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Flexible and densified graphene/waterborne polyurethane composite film with thermal conducting property for high performance electromagnetic interference shielding

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Nano Research 2022年第11期15卷 9926-9935页

作者： Wang Yang Hengxuan Bai Bo Jiang Chaonan Wang Weimin Ye Zhengxuan Li Chong Xu Xiaobai Wang Yongfeng Li State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Department of Materials Application Research AVIC Manufacturing Technology InstituteBeijing 100024China

High-performance electromagnetic interference(EMI)shielding materials with flexibility,excellent mechanical property,and thermal conductivity are highly desired for fifth-generation communications *** exhibits tremendous potential due to its high electrical conductivity and unique lamellar ***,the construction of densified graphene structure in polymer matrix is still ***,we develop a graphene/waterborne polyurethane(G/WPU)flexible film with densified and ordered layer-structure for using as an EMI shielding *** virtue of the polyvinylpyrrolidone modified strategy and facile liquid phase ball-milling treatment,the graphene nanosheets can be efficiently dispersed into the WPU substrate and tightly connected between each other via internal *** from the relatively low defects and densified structure of graphene,the resultant G/WPU film yields a high electrical conductivity of 1,004.5 S/m,and a tensile strength of around 48.5 *** a consequence,it achieves an average EMI shielding effectiveness of over 30 dB in the X-band with a thickness of merely 0.15 mm and the value is further enhanced to 73.4 dB at 0.9 mm with a low density of 1.4 g/cm^(3),offering over 99.99999%shielding of incident electromagnetic *** importantly,this G/WPU film also exhibits a high cross-plane thermal conductivity of about 1.13 W/(m·K).Thus,this work develops a high-performance EMI shielding material with both good capacity of heat transmission,but also provides a facile strategy for designing next-generation advanced,lightweight,flexible,and multifunction shielding materials.

关键词： electromagnetic interference shielding graphene densification flexible thermal conductivity

Placement suitability criteria of composite tape for mould surface in automated tape placement

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Chinese Journal of Aeronautics 2015年第5期28卷 1574-1581页

作者： Zhang Peng Sun Ronglei Zhao Xueying Hu Lingjin State Key Lab of Digital manufacturing Equipment and technology Huazhong University of Science and Technology avic Harbin Aircraft Industrial Group Co. Ltd.

Automated tape placement is an important automated process used for fabrication of large composite structures in aeronautical industry. The carbon fiber composite parts realized with this process tend to replace the aluminum parts produced by high-speed machining. It is difficult to determine the appropriate width of the composite tape in automated tape placement. Wrinkling will appear in the tape if it does not suit for the mould surface. Thus, this paper deals with establishing placement suitability criteria of the composite tape for the mould surface. With the assumptions for ideal mapping and by applying some principles and theorems of differential geometry, the centerline trajectory of the composite tape is identified to follow the geodesic. The placement suitability of the composite tape is examined on three different types of non-developable mould surfaces and four criteria are derived. The developed criteria have been used to test the deposition process over several mould surfaces and the appropriate width for each mould surface is obtained by referring to these criteria.

关键词： Automated tape placementGeodesic:Placement suitability Wrinkling Composites

Study of the Characteristics of DC and ICP Hybrid Discharge Plasmas

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Plasma Science and technology 2015年第3期17卷 191-195页

作者：王战高巍张彭闫慧杰任春生 avic Shenyang Aircraft Design & Research institute School of Physics and Optoelectronic technology Dalian University of Technology

In this paper, the double-discharge plasma generated by radio frequency （RF） and direct current （DC） has been investigated. In comparison with their single-frequency counterpart, the interaction between the two excitations is significant and beneficial. The results show that the RF discharge can effectively increase the DC discharge current and decrease the DC voltage; meanwhile the DC discharge is favorable to feed abundant high energy seed electrons to the ICP discharge sustaining at 13.56 MHz for the latter to acquire higher plasma density and lower plasma potential by increasing the ionization rate. The innovative design has been demonstrated to facilitate more homogeneous performance with higher plasma density.

关键词： ICP DC discharge Langmuir probe plasma characteristic

Multiscale structure and interface engineering of Fe/Fe_(3)C in situ encapsulated in nitrogen-doped carbon for stable and efficient multi-band electromagnetic wave absorption

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Journal of Materials Science & technology 2023年第27期158卷 9-20页

作者： Bo Jiang Wang Yang Hengxuan Bai Chen Zhang Siyuan Li Shaoxiong Du Ye Wang Li Sun Xiaobai Wang Yongfeng Li State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Changping 102249China Department of Materials Application Research AVIC Manufacturing Technology InstituteBeijing 100024China

Most reported electromagnetic wave absorption(EWA)materials show significant effective absorption in a certain frequency range,but their performances deteriorate dramatically as the frequency *** the range of working frequencies for electronic devices is gradually widening,it is of great interest to explore frequency-insensitive EWA materials that can achieve efficient absorption in every waveband by simply changing the absorption *** this end,a multi-scale absorber(Fe/Fe_(3) C@NC)is rationally synthesized by chemical foaming and in-situ growth *** controlling the growth of carbon nan-otubes,the Fe/Fe_(3) C@NC-2 exhibits a well-constructed 3D multi-scale *** to dipole po-larization,interface polarization and magnetic-dielectric energy conversion,the Fe/Fe_(3) C@NC-2 overcomes the frequency dispersion behavior and keeps a stable dielectric attenuation capability across the entire frequency ***,it delivers a superb full-band absorption of-50.1,-59.83,-55.87 and-51.91 dB in the S,C,X and Ku bands,*** maximum radar cross-sectional reduction reaches 35.44 dB m^(-2) when the incidentθis 20°,testifying its impressive ***,this EWA material also shows a remarkable resistance to oxidation and corrosion derived from the tightly coated carbon *** work provides new insight into the design of multi-band and stable EWA materials for practical application.

关键词： Multi-scale structure Heterogeneous interface Multiple bands Magnetic-dielectric composites Electromagnetic waves absorption

Impact of hydrogen microalloying on the mechanical behavior of Zr-bearing metallic glasses: A molecular dynamics study

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Journal of Materials Science & technology 2020年第10期42卷 198-206页

作者： Binbin Wang Liangshun Luo Fuyu Dong Liang Wang Hongying Wang Fuxin Wang Lei Luo Baoxian Su Yanqing Su Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin150001China School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870China avic manufacturing technology institute Beijing100024China

Comparative studies on Zr35Cu65and Zr65Cu35amorphous systems were performed using molecular dynamic simulations to explore whether their hydrogenated mechanical behavior depends on the content of hydride-forming *** both of them present an increased strength and ductility after hydrogen microalloying,we observe the improved mechanical behavior for Zr35Cu65is more pronounced than that for *** these two samples,the distribution of configurational potential energy and flexibility volume respectively follows a similar H-induced variation tendency;all of the hydrogenated alloys not just have more stable atoms with smaller flexibility volume,but possess a larger fraction of readily activated ***,the atomic-scale details,based on the local"gradient atomic packing structure"model,indicate minor additions of hydrogen can promote more"soft spots"along with more strengthened"backbones"in the low-Zr alloy than that in the high-Zr sample,which endows the former with much higher strength and deformability after hydrogen *** regard this finding as a further step forward to distilling the tell-tale metrics of the H-dependent mechanical behavior observed in Zr-based metallic glasses.

关键词： Metallic glasses Molecular dynamics Mechanical behavior Atomic structure Hydrogen

Magnetron sputtered nickel oxide with suppressed interfacial defect states for efficient inverted perovskite solar cells

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Journal of Energy Chemistry 2025年第1期100卷 348-355页

作者： Guoqiang Ma Qin Tan Zhaoning Li Jingwei Xiu Jiafeng Wang Tianle Cheng Dong He Qiang Sun Xuhang Ma Francesco Lamberti Zhubing He Department of Materials Science and Engineering Institute of Innovative Materials (I2M) Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG)Southern University of Science and Technology (SUSTech) Core Research Facilities Southern University of Science and Technology Department of Chemical Sciences Department of Industrial Engineering University of Padova

Widely used spin-coated nickle oxide （NiOx） based perovskite solar cells often suffer from severe interfacial reactions between the NiOxand adjacent perovskite layers due to surface defect states,which inherently impair device performance in a long-term view,even with surface molecule *** this study,we developed high-quality magnetron-sputtered NiOxthin films through detailed process optimization,and compared systematically sputtered and spin-coated NiOxthin film surfaces from materials to *** sputtered NiOxfilms exhibit improved crystallinity,smoother surfaces,and significantly reduced Ni3+or Ni vacancies compared to their spin-coated ***,the interface between the perovskite and sputtered NiOxfilm shows a substantially reduced density of defect *** solar cells （PSCs） fabricated with our optimally sputtered NiOxfilms achieved a high power conversion efficiency （PCE） of up to 19.93%and demonstrated enhanced stability,maintaining 86.2% efficiency during 500 h of maximum power point tracking under one standard sun ***,with the surface modification using (4-(2,7-dibromo-9,9-dimethylacridin-10（9H）-yl)butyl)p hosphonic acid （DMAcPA）,the device PCE was further promoted to 23.07%,which is the highest value reported for sputtered NiOxbased PSCs so far.

关键词： Nickle oxide Magnetron sputter Defect Stability Perovskite solar cell

Anti‑polyelectrolyte Zwitterionic Block Copolymers as Adaptable Uranium Harvester in High‑Salinity Environments:Catalyst‑Free Light‑Driven Polymerization and Conformational Dynamics Study

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Advanced Fiber Materials 2023年第6期5卷 1879-1891页

作者： Wei Wang Zeyu Liu Yiyun Geng Qiang Gao Jianfeng Jia Hao Li Jing Chen Gang Ye Collaborative Innovation Center of Advanced Nuclear Energy technology Institute of Nuclear and New Energy TechnologyTsinghua UniversityBeijing 100084China avic manufacturing technology institute Beijing 100024China China Academy of Engineering Physics Mianyang 621900China

Developing polymeric adsorbents for uranium harvesting from high-salinity environments remains a daunting challenge due to the‘polyelectrolyte effect’-induced conformational collapse compromising the ligand availability.A catalyst-free,visible light-controlled radical polymerization has been presented here for the tailor-made synthesis of zwitterionic block copolymers(BCPs)bearing uranophilic *** novel anti-polyelectrolyte uranium harvesters exhibited significant salinity *** facile and robust photosynthetic strategy offers a significantly high monomer conversion(α>95%)that facilitates“one-pot”chain extension to develop the *** catalyst residues,as found in conventional controlled radical polymerizations,are avoided and promoted to synthesize fascinating polymeric *** also highlight the first study,by integrating computational modeling with QCM-D analysis,on the interplay between polymer conformational dynamics and chemical adsorption *** zwitterionic polymer segments as conformational regulators,the BCPs exhibit remarkable‘anti-polyelectrolyte effect’by maintaining stretched conformations in saline *** ligand accessibility and promotion of diffusional mass transfer are achieved,enabling a high adsorption capacity toward uranium with remarkably fast kinetics in spiked natural seawater and salt lake brines.

关键词： Uranium harvesting Photo-controlled polymerization Zwitterionic block copolymers Conformation Antipolyelectrolyte effect

Structure and mechanical property of TC17 linear friction welding joint

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China Welding 2021年第1期30卷 43-47页

作者： Ji Yajuan Zhang Tiancang Zhang Lianfeng Guo Delun Aeronautical Key Laboratory for Welding and Joining Technologies AVIC Manufacturing Technology InstituteBeijing 100024China

TC17 titanium alloy which usually used on the fan and compressor disk were *** and mechanical property of joint were *** character of different part of joint was analyzed *** showed that the joints included three zones,base metal(BM),thermal mechanical affected zone(TMAZ)and weld zone(WZ).The microstructure of joint middle part was equiaxial grains,but the bottom part was the elongated *** recrystallation happened at the weld *** test result showed that joint tensile strength equal to that of the TC17 base *** average hardness value of the HAZ was 486 HV which was higher than that in the BM and WZ.

关键词： Titanium alloy linear friction welding microstructure tensile strength hardness

2D phosphides heterostructures on titanium microfiltration membrane for enhanced ampere-level current density overall seawater splitting

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Nano Research 2025年第1期18卷 249-259页

作者： Wenjing Dai Xin Wang Yulong Ma Sisi He Ming Chen Zhaohui Yin Shuheng Tian Maolin Wang Shixiang Yu Hang Zhang Yuanzhe Wang Hong Wang Jianxin Li Faming Gao Bowen Cheng Yun Wang Zhen Yin Ding Ma Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization College of Chemical Engineering and Materials ScienceTianjin University of Science and TechnologyTianjin 300457China State Key Laboratory of Biobased Fiber manufacturing technology Tianjin University of Science and TechnologyTianjin 300457China Haian institute of High-Tech Research Nanjing UniversityHaian 226600China Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Separation Membranes and Membrane Processes Separation Membrane Science and Technology International Joint Research CentreTiangong UniversityTianjin 300387China Centre for Catalysis and Clean Energy School of Environment and ScienceGold Coast CampusGriffith UniversitySouthportQueensland 4222Australia

The advancement of direct seawater electrolysis is a significant step towards sustainable hydrogen production,addressing the critical need for renewable energy sources and efficient resource ***,direct seawater electrolysis has to face several challenges posed by the corrosiveness of highly concentrated chloride and the competitive chlorine evolution reaction(ClER).To overcome these issues,we designed a novel NiP_(2)@CoP electrocatalyst on a porous titanium microfiltration(Ti MF)*** obtained bifunctional NiP_(2)@CoP catalyst outperforms the Pt/C and IrO_(2),as evidenced by its low overpotentials of 192 and 425 mV at a current density of 500 mA·cm^(-2) for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in alkaline seawater(1 M KOH+0.5 M NaCl),***,only 231 and 569 mV overpotentials are required at the current density of 1500 mA·cm^(-2) towards HER and OER in alkaline seawater,*** importantly,no ClER was observed,demonstrating its excellent selectivity to *** selection of porous Ti MF membrane as an electrode substrate further enhances the performance by providing a robust structure that promotes the fast generation and release of gas *** promising outcomes obtained with NiP_(2)@CoP catalysts on Ti MF support,therefore,pave the way for the commercial viability of direct seawater electrolysis technologies at industrial-level current densities.

关键词： direct seawater electrolysis porous titanium microfiltration membrane phosphides heterostructures NiP_(2)@CoP electrocatalyst excellent selectivity to oxygen evolution reaction(OER)