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Preparation of Flaky Hexagonal Nanoporous Au-Cu and Au Particles via Dealloying

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1777-1786页

作者： Jing Deng Yuan-Yun Zhao Yong Shen Chuntao Chang Qiang Li School of Physics Science and Technology Xinjiang UniversityUrumqi 830046China neutron scattering Technical Engineering Research center School of Mechanical EngineeringDongguan University of TechnologyDongguan 523808China Guangdong-HongKong-Macao Joint Laboratory for Neutron Scattering Science and TechnologyDongguan University of TechnologyDongguan 523808China Instituteof Metal Research Chinese Academy of SciencesShenyang 110016China

Nanoporous metals have attracted signifi cant attention owing to their excellent physical,chemical,and biological ***,preparing ultrafi ne nanoporous metal particles(1–5μm)with specifi c geometries remains ***,we report a simple strategy to prepare ultrafi ne fl aky hexagonal nanoporous Au-Cu and Au particles via ***-based alloy ribbons with ultrafi ne fl aky hexagonal Mg-Au(Cu)-Gd particles dispersed in a Mg-Cu(Au)-Gd metallic glassy matrix were *** size and morphology of the precipitated fl aky hexagonal Mg-Au(Cu)-Gd particles were controlled by the solidifi cation process of a Mg 61 Cu 21 Au 7 Gd 11 alloy *** ne fl aky hexagonal nanoporous Au-Cu particles(diagonal diameter 2.58±0.44μm,ligament size~28 nm),Au-1 particles(diagonal diameter 2.38±0.35μm,ligament size~83 nm)and Au-2 particles(diagonal diameter 2.39±0.44μm,ligament size~66 nm)were prepared via ultrasonic-assisted dealloying of Mg 61 Cu 21 Au 7 Gd 11 alloy ribbons in 0.25 M HCl/ethanol,1 M HCl/ethanol and 0.25 M HNO 3/ethanol solutions,*** ultrafi ne fl aky hexagonal nanoporous Au-Cu and Au particles with a large specifi c surface area have a uniform particle size and shape,implying that they possess adequate powder fl uidity and excellent catalytic ***,the formation mechanism of the MgAu(Cu)Gd phase in solidifi ed Mg-Cu-Au-Gd alloys was *** study provides a novel approach for synthesizing nanoporous metal particles with a specifi c geometry.

关键词： Metallic glasses Mg-based alloys Dealloying Nanoporous particles Mg-Au-Gd phase

Design and implementation of the monochromator shielding for the cold neutron spectrometers XINGZHI and BOYA

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Chinese Physics B 2024年第5期33卷 96-102页

作者：汪晋辰刘娟娟徐大业 Florian Grünauer 郝丽杰刘蕴韬张红霞程鹏鲍威 Laboratory for neutron scattering and Beijing Key Laboratory of Optoelectronic Functional Materials and MicroNano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China Physics Consulting Zorneding 85604Germany China Institute of Atomic Energy Beijing 102413China Department of Physics City University of Hong KongKowloon 999077China center for neutron scattering City University of Hong KongKowloon 999077China

An innovative monochromator shielding is designed and implemented for the cold neutron spectrometers XINGZHI and BOYA operated by Renmin University of China at China Advanced Research *** Monte Carlo simulations and careful mechanical designs,a shielding configuration has been successfully developed to satisfy safety requirements of below 3μSv/h dose rate at its exterior,meanwhile fulfilling space,floor load and nonmagnetic *** materials are utilized to form the sandwich-type shielding walls:the inner layer of boron carbide rubber,the middle layer of steel-encased lead and the outer layer of borated ***-shaped liftable shielding blocks are incorporated to facilitate a continuous adjustment of the neutron energy while preventing radiation *** work has demonstrated that by utilizing composite shielding materials,along with the sandwich structure and liftable shielding blocks,a compact and lightweight shielding solution can be *** enables the realization of advanced neutron scattering instruments that provide expanded space of measurement,larger energy and momentum coverage,and higher flux on the *** shielding represents the first of its kind in neutron scattering instruments in *** its successful operation,it has been subsequently employed by other neutron instruments across the country.

关键词： neutron scattering cold neutron spectrometer monochromator shielding sandwich shielding structure

Effects of phosphorus doping on the physical properties of axion insulator candidate EuIn_(2)As_(2)

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Chinese Physics B 2022年第5期31卷 641-646页

作者： Feihao Pan Congkuan Tian Jiale Huang Daye Xu Jinchen Wang Peng Cheng Juanjuan Liu Hongxia Zhang Laboratory for neutron scattering and Beijing Key Laboratory of Optoelectronic Functional Materials and MicroNano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China

We report an investigation on the single crystal growth,magnetic and transport properties of Eu In_(2)(As_(1-x)P_(x))_(2(0≤x≤1).The physical properties of axion insulator candidate Eu In;As;can be effectively tuned by *** increasing x,the c-axis lattice parameter decreases linearly,the magnetic transition temperature gradually increases and ferromagnetic interactions are *** is similar to the previously reported high pressure effect on Eu In_(2)As_(2).For x=0.40,a spin glass state at T_(g)=10 K emerges together with the observations of a butter-fly shaped magnetic hysteresis and slow magnetic ***,magnetic transition has great influence on the charge carriers in this system and negative colossal magnetoresistance is observed for all P-doped *** findings suggest that Eu In_(2)(As_(1-x)P_(x))_(2) is a promising material playground for exploring novel topological states.

关键词： axion topological insulator

Superconductivity in Kagome Metal YRu_(3)Si_(2)with Strong Electron Correlations

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Chinese Physics Letters 2022年第8期39卷 59-64页

作者： Chunsheng Gong Shangjie Tian Zhijun Tu Qiangwei Yin Yang Fu Ruitao Luo Hechang Lei Laboratory for neutron scattering and Beijing Key Laboratory of Optoelectronic Functional Materials&MicroNano DevicesDepartment of PhysicsRenmin University of ChinaBeijing 100872China

We report the detailed physical properties of YRu_(3)Si_(2)with the Ru kagome lattice at normal and superconducting *** results of resistivity and magnetization show that YRu_(3)Si_(2)is a type-II bulk superconductor with T_(c)~3.0 *** specific heat measurement further suggests that this superconductivity could originate from the weak or moderate electron-phonon *** the other hand,both large Kadawaki–Woods ratio and Wilson ratio indicate that there is a strong electron correlation effect in this system,which may have a connection with the featured flat band of kagome lattice.

关键词： Strong (3) Electron

Fabrication of Ni–Mo–Nb metallic glass/micro-nano lattice composite for nonenzymatic glucose sensing

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Progress in Natural Science:Materials International 2023年第5期33卷 601-606页

作者： Sihan Zhang Wentao Zhang Yu Lou Zixin Rui Zhongzheng Yao Ao Yan Lan Tan Sinan Liu Jiacheng Ge He Zhu Si Lan Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology School of Materials Science and Engineering Henan University of Technology center for neutron scattering City University of Hong Kong Shenzhen Research Institute

The rising global diabetic population has ignited significant interest in enzyme-free electrochemical glucose ***,their widespread usage has been severely impeded by the lack of sensing probes with both high sensitivity and *** this work,we present a novel approach for conformally depositing a Ni-Mo-Nb metallic-glass film onto a three-dimensional printed polymer skeleton for glucose *** printing template is designed based on a six-membered tricapped trigonal prism(6M-TTP) structure,which is derived from a medium-range order structure motif observed in amorphous *** fabricated composite combines the high electrochemical activity of Ni-Mo-Nb amorphous alloy with the stability afforded by the micro-nano lattice structure,resulting in a high sensitivity(482 μA mM-1cm-2),a wide linear range(0-1 mM and 1-5 mM),a low detection limit(2.94 μM),and good long-term stability and selectivity in alkaline *** work has proposed a new avenue to fabricate complex micro-nano electrodes,potentially offering significant versatility and great promise for widespread applications in the field of electrochemistry.

关键词： Glucose

Evaluation of neutron beam characteristics for D-BNCT01 facility

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Nuclear Science and Techniques 2022年第1期33卷 131-139页

作者： Jun-Yang Chen Jian-Fei Tong Zhi-Liang Hu Xue-Fen Han Bin Tang Qian Yu Rui-Qiang Zhang Chong-Guang Zhao Jun Xu Shi-Nian Fu Bin Zhou Tian-Jiao Liang Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China University of Chinese Academy of Sciences(UCAS) Beijing 100049China Spallation neutron Source Science center Dongguan 523803China Guangdong-Hong Kong-Macao Joint Laboratory for neutron scattering Science and Technology Dongguan 523803China

An accelerator-based Boron neutron Capture Therapy(AB-BNCT)experimental facility called D-BNCT01 has been recently completed and is currently able to generate a high-intensity neutron beam for BNCTrelated *** this study,we perform several experiments involving water phantoms to validate the Monte Carlo simulation results and analyze the neutron beam *** to our measurements,D-BNCT01 can generate a neutron flux about 1.2×10^(8)n/cm^(2)/s at the beam port using a 5 kW proton *** results also show that the thermal neutron flux depth distribution inside the water phantom is in good agreement with *** conclude that D-BNCT01 may be effectively employed for BNCT research.

关键词： neutron beam Boron neutron capture therapy Water phantom

Phase transformation behavior of a dual-phase nanostructured Fe-Ni-B-Si-P-Nb metallic glass and its correlation with stress-impedance properties

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Rare Metals 2023年第8期42卷 2757-2766页

作者： Jia-Cheng Ge Ai-Hua Liu Zhen-Duo Wu Yao Gu Yu-Bin Ke An-Ding Wang Yang Ren Song Tang Hui-Qiang Ying He Zhu Xun-Li Wang Si Lan Herbert Gleiter Institute of Nanoscience School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Department of Physics City University of Hong KongHong Kong999077China City University of Hong Kong(Dongguan) Dongguan 523000China center for neutron scattering City University of Hong Kong Shenzhen Research InstituteShenzhen 518057China Spallation neutron Source Science center Dongguan 523803China Guangdong-Hong Kong-Macao Joint Laboratory for neutron scattering Science and Technology Dongguan 523803China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

A study of the phase transformation process of a Fe-Ni-B-Si-P-Nb metallic glass using a suite of advanced characterization tools is *** electron microscopy(TEM)and small angle neutron scattering(SANS)experiments show that the as-spun metallic glass ribbon has a dual-phase structure with bcc nanoclusters of a size of 2-3 *** situ high-energy X-ray diffraction(XRD)reveals a three-stage crystallization process when heating the metallic glass into supercooled liquid *** isothermal annealing experiment shows the nanoclusters grow instantly without *** easy formation and phase stability of the nanoclusters are due to the low interfacial energy between the amorphous matrix and clusters,as real space analysis shows that the nanoclusters and the amorphous matrix share similar short-to-mediumrange *** further find that the dual-phase structure reduces local magneto-anisotropy and enhances effective magnetic permeability,resulting in an excellent stressimpedance effect without sacrificing *** work sheds light on the structure-property engineering of soft magnetic metallic glasses and provides a foundation for developing novel magnetic functional materials with nanostructured dual-phases.

关键词： Soft-magnetic property Metallic glass Phase transformation Synchrotron and neutron scattering Stressimpedance(SI)

Facile synthesis of metal and alloy nanoparticles by ultrasound-assisted dealloying of metallic glasses

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Journal of Materials Science & Technology 2021年第23期82卷 144-152页

作者： Yuan-Yun Zhao Feng Qian Wenfeng Shen Chengliang Zhao Jianguo Wang Chunxiao Xie Fengling Zhou Chuntao Chang Yanjun Li neutron scattering Technical Engineering Research center School of Mechanical EngineeringDongguan University of TechnologyDongguan523808China Department of Materials Science and Engineering Norwegian University of Science and TechnologyTrondheim7491Norway Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Guangdong-Hong Kong-Macao Joint Laboratory for neutron scattering Science and Technology Dongguan University of TechnologyDongguan523808China

Metal and alloy nanoparticles synthesized by chemical reduction have attracted increasing attention due to their superior physical,chemical,and biological ***,most chemical synthesis processes rely on the use of harsh reducing agents and complicated chemical ***,we report a novel reduction-agent-free and surfactant(stabilizer)-free strategy to synthesize Cu,Ag,Au,Cu-Pt,Cu-Au,Cu-Au-Pt-Pd,and Au-Pt-Pd-Cu nanoparticles by ultrasound-assisted dealloying of Mgbased metallic *** formation mechanism of the metal and alloy nanoparticles is revealed by a detailed investigation of sequential intermediate *** demonstrate that the glass-liquid phase transition of the initially dealloying metallic glasses,together with the synergistic effect of dealloying and ultrasound-driven ligament-breakage of small enough nanoporous intermediates,play key roles in preparing the uniformly dispersed metal and alloy *** approach greatly simplifies the up-scaling synthesis of monometallic and bimetallic nanoparticles,and also provides a general strategy for synthesizing unprecedented multimetallic nanoparticles.

关键词： Metallic glasses Dealloying Ultrasound Nanoparticles Multimetallic nanoparticles

Numerical simulation of bistatic scattering from fractal rough surface in the finite element method

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Science China(Technological Sciences) 2001年第1期44卷 12-18页

作者：李中新金亚秋 center for Wave scattering and Remote Sensing Fudan University Shanghai China

By using the Monte Carlo method and numerical finite elementapproach, bistatic scattering from the fractal and Gaussian rough surfaces is studied. The difference between these two surfaces and their functional dependence on the surface parameters are discussed. Angular variation of bistatic scattering from the fractal surface is very significant, even for fairly smooth surface, whilst scattering from the Gaussian rough surface tends to the specular reflection. The slope of angular variation is linearly related with the fractal dimension. If an electrically_large target is placed over the rough surface, the fractal dimension inverted from bistatic scattering would be reduced. As the surfaces become very rough, scattering from different fractal and Gaussian surfaces would be not identified.

关键词： fractal rough surface Monte Carlo method finite element method