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Ionization process and distinctive characteristic of atmospheric pressure cold plasma jet driven resonantly by microwave pulses

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Plasma Science and Technology 2022年第10期24卷 45-53页

作者： Lingli HONG Zhaoquan CHEN Jie YANG Tao CHENG Sile CHEN Yuming ZHOU Bing WANG xinpei lu Anhui Province Key Laboratory of Power Electronics and Electrical Control Anhui University of TechnologyMaanshan 243032People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China

In the present study,a coaxial transmission line resonator is constructed,which is always capable of generating cold microwave plasma jet plumes in ambient air in spite of using argon,nitrogen,or even air,*** the different kinds of working gas induce the different discharge performance,their ionization processes all indicate that the ionization enhancement has taken place twice in each pulsed periods,and the electron densities measured by the method of microwave Rayleigh scattering are higher than the amplitude order of 10^(18)m^(-3).The tail region of plasma jets all contain a large number of active particles,like NO,O,emitted photons,etc,but without O_(3).The formation mechanism and the distinctive characteristics are attributed to the resonance excitation of the locally enhanced electric fields,the ionization wave propulsion,and the temporal and spatial distribution of different particles in the pulsed microwave plasma *** parameters of plasma jet could be modulated by adjusting microwave power,modulation pulse parameters(modulation frequency and duty ratio),gas type and its flow rate,according to the requirements of application scenarios.

关键词： pulsed microwave discharge cold plasma jet transient ionization process ionization enhancement

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

A homogeneous atmospheric pressure air plasma in a 10 mm gap based on a three-electrode configuration

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Plasma Science and Technology 2023年第10期25卷 75-80页

作者：李志宇刘大伟卢新培聂兰兰 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

Generation of atmospheric pressure homogeneous air plasma in a large gap(>4 mm)is a *** this study,an atmospheric pressure homogeneous air plasma generated in a gap up to 10 mm is reported,which is based on a three-electrode configuration,where a high-voltage(HV)electrode and a middle electrode form a surface dielectric barrier discharge(S-DBD),and together with the ground electrode form the main volume ***-speed photographs confirm that the discharge in the main gap is *** gas temperature of the plasma estimated from the N_(2)(C^(3)∏_(u)-B^(3)∏_(g))(Δv=-2)emission is about 320 K,which is close to room temperature.A detailed analysis shows that the discharge ignited between the HV electrode and the middle electrode is serving as an electron source,and the electrons deposited on the dielectric plate are due to the S-DBD along with the applied voltage generating a driving force,which results in a high concentration of seed electrons in the main gap and induces the homogeneous *** analysis shows that the electric field in the main gap is only about18.45 k V·cm^(-1),which is much lower than the typical breakdown electric field of 30 k V·cm^(-1)for atmospheric pressure air discharge.

关键词： atmospheric pressure plasma homogeneous discharge glow discharge air plasma

Temporal electric field of a helium plasma jet by electric field induced second harmonic(E-FISH)method

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Plasma Science and Technology 2023年第1期25卷 43-52页

作者：李旭晋绍珲宋珂聂兰兰刘大伟卢新培 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 Center of Stomatology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030People's Republic of China School of Stomatology Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030People's Republic of China

Electric field is an important parameter of plasma,which is related to electron temperature,electron density,excited species density,and so *** this work,the electric field of an atmospheric pressure plasma jet is diagnosed by the electric field induced second harmonic(E-FISH)method,and the time-resolved electric field under different conditions is *** positive pulse voltage is applied,the electric field has a peak of about 25 kV cm-1at the rising edge of the voltage pulse.A dark channel is left behind the plasma bullet and the electric field in the dark channel is about 5 kV *** the other hand,when negative pulse voltage is applied,the electric field has a peak of-16 kV cm-1when the negative voltage is increased to-8 kV.A relatively bright channel is left behind the plasma head and the electric field in this relatively bright channel is about-6 kV *** the pulse rising time increases from 60 to 200 ns,the peak electric field at both the rising edge and the falling edge of the voltage decreases *** 0.5%of oxygen is added to the main working gas helium,the peak electric field at the rising edge is only about 15 kV *** the other hand,when 0.5%nitrogen is added,the peak electric field increases especially at the falling edge of the voltage pulse,where it increases reversely from-12 to-16 kV cm-1(the minus sign only represents the direction of electric field).

关键词： atmospheric pressure plasma jet electric field electric field induced second harmonic

Plasma-activated hydrogel:fabrication,functionalization,and effective biological model

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Plasma Science and Technology 2023年第9期25卷 1-9页

作者：李嘉诚兰存涛聂兰兰刘大伟卢新培 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 Wuhan National High Magnetic Field Center Wuhan 430074People’s Republic of China

Hydrogels are biomaterials with 3D networks of hydrophilic *** generation of hydrogels is turning to the development of hydrogels with the help of enabling *** can tailor the hydrogels’properties through simultaneous physical and chemical actions,resulting in an emerging technology of plasma-activated hydrogels(PAH).PAH can be divided into functional PAH and biological tissue model *** review systematically introduces the plasma sources,plasma etching polymer surface,and plasma cross-linking involved in the fabrication of ***‘diffusion-drift-reaction model’is used to study the microscopic physicochemical interaction between plasma and biological tissue PAH ***,the main achievements of PAH,including wound treatment,sterilization,3D tumor model,etc,and their development trends are discussed.

关键词： plasma-activated hydrogel plasma crosslinking biological model

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大气压非平衡等离子体诊断：激光散射

高电压技术 2021年第10期47卷 3684-3695页

作者：卢新培吴帆谭笑华中科技大学电气与电子工程学院国网江苏省电力有限公司电力科学研究院

大气压非平衡等离子体在表面改性和杀菌消毒等领域等具有广泛的应用。为了增强对其物理机制的理解,电子数密度和温度、气体动力学温度和分子转动温度等关键参数的测量必不可少。激光散射是对这些参数进行诊断的常用技术,该文将针对大气... 详细信息

大气压非平衡等离子体在表面改性和杀菌消毒等领域等具有广泛的应用。为了增强对其物理机制的理解,电子数密度和温度、气体动力学温度和分子转动温度等关键参数的测量必不可少。激光散射是对这些参数进行诊断的常用技术,该文将针对大气压非平衡等离子体诊断中的激光散射诊断进行了较为详细的评述。首先对瑞利散射、汤姆逊散射和拉曼散射这3种类型的激光散射进行了基本的介绍,推导了相应的计算式。随之总结归类了目前已报道过的3种的散射诊断策略,分别为:三光栅光谱仪、布拉格光栅滤波器和物理掩膜结合单光谱仪结构,并对这3种诊断策略的优缺点进行了归纳。分析讨论了近些年散射诊断应用在大气压非平衡等离子体中的研究成果,讨论了激光散射的研究方向。基于此凝练了激光散射在大气压非平衡等离子体中实现成功诊断的核心技术问题,这对拓展激光散射在等离子体诊断中的应用范围具有一定的指导意义。

关键词：大气压非平衡等离子体气体放电等离子体诊断激光散射光谱电子数密度

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大气压非平衡等离子体射流

高电压技术 2015年第8期41卷 2602-2624页

作者：吴淑群聂兰兰卢新培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 南京航空航天大学自动化学院南京210016

大气压非平衡等离子体射流(APNP-Js)的显著优点是可以在开放空间内而非狭窄放电间隙内(如介质阻挡放电)产生非平衡等离子体,APNP-Js已成为低温等离子体应用领域的1项新型关键技术。为此,首先从驱动电源的角度出发,分别介绍了直流、交流... 详细信息

大气压非平衡等离子体射流(APNP-Js)的显著优点是可以在开放空间内而非狭窄放电间隙内(如介质阻挡放电)产生非平衡等离子体,APNP-Js已成为低温等离子体应用领域的1项新型关键技术。为此,首先从驱动电源的角度出发,分别介绍了直流、交流、射频、微波、脉冲和双电源驱动的几种典型APNP-Js。其次比较了不同电源驱动的APNP-Js特性,发现在消耗功率相同的情况下,脉冲驱动模式下的APNP-Js长度更长,APNP-Js推进速度更快,活性粒子数密度更高,而气体温度则保持在常温。再次进一步分析了电源参数对APNP-Js的影响,1随着频率从1 Hz上升至射频范围,APNP-Js长度总体变短,APNP-Js推进形状由"等离子体子弹"转变为连续柱状;2随着脉冲上升沿从几μs降低至50 ns,不仅APNP-Js推进速度加快,而且APNP-Js长度增加,电子温度更高,活性更强;3通过比较正负极性电压驱动的APNP-Js特性,发现负极性APNP-Js长度更短,APNP-Js推进速度更慢,射流携带电流更小,但等离子体通道中电场强度更高。最后讨论了驱动电源特性与APNP-Js参数之间的关系,并对APNP-Js面临的一些关键问题和发展方向进行了展望,如利用最少的电源功率来驱动APNP-Js以获得最高的活性粒子数密度、电源输出能量耦合进等离子体后如何分配优化等。

关键词：大气压非平衡等离子体等离子体射流脉冲放电活性粒子等离子体医学驱动电源气体放电

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大气压非平衡等离子体诊断：激光诱导荧光

高电压技术 2021年第5期47卷 1831-1846页

作者：卢新培吴帆李嘉胤华中科技大学电气与电子工程学院

大气压非平衡等离子体由于在生物医学、环境治理、材料加工等领域具有广泛应用价值,近来受到了极大的关注。而等离子体中各种活性粒子在这些应用中往往扮演着重要的角色,因此对各种活性粒子浓度的诊断是推进其应用的关键。文中针对大气... 详细信息

大气压非平衡等离子体由于在生物医学、环境治理、材料加工等领域具有广泛应用价值,近来受到了极大的关注。而等离子体中各种活性粒子在这些应用中往往扮演着重要的角色,因此对各种活性粒子浓度的诊断是推进其应用的关键。文中针对大气压非平衡等离子体诊断中的一种重要的诊断方法,即激光诱导荧光方法进行了较为详细的评述。首先对激光诱导荧光的基本原理、实验装置进行了系统的介绍。并给出了单光子和双光子激发的绝对密度标定方法和实验案例。针对常见的OH、NO、O、N等活性粒子,分析讨论了不同等离子体源条件下的分布特性。最后根据激光诱导荧光技术的特点和研究现状,分析讨论了未来的研究方向。

关键词：大气压非平衡等离子体气体放电等离子体诊断激光诱导荧光活性粒子

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磁场固定串联辉光等离子体固氮特性研究

北京大学学报（自然科学版） 2023年第6期59卷 915-922页

作者：彭科刘玥汐陈良卢新培中电科奥义健康科技有限公司北京100043 华中科技大学电气与电子工程学院武汉430074

提出一种由两个等离子体发生装置串联组成的新型磁场固定串联辉光等离子体固氮装置。对该装置的固氮能耗、产物浓度、电压特性、电阻特性、电导率特性以及电场特性进行分析,并与单个装置放电情况进行对比。结果显示,串联放电装置的等离... 详细信息

提出一种由两个等离子体发生装置串联组成的新型磁场固定串联辉光等离子体固氮装置。对该装置的固氮能耗、产物浓度、电压特性、电阻特性、电导率特性以及电场特性进行分析,并与单个装置放电情况进行对比。结果显示,串联放电装置的等离子体固氮能耗在放电电流为60mA时达到最低,为143.14GJ/tN,考虑到镇流电阻消耗的电能后,总固氮能耗最低为229.69 GJ/tN。单个装置放电时的总固氮能耗最低为370.38GJ/tN,表明串联放电有利于降低固氮能耗,且随电流增加,两者固氮能耗的差距显著加大。

关键词：固氮辉光放电低温等离子体串联电路

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