gas for cold atmospheric plasmas (CAPs) and this is often mixed with other gases, such as oxygen and nitrogen, to increase its reactivity. Air is often found in these plasmas and it can be either introduced deliberately as a precursor or entrapped in systems that operate in open atmosphere. In either case, the presence of small traces of air can cause a profound change on the composition of the plasma and consequently its application efficacy. In this paper, a global model for He + Air CAPs is developed, in which 59 species and 866 volume reactions are incorporated, and a new boundary condition is used for the mass transport at the interface between the plasma and its surrounding air gas. The densities of reactive species and the power dissipation characteristics are obtained as a function of air concentrations spanning from 100 to 10 000 ppm. As the air concentration increases, the dominant cation changes from O-2(+) to NO+ and then to NO2+, the dominant anion changes from O-2(-) to NO2- and then to NO3-, the dominant ground state ROS changes from O to O-3, and the dominant ground state reactive nitrogen species changes from NO to HNO2. O-2 (a) is the most abundant metastable species and its density is orders of magnitude larger than other metastable species for all air concentrations considered in the study. Ion Joule heating is found important due to the electronegative nature of the plasma, which leads to the fast decrease of electron density when the air concentration is larger than 1000 ppm. The generation and loss pathways of important biologically relevant reactive species such as O, O-2(-), O-3, OH, H2O2, NO, HNO2, HNO3 are discussed and differences with the pathways observed in He + O-2 , He + H2O, Ar + Air and pure air plasmas are highlighted. Based on the simulation results, a simplified chemistry set with 47 species and 109 volume reactions is proposed. This simplified model greatly reduces the computational load while maintaining the accuracy of the simulation results within a factor of 2. The simplified chemistry model is computationally much less intensive, facilitating its integration into multidimensional fluid models for the study of the spatio-temporal evolution of He + Air CAPs.

Keyword :

He plus Air global model plasma

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GB/T 7714 Sun, Bowen , Liu, Dingxin , Iza, Felipe et al. Global model of an atmospheric-pressure capacitive discharge in helium with air impurities from 100 to 10000 ppm [J]. | PLASMA SOURCES SCIENCE & TECHNOLOGY , 2019 , 28 (3) .
MLA Sun, Bowen et al. "Global model of an atmospheric-pressure capacitive discharge in helium with air impurities from 100 to 10000 ppm" . | PLASMA SOURCES SCIENCE & TECHNOLOGY 28 . 3 (2019) .
APA Sun, Bowen , Liu, Dingxin , Iza, Felipe , Wang, Sui , Yang, Aijun , Liu, Zhijie et al. Global model of an atmospheric-pressure capacitive discharge in helium with air impurities from 100 to 10000 ppm . | PLASMA SOURCES SCIENCE & TECHNOLOGY , 2019 , 28 (3) .
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Decoupling analysis of the production mechanism of aqueous reactive species induced by a helium plasma jet SCIE
期刊论文 | 2019 , 28 (2) | PLASMA SOURCES SCIENCE & TECHNOLOGY
WoS CC Cited Count: 2
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Aqueous reactive species induced by gas plasmas play a dominant role in many plasma applications such as water purification and biomedicine, but their production mechanism is so far not well understood. In this paper, an experimental setup is designed to study the interaction between an AC helium plasma jet and PBS, which allows a decoupling analysis of the plasma-liquid processes on the production of aqueous reactive species. The processes include the dissolution of neutral reactive species, the electron absorption by dissolved oxygen, the deposition of positive ions, etc. Four aqueous reactive species including H2O2, O-2(-), OH and peroxynitrite (ONOOH/ONOO-) are detected, among which the peroxynitrite should originate from the air impurity in helium. It is found that the aqueous H2O2 and peroxynitrite are mainly dissolved from the gas phase, the aqueous O-2(-) is mainly generated by the electron absorption by dissolved oxygen, and the aqueous OH is mainly generated by the deposition of positive ions.

Keyword :

plasma jet aqueous reactive species production mechanism

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GB/T 7714 Chen, Zeyu , Liu, Dingxin , Xu, Han et al. Decoupling analysis of the production mechanism of aqueous reactive species induced by a helium plasma jet [J]. | PLASMA SOURCES SCIENCE & TECHNOLOGY , 2019 , 28 (2) .
MLA Chen, Zeyu et al. "Decoupling analysis of the production mechanism of aqueous reactive species induced by a helium plasma jet" . | PLASMA SOURCES SCIENCE & TECHNOLOGY 28 . 2 (2019) .
APA Chen, Zeyu , Liu, Dingxin , Xu, Han , Xia, Wenjie , Liu, Zhijie , Xu, Dehui et al. Decoupling analysis of the production mechanism of aqueous reactive species induced by a helium plasma jet . | PLASMA SOURCES SCIENCE & TECHNOLOGY , 2019 , 28 (2) .
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Transportation of ROS in model tissues treated by an Ar + O-2 plasma jet EI SCIE
期刊论文 | 2019 , 52 (4) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
WoS CC Cited Count: 1
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Abstract :

The transportation of reactive oxygen species (ROS) in model tissues treated by an Ar + O(2 )plasma jet was investigated in this paper. Gelatin gel was used to make the model tissues, and KI-starch reagent was used as an indicator of ROS including O-3, O and HO2. It was found that the transportation of ROS covered almost the whole surface of the model tissue with good uniformity, despite the small size of the plasma jet source. The center part of the model tissue was almost undyed, of which the area increased slightly with the gas flow rate. The surface pattern of ROS moved downwards with the inclination angle of plasma irradiation, because the molecular weight of argon is larger than that of air. This downward trend could be stopped by adding a certain amount of helium into the Ar + O-2 plasma jet, which is beneficial to precisely control the effective treatment area in clinical applications. Moreover, the dependence of the penetration depth of O-3 on the plasma treatment time or the water content of model tissues was formulated, with a similar trend but lower penetration speed than that of the He + O-2 plasma jet as reported previously.

Keyword :

model tissue plasma jet spatial-temporal distribution reactive oxygen species

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GB/T 7714 He, Tongtong , Liu, Dingxin , Liu, Zhijie et al. Transportation of ROS in model tissues treated by an Ar + O-2 plasma jet [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2019 , 52 (4) .
MLA He, Tongtong et al. "Transportation of ROS in model tissues treated by an Ar + O-2 plasma jet" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 52 . 4 (2019) .
APA He, Tongtong , Liu, Dingxin , Liu, Zhijie , Wang, Sui , Liu, Zhichao , Rong, Mingzhe et al. Transportation of ROS in model tissues treated by an Ar + O-2 plasma jet . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2019 , 52 (4) .
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Surface patterns of reactive species on model tissue treated by a surface air discharge SCIE
期刊论文 | 2019 , 52 (20) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
WoS CC Cited Count: 1
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Abstract :

Surface dielectric barrier discharge is capable of generating large-scale, flexible-shape and chemically active plasmas in open air, and hence has attracted much attention with relevance to clinical applications. An important application requirement is that the plasma treatment should have good homogeneity, which can be reflected by the surface distributions of reactive species on the treated sample. In this letter, a surface air discharge was used to treat a model tissue made of gelatin gel, and the surface distributions of H+, NO2- and O-3 were detected. When the air gap width between the plasma and the model tissue is 3 mm, it is found that the distributions have mesh patterns similar to that of the ground electrode, but O-3 concentrates on the edges of each mesh element, while NO2- and H+ concentrate in the center part. A wider air gap width benefits the mixing of reactive species but their surface distributions are more inhomogeneous, which should ascribe to a weak gas flow caused by the ionic wind and/or the gas heating effect. Gas flow can also be generated by rotating the plasma source, which is found to achieve a good homogeneity of treatment with a slow rotating speed of 1.2-2.4 rpm. This approach is easy to implement in clinical applications.

Keyword :

model tissue surface distributions surface air discharge reactive species

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GB/T 7714 He, Tongtong , Liu, Dingxin , Wang, Bingchuan et al. Surface patterns of reactive species on model tissue treated by a surface air discharge [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2019 , 52 (20) .
MLA He, Tongtong et al. "Surface patterns of reactive species on model tissue treated by a surface air discharge" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 52 . 20 (2019) .
APA He, Tongtong , Liu, Dingxin , Wang, Bingchuan , Wang, Weitao , Liu, Zhichao , Guo, Li et al. Surface patterns of reactive species on model tissue treated by a surface air discharge . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2019 , 52 (20) .
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Investigation on the RONS and bactericidal effects induced by He + O2 cold plasma jets: In open air and in an airtight chamber EI Scopus SCIE
期刊论文 | 2018 , 25 (11) | Physics of Plasmas
SCOPUS Cited Count: 2
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© 2018 Author(s). He + O2 plasma jets in open air and in an airtight chamber are comparatively studied, with respect to their production of gaseous/aqueous reactive species and their antibacterial effects. Under the same discharge power, the plasma jet in open air has higher densities of gaseous reactive species and a higher concentration of aqueous H2O2 but lower concentrations of aqueous OH and O2 -. In addition, the increase in the O2 ratio in He in both plasma jets causes a linear decrease in the population of gaseous reactive species, except for O(3p5P) when a small amount of O2 is added to the working gas. The concentrations of aqueous reactive species for OH and H2O2 also drop monotonically with the increase in additive O2, while the aqueous O2 - first increases and then decreases. Moreover, it is interesting that the bactericidal inactivation in the airtight chamber condition is much greater than that in the open air condition regardless of the presence or absence of additive O2 in the He plasma jet. The concentration trends of O2 - for both the plasma jets are similar to their antibacterial effects, and little antibacterial effect is achieved when a scavenger of O2 - is used, indicating that O2 - should be a main antibacterial agent. Moreover, it should not be O2 - alone to achieve the antibacterial effect, and some reactive nitrogen species such as ONOO- and O2NOO- might also play an important role.

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GB/T 7714 Xu, Han , Liu, Dingxin , Wang, Weitao et al. Investigation on the RONS and bactericidal effects induced by He + O2 cold plasma jets: In open air and in an airtight chamber [J]. | Physics of Plasmas , 2018 , 25 (11) .
MLA Xu, Han et al. "Investigation on the RONS and bactericidal effects induced by He + O2 cold plasma jets: In open air and in an airtight chamber" . | Physics of Plasmas 25 . 11 (2018) .
APA Xu, Han , Liu, Dingxin , Wang, Weitao , Liu, Zhijie , Guo, Li , Rong, Mingzhe et al. Investigation on the RONS and bactericidal effects induced by He + O2 cold plasma jets: In open air and in an airtight chamber . | Physics of Plasmas , 2018 , 25 (11) .
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Post-discharge evolution of reactive species in the water activated by a surface air plasma: a modeling study EI SCIE Scopus
期刊论文 | 2018 , 51 (17) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

Plasma-activated water (PAW) has been reported to sustain a bactericidal ability for months. However, many reactive species regarded as the main antibacterial agents in PAW have short lifetimes of less than one second. In order to explain the prolonged antibacterial ability of PAW and predict how to extend its effective time, we studied the post-discharge evolution of reactive species in PAW based on a system-level model reported previously. Three common storage conditions for PAW were considered within the post-discharge time of 14 d: (I) leaving the residual gas and PAW in the sealed reactor; (II) leaving PAW in the open air; (III) sealing the container of PAW. In comparison, storage condition III was the best condition to preserve the long-lived species including H2O2 and HNO2/NO2-, whereas storage condition I was the best method to preserve the short-lived species including OH, HO2 and ONOOH/ONOO-. It suggests that the gas-liquid mass transfer plays an important role in the evolution of reactive species. We also found that O2NOOH/O2NOO- had an almost one order of magnitude higher concentration and a longer residue time than those of ONOOH/ONOO-. This distinction suggests that the biological effect of O2NOOH/O2NOO- may be important.

Keyword :

post-discharge evolution plasma-activated water mass transfer residue time reactive species

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GB/T 7714 Liu, Z. C. , Liu, D. X. , Chen, C. et al. Post-discharge evolution of reactive species in the water activated by a surface air plasma: a modeling study [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (17) .
MLA Liu, Z. C. et al. "Post-discharge evolution of reactive species in the water activated by a surface air plasma: a modeling study" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 51 . 17 (2018) .
APA Liu, Z. C. , Liu, D. X. , Chen, C. , Liu, Z. J. , Yang, A. J. , Rong, M. Z. et al. Post-discharge evolution of reactive species in the water activated by a surface air plasma: a modeling study . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (17) .
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Inactivation of myeloma cancer cells by helium and argon plasma jets: The effect comparison and the key reactive species EI SCIE Scopus
期刊论文 | 2018 , 25 (2) | PHYSICS OF PLASMAS
SCOPUS Cited Count: 4
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In plasma cancer therapy, the inactivation of cancer cells under plasma treatment is closely related to the reactive oxygen and nitrogen species (RONS) induced by plasmas. Quantitative study on the plasma-induced RONS that related to cancer cells apoptosis is critical for advancing the research of plasma cancer therapy. In this paper, the effects of several reactive species on the inactivation of LP-1 myeloma cancer cells are comparatively studied with variable working gas composition, surrounding gas composition, and discharge power. The results show that helium plasma jet has a higher cell inactivation efficiency than argon plasma jet under the same discharge power. By comparing the concentration of aqueous phase reactive species and the cell inactivation efficiency under different working gases and discharge powers, it is demonstrated that the inactivation efficiency of LP-1 myeloma cancer cells is strongly correlated with the concentration of peroxynitrite (ONOOH/ONOO-). Published by AIP Publishing.

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GB/T 7714 Chen, Zeyu , Cui, Qingjie , Chen, Chen et al. Inactivation of myeloma cancer cells by helium and argon plasma jets: The effect comparison and the key reactive species [J]. | PHYSICS OF PLASMAS , 2018 , 25 (2) .
MLA Chen, Zeyu et al. "Inactivation of myeloma cancer cells by helium and argon plasma jets: The effect comparison and the key reactive species" . | PHYSICS OF PLASMAS 25 . 2 (2018) .
APA Chen, Zeyu , Cui, Qingjie , Chen, Chen , Xu, Dehui , Liu, Dingxin , Chen, H. L. et al. Inactivation of myeloma cancer cells by helium and argon plasma jets: The effect comparison and the key reactive species . | PHYSICS OF PLASMAS , 2018 , 25 (2) .
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Comparison between the water activation effects by pulsed and sinusoidal helium plasma jets EI SCIE Scopus
期刊论文 | 2018 , 25 (1) | PHYSICS OF PLASMAS
WoS CC Cited Count: 4 SCOPUS Cited Count: 4
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Comparisons between pulsed and sinusoidal plasma jets have been extensively reported for the discharge characteristics and gaseous reactive species, but rarely for the aqueous reactive species in water solutions treated by the two types of plasma jets. This motivates us to compare the concentrations of aqueous reactive species induced by a pulsed and a sinusoidal plasma jet, since it is widely reported that these aqueous reactive species play a crucial role in various plasma biomedical applications. Experimental results show that the aqueous H2O2, OH/O-2(-), and O-2(-)/ONOO- induced by the pulsed plasma jet have higher concentrations, and the proportional difference increases with the discharge power. However, the emission intensities of OH(A) and O(3p(5)P) are higher for the sinusoidal plasma jet, which may be attributed to its higher gas temperature since more water vapor could participate in the plasma. In addition, the efficiency of bacterial inactivation induced by the pulsed plasma jet is higher than that for the sinusoidal plasma jet, in accordance with the concentration relation of aqueous reactive species for the two types of plasma jets. Published by AIP Publishing.

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GB/T 7714 Xu, Han , Liu, Dingxin , Xia, Wenjie et al. Comparison between the water activation effects by pulsed and sinusoidal helium plasma jets [J]. | PHYSICS OF PLASMAS , 2018 , 25 (1) .
MLA Xu, Han et al. "Comparison between the water activation effects by pulsed and sinusoidal helium plasma jets" . | PHYSICS OF PLASMAS 25 . 1 (2018) .
APA Xu, Han , Liu, Dingxin , Xia, Wenjie , Chen, Chen , Wang, Weitao , Liu, Zhijie et al. Comparison between the water activation effects by pulsed and sinusoidal helium plasma jets . | PHYSICS OF PLASMAS , 2018 , 25 (1) .
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Analysis of the production mechanism of H2O2 in water treated by helium DC plasma jets EI SCIE Scopus
期刊论文 | 2018 , 51 (32) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
WoS CC Cited Count: 6 SCOPUS Cited Count: 3
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Abstract :

In this paper, helium plasma jets are used for water activation to explore the production mechanism of H2O2 in the water. Either positive or negative DC voltage is used for the plasma excitation. It is found that the concentration of aqueous H2O2 induced by the positive plasma jet is similar to 4 times larger than that by the negative plasma jet with similar average discharge current. Three production pathways of aqueous H2O2 are considered important in literature, including the electrolysis, the dissolution of gaseous H2O2, and the combination of aqueous OH. However, the first two pathways are found to have similar contributions on H2O2 production for the positive and negative plasma jets. It is deduced that the OH combination in the surface layer of the plasma-activated water is most responsible for the concentration difference of aqueous H2O2 between the two plasma jets.

Keyword :

cathode sheath electrolysis hydrogen peroxide plasma jet

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GB/T 7714 Chen, Zeyu , Liu, Dingxin , Chen, Chen et al. Analysis of the production mechanism of H2O2 in water treated by helium DC plasma jets [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (32) .
MLA Chen, Zeyu et al. "Analysis of the production mechanism of H2O2 in water treated by helium DC plasma jets" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 51 . 32 (2018) .
APA Chen, Zeyu , Liu, Dingxin , Chen, Chen , Xu, Dehui , Liu, Zhijie , Xia, Wenjie et al. Analysis of the production mechanism of H2O2 in water treated by helium DC plasma jets . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2018 , 51 (32) .
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