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Effect of gas components on the postdischarge temporal behavior of OH and O of a non-equilibrium atmospheric pressure plasma driven by nanosecond voltage pulses

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Plasma Science and Technology 2024年第5期26卷 72-81页

作者：王兰萍聂兰兰卢新培 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

OH radicals and O atoms are two of the most important reactive species of non-equilibrium atmospheric pressure plasma(NAPP),which plays an important role in applications such as plasma ***,experimental studies on how the gas content affects the postdischarge temporal evolutions of OH and O in the noble gas ns-NAPP are very *** this work,the effect of the percentages of O_(2),N_(2),and H_(2)O on the amounts of OH and O productions and their post-discharge temporal behaviors in ns-NAPP is investigated by laser-induced fluorescence(LIF)*** results show that the productions of OH and O increase and then decrease with the increase of O_(2)*** OH and O densities reach their maximum when about 0.8%O_(2)is *** increase of the O_(2)concentration results in a decrease of the initial densities of both OH and O,and leads to their faster *** increase of N_(2)percentage also results in the increase and then decrease of the OH and O densities,but the change is ***,when the H_(2)O concentration is increased from 100 to 3000 ppm,the initial OH density increases slightly,but the OH density decays much faster,while the initial density of O decreases with the increase of the H_(2)O *** analysis,it is found that OH and O are mainly produced through electron collisional dissociation.O(^(1)D)is critical for OH generation.O_(3)accelerates the consumption processes of OH and O at high O_(2)*** addition of H_(2)O in the NAPP considerably enhances the electronegativity,while it decreases the overall plasma reactivity,accelerates the decay of OH,and reduces the O atom density.

关键词： O atom OH radical post-discharge temporal behavior laser-induced fluorescence

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The state-of-the-art of atmospheric pressure plasma for transdermal drug delivery

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Plasma Science and Technology 2024年第4期26卷 9-26页

作者：聂兰兰刘大伟程鹤赵峰卢新培 State key laboratory of advanced electromagnetic engineering and technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094People’s Republic of China Department of Thoracic Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022People’s Republic of China

Plasma-enhanced transdermal drug delivery(TDD) presents advantages over traditional methods,including painless application, minimal skin damage, and rapid recovery of permeability. To harness its clinical potential, factors related to plasma’s unique properties, such as reactive species and electric fields, must be carefully *** review provides a concise summary of conventional TDD methods and subsequently offers a comprehensive examination of the current state-of-the-art in plasma-enhanced TDD. This includes an analysis of the impact of plasma on HaCaT human keratinocyte cells, ex vivo/in vivo studies, and clinical research on plasma-assisted TDD. Moreover, the review explores the effects of plasma on skin physical characteristics such as microhole formation, transepidermal water loss(TEWL), molecular structure of the stratum corneum(SC), and skin resistance. Additionally, it discusses the involvement of various reactive agents in plasma-enhanced TDD, encompassing electric fields,charged particles, UV/VUV radiation, heat, and reactive species. Lastly, the review briefly addresses the temporal behavior of the skin after plasma treatment, safety considerations, and potential risks associated with plasma-enhanced TDD.

关键词： plasma transdermal drug delivery skin physical characteristics reactive agents

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Experimental study on the influence of H_(2)O vapor and O_(2)for desulfurization and denitrification of the diesel exhaust in marine application by non‐thermal plasma

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High Voltage 2021年第6期6卷 1092-1103页

作者： Yunkai Cai Lin Lv xinpei lu School of Energy and Power Engineering Wuhan University of TechnologyWuhanHubeiPeople's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanHubeiPeople's Republic of China

To improve the pollutant removal efficiency by non‐thermal plasma(NTP),the effect of H2O vapor and O_(2)on removal efficiency of NO and SO_(2)as well as the reduction of CO was investigated in H_(2)O/O_(2)/SO_(2)/NO/C_(3)H_(6)/CO_(2)/N_(2)*** analyse the reaction mechanism,the effects of H2O vapor and O2 on the emission intensity of Oð3p^(5)P→3s^(5)S0_(2)Þand OHðA^(2)Σþ→X^(2)ΠÞwere *** experimental results show that the increase of H_(2)O vapour(0%-9.8%)promotes the generation of OH radicals,increases the removal efficiency of NO from 18.9%to 57.3%,decreases the energy per NO removed from 449.0 to 148.1 eV/NO,increases SO_(2)removal efficiency from 4.8%to 35.3%,decreases the energy per SO_(2)removed decreases from 2784.0 to 582.9 eV/SO_(2),and reduces the generation of CO from 460 to 229 *** the range of 0%-15%,the increase of O_(2)content promotes the formation of O radicals,increases the removal efficiency of NO from 8.5%to 54.2%,and decreases the energy per NO removed from 994.3 to 156.4 eV/*** the range of 0%-5%,increasing O_(2)content promotes SO_(2)removal efficiency from 8.7%to 24.8%,and decreases the energy per SO_(2)removed from 2485.7 to 876.6 eV/SO_(2).However,CO generation increases from 200 to 350 ppm with the increase of O_(2)in 0%-5%due to the incomplete oxidation of C_(3)H_(6).In the range of 5%-15%,the increase of O2 produces more O radicals,decreases the removal efficiency of SO_(2)from 24.8%to 23.5%and the generates of CO from 350 to 311 *** study is helpful for improving the efficiency of NTP for desulfurization and denitrification,while reducing the by‐product CO.

关键词： removed thermal vapour

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On the green aurora emission of Ar atmospheric pressure plasma

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Plasma Science and Technology 2022年第5期24卷 195-204页

作者： Fengwu LIU Lanlan NIE xinpei lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

The Ar atmospheric pressure plasma was found to be an excellent laboratorial source for green aurora ***,the characteristic and production mechanism of the green aurora emission of the Ar atmospheric pressure plasma are still not *** this work,an Ar plasma in a long glass tube which emits intense green aurora light is *** 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 *** 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 *** green emission disappears when the traces amount of O_(2) or N_(2)(about 0.05%–0.07%)is added to *** is because the O_(2) molecules deactivate the upper state O(^(1)S),which results in the decrease of the green *** 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 of the green aurora emission increases when the driving voltage frequency increases from 1 to 10 k *** importantly,it is found that the green aurora emission is not affected when a grounded stainless steel needle is in contact with the plasma ***,the green emission is not driven *** 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.

关键词： atmospheric pressure plasma jet plasma optical emission aurora emission

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Numerical study on propagation mechanism and bio-medicine applications of plasma jet

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High Voltage 2016年第2期1卷 62-73页

作者： He Cheng Xin Liu xinpei lu Dawei Liu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuHanHuBeiPeople’s Republic of China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’anPeople’s Republic of China

In this study,the propagation mechanism of plasma jet and some bio-medical applications are investigated by two-dimensional numerical *** key equations of plasma physics and chemistry related with plasma jet are firstly *** simulation results suggest that the sheath forms near the dielectric tube inner surface,which results in the plasma channel to shrink in the radial direction inside the dielectric *** photoionisation of air species plays a crucial role in the transition from the localised discharge to *** Penning ionisation increases the electric conductivity of the plasma channel and facilitates the formation of ring-shaped plasma *** the plasma jet in the open air,electronimpact dissociation of H2O,electron neutralisation of H2O+,as well as dissociation of H2O by O(1D)are found to be the main reactions to produce *** micro plasma jet,the higher ignition voltage as the tube diameter decreased is attributed to the deceasing pre-avalanche electron density inside the *** simulation of plasma treatment of bacteria biofilm indicates that the mean free path of charged species inμm scale permitted the plasma penetrate into the cavity of the biofilm,and the structure of the biofilm results in the non-uniform distribution of ROS and *** simulation of plasma treatment of cells immersed in liquid suggests that the HO2 generated by plasma aqueous species is the only way for superoxide to penetrate cell membrane and damage cytosolic fumarase B.

关键词： propagation mechanism dielectric

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Ionization waves in nanosecond pulsed atmospheric pressure plasma jets in argon

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High Voltage 2021年第4期6卷 665-673页

作者： Bangdou Huang Cheng Zhang Wenchao Zhu xinpei lu Tao Shao Beijing International S&T Cooperation Base for Plasma Science and Energy Conversion Institute of Electrical EngineeringChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina State Key Laboratory of NBC Protection for Civilian BeijingPeople’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanHubeiChina

Typical ionization waves(IWs)are observed during the propagation of nanosecond pulsed atmospheric pressure plasma jets(APPJs)with argon flow,combining both the measurement of the axial electric field(Ez)and the temporal resolved optical *** movement of the luminous APPJ head is recognized as the development of the IW front,accompanied with the propagation of the peak electric ***,the radial distribution of Ez transits from a central peak profile before the IW front arrives to a hollow profile after the pass of the IW *** for the temporal Ez trend,there is a mode transition from the single-peak feature under a low peak voltage to the double-peak feature under a higher peak voltage,indicating the existence of both primary and secondary *** effect of target conditions on the IWs in APPJs is also *** a metal target,no residual electric field is observed before imposing the high-voltage ***,with a dielectric target,the residual surface charges generate a back-ground electric field in the opposite direction to that during IW *** the free APPJ(with no target),on the voltage falling edge,a negative electric field drives the electron flow to compensate the positive ions left over during the forward IW propa-gation on the voltage rising edge.

关键词： field luminous dielectric

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On the charged aerosols generated by atmospheric pressure non‐equilibrium plasma

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High Voltage 2021年第3期6卷 408-425页

作者： Yanzhe Zhang He Cheng Haotian Gao Dawei Liu xinpei lu State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuHanHuBeiChina

Recently,charged aerosols are used widely in many applications,such as fog elimination,inactivation of airborne viruses and so *** pressure non‐equilibrium plasma(APNP)have become an efficient way to generate charged *** the traditional pin‐plate or wire‐plate APNP sources,the new APNP sources such as large scale corona discharge system and air plasma jet array are *** sources can increase the ion density in open air and generate adjustable large plasma plume,which are helpful in increasing the charging efficiency on *** the interactions between plasma and aerosols is quite complicated,the preliminary study suggests that the diffusion charging dominates aerosols below 0.1μm,field charging dominates aerosols larger than 1μm,and the photo charging also contributes to aerosols *** reactive charged aerosols have shown their potential in the artificial rain enhancement,biomedicine,and ma-terial ***,challenges and opportunities for theoretical,experimental,and application research in related cross‐disciplinary areas are presented to stimulate critical discussions and collaborations in the future.

关键词： equilibrium charging discussions

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A non‐equal gap distance dielectric barrier discharge:Between cone‐shape and cylinder‐shape electrodes

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High Voltage 2022年第1期7卷 98-105页

作者： Shaohui Jin Zhiyu Li Yubin Xian Lanlan Nie xinpei lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanHubeiChina

A non‐equal gap distance dielectric barrier discharge(DBD)between cone‐shape and a cylinder‐shaped electrodes is *** DBD is driven by a nanosecond voltage *** the pulse frequency is 500 Hz or lower,ladder‐shape plasma with multiple plasma layers is generated within the gap,with a distance increasing from 1 to 7 *** to high‐speed photographs of the plasma captured by an intensified charge‐coupled camera detector camera,the ladder‐shaped plasma is formed owing to propa-gation of ring‐shaped plasma from the region of the short‐gap distance to the region of long‐gap distance with regular variations in its propagation *** propagation speed drops to zero and lasts for about 20-30 ns at the region of each plasma layer,which results in bright plasma *** electric field of the plasma layer at the region of the different gap distance is evaluated according to the optical emission intensity ratio R_(391)/_(394)of N_(2)^(+)at 391 nm and N_(2) at 394 *** obtained electric field drops from 8.1 to 6.4 kV/mm when the plasma is propagated from regions of gap distance of 2-5 *** the pulse frequency is increased to 1 kHz or higher,the discharge changes into a filamentary mode and the multiple‐layer plasma disappears.

关键词： cylinder shaped dielectric

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Plasma-activated ethanol solution and it's decontamination effect

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High Voltage 2023年第4期8卷 833-840页

作者： YiQian Li JiaLin Liu Feng Zhao Ke Song LanLan Nie DaWei Liu xinpei lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanHubeiChina Department of Thoracic Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Center of Stomatology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina

Ethanol solution as a disinfectant has been widely used in various ***,it has a significant bactericidal capability only when the volume fraction of ethanol is around 70%-75%.For such high concentration of ethanol solution,it has an irritating *** it is used for applications such as wound disinfection,it causes a stinging *** concentrations of ethanol solution are less irritating,but it is also less effective at killing *** this study,an idea for producing a green,efficient and less irritating disinfectant is *** is based on a plasma-activated low-concentration ethanol solution(PAES).It is found that the plasma-activated 10% volume fraction of ethanol solution can kill more than seven orders of magnitude of Escherichia coli,while the untreated 10% volume fraction of ethanol solution has no bactericidal ***,the PAES's activity remains unchanged after being stored at -20℃ for three *** investigation shows that new compositions including peracetic acid,peroxynitrite,hydrogen peroxide and acetic acid are detected in the PAES,which together are playing the main role of the excellent and prolonged bactericidal effect.

关键词： effect. ethanol unchanged

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大气压脉冲微波Ar/N_(2)等离子体射流的时空特性研究

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中国科学：物理学、力学、天文学 2024年第3期54卷 158-171页

作者：陈兆权王伟业陈思乐王超徐笑娟王兵周郁明卢新培安徽工业大学安徽省高校电力电子与运动控制重点实验室马鞍山243032 华中科技大学强电磁工程与新技术国家重点实验室武汉430074

在空气环境中,很难形成特定形貌的微波等离子体射流.本文构建了双气体通道同轴谐振放电装置,在空气环境中产生了脉冲微波Ar/N_(2)双层等离子体射流.实验测量了Ar/N_(2)等离子体射流电离发展的时空演变过程:(1)使用高速相机测量等离子体... 详细信息

在空气环境中,很难形成特定形貌的微波等离子体射流.本文构建了双气体通道同轴谐振放电装置,在空气环境中产生了脉冲微波Ar/N_(2)双层等离子体射流.实验测量了Ar/N_(2)等离子体射流电离发展的时空演变过程:(1)使用高速相机测量等离子体射流形貌的瞬态变化,发现电离的初始阶段和结束阶段存在光辐射增强的放电影像;(2)使用瑞利散射装置测量等离子体射流的电子密度,发现电子密度值达到10^(21)m^(-3)数量级,且在脉冲微波的上升沿和下降沿各有一次电离波峰;(3)使用单色仪测量特定波长段光谱的瞬态变化,追踪N_(2)^(+)谱线从首次出现到稳定发展、直至最后衰减消失的过程.结合实验测量结果和电磁仿真分析,发现脉冲微波的上升沿和下降沿各有一次增强电离过程,揭示了脉冲微波Ar/N_(2)双层等离子体射流的特殊放电形貌是时空局域增强电离致使.

关键词：微波放电电离机理等离子体射流电磁模拟

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