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Insight into the remaining high surface energy of atmospheric DBD plasma-treated polyethylene web after three months' aging

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Plasma Science and Technology 2019年第1期21卷 79-86页

作者： Hua LI zhengduo wang Lizhen YANG Qiang CHEN Laboratory of Plasma Physics & Materials Beijing Institute of Graphic Communication

In this paper, we report the modification of polyethylene(45 μm in thickness) webs through a roll-to-roll dielectric barrier discharge plasma treatment in an open atmospheric *** work differs from the normal adopted corona discharge treatment at an atmospheric pressure, in that three monomers: allylamine, acrylic acid, and ethanol, are inlet into the discharge zone by argon(Ar) carrier gas. As a comparison, Ar plasma treatment is also carried out. We focus on the aging properties of treated plastics in the open air. It is found that the modified webs can retain the surface energy as high as 50.0?±?1 mN m^(-1) for more than three months. After characterization of the as-prepared and aged samples by the surface roughness, the wettability, and the chemical structure, the mechanism of retaining high surface energy is then presumed. We think that the initial high surface energy just after plasma treatment is correlated to the grafted functional groups, while the over 50.0 mN m^(-1) remaining surface energy after three month aging is due to the stable concentrations of oxygen-contained and nitrogencontained groups by post-reaction on the surfaces.

关键词： aging atmospheric DBD treatment polyethylene surface energy remaining

Application of Plasma Enhanced Chemical Vapor Deposition for Fingerprint Resistance

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稀有金属材料与工程 2012年第S1期41卷 433-438页

作者： Lei Wenwen Chen Qiang Qi Fengyang Yang Lizhen Liu Zhongwei wang zhengduo Beijing Inst Graph Commun Lab Plasma Phys & Mat Beijing 102600 Peoples R China

SiOx and diamond-like carbon(DLC)coatings as the fingerprint resistance and corrosion resistance layers were deposited by capacitively coupled plasma(CCP)-enhanced chemical vapor deposition powered by radio frequency(RF-PECVD).In here hexamethyldisiloxane(HMDSO)as monomer for SiOx coating,C2H2 as the carbon source for DLC growth precursor,and Ar as the dilution gas were *** important factors affected fingerprint resistance was explored in ***,the corrosion resistant test on coatings and substrates were then examined by the potentiodynamic polarization measurement and salt-spray corrosion test,*** chemical structure and composition of SiOx and DLC films were analyzed by FTIR,and the relationship between them and anti-corrosion property was *** results show that the DLC coating demonstrates a better anti-fingerprint behavior than that of coated SiOx,especially in acidic solution environment.

关键词： SiOx and DLC coatings CCP fingerprint resistance corrosion resistance

Characterization of W Coating on Cu Substrate Prepared by Double-Glow Discharge

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Plasma Science and Technology 2012年第1期14卷 71-74页

作者： ZHANG Fubin wang zhengduo CHEN Qiang CAI Huiping Laboratory of Plasma Physics and Material Beijing Institute of Graphic CommunicationBeijing 102600China

In this study, tungsten （W） was coated on a copper （Cu） substrate by using doubleglow discharge technique using a pure W panel as the target and argon （Ar） as the discharge and sputtering gas. The crystal structure of the W coating was examined by X-ray diffraction （XRD）. Scanning electron microscopy （SEM） was performed with cross-section images to investigate the penetration depth of W into the Cu body. Additionally, the properties of wearability resistance, corrosion resistance and mechanical strength of the W coated Cu matrix were also measured. It is concluded that in double-glow plasma, W coated Cu can be facilely prepared. It is noticed that the treatment temperature heavily dominates the properties of the W-Cu composite.

关键词： double-glow discharge W-Cu characterizations

Recent progress on non-thermal plasma technology for high barrier layer fabrication

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Plasma Science and Technology 2018年第6期20卷 1-16页

作者： Haibao ZHANG Lijun SANG zhengduo wang Zhongwei LlU Lizhen YANG Qiang CHEN Laboratory of Plasma Physics and Materials Beijing Institute of Graphic CommunicationBeijing 102600People＇s Republic of China

This review describes the application of non-thermal plasma（NTP） technology for high barrier layer fabrication in packaging *** technology is considered to be the most prospective approaches for the barrier layer fabrication over the past decades due to unpollution,high speed,*** applications of NTP technology have achieved numerous exciting results in high barrier packaging *** it seemly demands a detailed review to summarize the past works and direct the future *** review focuses on the different NTP resources applied in the high barrier area,the role of plasma surface modification on packaging film surface properties,and the deposition of different barrier coatings based on NTP *** particular,this review emphasizes the cutting-edge technologies of NTP on interlayer deposition with organic,inorganic for multilayer barriers *** future prospects of NTP technology in high barrier film areas are also described.

关键词： non-thermal plasma(NTP) polymer permeability barrier layer surface modification

Fabrication and characterization of iron and iron carbide thin films by plasma enhanced pulsed chemical vapor deposition

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Plasma Science and Technology 2019年第10期21卷 54-60页

作者： Yulian HU Xu TIAN Qipeng FAN zhengduo wang Bowen LIU Lizhen YANG Zhongwei LIU Laboratory of Plasma Physics and Materials Beijing Institute of Graphic Communication

A new pulsed chemical vapor deposition（PCVD） process has been developed to fabricate iron（Fe） and iron carbide(Fe1-xCx) thin films at low temperature range from 150 ℃ to 230 ℃.The process employs bis（1,4-di-tert-butyl-1,3-diazabutadienyl）iron（Ⅱ） as iron source and hydrogen gas or hydrogen plasma as the *** films deposited with hydrogen gas are demonstrated polycrystalline with body-centered cubic ***,for the films deposited with hydrogen plasma,the amorphous phase of iron carbide is *** influence of the deposition temperature on iron and iron carbide characteristics have been investigated.

关键词： Fe and Fe1-xCx films H2 plasma pulsed chemical vapor deposition

High-throughput and reliable acquisition of in vivo turnover number fuels precise metabolic engineering

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Synthetic and Systems Biotechnology 2022年第1期7卷 541-543页

作者： Zhenghong Li Chengyu Zhang zhengduo wang Hao Yan Chuan Li Zhiheng Yang Zilong Li Lixin Zhang Weishan wang Shenzhen Institute of Synthetic Biology Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences518055ShenzhenChina State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing100101China State Key Laboratory of Bioreactor Engineering And School of BiotechnologyEast China University of Science and Technology(ECUST)Shanghai200237China University of Chinese Academy of Sciences Beijing 100049China

As synthetic biology enters the era of quantitative biology,mathematical information such as kinetic parameters of enzymes can offer us an accurate knowledge of metabolism and growth of cells,and further guidance on precision metabolic engineering.k_(cat),termed the turnover number,is a basic parameter of enzymes that describes the maximum number of substrates converted to products each active site per unit *** reflects enzyme activity and is essential for quantitative understanding of ***,the k_(cat) values are measured in vitro,thus may not be able to reflect the enzyme activity in *** this case,Davidi et *** a surrogate K^(vivo)_(max)(k_(app))for kcat and developed a high throughput method to acquire K^(vivo)_(max)from omics *** et *** Chen et *** that the surrogate parameter can be a good embodiment of the physiological state of enzymes and exhibit superior performance for enzyme-constrained metabolic model to the default *** breakthroughs will fuel the development of system and synthetic biology.

关键词： Turnover number Genome scale models High throughput Metabolic reconstitution Machine learning

Integrating PCR-free amplification and synergistic sensing for ultrasensitive and rapid CRISPR/Cas12a-based SARS-CoV-2 antigen detection

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Synthetic and Systems Biotechnology 2021年第4期6卷 283-291页

作者： Xiangxiang Zhao zhengduo wang Bowen Yang Zilong Li Yaojun Tong Yuhai Bi Zhenghong Li Xuekui Xia Xiangyin Chen Lixin Zhang Weishan wang Gao-Yi Tan State Key Laboratory of Bioreactor Engineering and School of BiotechnologyEast China University of Science and Technology(ECUST)Shanghai200237China State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing100101China State Key Laboratory of Microbial Metabolism and School of Life Sciences&BiotechnologyShanghai Jiao Tong UniversityShanghai200240China CAS Key Laboratory of Pathogenic Microbiology and Immunology Institute of MicrobiologyCenter for Influenza Research and Early-warning(CASCIRE)CAS-TWAS Center of Excellence for Emerging Infectious Diseases(CEEID)Chinese Academy of SciencesBeijing100101China Key Biosensor Laboratory of Shandong Province Biology InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan250013China

Antigen detection provides particularly valuable information for medical diagnoses;however,the current detection methods are less sensitive and accurate than nucleic acid *** combination of CRISPR/Cas12a and aptamers provides a new detection paradigm,but sensitive sensing and stable amplification in antigen detection remain ***,we present a PCR-free multiple trigger dsDNA tandem-based signal amplification strategy and a de novo designed dual aptamer synergistic sensing *** of these two strategies endowed the CRISPR/Cas12a and aptamer-based method with ultra-sensitive,fast,and stable antigen *** a demonstration of this method,the limit of detection was at the single virus level(0.17 fM,approximately two copies/μL)in SARS-CoV-2 antigen nucleocapsid protein analysis of saliva or serum *** entire procedure required only 20 *** our system’s simplicity and modular setup,we believe that it could be adapted reasonably easily for general applications in CRISPR/Cas12a-aptamer-based detection.

关键词： CRISPR/Cas12a Aptamer Antigen detection SARS-CoV-2 PCR-Free amplification Synergistic sensing

Preparation of palladium-based catalyst by plasma-assisted atomic layer deposition and its applications in CO_(2) hydrogenation reduction

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Plasma Science and Technology 2024年第6期26卷 31-39页

作者：唐守贤田地李筝王正铎刘博文程久珊刘忠伟 Laboratory of Plasma Physics and Materials Beijing Institute of Graphic CommunicationBeijing 102600People’s Republic of China

Supported Pd catalyst is an important noble metal material in recent years due to its high catalytic performance in CO_(2)hydrogenation.A fluidized-bed plasma assisted atomic layer deposition(FP-ALD) process is reported to fabricate Pd nanoparticle catalyst over γ-Al_(2)O_(3)or Fe_(2)O_(3)/γ-Al_(2)O_(3)support,using palladium hexafluoroacetylacetonate as the Pd precursor and H_(2)plasma as *** transmission electron microscopy exhibits that highdensity Pd nanoparticles are uniformly dispersed over Fe_(2)O_(3)/γ-Al_(2)O_(3)support with an average diameter of 4.4 *** deposited Pd-Fe_(2)O_(3)/γ-Al_(2)O_(3)shows excellent catalytic performance for CO_(2)hydrogenation in a dielectric barrier discharge *** a typical condition of H_(2)to CO_(2)ratio of 4 in the feed gas,the discharge power of 19.6 W,and gas hourly space velocity of10000 h^(-1),the conversion of CO_(2)is as high as 16.3% with CH_(3)OH and CH4selectivities of 26.5%and 3.9%,respectively.

关键词： atomic layer deposition CO_(2)hydrogenation palladium based catalyst

大气压射流等离子体中O及OH自由基的发射光谱在线诊断

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强激光与粒子束 2010年第10期22卷 2461-2464页

作者：刘忠伟陈强王正铎杨丽珍李斌王传月北京印刷学院印刷包装材料与技术北京市重点实验室等离子体物理与材料实验室北京102600

OH自由基及氧原子在大气化学、表面处理及化学污染物分解等方面有着重要的作用。利用发射光谱技术在线测量了大气压射流等离子体中OH自由基紫外波段与O自由基777,844 nm波段的发射光谱。研究了OH自由基与氧原子光谱强度随放电功率及放... 详细信息

OH自由基及氧原子在大气化学、表面处理及化学污染物分解等方面有着重要的作用。利用发射光谱技术在线测量了大气压射流等离子体中OH自由基紫外波段与O自由基777,844 nm波段的发射光谱。研究了OH自由基与氧原子光谱强度随放电功率及放电体系中所加入的氧浓度的变化。将实验测得的OH自由基光谱图与用Lifbase数据库模拟光谱图进行比较,估算了OH自由基的转动温度。结果表明:OH自由基的转动温度随放电功率的增加而增加,随工作气体流速的增加而减小。

关键词：大气压等离子体射流自由基发射光谱等离子体诊断