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Nuclear Science and Techniques 2023年第5期34卷 101-111页

作者： Fei Han wen-rui wang Dan-Yi Li Mou-Hua wang Ji-Hao Li Lin-Fan Li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Wuwei Institute of New Energy Wuwei 733000China

Silver nanoclusters(AgNCs)are a new type of nanomaterials with similar properties to molecules and unique applications.The applications of AgNCs can be significantly expanded by combining them with different matrix materials to obtain AgNC composites.Using irradiation techniques,we developed a simple two-step method for preparing silver nanocluster composites.First,polyacrylic acid(PAA)chains were grafted onto the surface of a PE film as templates(PE-g-PAA).Subsequently,silver ions were reduced in situ on the surface of the template material to obtain the AgNC composites(AgNCs@PE-g-PAA).The degree of AgNC loading on the composite film was easily controlled by adjusting the reaction conditions.The loaded AgNCs were anchored to the carboxyl groups of the PAA and wrapped in the graft chain.The particle size of the AgNCs was only 4.38±0.85 nm,with a very uniform particle size distribution.The AgNCs@PE-g-PAA exhibited fluorescence characteristics derived from the AgNCs.The fluorescence of the AgNCs@PE-g-PAA was easily quenched by Cr^(3+)ions.The composite can be used as a fluorescence test paper to realize visual detection of Cr^(3+).

关键词： Silver nanoclusters Irradiation grafting Irradiation reduction In situ preparation Fluorescence detection

Tuning Acceptor Length in Photocatalytic Donor-Acceptor Conjugated Polymers for Efficient Solar-to-Hydrogen Energy Conversion

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Chinese Journal of Chemistry 2022年第20期40卷 2457-2467页

作者： Qian Li Jia Li wen-rui wang Li-Na Liu Zi-wen Xu Guanghui Xie Jingjing Li Jianhua Yao Wei-Shi Li The Education Ministry Key Laboratory of Resource Chemistry Shanghai Normal UniversityShanghai200234 China CAS Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules ShanghaiInstitute of Organic ChemistryChinese Academy of Sciences345 Lingling RoadShanghai200032 China CAS Key laboratory of Energy Regulation Materials Shanghai Institute of Organic ChemistryChinese Academy of Sciences345 Lingling RoadShanghai200032 China Engineering Research Center of Zhengzhou for High Performance Organic Functional Materials Zhengzhou University of Technology6 Yingcai StreetHuiji DistrictZhengzhouHenan450044 China

The development of conjugated polymer photocatalysts for efficient solar-to-hydrogen energy conversion is highly desirable for the sustainability of our society.Although the construction of donor-acceptor(D-A)structure in conjugated polymer photocatalysts for solar-to-hydrogen energy conversion has been well documented,less attention has been paid on how large D and how large A units combined together could achieve the best performance.Herein,a series of D-A copolymers P(BDT-DBTSOx)(x=7,19,39,and 79)composed of a benzodithiophene(BDT)donor unit and an oligomeric dibenzo[b,d]thiophene sulfone(DBTSO)acceptor segment were synthesized and studied.It was found that the polymer photocatalytic stabilities under full-arc irradiation improved upon shortening the length of the acceptor segment.Under visible light irradiation and in the presence of 3 wt%Pt cocatalyst,P(BDT-DBTSO79)displayed the best performance with an optimal hydrogen evolution rate of 119.3±5.8 mmol·g^(-1)·h^(-1).This is 1.4-fold as that of DBTSO homopolymer and 22.5-fold as that of BDT/DBTSO alternative copolymer,highlighting the importance of acceptor length in D-A structure for achieving high photocatalytic performance.

关键词： Photocatalysis Water splitting Solar-to-hydrogen energy conversion Conjugated polymers Donor-acceptor systems

Characteristics of a coherent jet enshrouded in a supersonic fuel gas

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 173-180页

作者： Fei Zhao Rong Zhu wen-rui wang Key Laboratory of Fluid Interaction with Material University of Science and Technology BeijingBeijing 100083China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical Engineer University of Science and Technology BeijingBeijing 100083China

Based on a current coherent jet,this study proposes a supersonic combustion(SC)coherent jet in which the main oxygen jet is surrounded by a supersonic fuel gas.The characteristics of the proposed coherent jet are analyzed using experimental methods and numerical simulations in the high-temperature environment of electric arc furnace(EAF)steelmaking.The SC coherent jet achieved stable combustion in the EAF steelmaking environment.The simulated combustion temperature of the supersonic shrouding methane gas was 2930 K,slightly below the theoretical combustion temperature of methane–oxygen gas.The high speed and temperature of the supersonic flame effectively weakened the interaction between the main oxygen jet and the external ambient gas,inhibiting the radial expansion of the main oxygen jet and maintaining its high speed and low turbulence over a long distance.These features improved the impact capacity of the coherent jet and strengthened the stirring intensity in the EAF bath.

关键词： EAF steelmaking coherent jet supersonic shrouding fuel gas supersonic combustion field characteristics

Preparation of antibacterial non-woven AgNCs@PP-g-PAA via radiation method

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Nuclear Science and Techniques 2023年第9期34卷 21-31页

作者： Fei Han wen-rui wang Dan-Yi Li Si-Yi Xu Ying Su Lin Lin Man-Li Lu Ji-Hao Li Lin-Fan Li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Wuwei Institute of New Energy Wuwei 733000China

With the growing threat of airborne epidemics,there has been an increasing emphasis on personal protection.Masks serve as our primary external defense against bacteria and viruses that might enter the respiratory tract.Hence,it’s crucial to develop a polypropylene(PP)nonwoven fabric with quick antibacterial capabilities as a key component for masks.This study introduces silver nanoclusters(AgNCs)into non-woven PP using radiation technology to infuse antibacterial properties.Initially,a solid ligand(PP-g-PAA)was procured via radiation grafting of the ligand polyacrylic acid(PAA),which was incorporated into the nonwoven PP with the aid of a crosslinking agent at a lower absorbed dosage.Subsequently,AgNCs were synthesized in situ on PP-g-PAA via an interaction between PAA and AgNCs,leading directly to the formation of AgNCs@PP-g-PAA composites.Owing to the hydrophilicity of PAA,AgNCs@PP-g-PAA maintains good moisture permeability even when the voids are heavily saturated with PAA gel,preventing droplet aggregation by diffusing droplets on the surface of the material.This feature enhances the comfort of the masks.Most importantly,due to the incorporation of AgNCs,AgNCs@PP-g-PAA demonstrates outstanding antibacterial effects against Escherichia coli and Staphylococcus aureus,nearly achieving an instant“touch and kill”outcome.In conclusion,we synthesized a modified nonwoven fabric with significant antibacterial activity using a simple synthetic route,offering a promising material that provides improved personal protection.

关键词： Silver nanoclusters Radiation technology Antibacterial

Dynamic characteristics of the planetary gear train excited by time-varying meshing stiffness in the wind turbine

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International Journal of Minerals,Metallurgy and Materials 2018年第9期25卷 1104-1112页

作者： rui-ming wang Zhi-ying Gao wen-rui wang Yang Xue De-yi Fu State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute School of Mechanical Engineering University of Science and Technology Beijing

Wind power has attracted increasing attention as a renewable and clean energy. Gear fault frequently occurs under extreme environment and complex loads. The time-varying meshing stiffness is one of the main excitations. This study proposes a 5 degree-of-freedom torsional vibration model for the planetary gear system. The influence of some parameters(e.g., contact ratio and phase difference) is discussed under different conditions of a single teeth pair and double pairs of teeth. The impact load caused by the teeth face fault, ramped load induced by the complex wind conditions, and the harmonic excitation are investigated. The analysis of the time-varying meshing stiffness and the dynamic meshing force shows that the dynamic design under different loads can be made to avoid resonance, can provide the basis for the gear fault location of a wind turbine, and distinguish the fault characteristics from the vibration signals.

关键词： wind turbine planetary gear time-varying meshing stiffness dynamic characteristics

Terrain reconstruction from Chang'e-3 PCAM images

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Research in Astronomy and Astrophysics 2015年第7期15卷 1057-1067页

作者： wen-rui wang Xin Ren Fen-Fei wang Jian-Jun Liu Chun-Lai Li National Astronomical Observatories Chinese Academy of Sciences

The existing terrain models that describe the local lunar surface have limited resolution and accuracy, which can hardly meet the needs of rover navigation,positioning and geological analysis. China launched the lunar probe Chang＇e-3 in December, 2013. Chang＇e-3 encompassed a lander and a lunar rover called ＂Yutu＂（Jade Rabbit）. A set of panoramic cameras were installed on the rover mast. After acquiring panoramic images of four sites that were explored, the terrain models of the local lunar surface with resolution of 0.02 m were reconstructed. Compared with other data sources, the models derived from Chang＇e-3 data were clear and accurate enough that they could be used to plan the route of Yutu.

关键词： space vehicles： rover -- space vehicles： instruments： panoramic camera-- methods： terrain reconstruction -- techniques： image processing： orthoimage

Anti-penetration performance of high entropy alloy–ceramic gradient composites

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International Journal of Minerals,Metallurgy and Materials 2018年第11期25卷 1320-1328页

作者： wen-rui wang Hui-fa Xie Lu Xie Han-lin Li Xiao Yang Yi-nan Shen School of Mechanical Engineering University of Science and Technology Beijing Loughborough Design School Loughborough University Technical Institute of Physical and Chemistry Chinese Academy of Sciences School of Energy and Environmental Engineering University of Science and Technology Beijing

A high-entropy alloy–ceramic gradient composite of TiC–TiB_2/75vol% Al_(0.3) CoCrFe Ni was successfully prepared by combustion synthesis under an ultra-high gravity field, which is a low-cost method with high efficiency. The ceramic particles were gradient distributed in the Al_(0.3) CoCrFe Ni matrix, and the hardness of the composite material gradually decreased along the thickness direction. The anti-penetration performance of the gradient composites was simulated using the ANSYS/LS-DYNA explicit simulation program. The results demonstrate that the distribution of the ceramic particles strongly affected the mechanical properties and the anti-penetration performance of the composites. With the same total ceramic volume fraction, the gradient composites exhibit better anti-penetration performance than the corresponding ceramic–metal interlayer composites. The more uneven the ceramic distribution, the greater the elastic modulus and yield stress of the surface layer and, thus, the better the anti-penetration performance.

关键词： combustion synthesis gradient composite anti-penetration performance numerical simulation

Powder metallurgy of high-entropy alloys and related composites: A short review

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International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 931-943页

作者： Bo-ren Ke Yu-chen Sun Yong Zhang wen-rui wang Wei-min wang Pei-yan Ma Wei Ji Zheng-yi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China

High-entropy alloys(HEAs)have attracted increasing attention because of their unique properties,including high strength,hardness,chemical stability,and good wear resistance.Powder metallurgy is one of the most important methods used to fabricate HEA materials.This paper introduces the methods used to synthesize HEA powders and consolidate HEA bulk.The phase transformation,microstructural evolution,and mechanical properties of HEAs obtained by powder metallurgy are summarized.We also address HEA-related materials such as ceramic–HEA cermets and HEA-based composites fabricated by powder metallurgy.

关键词： high-entropy alloys powder metallurgy mechanical alloying consolidation

Superior corrosion resistance-dependent laser energy density in(CoCrFeNi)95Nb5 high entropy alloy coating fabricated by laser cladding

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International Journal of Minerals,Metallurgy and Materials 2021年第5期28卷 888-897页

作者： wen-rui wang Wu Qi Xiao-li Zhang Xiao Yang Lu Xie Dong-yue Li Yong-hua Xiang School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of Fluid Interaction with Material Ministry of EducationBeijing 100083China R&D management department China nuclear power technology research institute Co.Ltd.Shenzhen 518031China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Unit 92228 People’s Liberation ArmyBeijing 100072China

(CoCrFeNi)95Nb5 high entropy alloy(HEA)coatings were successfully fabricated on a substrate of Q235 steel by laser cladding technology.These(CoCrFeNi)95Nb5 HEA coatings possess excellent properties,particularly corrosion resistance,which is clearly superior to that of some typical bulk HEA and common engineering alloys.In order to obtain appropriate laser cladding preparation process parameters,the effects of laser energy density on the microstructure,microhardness,and corrosion resistance of(CoCrFeNi)95Nb5 HEA coating were closely studied.Results showed that as the laser energy density increases,precipitation of the Laves phase in(CoCrFeNi)95Nb5 HEA coating gradually decreases,and diffusion of the Fe element in the substrate intensifies,affecting the integrity of the(CoCrFeNi)95Nb5 HEA.This decreases the microhardness of(CoCrFeNi)95Nb5 HEA coatings.Moreover,the relative content of Cr2O3,Cr(OH)3,and Nb2O5 in the surface passive film of the coating decreases with increasing energy density,causing corrosion resistance to decrease.This study demonstrates the controllability of a high-performance HEA coating using laser cladding technology,which has significance for the laser cladding preparation of other CoCrFeNi-system HEA coatings.

关键词： high entropy alloy coating laser cladding technology laser energy density corrosion resistance

A new lunar absolute control point: established by images from the landing camera on Chang'e-3

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Research in Astronomy and Astrophysics 2014年第12期14卷 1543-1556页

作者： Fen-Fei wang Jian-Jun Liu Chun-Lai Li Xin Ren Ling-Li Mu Wei Yan wen-rui wang Jing-Tao Xiao Xu Tan Xiao-Xia Zhang Xiao-Duan Zou Xing-Ye Gao Key Laboratory of Lunar and Deep Space Exploration National Astronomical ObservatoriesChinese Academy of Sciences

The establishment of a lunar control network is one of the core tasks in selenodesy, in which defining an absolute control point on the Moon is the most im- portant step. However, up to now, the number of absolute control points has been very sparse. These absolute control points have mainly been lunar laser ranging retrore- flectors, whose geographical location can be observed by observations on Earth and also identified in high resolution lunar satellite images. The Chang＇e-3 （CE-3） probe successfully landed on the Moon, and its geographical location has been monitored by an observing station on Earth. Since its positional accuracy is expected to reach the meter level, the CE-3 landing site can become a new high precision absolute control point. We use a sequence of images taken from the landing camera, as well as satellite images taken by CE-1 and CE-2, to identify the location of the CE-3 lander. With its geographical location known, the CE-3 landing site can be established as a new abso- lute control point, which will effectively expand the current area of the lunar absolute control network by 22%, and can greatly facilitate future research in the field of lunar surveying and mapping, as well as selenodesy.

关键词： Moon -- methods： data analysis -- techniques： image processing