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Science China(Technological Sciences) 2023年第1期66卷 165-172页

作者： LU AnKang LI HanYu YU Yao LIU Lin State Key Lab for Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center and Sechool of Physics Huazhong University of Science and TechnologyWuhan 430074China

Porous metals and metallic nanowires have gained significant attention for their potential applications in catalysis, sensing, and energy storage. Developing a versatile and efficient method for fabricating these functional materials is crucial but remains challenging. Herein, we report a novel and facile electro-dealloying strategy to simultaneously fabricate porous metals and metallic nanowires using atmospheric radio-frequency(RF) capacitively coupled plasmas. The synergistic effect of the heating and plasma sheath’s electric field lead to the nonequilibrium melting of the alloy, resulting continuous ejection of the melted segments to form nanowires and let the unmelted residual parts evolve into a porous structure. This method is applicable to alloys with large melting point differences of their constituent elements, and provides a promising approach to fabricate porous metals and metallic nanowires for a wide range of functional applications.

关键词： atmospheric plasma porous metals metallic nanowires electro-dealloying

Fast processing nylon mesh by surface diffuse atmospheric plasma for large-area oil/water separation

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Nano Research 2023年第7期16卷 9625-9632页

作者： Linfeng Yang Yaping Feng Zengyi He Xinyan Jiang Xianfeng Luo Haoyu Dai Lei Jiang CAS Key Laboratory of Bio-inspired Materials and Interface Sciences Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China

In recent years,numerous studies have been reported for oil/water separation,such as superoleophilic materials for oil absorption and underwater superoleophobic membranes for continuous separation.However,for the recovery of oil slick pollution on near-shore ocean surface caused by various reasons,large area and fast availability of used materials are needed to be considered.Herein,we report an efficient and environmentally friendly method to fast process nylon mesh by surface diffuse atmospheric plasma(SDAP)for large-area oil/water separation.Nylon mesh is funcionalized by atmospheric plasma to generate micro/nano composite structures on the surface,resulting in superhydrophilicity and underwater superoleophobicity within only seconds.The pre-wetted modified nylon mesh can achieve high efficiency(>99.9%)and circulating water flux(~30,000 L·m^(-2)·h^(-1)),with high intrusion pressure(~3 kPa)and universality in oil/water separation.Regular plasma unconditionally generated in the atmosphere with the merit of efficiently functionalizing surface has the potential of large-area materials treatment.This study might take one step further for large-area industrial oily wastewater recovery and even oil slicks collection in near-shore water bodies.

关键词： superwettability oil/water separation surface modification atmospheric plasma

Influence of Ionization Degrees on Conversion of CO and CO_2 in atmospheric plasma near the Ground

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plasma Science and Technology 2014年第8期16卷 782-788页

作者：庞学霞邓泽超贾鹏英梁伟华 College of Physics Science and Technology Hebei UniversityHebei Key Lab of Optic-electronic Information and Materials

A zero-dimensional model is used to study the processes of physical and chemical reactions in atmospheric plasma with different ionization degrees near the ground （0 km）. The temporal evolutions of CO, C02 and other main reactants （namely OH and O2）, which affect the conversion of CO and C02, are obtained for afterglow plasma with different initial values. The results show that the consumption rate of CO is largest when the initiM electron number density neo=1012 cm-3, i.e. the ionization degree is 0.000004%. The number density of CO2 is relatively small when neo=1016 cm-3, i.e. the ionization degree is 0.04%, whereas they are very close under the condition of other ionization degrees. Considering the total number densities of CO and C02 and the consumption rate of CO comprehensively, the best condition is neo=1013 cm-3, i.e. the ionization degree is 0.00004% for reducing the densities of CO and CO2 in the atmospheric plasma. The temporal evolutions of N＋, Ar＋, CO＋ and CO＋ are also shown, and the influences on the temporal evolutions of CO and C02 are analyzed with increasing ionization degree.

关键词： ionization degree carbon dioxide carbon monoxide atmospheric plasma

Formation of carbon and oxygen rich surface layer on high purity magnesium by atmospheric carbon dioxide plasma

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Journal of Magnesium and Alloys 2023年第1期11卷 88-99页

作者： Gyoung G.Jang Sinchul Yeom Jong K.Keum Mina Yoon Harry III Meyer Yi-Feng Su Jiheon Jun Manufacturing Science Division Oak Ridge National Laboratory(ORNL)One Bethel Valley RoadPO Box 2008MS6054Oak RidgeTN 37831United States Material Science and Technologies Division Oak Ridge National Laboratory(ORNL)One Bethel Valley RoadOak RidgeTN 37831United States Neutron Scattering Division&Center for Nanophase Materials Sciences ORNLOne Bethel Valley RoadOak RidgeTN 37831United States Chemical Sciences Division ORNLOne Bethel Valley RoadOak RidgeTN 37831United States

Carbon and oxygen-rich corrosion barrier layer formed on Mg by a simple and scalable CO_(2) atmospheric plasma(CO_(2)-AP)process.The reactive CO_(2)-AP interacts with the Mg surface and forms a unique layered structure with the top MgCO_(3)/MgO-intermixed particulates pillars and the bottom dense layer.The surface features were simultaneously formed on the nano-/micro-structured MgO layer by carbonate molecules,plasma-active CO_(2) molecules,and/or other volatile organic compounds on the nano-/micro-structured MgO particle layer.The resulting surfaces after CO_(2)-AP were either hydrophobic or hydrophilic and exhibited lower anodic current or high resistance for Mg corrosion.For the hydrophobic surfaces of CO_(2)-AP treated Mg,molecular dynamic simulations were performed to understand the origin of hydrophobicity and identified that the amorphous carbon layers formed on the Mg surface are the source.The environmentally benign abundant-gas-based process enables the cost reduction associated with waste treatment,generation of by-product,and supply of raw material.

关键词： atmospheric plasma Magnesium Corrosion protection Surface modification

Influence of Ionization Degrees on the Evolutions of Charged Particles in atmospheric plasma at Low Altitude

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plasma Science and Technology 2012年第8期14卷 716-722页

作者：庞学霞邓泽超贾鹏英梁伟华李霞 College of Physics Science and Technology Hebei University Tangshan Labor Technician College

A zero-dimensional model which includes 56 species of reactants and 427 reactions is used to study the behavior of charged particles in atmospheric plasmas with different ionization degrees at low altitude （near 0 km）. The constant coefficient nonlinear equations are solved by using the Quasi-steady-state approximation method. The electron lifetimes are obtained for afterglow plasma with different initial values, and the temporal evolutions of the main charged species are presented, which are dominant in reaction processes. The results show that the electron number density decays quickly. The lifetimes of electrons are shortened by about two orders with increasing ionization degree. Electrons then attach to neutral particles and produce negative ions. When the initial electron densities are in the range of 10l~ ~ 1014 cm-3, the negative ions have sufficiently high densities and long lifetimes for air purification, disinfection and sterilization. Electrons, O（2,-）, O（4,-） CO（4,-） and CO（3,-） are the dominant negative species when the initial electron density neo ≤ 1013 cm^（-3）, and only electrons and CO3 are left when neo 〉 1015 cm^（-3）. N（＋,2）, N＋ and O（＋,2） are dominant in the positive charges for any ionization degree. Other positive species, such as 0（＋,4）, N（＋,3）, NO（＋,2）, NO（＋,2）, Ar（＋,2） and H3O＋. H2O, are dominant only for a certain ionization degree and in a certain period.

关键词： ionization degree electron lifetime atmospheric plasma numerical simulation

Surface Treatment of PET Nonwovens with atmospheric plasma

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plasma Science and Technology 2013年第1期15卷 82-85页

作者：李淑芳 Department of Textile and Chemical Engineering of Changzhou Textile Garment Institute Changzhou New Textile Materials Laboratory

In this study, polyethylene-terephthalate （PET） nonwovens are treated using an atmospheric plasma and the effects of the treatment time, treatment power and discharge distance on the ability of water-penetration into the nonwovens are investigated. The result indicates that the method can improve the wettability of PET nonwovens remarkably, but the aging decay of the sample＇s wettability is found to be notable as a function of the storage time after treatment due to the internal rotation of the single bond of surface macromolecules. As shown by SEM and XPS analysis, the etching and surface reaction are significant, and water-penetration weight is found to increase remarkably with the increasing power. This variation can be attributed to momentum transfer and enhanced higher-energy particle excitation.

关键词： PET nonwovens atmospheric plasma treated time treated power dischargedistance aging decay

The Oblique Incident Effects of Electromagnetic Wave in atmospheric Pressure plasma Layers

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plasma Science and Technology 2008年第2期10卷 180-184页

作者：何勇江中和胡希伟刘明海 College of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

The propagating behaviours, i.e. phase shift, transmissivity, reflectivity and absorp- tivity, of an electromagnetic （EM） wave in a two-dimensional atmospheric pressure plasma layer are described by the numerical solutions of integral-differential Maxwell＇s equations through a generalized finite-difference-time-domain （FDTD） algorithm. These propagating behaviours are found to be strongly affected by five factors： two EM wave characteristics relevant to the oblique incident and three dimensionless factors. The two EM wave factors are the polarization mode （TM mode or TE mode） and its incident angle. The three dimensionless factors are： the ratio of the maximum electron density to the critical density no/nor, the ratio of the plasma layer width to the wave length d/λ, and the ratio of the collision frequency between electrons and neutrals to the incident wave frequency veo/f.

关键词： electromagnetic wave atmospheric plasma propagation

Propagation of Electromagnetic TM (S-Polarization) Mode in Two-Dimensional atmospheric plasma

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plasma Science and Technology 2006年第3期8卷 297-299页

作者：江中和胡希伟刘明海张姝何勇潘垣 College of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

The finite-difference-time-domain （FDTD） method is applied to simulate the twodimensional propagation of electromagnetic TM （S-polarization） mode in atmospheric plasma and in metal layer for strong electron-neutral collisions. Dependence of the wave attenuation on both plasma parameters and incident wave angle are obtained. It is indicated that for a given electron density profile the attenuation depends strongly on the incident angle, the wave frequency, the width of plasma layer, and the collision frequency between electrons and neutrals.

关键词： FDTD TM mode atmospheric plasma

Strategies for Scalable Gas-Phase Preparation of Free-Standing Graphene

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CCS Chemistry 2021年第4期3卷 1058-1077页

作者： Yangyong Sun Jin Zhang Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871 Beijing Graphene Institute Beijing 100095

The preparation of graphene with high quality serves as a prerequisite for its usage.Traditional methods of graphene production,represented by liquid-phase exfoliation and chemical vapor deposition,either sacrifice the quality and purity of graphene or are limited by the substrate and catalyst.Developing simple and scalable preparation methods of high-quality and high-purity graphene remains a big challenge.Herein,we have reviewed the gas-phase methods including carbonization,combustion,arc discharge,and atmospheric plasma for scalable preparation of free-standing graphene,which are catalyst-,substrate-,solvent-free,and without the need for complex post-treatment methods.The obtained graphene exhibits characteristics of high quality and high purity.Moreover,applications of free-standing graphene were also summarized.Finally,perspectives on opportunities and challenges of free-standing graphene have been discussed.

关键词： scalable production gas-phase growth free-standing graphene high-quality graphene atmospheric plasma

A Novel Continuously Initiated Polymerization by One-Atmosphere Low Temperature plasma Device

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plasma Science and Technology 2005年第2期7卷 2758-2760页

作者：尤庆亮孟月东汪建华区琼荣徐旭钟少峰 Institute of plasma Physics Chinese Academy of Sciences Hefei 230031China Wuhan Institute of Technology Wuhan 430073 China

A novel atmospheric plasma device developed in this paper, which is more effective and convenient to study the plasma-initiated polymerization (PIP) than conventional setup. The structure and mechanism of the device is introduced. Some plasma-initiated polymerization experiments are carried out on the device, and the conversion of AA (Acrylic acid) and AM (Acryl amide) atmospheric (N2) plasma polymerization are respectively 89% and 94% after 120 h post polymerization, whereby IR spectra of the product (AA, AM). Our PIP result are confirmed.

关键词： plasma initiated polymerization acrylic acid acryl amide atmospheric plasma