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Influence of bias voltage and oxygen addition on the discharge aspects of a diffuse argon plume in an atmospheric pressure plasma jet
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作者 Pengying JIA Guoxin HAN +6 位作者 Xiupin DONG Kaiyue WU Junxia RAN Xuexia PANG Xuexue ZHANG Jiacun WU Xuechen LI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第12期75-81,共7页
A remote plasma,also referred to as a plasma plume(diffuse or filamentary),is normally formed downstream of an atmospheric pressure plasma jet.In this study,a diffuse plume is formed by increasing the bias voltage(U_(... A remote plasma,also referred to as a plasma plume(diffuse or filamentary),is normally formed downstream of an atmospheric pressure plasma jet.In this study,a diffuse plume is formed by increasing the bias voltage(U_(b))applied to the downstream electrode of an argon plasma jet excited by a negatively pulsed voltage.The results indicate that the plume is filamentary when U_(b)is low,which transits to the diffuse plume with increasing U_(b).The discharge initiated at the rising edge of the pulsed voltage is attributed to the diffuse plume,while that at the falling edge contributes to the filament in the plume.For the diffuse plume,the discharge intensity decreases with the increasing oxygen content(C_o).Fast photography reveals that the diffuse plume results from a negative streamer,which has a dark region near the nozzle with C_o=0%.However,the dark region is absent with C_o=0.5%.From the optical emission spectrum,the electron density,electron excitation temperature,gas temperature,and oxygen atom concentration are investigated. 展开更多
关键词 atmospheric pressure plasma jet diffuse plasma plume optical emission spectrum
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Investigation of paint removal by atmospheric pressure plasma jet 被引量:1
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作者 王志君 陈忠文 +1 位作者 康皓 叶宗标 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第8期130-140,共11页
Acrylic polyurethane paint on the surface of 2A12 Al alloy was cleaned utilizing an atmospheric pressure plasma jet in this work.The dynamic evolution of the paint removal process during plasma treatment with time was... Acrylic polyurethane paint on the surface of 2A12 Al alloy was cleaned utilizing an atmospheric pressure plasma jet in this work.The dynamic evolution of the paint removal process during plasma treatment with time was explored through analysis of morphology and chemical states.The results showed that although the thickness of paint could be reduced effectively with an increase in cleaning time,the removal rate of paint gradually decreased with time.During the initial cleaning process range,its original smooth morphology of paint turned rugged quickly and was almost unchanged with further plasma treatment.Element and chemical state analysis showed that the content of C in the paint layer decreased obviously after plasma treatment.In contrast,the O content increased remarkably.The cleaning mechanism could be mainly attributed to the reaction between active O-containing species in air plasma and organic components in the paint.After removal of superficial organic matter,residue inorganic metal oxide substances aggregated on the base.The exposed metal oxides on the one hand elevated the superficial O content,but on the other hand hindered further plasma penetration,resulting in a gradual decrease in cleaning rate with cleaning time.Therefore,physical wiping was proposed to be incorporated with the plasma method and effective removal of paint was realized. 展开更多
关键词 atmospheric pressure plasma jet paint removal dynamic evolution
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Compared discharge characteristics and film modifications of atmospheric pressure plasma jets with two different electrode geometries
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作者 陈雄 王兴权 +2 位作者 张彬祥 袁明 杨思泽 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第11期537-544,共8页
Atmospheric pressure plasma jet shows great potential for polymer film processing. The electrode geometry is the key factor to determine discharge characteristics and film modification of jets. In this paper, we compa... Atmospheric pressure plasma jet shows great potential for polymer film processing. The electrode geometry is the key factor to determine discharge characteristics and film modification of jets. In this paper, we compared the discharge characteristics and the film modifications of atmospheric pressure plasma jets with needle-ring electrode(NRE) and doublering electrode(DRE). The results show that jet with NRE has stronger electric field intensity and higher discharge power,making it present more reactive oxygen particles and higher electron temperature, but its discharge stability is insufficient.In contrast, the jet with DRE has uniform electric field distribution of lower field intensity, which allows it to maintain stable discharge over a wide range of applied voltages. Besides, the modification results show that the treatment efficiency of PET film by NRE is higher than that by DRE. These results provide a suitable atmospheric pressure plasma jets device selection scheme for polymer film processing process. 展开更多
关键词 atmospheric pressure plasma jet electrode structure jet characteristics MODIFICATION
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Atmospheric Pressure Plasma Jet in Ar and O_2/Ar Mixtures:Properties and High Performance for Surface Cleaning 被引量:4
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作者 金英 任春生 +2 位作者 杨亮 张家良 王德真 《Plasma Science and Technology》 SCIE EI CAS CSCD 2013年第12期1203-1208,共6页
An atmospheric pressure plasma jet generated in Ar and O2/Ar mixtures has been investigated by specially designed equipment with double power electrodes at 20~32 kHz, and their effects on the cleaning of surfaces have... An atmospheric pressure plasma jet generated in Ar and O2/Ar mixtures has been investigated by specially designed equipment with double power electrodes at 20~32 kHz, and their effects on the cleaning of surfaces have been studied. Properties of the jet discharge are studied by electrical diagnostics, including the waveform of discharge voltage, discharge current and the Q-V Lissajous figures. The optical emission spectroscopy is used to measure the plasma parameters, such as the excitation temperature and the gas temperature. It is found that the consumed power and the excitation temperature increase with increase of the discharge frequency. On the other hand, at the same discharge frequency, these parameters in O2/Ar mixture plasma are found to be much larger. The effect on surface cleaning is studied from the changes in the contact angle. For Ar plasma jet, the contact angle decreases with increase of the discharge frequency. For O2/Ar mixture plasma jet, the contact angle decreases with increase of discharge frequency up to 26 kHz, however, further increase of discharge frequency does not show further decrease in the contact angle. At the same discharge frequency, the contact angle after O2/Ar mixture plasma cleaning is found to be much lower compared to the case of pure Ar. From the results of quadrupole mass-spectrum analysis, we can identify more fragment molecules of CO and H2O in the emitted gases after O2/Ar plasma jet treatment compared with Ar plasma jet treatment, which are produced by the decomposition of surface organic contaminants during the cleaning process. 展开更多
关键词 atmospheric pressure plasma jet surface cleaning the excitation temperature the contact angle quadrupole mass-spectrum
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Development of an atmospheric fluorocarbon plasma jet generated by pulse modulated microwave discharge
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作者 陈思乐 任鑫柳 +5 位作者 陈兆权 徐笑娟 程涛 李平 张冠军 卢新培 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第11期91-100,共10页
Atmospheric fluorocarbon plasma plays an important role in the surface modification of insulating materials like polymers.The existing fluorocarbon plasma is usually generated by dielectric barrier discharge,which has... Atmospheric fluorocarbon plasma plays an important role in the surface modification of insulating materials like polymers.The existing fluorocarbon plasma is usually generated by dielectric barrier discharge,which has a low concentration of reactive species and may cause insufficient surface fluorination.This work attempts to develop an atmospheric fluorocarbon plasma jet using a coaxial transmission line resonator by microwave discharge with locally enhanced electric field and high density.The gas temperature is reduced by pulse modulation technology.Three kinds of working gases,pure CF_(4),Ar/CF_(4)and He/CF_(4),are utilized to generate the atmospheric microwave fluorocarbon plasma jet.The discharge images,optical emission spectra,electron densities and gas temperatures are studied experimentally.The results show that the Ar/CF_(4)plasma jet has the best comprehensive performance,such as strong discharge intensity and controllable gas temperature.The electron density of the Ar/CF_4plasma jet has a magnitude of 10~(20)m^(-3),indicating a higher density than that of the frequently used dielectric barrier discharge.With the other conditions unchanged,the gas temperature at the end of the Ar/CF_(4)plasma jet can be reduced from 410.2 to 347.3 K by decreasing the duty cycle of the modulated pulse from 0.5 to 0.1.Thence,the microwave Ar/CF_(4)plasma jet is considered to be a promising fluorocarbon plasma source for surface fluorination of polymers. 展开更多
关键词 microwave discharge atmospheric pressure plasma jet fluorocarbon plasma(Some figures may appear in colour only in the online journal)
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Surface Decontamination of Chemical Agent Surrogates Using an Atmospheric Pressure Air Flow Plasma Jet 被引量:2
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作者 李战国 李颖 +1 位作者 曹鹏 赵红杰 《Plasma Science and Technology》 SCIE EI CAS CSCD 2013年第7期696-701,共6页
An atmospheric pressure dielectric barrier discharge (DBD) plasma jet generator using air flow as the feedstock gas was applied to decontaminate the chemical agent surrogates on the surface of aluminum, stainless st... An atmospheric pressure dielectric barrier discharge (DBD) plasma jet generator using air flow as the feedstock gas was applied to decontaminate the chemical agent surrogates on the surface of aluminum, stainless steel or iron plate painted with alkyd or PVC. The experi- mental results of material decontamination show that the residual chemical agent on the material is lower than the permissible value of the National Military Standard of China. In order to test the corrosion effect of the plasma jet on different material surfaces in the decontamination pro-cess, corrosion tests for the materials of polymethyl methacrylate, neoprene, polyvinyl chloride (PVC), polyethylene (PE), phenolic resin, iron plate painted with alkyd, stainless steel, aluminum, etc. were carried out, and relevant parameters were examined, including etiolation index, chroma- tism, loss of gloss, corrosion form, etc. The results show that the plasma jet is slightly corrosive for part of the materials, but their performances are not affected. A portable calculator, computer display, mainboard, circuit board of radiogram, and a hygrometer could work normally after being treated by the plasma jet. 展开更多
关键词 surface decontamination chemical agents atmospheric pressure plasma jet dielectric barrier discharge (DBD) air flow dischargeDAF'~. co ~
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Development of a new atmospheric pressure cold plasma jet generator and application in sterilization 被引量:2
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作者 程诚 刘鹏 +3 位作者 徐营 张力叶 詹如娟 张文锐 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第7期1544-1548,共5页
This paper reports that a new plasma generator at atmospheric pressure, which is composed of two homocentric cylindrical all-metal tubes, successfully generates a cold plasma jet. The inside tube electrode is connecte... This paper reports that a new plasma generator at atmospheric pressure, which is composed of two homocentric cylindrical all-metal tubes, successfully generates a cold plasma jet. The inside tube electrode is connected to ground, the outside tube electrode is connected to a high-voltage power supply, and a dielectric layer is covered on the outside tube electrode. When the reactor is operated by low-frequency (6 kHz-20 kHz) AC supply in atmospheric pressure and argon is steadily fed as a discharge gas through inside tube electrode, a cold plasma jet is blown out into air and the plasma gas temperature is only 25-30℃. The electric character of the discharge is studied by using digital real-time oscilloscope (TDS 200-Series), and the discharge is capacitive. Preliminary results are presented on the decontamination of E.colis bacteria and Bacillus subtilis bacteria by this plasma jet, and an optical emission analysis of the plasma jet is presented in this paper. The ozone concentration generated by the plasma jet is 1.0× 10^16cm^-3 which is acquired by using the ultraviolet absorption spectroscopy. 展开更多
关键词 atmospheric pressure cold plasma jet STERILIZATION spectral measurement
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Characteristics of a kHz helium atmospheric pressure plasma jet interacting with two kinds of targets 被引量:1
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作者 Guimin XU Yue GENG +2 位作者 Xinzhe LI Xingmin SHI Guanjun ZHANG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2021年第9期74-85,共12页
This study investigates the influence of two types of target,skin tissue and cell culture medium,with different permittivities on a k Hz helium atmospheric pressure plasma jet(APPJ)during its application for wound hea... This study investigates the influence of two types of target,skin tissue and cell culture medium,with different permittivities on a k Hz helium atmospheric pressure plasma jet(APPJ)during its application for wound healing.The basic optical-electrical characteristics,the initiation and propagation and the emission spectra of the He APPJ under different working conditions are explored.The experimental results show that,compared with a jet freely expanding in air,the diameter and intensity of the plasma plume outside the nozzle increase when it interacts with the pigskin and cell culture medium targets,and the mean velocity of the plasma bullet from the tube nozzle to a distance of 15 mm is also significantly increased.There are also multiple increases in the relative intensity of OH(A^(2)Σ→X^(2)Π)and O(3p^(5)S-3s^(5)S)at a position 15 mm away from nozzle when the He APPJ interacts with cell culture medium compared with the air and pigskin targets.Taking the surface charging of the low permittivity material capacitance and the strengthened electric field intensity into account,they make the various characteristics of He APPJ interacting with two different targets together. 展开更多
关键词 atmospheric pressure plasma jet INTERACTION cell culture medium skin tissue wound healing
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Cleaning of nitrogen-containing carbon contamination by atmospheric pressure plasma jet 被引量:1
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作者 Li YANG Sishu WANG +8 位作者 Andong WU Bo CHEN Jianjun CHEN Hongbin WANG Shuwei CHEN Jianjun WEI Kun ZHANG Zongbiao YE Fujun GOU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第10期127-138,共12页
Atmospheric pressure plasma jet(APPJ)was used to clean nitrogen-containing carbon films(C–N)fabricated by plasma-assisted chemical vapor deposition method employing the plasma surface interaction linear device at Sic... Atmospheric pressure plasma jet(APPJ)was used to clean nitrogen-containing carbon films(C–N)fabricated by plasma-assisted chemical vapor deposition method employing the plasma surface interaction linear device at Sichuan University(SCU-PSI).The properties of the contaminated films on the surface of pristine and He-plasma pre-irradiated tungsten matrix,such as morphology,crystalline structure,element composition and chemical structure were characterized by scanning electron microscopy,grazing incidence x-ray diffraction and x-ray photoelectron spectroscopy.The experimental results revealed that the removal of C–N film with a thickness of tens of microns can be realized through APPJ cleaning regardless of the morphology of the substrates.Similar removal rates of 16.82 and 13.78μm min^(-1)were obtained for C–N films deposited on a smooth pristine W surface and rough fuzz-covered W surface,respectively.This is a remarkable improvement in comparison to the traditional cleaning method.However,slight surface oxidation was found after APPJ cleaning,but the degree of oxidation was acceptable with an oxidation depth increase of only 3.15 nm.Optical emission spectroscopy analysis and mass spectrometry analysis showed that C–N contamination was mainly removed through chemical reaction with reactive oxygen species during APPJ treatment using air as the working gas.These results make APPJ cleaning a potentially effective method for the rapid removal of C–N films from the wall surfaces of fusion devices. 展开更多
关键词 N-containing C(C–N)film plasma-assisted chemical vapor deposition He-plasma irradiation atmospheric pressure plasma jet plasma cleaning
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Numerical study of the effect of water content on OH production in a pulsed-dc atmospheric pressure helium–air plasma jet 被引量:1
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作者 钱沐杨 杨从影 +3 位作者 王震东 陈小昌 刘三秋 王德真 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第1期683-689,共7页
A numerical study of the effect of water content on OH production in a pulsed-dc atmospheric pressure helium-air plasma jet is presented. The generation and loss mechanisms of the OH radicals in a positive half-cycle ... A numerical study of the effect of water content on OH production in a pulsed-dc atmospheric pressure helium-air plasma jet is presented. The generation and loss mechanisms of the OH radicals in a positive half-cycle of the applied voltage are studied and discussed. It is found that the peak OH density increases with water content in air (varying from 0% to 1%) and reaches 6.3 x 10^18 m-3 when the water content is 1%. Besides, as the water content increases from 0.01% to 1%, the space-averaged reaction rate of three-body recombination increases dramatically and is comparable to those of main OH generation reactions. 展开更多
关键词 atmospheric pressure plasma jet OH radicals plasma simulation
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An Indirect Method for Measuring Electron Density of Atmospheric Pressure Plasma Jets 被引量:1
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作者 刘莉莹 张家良 王德真 《Plasma Science and Technology》 SCIE EI CAS CSCD 2009年第6期693-698,共6页
An indirect method for measuring the electron density of radio frequency atmospheric pressure plasma jets (RF-APPJ) based on the discharge voltage and current waveforms is presented. An equivalent circuit of the pla... An indirect method for measuring the electron density of radio frequency atmospheric pressure plasma jets (RF-APPJ) based on the discharge voltage and current waveforms is presented. An equivalent circuit of the plasma discharge is assumed by taking into account the electrode capacitance, serial resistance and inductance of the bulk plasma, as well as the sheath impedance. Based on the circuit model, the electron density can be obtained according to Ohm's law. By using this method, the effects of the electrode shape and discharge gap on the electron density are discussed. 展开更多
关键词 atmospheric pressure plasma jets radio frequency discharge electron density
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Characteristics of Low Power CH_4/Air Atmospheric Pressure Plasma Jet
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作者 张军 肖德志 +5 位作者 方世东 舒兴胜 左潇 程诚 孟月东 王守国 《Plasma Science and Technology》 SCIE EI CAS CSCD 2015年第3期202-208,共7页
A low power atmospheric pressure plasma jet driven by a 24 kHz AC power source and operated with a CH4/air gas mixture has been investigated by optical emission spectrometer. The plasma parameters including the electr... A low power atmospheric pressure plasma jet driven by a 24 kHz AC power source and operated with a CH4/air gas mixture has been investigated by optical emission spectrometer. The plasma parameters including the electron excitation temperature, vibrational temperature and rotational temperature of the plasma jet at different discharge powers are diagnosed based on the assumption that the kinetic energy of the species obeys the Boltzmann distribution. The electron density at different power is also investigated by HS Stark broadening. The results show that the plasma source works under non-equilibrium conditions. It is also found that the vibrational temperature and rotational temperat;ure increase with discharge power, whereas the electron excitation temperature seems to have a downward trend. The electron density increases from 0.8×10^21 m^-3 to 1.1×10^21 m^-3 when the discharge power increases from 53 W to 94 W. 展开更多
关键词 atmospheric pressure plasma jet optical emission spectroscopy rotational temperature vibrational temperature excitation temperature electron density
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The Effects of Gas Composition on the Atmospheric Pressure Plasma Jet Modification of Polyethylene Films
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作者 孙洁 邱夷平 《Plasma Science and Technology》 SCIE EI CAS CSCD 2015年第5期402-408,共7页
Polyethylene (PE) films are treated using an atmospheric pressure plasma jet (APPJ) with He or He/O2 gas for different periods of time. The influence of gas type on the plasma polymer interactions is studied. The ... Polyethylene (PE) films are treated using an atmospheric pressure plasma jet (APPJ) with He or He/O2 gas for different periods of time. The influence of gas type on the plasma polymer interactions is studied. The surface contact angle of the PE film can be effectively lowered to 58° after 20 s of He/O2 plasma treatment and then remains almost unchanged for longer treatment durations, while, for He plasma treatment, the film surface contact angle drops gradually to 47° when the time reaches 120 s. Atomic force microscopy (AFM) results show that the root mean square (RMS) roughness was significantly higher for the He/O2 plasma treated samples than for the He plasma treated counterparts, and the surface topography of the He/O2 plasma treated PE films displays evenly distributed dome-shaped small protuberances. Chemical composition analysis reveals that the He plasma treated samples have a higher oxygen content but a clearly lower percentage of COO than the comparable He/O2 treated samples, suggesting that differences exist in the mode of incorporating oxygen between the two gas condition plasma treatments. Electron spin resonance (ESR) results show that the free radical concentrations of the He plasma treated samples were clearly higher than those of the He/O2 plasma treated ones with other conditions unchanged. 展开更多
关键词 atmospheric pressure plasma jet PE film WETTABILITY free radicals plasma- polymer interactions
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Optical Spectroscopic Investigation of Ar/CH_3OH and Ar/N_2/CH_3OH Atmospheric Pressure Plasma Jets
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作者 周永杰 袁强华 +2 位作者 王晓敏 殷桂琴 董晨钟 《Plasma Science and Technology》 SCIE EI CAS CSCD 2014年第2期99-103,共5页
Ar/CH3OH and Ar/N2/CH3OH plasma jets were generated at atmospheric pressure by dual-frequency excitations. Two different cases were studied with focus laid on the generation of CN radicals. In one case Ar gas passed t... Ar/CH3OH and Ar/N2/CH3OH plasma jets were generated at atmospheric pressure by dual-frequency excitations. Two different cases were studied with focus laid on the generation of CN radicals. In one case Ar gas passed through a bubbler with saturated methanol steam but without addition of N2 (Ar/CH3OH plasma). In the other case N2 passed through the bubbler with saturated methanol steam (Ar/N2/CH3OH plasma). The optical emission lines of CN radicals have been observed in these two cases of plasma discharges. The addition of N2 can significantly increase the optical emission intensity of CN bands. 展开更多
关键词 atmospheric pressure plasma jet carbonaceous species optical emission spec- troscopy dual-frequency excitation
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Atmospheric Pressure Plasma Jet in Organic Solution:Spectra,Degradation Effects of Solution Flow Rate and Initial pH Value
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作者 陈秉岩 朱昌平 +5 位作者 陈龙威 费峻涛 高莹 文文 单鸣雷 任兆杏 《Plasma Science and Technology》 SCIE EI CAS CSCD 2014年第12期1126-1134,共9页
The organic compounds of p-nitrophenol (PNP) solution was treated by the active species generated in a stirred reactor by an atmospheric pressure plasma jet (APPJ). The emission intensities of hydroxyl (OH), oxy... The organic compounds of p-nitrophenol (PNP) solution was treated by the active species generated in a stirred reactor by an atmospheric pressure plasma jet (APPJ). The emission intensities of hydroxyl (OH), oxygen (O), nitric oxide (NO), hydrogen (H) and molecular (N2) were measured by optical emission spectroscopy (OES). The relations between the flow rates of the PNP solution and degradation, the degradation effects and initial pH value of the solution were also investigated. Experimental results show that there exist intense emissions of O (777.1 nm), N(337.1 nm), OH (306-310 nm) and NO band (200-290 nm) in the region of plasma. Given the treatment time and gas flow rate, the degradation increased as a function of discharge energy and solution flow rate, respectively. The solution flow rate for the most efficient degradation ranged from 1.414 m/s to 1.702 m/s, and contributed very little when it exceeded 2.199 m/s. This indicates the existence of diffusion-controlled reactions at a low solution flow rate and activation- controlled reactions at a high solution flow rate. Moreover, increasing or decreasing the initial pH value of neutral PNP solution (pH=5.95) could improve the degradation efficiency. Treated by APPJ, the PNP solutions with different initial pH values of 5.95, 7.47 and 2.78 turned more acidic in the end, while the neutral solution had the lowest degradation efficiency. This work clearly demonstrates the close coupling of active species, photolysis of ultraviolet, the organic solution flow rate and the initial pH value, and thus is helpful in the study of the mechanism and application of plasma in wastewater treatment. 展开更多
关键词 atmospheric pressure plasma jet active species organic solution degradation optical emission spectroscopy (OES)
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Sterilization of mycete attached on the unearthed silk fabrics by an atmospheric pressure plasma jet
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作者 Rui Zhang Jin-song Yu +5 位作者 Jun Huang Guang-liang Chen Xin Liu Wei Chen Xing-quan Wang Chao-rong Li 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第5期390-399,共10页
The sterilization of the simulated unearthed silk fabrics using an atmospheric pressure plasma jet(APPJ) system employing Ar/O2 or He/O2 plasma to inactivate the mycete attached on the silk fabrics is reported. The ... The sterilization of the simulated unearthed silk fabrics using an atmospheric pressure plasma jet(APPJ) system employing Ar/O2 or He/O2 plasma to inactivate the mycete attached on the silk fabrics is reported. The effects of the APPJ characteristics(particularly the gas type and discharge power) on the fabric strength, physical-chemical structures,and sterilizing efficiency were investigated. Experimental results showed that the Ar/O2 APPJ plasma can inactivate the mycete completely within 4.0 min under a discharge power of 50.0 W. Such an APPJ treatment had negligible impact on the mechanical strength of the fabric and the surface chemical characteristics. Moreover, the Ar ions, O and OH radicals were shown to play important roles on the sterilization of the mycete attached on the unearthed silk fabrics. 展开更多
关键词 unearthed silk fabric mycete sterilization atmospheric pressure plasma jet (APPJ) sterilization mechanism
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Observation of the Emission Spectra of an Atmospheric Pressure Radio-frequency Plasma Jet
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作者 王百荣 朱文超 蒲以康 《Plasma Science and Technology》 SCIE EI CAS CSCD 2005年第5期3045-3047,共3页
An atmospheric pressure plasma jet (APPJ) using radio-frequency (13.56 MHz) power has been developed to produce homogeneous glow discharge at low temperature. With optical emission spectroscopy, we observed the ex... An atmospheric pressure plasma jet (APPJ) using radio-frequency (13.56 MHz) power has been developed to produce homogeneous glow discharge at low temperature. With optical emission spectroscopy, we observed the excited species (atomic helium, atomic oxygen and metastable oxygen) generated in this APPJ and their dependence on gas composition ratio and RF power. O and O2(b1∑g^+) are found in the effluent outside the jet by measuring the emission spectra of effluent perpendicular to the jet. An interesting phenomenon is found that there is an abnormal increase of O emission intensity (777.4 nm) between 10 mm and 40 mm away from the nozzle. This observation result is very helpful in practical operation. 展开更多
关键词 low temperature plasma atmospheric pressure plasma jet optical emissionspectroscopy
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Efficacy of Atmospheric Pressure Plasma as an Antibacterial Agent Against Enterococcus Faecalis in Vitro 被引量:3
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作者 曹颖光 杨平 +4 位作者 卢新培 熊紫兰 叶涛 熊青 孙自镛 《Plasma Science and Technology》 SCIE EI CAS CSCD 2011年第1期93-98,共6页
Enterococcus faecalis (E. faecalis) is a microorganism that can survive extreme challenges in obturated root canals. The aim of this study was to evaluate the efficacy of a non-thermal atmospheric pressure plasma pl... Enterococcus faecalis (E. faecalis) is a microorganism that can survive extreme challenges in obturated root canals. The aim of this study was to evaluate the efficacy of a non-thermal atmospheric pressure plasma plume against E. faecalis in vitro. A non-thermal atmospheric pressure plasma jet device which could generate a cold plasma plume carrying a peak current of 300 mA was used. The antibacterial efficacy of this device against E. faecalis and its biofihn un- der different conditions was detected. The antibacterial efficacy of the plasma against E. faecalis and Staphylococcus aureus (S. aureus) was also evaluated. After plasma treatment, the average diameter of inhibition zone on S. aureus and E. faecalis was 2.62±0.26 cm and 1.06±0.30 cm, respectively (P 〈 0.05). The diameter was increased with prolongation of the treatment dura- tion. The diameters of inhibition zone of the sealed Petri dishes were larger than those of the uncovered Petri dishes. There was significant difference in colony-forming units between plasma group and control group on E. faecalis biofilm (P 〈 0.01). The transmission electron microscopy revealed that the ultrastructural changes eytoderm of E. faecalis were observed after treatment for 2min. It is concluded that the non-thermal atmospheric pressure plasma could serve as an effective adjunct to standard endodontie microbial treatment. 展开更多
关键词 non-thermal atmospheric pressure plasma jet Enterococcus faecalis Staphy- lococcus aureus
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Three different low-temperature plasma-based methods for hydrophilicity improvement of polyethylene films at atmospheric pressure 被引量:2
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作者 陈光良 郑旭 +4 位作者 黄俊 司晓蕾 陈致力 薛飞 Sylvain Massey 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第11期411-417,共7页
Three different low-temperature plasma-based methods were used to improve the surface hydrophilicity of polyethy- lene (PE) films, and all the modification processes were carried out by employing an atmospheric pres... Three different low-temperature plasma-based methods were used to improve the surface hydrophilicity of polyethy- lene (PE) films, and all the modification processes were carried out by employing an atmospheric pressure plasma jet (APPJ) system. (a) PE films were directly modified by APPJ using a gas mixture of He and 02. (b) Acrylic acid (AA) was introduced into the system and a polymer acrylic acid (PAA) coating was deposited onto the PE films. (c) AA was grafted onto the PE surface activated by plasma pre-treatment. It was found that the hydrophilicity of the PE films was significantly improved for all the three methods. However, the samples modified by Process (a) showed hydrophobicity recovery after a storage time of 20 days while no significant change was found in samples modified by Process (b) and Process (c). The Fourier transform infrared spectroscopy (FTIR) results indicated that the most intensive C=O peak was detected on the PE surface modified by Process (c). According to the X-ray photoelectron spectroscopy (XPS) analysis, the ratios of oxygen-containing polar groups for samples modified by Process (b) and Process (c) were higher than that modified by Process (a). 展开更多
关键词 atmospheric pressure plasma jet plasma modification acrylic acid hydrophilicity improvement
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On the green aurora emission of Ar atmospheric pressure plasma 被引量:2
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作者 Fengwu LIU Lanlan NIE Xinpei LU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第5期195-204,共10页
The Ar atmospheric pressure plasma was found to be an excellent laboratorial source for green aurora emission.However,the characteristic and production mechanism of the green aurora emission of the Ar atmospheric pres... The Ar atmospheric pressure plasma was found to be an excellent laboratorial source for green aurora emission.However,the characteristic and production mechanism of the green aurora emission of the Ar atmospheric pressure plasma are still not clear.In this work,an Ar plasma in a long glass tube which emits intense green aurora light is investigated.With the long glass tube,it can be concluded that the green aurora emission in the Ar plasma is not owing to the mixture of Ar plasma plume with the surrounding air.It is also found that the green aurora emission often appeared beyond the active electrode when the active electrode is placed at the downstream of the gas flow.The green emission disappears when the traces amount of O_(2) or N_(2)(about 0.05%–0.07%)is added to Ar.This is because the O_(2) molecules deactivate the upper state O(^(1)S),which results in the decrease of the green emission.On the other hand,when N_(2) is added,Ar metastable atoms are quenched by N_(2),which results in the decrease of O atoms and eventually leads to the decrease of the green emission intensity.The intensity of the green aurora emission increases when the driving voltage frequency increases from 1 to 10 k Hz.More importantly,it is found that the green aurora emission is not affected when a grounded stainless steel needle is in contact with the plasma plume.Thus,the green emission is not driven electrically.All these findings are helpful for the understanding of the physics and its applications of atmospheric pressure plasma jet in space physics,laser physics and other application areas. 展开更多
关键词 atmospheric pressure plasma jet plasma optical emission aurora emission
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