检索结果-内蒙古大学图书馆

Applied Surface Science 2021年 560卷

作者： Guo, Zengsheng Wu, Hao Tang, Tao Li, Ming Wen, Jianfeng Li, Xinyu College of Science & Ministry-province Jointly-constructed Cultivation Base for State Key Laboratory of Processing for Mom-ferrous Metal and Featured Materials & Key Lab. of Nonferrous Materials and New Processing Technology Guilin University of Technology Guilin541004 China

Research Progress in Preparation technology and Strengthening and Stabilizing Methods of Nanostructured Metal materials

学校读者我要写书评

暂无评论

Cailiao Daobao/materials Reports 2023年 37卷

作者： Zhang, Wei Yang, Xu Chen, Xiaotong Ren, Junqiang Lu, Xuefeng State Key Laboratory for Advanced Processing and Reuse of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China

In recent years,with the rapid and stable development of the national economy,science and technology have become the first productive force in production and manufacturing. In the field of materials,nanostructured metal materials exhibit excellent comprehensive properties and have been used in industrial production and manufacturing widely,making it become a research hotspot in the field of new materials. Based on the latest research achievements,this article summarizes the research status and development prospects of the preparation process,strengthening and stabilization methods and mechanisms of nanostructured metal materials. Firstly,the preparation processes of nanostructured metal materials are introduced,and the preparation processes,principles,advantages and disadvantages of different processes are described and compared. Secondly,based on the current research status,the research progress of various strengthening and stabilizing methods of nanostructured metal materials is introduced,and the deformation mechanisms and microscopic mechanisms of various strengthening and stabilizing methods are explored and analyzed. Finally,based on the latest research progress,the existing problems in the preparation,strengthening and stabilization methods,and industrial production applications of nanostructured metal materials are summarized,we also prospected the future development direction of nanostructured metal materials and their broad applications in industrial production and manufacturing fields. © 2023 Cailiao Daobaoshe/ materials Review. All rights reserved.

关键词： Strengthening (metal)

Microstructure Evolution and Mechanical Behavior of Cu-7ni-7al-4fe-2mn Alloy Via a Quenching-Aging Heat Treatment

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Jiang, Hao Zhang, Xuebin Yang, Ran Zhou, Yanjun Huang, Shuhui Yu, Yan Yang, Wenhao Yu, Bo Liu, Dongdong Jiang, Kaixuan Huang, Kuan School of Materials Science and Engineering Henan University of Science and Technology Luoyang471023 China Provincial and Ministeral Co-construction Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing Technology Luoyang471023 China Henan Key Laboratory of Advanced Nonferrous Materials Luoyang471023 China School of Medical Technology and Engineering Henan University of Science and Technology Luoyang471023 China GRIMAT Engineering Institute Co. Ltd. Beijing101407 China Luoyang Ship Material Research Institute Luoyang471023 China

The effects of solution and aging treatment on the microstructure and mechanical properties of Cu-7Ni-7Al-4Fe-2Mn alloy were studied by means of OM, SEM, TEM and an electronic tensile testing machine. The results show that the microstructure of the as-cast alloy is mainly composed of an α-Cu matrix, Fe3Al particles and NiAl phase distributed at the grain boundaries. After solution treatment, the distribution of bean-shaped Fe3Al particles in the microstructure of the alloy is more uniform than that of the as-cast state, and the larger square Fe3Al phase is redissolved and disappears. During the aging process, the NiAl phase is continuously precipitated in the grains. The strength and hardness of the alloy first increase and then decrease with the extension of the aging time. After aging treatment at 500 °C×6 h, the hardness of the alloy is 231.4 HV, and the tensile strength is 538.5 MPa. The hardness is 78.8% higher than that of the as-cast state, and the tensile strength is 41.9% higher than that of the as-cast state. © 2023, The Authors. All rights reserved.

关键词： Microstructure

Synthesis of Cubic Boron Nitride by Mechanical Activation with Hexagonal Boron Nitride

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Li, Wensheng Cheng, Bo Zhang, Tao Zhang, Xinjian Shao, Lei Wang, Yu Seniuts, Uladzimir Belotsrkovsky, Marat School of Materials Science and Engineering Shandong University of Science and Technology Shandong Qingdao266590 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal Lanzhou University of Technology Gansu Lanzhou730050 China The Joint Institute of Mechanical Engineering National Academy of Sciences of Belarus Minsk Minsk220072 Belarus

Cubic boron nitride (cBN) is widely used in precision finishing, grinding and polishing due to its ultra-high hardness. In this study, a new cBN synthesis method is proposed via mechanical activation with hexagonal boron nitride (hBN) as the raw materials. Effect of the rotation speed and activation time on the transform rate of hBN to cBN and microstructure such as morphology, phase structure and grain size were investigated, as well as the relationship between of the rotate speed and energy of mechanical activation was analyzed. Results showed that the phase transformation from hBN to cBN is realized at 1200 rpm under room temperature and pressure, which is consistent with the results of the energy of mechanical activation calculation. Rotate speed is the dominant factor compared with the processes time, and the average pressure of mechanical activation at high speed (1200 rpm) is much larger than the shear modulus of hBN (6.28 G > 3 G), which is enough to destroy its structure. The content of cBN increases with milling time, and reached 15.6 vol.% after 60 min. The grain size of milled hexagonal BN gradually decreases and the GI value increases with milling time. Boron oxide produced during mechanical activation, which is unfavorable for the synthesis of cubic boron nitride, prolonging ball milling time under vacuum can effectively reduce or even avoid it. © 2023, The Authors. All rights reserved.

关键词： Phase transitions

Multi-Metal Substituted Fe-Based Prussian Blue as High-Capacity Cathode Material for Potassium Ion Batteries

学校读者我要写书评

暂无评论

SSRN 2024年

作者： Yang, Shujie Feng, Xi Min, Xin Ma, Bin Liu, Yangai Mi, Ruiyu Wu, Xiaowen Wang, Wei Huang, Zhaohui Fang, Minghao China Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Material Sciences and Technology China University of Geosciences Beijing100083 China Qinghai Provincial Key Laboratory of New Light Alloys Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming Qinghai University Xining810016 China State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing100083 China

Fe-based Prussian blue (FePB) has been widely studied as cathode materials of potassium ion batteries due to its three-dimensional open framework structure and large ion migration channels. In this study, the multi-metal (Co2+, Cu2+, Ni2+, Mn2+) doping on the rate and cycling properties of FePB were investigated. MnCoNiFePB cathode material shows better electrochemical performance, with the initial discharge capacity of 91.3 and 75.4 mAh g-1 (capacity retention is 56.7% after 100 cycles) at 20 and 100 mA g-1, respectively. These results inspire new ideas for the development and application of potassium ion battery electrode materials. © 2024, The Authors. All rights reserved.

关键词： Cathodes

Fabrication plate-like BaBi_(4)Ti_(4)O_(15) single-crystalline particles by the molten salt synthesis method

学校读者我要写书评

暂无评论

Journal of advanced Dielectrics 2023年第2期13卷 6-12页

作者： Xiaoying Feng Bei Xu Xiaoyu Xu Penghui Chen Zhuozhao Wu Duo Teng Jie Xu Feng Gao State Key Laboratory of Solidification Processing MIIT Key Laboratory of Radiation Detection Materials and DevicesUSI Institute of Intelligence Materials and Structure NPU-QMUL Joint Research Institute of Advanced Materials and Structure School of Materials Science and EngineeringNorthwestern Polytechnical University Xi’an 710072P.R.China Queen Mary University of London Engineering School Northwestern Polytechnical University Xi’an 710072P.R.China School of Marine Science and Technology Northwestern Polytechnical University Xi’an 710072P.R.China Guangzhou Newlife New Material Co. LtdGuangzhou 511356P.R.China

Plate-like single-crystalline BaBi_(4)Ti_(4)O_(15) particles were synthesized by the molten salt synthesis(MSS)*** effects of sintering temperature,holding time,and NaCl-KCl molten salt content on the phase structure and morphology of plate-like BaBi_(4)-Ti_(4)O_(15) particles were *** results show that plate-like BaBi_(4)Ti_(4)O_(15) particles can be synthesized when the sintering temperature is above 800°*** size of particles increases with increasing sintering temperature and molten salt *** anisotropic plate-like BaBi_(4)Ti_(4)O_(15) particles with diameter≥10μm and thickness of~0.3μm can be obtained under the optimum process *** crystal structure of BaBi_(4)Ti_(4)O_(15) was determined as A21am by TEM,which should be attributed to the Bi3+and Ba2+diffusing into[TiO6]octahedrons.

关键词： Molten salt synthesis method calcining condition salts content microplatelets anisotropy

Chiral NIR-Ⅱ fluorescent Ag_(2)S quantum dots with stereospecific biological interactions and tumor accumulation behaviors

学校读者我要写书评

暂无评论

Science Bulletin 2022年第12期67卷 1274-1283,M0004页

作者： Shaohua Qu Qian Jia Zheng Li Zhongliang Wang Li Shang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical University(NPU)Xi’an 710072China Lab of Molecular Imaging and Translational Medicine(MITM) Engineering Research Center of Molecular&NeuroimagingMinistry of EducationSchool of Life Science and TechnologyXidian UniversityXi’an 710126China Academy of Advanced Interdisciplinary Research Xidian UniversityXi’an 710071China

Near-infrared Ⅱ(NIR-Ⅱ)fluorescent nanoprobes hold great potential for biomedical *** the relationship between surface properties of NIR-Ⅱ nanoprobes and their biological behaviors is particularly important for future probe design and their performance *** the rapid development of NIR-Ⅱ nanoprobes,the distinct role of surface chirality on their biological fates has rarely been ***,chiral NIR-Ⅱ fluorescent Ag_(2)S quantum dots(QDs)are synthesized to investigate the relationship between their chirality and biological functions at both in vitro and in vivo levels.D-/L-Ag_(2)S QDs exhibit significant differences on their interactions with serum proteins,which further affect the cellular *** a result,D-Ag_(2)S QDs can be internalized with higher efficiency(over 2-fold)than that of L-Ag_(2)S ***,in vivo studies reveal that the chirality determines the primary localization of these chiral QDs,where a more efficient renal elimination of D-Ag_(2)S QDs was observed than that of L-Ag_(2)S ***,D-Ag_(2)S QDs show preferential accumulation in tumor region than that of L-Ag_(2)S QDs in orthotopic kidney tumor model,which points out a new avenue of enhancing targeting capabilities of nanoprobes by engineering their surface chirality.

关键词： Chirality NIR-Ⅱprobes Ag_(2)S quantum dots Protein corona Tumor targeting

Sulfate Resistance and Microstructure of Metakaolin Geopolymer Reinforced by Cellulose Nanofiber and Wollastonite

学校读者我要写书评

暂无评论

SSRN 2022年

作者： Luo, Ren Liu, Huai Duan, Ping Ye, Jiayuan Chen, Wei Zhang, Zuhua Wang, Aiguo Faculty of Materials Science and Chemistry Key Laboratory of Geological Survey and Evaluation of Ministry of Education China University of Geosciences Wuhan430074 China GuangXi Key Laboratory of New Energy and Building Energy Saving Guilin University of Technology Guangxi541004 China Key Laboratory of Road Structure and Materials of Ministry of Transport Chang’ an University Xi’an710064 China Key Laboratory of Advanced Building Materials of Anhui Province Anhui Jianzhu University Hefei230022 China State Key Laboratory of Green Building Materials China Building Materials Academy Beijing100024 China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha410082 China

This work aims to obtain high-purity cellulose nanofiber (CNF) from waste bamboo powder through alkali treatment, bleaching treatment and acid hydrolysis. The purification effect and environmental impact of CNF were compared by different bleaching methods. The optimal conditions for CNF purification were determined. The geopolymer reinforced by natural fiber is prepared by combining wollastonite (WS) and CNF. The deterioration mechanism of geopolymer reinforced by natural fiber exposed to sulfate environment was revealed by employing XRD, SEM and MIP. The influence of extreme sulfate environment on mechanical properties and microstructure was explored. The analysis results of microstructure, mass loss rate and mechanical properties were also combined to evaluate the sulfate resistance. The outcomes show that the bleaching method of H2O2 can effectively remove impurities and enhance the purification effect of CNF. The flexural and compressive strength of geopolymer reinforced by natural fiber are significantly improved. The deterioration of geopolymer is related to the concentration of Na2SO4 and the immersion time. The degradation mechanism is attributed to the incomplete geopolymerization and the destruction of the pore structure due to sulfate attack exposure. The deterioration processes of geopolymer can be slowed down by introducing WS and CNF. It perfects the sulfate resistance of the matrix from the structural aspect. © 2022, The Authors. All rights reserved.

关键词： Nanofibers

Electronic and magnetic excitations in La3Ni2O7 (vol 15, 9597, 2024)

学校读者我要写书评

暂无评论

NATURE COMMUNICATIONS 2024年第1期15卷 9597页

作者： Chen, Xiaoyang Choi, Jaewon Jiang, Zhicheng Mei, Jiong Jiang, Kun Li, Jie Agrestini, Stefano Garcia-Fernandez, Mirian Sun, Hualei Huang, Xing Shen, Dawei Wang, Meng Hu, Jiangping Lu, Yi Zhou, Ke-Jin Feng, Donglai State Key Laboratory of Surface Physics Department of Physics and Advanced Materials Laboratory Fudan University Shanghai China Diamond Light Source Didcot UK National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology University of Science and Technology of China Hefei China Collaborative Innovation Center of Advanced Microstructures Nanjing China New Cornerstone Science Laboratory University of Science and Technology of China Hefei China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing China School of Physical Sciences University of Chinese Academy of Sciences Beijing China New Cornerstone Science Laboratory Beijing China National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing China School of Science Sun Yat-Sen University Shenzhen Guangdong China Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of Physics Sun Yat-Sen University Guangzhou Guangdong China

High-temperature superconductivity was discovered in the pressurized nickelate La3Ni2O7 which has a unique bilayer structure and mixed valence state of nickel. The properties at ambient pressure contain crucial information of the fundamental interactions and bosons mediating superconducting pairing. Here, using X-ray absorption spectroscopy and resonant inelastic X-ray scattering, we identified that Ni 3dx2−y2, Ni 3dz2, and ligand oxygen 2p orbitals dominate the low-energy physics with a small charge-transfer energy. Well-defined optical-like magnetic excitations soften into quasi-static spin-density-wave ordering, evidencing the strong electronic correlation and rich magnetic properties. Based on an effective Heisenberg spin model, we extract a much stronger inter-layer effective magnetic superexchange than the intra-layer ones and propose two viable magnetic structures. Our findings emphasize that the Ni 3dz2 orbital bonding within the bilayer induces novel electronic and magnetic excitations, setting the stage for further exploration of La3Ni2O7 *** was recently found that a certain nickelate compound, La3Ni2O7, at moderately high pressures has a superconducting phase that persists to above liquid nitrogen temperatures. Here, by studying the parent phase at ambient pressure, Chen et al uncover rich magnetic properties and show the vital role of the strong bonding of the inter-layer Ni orbitals in the magnetic and electronic excitations.

关键词：

Three-Dimensional Interconnected Graphene Architecture Reinforced Epoxy Composite with Superior Mechanical and Tribological Properties

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Min, Chunying Sun, Zhaolong Li, Qiuying Yu, Hang Xu, Zhiwei Liang, Hongyu Research School of Polymeric Materials School of Materials Science & Engineering Jiangsu University Jiangsu Zhenjiang212013 China State Key Laboratory of Tribology Tsinghua University Beijing100000 China National United Engineering Laboratory for Advanced Bearing Tribology Henan University of Science and Technology Luoyang471023 China School of Textile Science and Engineering Tiangong University Tianjin300387 China Institute of Advanced Manufacturing and Modern Equipment Technology School of Mechanical Engineering Jiangsu University Jiangsu Zhenjiang212013 China

The tribological performances reinforcement is limited by insufficient dispersion and random orientation of nanofillers in composites. In light of above difficulties, we designed a three-dimensional interconnected graphene architecture (3DGA) wherein reinforcement is pre-formed in three dimensions. In the 3DGA reinforced epoxy (3DGA/EP) composite fabricated by resin transfer molding combined with in-situ ultrasonic method, 3DGA assembling from graphene sheets was in good dispersion and distribution state, which resulted in exceptional thermal stability, mechanical and tribological properties for epoxy composites. Hence, 3DGA/EP composites exhibited glass transition temperature, tensile strength and wear rate increased by 27.1 °C, 41.1% and 38.1% respectively than GO/EP composites in direct solution blending. In this work, we utilized 3DGA instead of two-dimensional graphene sheets as the ordered reinforcement of composites, providing a promising strategy to achieve high-performance polymer-based composites with superior mechanical and tribological properties. © 2023, The Authors. All rights reserved.

关键词： Epoxy composites