检索结果-南通市图书馆

Outstanding strength and conductivity of metallic glass composites with multiscale configuration

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第9期42卷 3099-3113页

作者： Wei-Zong Bao Jie Chen Jun-Zhi Li Bo-Hua Yu Chu-Yuan Liu Ping Jiang Zu-Jia Liu Kai-Tao Hu Dmitri V.Louzguine-Luzgin Guo-Qiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen518055China Advanced institute for Materials research(WPI-AIMR) Tohoku UniversitySendai980-8577Japan MathAM-OIL National Institute of Advanced Industrial Science and Technology(AIST)Sendai980-8577Japan state Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China

Cu-based composites with multiscale configuration for electrical contact applications are fabricated via a ball milling(BM)-spark plasma sintering(SPS)-aging *** strengthening of the Cu alloy matrix by micro-scale metallic glass particles and nanoscale intracrystalline precipitation phases is *** annealing technique achieves the decomposition of solute atoms in the Cu alloy,ensuring the excellent electrical properties of the matrix conductive *** composite with multiscale configuration achieves an outstanding combination of ultimate compressive strength of(1114±15)MPa and electrical conductivity of 33.0%±1.1%International Annealed Copper Standard(IACS)after annealing at 400.C for 10.0 *** of the strengthening and conductivity mechanisms suggests that the precipitation of the Cr-rich phase within the matrix crystals is a critical contributor to the concerted enhancement of strength and *** addition,the positive role of nanocrystals precipitated at the edges of metallic glass particles on the interfacial bonding of composites is addressed.

关键词： Metallic glass composites Multiscale configuration Strength Conductivity

Crystallization and Preliminary Crystallographic Analysis of β-Trichosanthin,an Isoform of Trichosanthin from the Root Tuber of Trichosanthe kirilowii

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2007年第11期26卷 1303-1307页

作者：侯晓敏陈明晃彭奇陈荔清 Meehan Edward J 黄明东 state Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterThe Chinese Academy of Sciences Laboratory for Structural Biology Department of ChemistryGraduate Programs of BiotechnologyChemistry and Materials ScienceUniversity of Alabama in Huntsville

β-Trichosanthin, a type 1 ribosome-inactivating protein （RIP） isolated from the root tuber of Trichosanthe kirilowii Maxim, is an isoform of trichosanthin. Here we report its crystallization in two crystal forms using the hanging-drop vapor-diffusion method. The form A and form B crystals belong to the orthorhombic space group P212121 and monoclinic space group P21, respectively. X-ray data have been collected to 1.6 and 1.2 A resolution for form A and form B crystals, respectively, using a synchrotron source.

关键词： ribosome-inactivating protein isoform trichosanthin crystallization

Highly stretchable and reliable graphene oxide- reinforced liquid gating membranes for tunable gas/liquid transport

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2020年第1期6卷 717-727页

作者： Wei Lv Zhizhi Sheng Yinglin Zhu Jing Liu Yi Lei Rongrong Zhang Xinyu Chen Xu Hou Department of Physics Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Materials ResearchJiujiang Research InstituteCollege of Physical Science and TechnologyXiamen University361005 XiamenChina state Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen University361005 XiamenChina Collaborative Innovation Center of Chemistry for Energy Materials Xiamen University361005 XiamenChina

The ability of membrane technologies to dynamically tune the transport behavior for gases and liquids is critical for their *** various methods have been developed to improve membrane success,tradeoffs still exist among their properties,such as permeability,selectivity,fouling resistance,and stability,which can greatly affect the performance of *** elastomeric membrane designs can provide antifracture properties and flexibility;however,these designs still face certain challenges,such as low tensile strength and ***,researchers have not yet thoroughly developed membranes that can avoid fouling issues while realizing precise dynamic control over the transport *** this study,we show a versatile strategy for preparing graphene oxide-reinforced elastomeric liquid gating membranes that can finely modulate and dynamically tune the sorting of a wide range of gases and liquids under constant applied ***,the produced membranes exhibit antifouling properties and are adaptable to different length scales,pressures,and *** filling of graphene oxide in the thermoplastic polyurethane matrix enhances the composites through hydrogen *** and theoretical calculations are carried out to demonstrate the stability of our *** membrane exhibits good stretchability,recovery,and durability due to the elastic nature of the solid matrix and dynamic nature of the gating *** control over the transport of gases and liquids is achieved through our optimized interfacial design and controllable pore deformation,which is induced by mechanical *** strategy will create new opportunities for many applications,such as gas-involved chemical reactions,multiphase separation,microfluidics,multiphase microreactors,and particulate material synthesis.

关键词： transport fouling liquid

Silicon-based optical phased array with a reconfigurable aperture for“gaze”scanning of LiDAR

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics research 2024年第5期12卷 932-940页

作者： HEMING HU YAFANG HE BAISONG CHEN ZIMING WANG YINGZHI LI QIJIE XIE QUANXIN NA ZIHAO ZHI XUETONG LI HUAN QU PATRICK LO JUNFENG SONG state Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Peng Cheng Laboratory Shenzhen 518000China Advance Micro Foundry Pte.Ltd. Singapore 117685Singapore

Light detection and ranging(LiDAR)serves as one of the key components in the fields of autonomous driving,surveying mapping,and environment ***,dense points clouds are pursued by LiDAR systems to provide high-definition 3D ***,the LiDAR is typically used to produce abundant yet redundant data for scanning the homogeneous background of scenes,resulting in power waste and excessive processing ***,it is highly desirable for a LiDAR system to“gaze”at the target of interest by dense scanning and rough sparse scans on the uninteresting ***,we propose a LiDAR structure based on an optical phased array(OPA)with reconfigurable apertures to achieve such a gaze scanning *** virtue of the cascaded optical switch integrated on the OPA chip,a 64-,128-,192-,or 256-channel antenna can be selected discretionarily to construct an aperture with variable *** corresponding divergence angles for the far-field beam are 0.32°,0.15°,0.10°,and 0.08°,*** reconfigurable-aperture OPA enables the LiDAR system to perform rough scans via the large beam spots prior to fine scans of the target by using the tiny beam *** this way,the OPA-based LiDAR can perform the“gaze”function and achieve full-range scanning *** scanning time and power consumption can be reduced by 1/4 while precise details of the target are ***,we embed the OPA into a frequency-modulated continuous-wave(FMCW)system to demonstrate the“gaze”function in beam *** results show that the number of precise scanning points can be reduced by 2/3 yet can obtain the reasonable outline of the *** reconfigurable-aperture OPA(RA-OPA)can be a promising candidate for the applications of rapid recognition,like car navigation and robot vision.

关键词： reconfigurable optical antenna

Fabrication of porous TiZrNbTa high-entropy alloys/Ti composite with high strength and low Young’s modulus using a novel MgO space holder

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第36期167卷 59-73页

作者： Tao Xiang Jie Chen Weizong Bao Shuyan Zhong Peng Du Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China state Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Stress shielding is caused by the mismatch of stiffness between bone and implant materials,which may give rise to bone resorption and loosening,thereby causing implantation *** is a huge gap between Young’s modulus of human bone and low Young’s modulusβTi alloys.A porous structure design can achieve the target of low Young’s modulus,and thus achieve the matching between human bone and implant ***,a suitable space holder(SH)that can be applied at high temperatures and sintering pressure has not been *** this study,the TiZrNbTa/Ti titanium matrix composite(TMC)with high strength and large ductility was used as scaffold materials and combined the SH technique with the spark plasma sintering(SPS)technique to obtain a porous structure.A novel space holder,i.e.,MgO particles was adopted,which can withstand high-temperature sintering accompanied by a sintering *** porous TiZrNbTa/Ti with 40 vol.%MgO added exhibits a maximum strength of 345.9±10.4 MPa and Young’s modulus of 24.72±0.20 GPa,*** possesses higher strength compared with human bone and matches Young’s modulus of human bone,which exhibits great potential for clinical application.

关键词： TiZrNbTa/Ti titanium matrix composite MgO space holder Low Young’s modulus High strength

Phase-tunable equiatomic and non-equiatomic Ti-Zr-Nb-Tahigh-entropy alloys with ultrahigh strength for metallic biomaterials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第22期117卷 196-206页

作者： Tao Xiang Peng Du Zeyun Cai Kun Li Weizong Bao Xinxin Yang Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China state Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The contradiction between the strength and ductility of metallic materials is a major scientific problemthat has been researched for a long time. Dual-phase equiatomic and non-equiatomic Ti-Zr-Nb-Ta highentropy alloys (HEAs) with super-high strength and excellent ductility have been successfully developedvia mechanical alloying (MA) combined with spark plasma sintering (SPS) technology. This is adjustedby altering the atomic ratios of the different phases. X-ray diffraction (XRD) and transmission electronmicroscopy (TEM) were performed to confirm the dual-phase microstructure. After the SPS process, theaverage grain size of the aforementioned equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs (134 ± 50 nm) evaluated byelectron back-scattering diffraction (EBSD) is smaller than that of the Ti-Zr-Nb-Ta HEAs (150 μm), whichwere fabricated using arc melting. According to the Hall-Petch formula, the grain boundary strengthening contribution in the Ti-Zr-Nb-Ta system is 33-fold higher than those fabricated using the arc-meltingprocess. When the alloy phase comprises the equivalent dual-phase, equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAshave good comprehensive performance compared to non-equiatomic Ti-Zr-Nb-Ta HEAs prepared usingthe same process. The yield strength of equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs (2212 ± 38 MPa) is two-foldhigher than that of Ti-Zr-Nb-Ta HEAs (1100 ± 90 MPa) fabricated via arc melting. This can be attributed tothe ultra-fine grain size. Notably, the equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs possess approximately the samebiocompatibility as commercial pure Ti (CP-Ti), indicating that the equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs areprovided with a possibility as an advanced biomaterial for the applications of the medical field.

关键词： Equiatomic Nb_(25)Ta_(25)Ti_(25)Zr_(25)HEAs Ultra-fine grain Phase-tunable Mechanical properties Biocompatibility

Optimized strength and conductivity of multi-scale copper alloy/metallic glass composites tuned by a one-step spark plasma sintering(SPS)process

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第33期128卷 22-30页

作者： Weizong Bao Jie Chen Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China state Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

A superiority in interfacial bonding is favorable to fabricate high-strength conductive composites for electrical contact *** the present work,high strength and high conductivity multi-scale metallic glass composites(including micron-scale Cu Zr Al metallic glass reinforcement,hundred-nanometer-scale Cu Cr Zr crystalline grain matrix,and nano-scale precipitated phase)were fabricated by a one-step spark plasma sintering(SPS).The strength and conductivity of the bulk copper matrix metallic glass composites(BCMGCs)were enhanced simultaneously with the increase in the sintering pressure of the *** excellent performance is attributed to the improved interfacial bonding between the metallic glass reinforcement and the copper alloy matrix due to the high pressure assisted by temperature and pulsed *** particular,the precipitation of nanoprecipitates at the interface further reduces the interfacial resistance and improves the mechanical properties of the *** work broadens the horizon for the selection and optimization of reinforcements and manufacturing processes for high-performance electrical contact materials(ECMs).

关键词： CuZrAl metallic glass Spark plasma sintering Mechanical properties Electrical performance

Optimization of mechanical properties and corrosion resistance of Zn-0.4Mn-0.8Li alloy using the hot rolling process

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第14期145卷 136-147页

作者： Xinxin Yang Peng Du Kun Li Weizong Bao Tao Xiang Jie Chen Xingjun Liu Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China state Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Zinc-based degradable metals are considered one of the most promising biodegradable materials due to their moderate corrosion rate,excellent mechanical properties,and good *** this work,biodegradable Zn-0.4Mn-0.8Li alloy was fabricated and rolled in multiple passes at different tem *** the hot rolling temperature increases,the grain size of Zn-0.4Mn-0.8Li alloy was found to increase ***,a multi-scale structure with the coexistence of coarse grains and fine grains was *** results demonstrated that the mechanical strength and corrosion resistance were improved by increasing the rolled *** was observed that Zn-0.4Mn-0.8Li alloy with a total reduction of 90%after hot rolling at 325℃ exhibited excellent mechanical and corrosion *** cooperation of multi-scale microstructure and twinning was found to improve the strength and guarantee the duc-tility of Zn-0.4Mn-0.8Li alloy significantly so that the 325℃ hot-rolled Zn-0.4Mn-0.8Li alloy has optimal comprehensive ***,yield strength,ultimate tensile strength,and elongation were found to be 449.7±5.3 MPa,505.1±6.5 MPa,and 40.5%±7.5%,***,Zn-0.4Mn-0.8Li al-loy via 325℃ hot-rolled processes also exhibited excellent corrosion *** corrosion current density and corrosion potential were found to be 8.8×10-5 mA cm^(-2)and−0.929 V,*** preliminary study indicates that Zn-0.4Mn-0.8Li alloy is a promising candidate material for medical de-vice applications.

关键词： Zn-based degradable metal Hot rolling Mechanical property Corrosion behavior

Light-responsive and corrosion-resistant gas valve with non-thermal effective liquid-gating positional flow control

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2021年第7期10卷 1155-1163页

作者： Baiyi Chen Rongrong Zhang Yaqi Hou Jian Zhang Shiyan Chen Yuhang Han Xinyu Chen Xu Hou state Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Collaborative Innovation Centre of Chemistry for Energy Materials Xiamen UniversityXiamen 361005China Department of Physics Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional Materials ResearchJiujiang Research InstituteCollege of Physical Science and TechnologyXiamen UniversityXiamen 361005China Tan Kah Kee Innovation Laboratory Xiamen 361102China

Safe and precise control of gas flow is one of the key factors to many physical and chemical processes,such as degassing,natural gas transportation,and gas *** practical application,it is essential for the gas-involved physicochemical process to keep everything under control and safe,which significantly relies on the controllability,safety,and stability of their *** we show a light-responsive and corrosion-resistant gas valve with non-thermal effective liquid-gating positional flow control under a constant pressure by incorporating dynamic gating liquid with light responsiveness of solid porous *** experimental and theoretical analysis reveal that the photoisomerization of azobenzene-based molecular photoswitches on the porous substrate enabled the gas valve to possess a light-responsive and reversible variation of substantial critical pressure of non-thermal effective gas flow ***,the chemically inert gating liquid prevented the solid substrate from corrosion and,by combining with the high spatiotemporal resolution of light,the gas valve realizes a precisely positional open and close under a steady-state *** application demonstrations in our results show the potentials of the new gas valve for bringing opportunities to many applications,such as gas-involved reaction control in microfluidics,soft actuators,and beyond.

关键词： corrosion flow liquid