检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Gao, Zecui Zhang, Tengfei Wang, Qimin Mayrhofer, Paul Heinz School of Electromechanical Engineering Guangdong University of Technology Guangzhou510006 China Institute of Materials Science and Technology Technische Universität Wien Getreidemarkt 9 Vienna1060 Austria Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of Education Anhui University of Technology Anhui Maanshan243000 China

The performance of electrochemical capacitors strongly depends on their accessible surface area, chemical stability, and electrical conductivity. Simple columnar and zig-zag γ-Mo2N thin-film electrodes were prepared by magnetron sputtering. The latter is obtained by glancing angle deposition (GLAD), which is known for open porous structures due to the ballistic shadowing effect. As intended, the zig-zag structured γ-Mo2N electrode presents an outstanding area capacitance of 248 mF/cm2 at a scan speed of 50 mV/s, which is 4 times higher than that of the simple columnar one. Both of them exhibit excellent cycling stability of 95% over 20,000 cycles (at 200 mV/s). The symmetrical solid-state supercapacitor prepared with the zig-zag structured γ-Mo2N thin film delivers an excellent power density of 107.1 W/cm3 at 33.8 mWh/cm3, and its volumetric capacitance is ~3.5 times higher than the simple columnar structured γ-Mo2N device. Bending tests of such solid-state γ-Mo2N supercapacitors proved their mechanical flexibility to a bending angel of even 107°. Based on these studies we can conclude that the highly porous zig-zag structured γ-Mo2N-based electrodes prepared by GLAD combine outstanding electrochemical energy storage capabilities with excellent mechanical flexibility. © 2022, The Authors. All rights reserved.

关键词： Supercapacitor

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Synthesis of Ti_2CT_x MXene as electrode materials for symmetric supercapacitor with capable volumetric capacitance

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Journal of Energy Chemistry 2019年第4期28卷 11-18页

作者： Kai Zhu Yuming Jin Fei Du Shuang Gao Zhongmin Gao Xing Meng Gang Chen Yingjin Wei Yu Gao Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Key Laboratory of Physics and Technology for Advanced Batteries Ministry of Education College of Physics Jilin University State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin University State Key Laboratory of Superhard Materials Jilin University

Two-dimensional(2D)metal carbides,MXene,present the promising application for the energy storage *** the MXene family,Ti_2CT_xas the lightest material,shows its unique electrochemical ***,Ti_2CT_xis synthesized by selective etching Al layer from the Ti_2Al *** the optimized HF treating condition,Ti_2CT_xdisplays high volumetric capacitance and remarkable rate ***,the Ti_2CT_x//Ti_2CT_xsymmetric supercapacitor is designed and assembled,which presents capable capacitance,outstanding rate performance and excellent cycling *** remarkable electrochemical performance is attributed to its 2D structure and high electronic *** work demonstrates the potential application of the Ti_2CT_xfor the supercapacitors and provides a template to design highperformance supercapacitors with 2D electrode materials.

关键词： Supercapacitor Two-dimensional material Ti2CTx MXene

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Enabling Large-Scale and High-Precision Fluid Simulations on Near-Term Quantum Computers

SSRN

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SSRN 2024年

作者： Chen, Zhao-Yun Ma, Teng-Yang Ye, Chuang-Chao Xu, Liang Bai, Wen Zhou, Lei Tan, Ming-Yang Zhuang, Xi-Ning Xu, Xiao-Fan Wang, Yun-Jie Sun, Tai-Ping Chen, Yong Du, Lei Guo, Liang-Liang Zhang, Hai-Feng Tao, Hao-Ran Wang, Tian-Le Yang, Xiao-Yan Zhao, Ze-An Wang, Peng Zhang, Sheng Zhao, Ren-Ze Zhang, Chi Jia, Zhi-Long Kong, Wei-Cheng Dou, Meng-Han Wang, Jun-Chao Liu, Huan-Yu Xue, Cheng Zhang, Peng-Jun-Yi Huang, Sheng-Hong Duan, Peng Wu, Yu-Chun Guo, Guo-Ping Institute of Artificial Intelligence Hefei Comprehensive National Science Center Hefei230088 China Co. Ltd. Hefei230088 China China Academy of Aerospace Aerodynamics Beijing100074 China Chinese Aeronautical Establishment Beijing100012 China Xi’an Aeronautics Computing Technique Research Institute AVIC Xi’an710000 China Department of Modern Mechanics University of Science and Technology of China Hefei230026 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China Laboratory for Advanced Computing and Intelligence Engineering Zhengzhou450000 China CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China Hefei230026 China

Quantum computational fluid dynamics (QCFD) offers a promising alternative to classical computational fluid dynamics (CFD) by leveraging quantum algorithms for higher efficiency. This paper introduces a comprehensive QCFD method, including an iterative method ``Iterative-QLS'' that suppresses error in quantum linear solver, and subspace method to scale the solution to larger size. We implement our method on a superconducting quantum computer, demonstrating successful simulations of steady Poiseuille flow and unsteady acoustic wave propagation. The Poiseuille flow simulation achieved a relative error of less than 0.2%, and the unsteady acoustic wave simulation solved a 5043-dimension matrix. We emphasize the utilization of quantum-classical hybrid approach in applications of near-term quantum computers. By adapting to quantum hardware constraints and offering scalable solutions for large-scale CFD problems, our method paves the way for practical applications of near-term quantum computers in computational science. © 2024, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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Uniaxial Deformation Behaviors and Mechanism of Ti-6al-4v Alloy with Bi-Oriented Grains

SSRN

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SSRN 2023年

作者： Han, Shuaijie Shao, Chenwei Zhao, Shuo Lu, Yang Liu, Hanzhong Wang, Zhiqin Qu, Zhan Duan, Qiqiang Zhang, Zhenjun Zhang, Zhefeng School of Materials Science and Engineering Northeastern University Shenyang110819 China Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process Shenyang Aerospace University Shenyang110136 China Dresden University of Technology Germany Shi-changxu Innovation Center for Advanced Materials China

It is of great importance to investigate the deformation and damage mechanisms of polycrystalline materials with soft crystal orientations, considering the soft grains are usually the fatigue crack initiation sites. In this study, a Ti-6Al-4V alloy fully consisted of and α (soft) grains was prepared and its uniaxial deformation behavior was investigated. Interestingly, no significant asymmetry on the tension-compression yield strength was found in this alloy with bi-grain orientations, though mechanical asymmetry was generally found in the traditional Ti alloys with strong texture. After high temperature solution treatment, the preferred bi-orientations were retained and the asymmetry degree of yield strength did not change, showing an excellent stability in texture and mechanical performance. Deformation mechanisms during tension and compression were studied and discussed. This work provides a new understanding on the deformation and damage mechanisms in the grains with soft crystal orientations, and may guide the microstructural design of Ti alloy for pursuing high mechanical and fatigue performances in the future. © 2023, The Authors. All rights reserved.

关键词： Aluminum alloys

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Grain and stoichiometry engineering for ultra-sensitive perovskite X-ray detectors

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Journal of Materials Chemistry A 2021年第45期9卷 25603-25610页

作者： Yingrui Xiao Shanshan Jia Nuo Bu Nan Li Yucheng Liu Ming Liu Zhou Yang Shengzhong (Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China School of Microelectronics State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian China

High sensitivity and a low detection limit are key figures-of-merit for high-energy radiation detectors. Previously, it was found that hot pressing is an effective method to fabricate large, thick compact pellets for highly sensitive X-ray detectors. Herein, we further studied the formation mechanism of a compact pellet and the impacts of the crystal size and stoichiometry of the perovskite pellet on the X-ray detection performance, which has rarely been investigated. It has been found that both heat and pressure are necessary for the formation of a compact pellet and the stoichiometry should be well controlled during the heat treatment. The impacts of temperature are two-fold: facilitating the growth of crystal grains and softening the grains. Pressure will induce the softened grains to form a compact pellet. The crystal grain size will be enlarged with the increase of temperature; however, as the temperature exceeds 150 °C, the atomic ratio of I to Pb will decrease with temperature, which will weaken the X-ray response of the pellet. Furthermore, by adjusting the I to Pb ratio by adding more CH₃NH₃I (MAI), the X-ray response will be improved, achieving a high sensitivity of 4.2 × 10⁵ μC Gy_air⁻¹ cm⁻² at a field of 6.58 V mm⁻¹. These findings provide insights into the use of grain engineering and composition engineering to design effective materials for high-performance X-ray detection.

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Antisymmetric planar Hall effect in rutile oxide films induced by the Lorentz force

arXiv

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arXiv 2023年

作者： Cui, Yongwei Li, Zhaoqing Chen, Haoran Wu, Yunzhuo Chen, Yue Pei, Ke Wu, Tong Xie, Nian Che, Renchao Qiu, Xuepeng Liu, Yi Yuan, Zhe Wu, Yizheng Department of Physics State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Interdisciplinary Center for Theoretical Physics and Information Sciences Fudan University Shanghai200433 China Center for Advanced Quantum Studies Department of Physics Beijing Normal University Beijing100875 China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials Academy for Engineering & Technology Fudan University Shanghai200438 China Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University Shanghai200092 China Zhejiang Laboratory Hangzhou311100 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Shanghai Key Laboratory of Metasurfaces for Light Manipulation Fudan University Shanghai200433 China

The conventional Hall effect is linearly proportional to the field component or magnetization component perpendicular to a film [1]. Despite the increasing theoretical proposals on the Hall effect to the in-plane field or magnetization in various special systems induced by the Berry curvature [2-8], such an unconventional Hall effect has only been experimentally reported in Weyl semimetals and in a heterodimensional superlattice [9-12]. Here, we report an unambiguous experimental observation of the antisymmetric planar Hall effect (APHE) with respect to the in-plane magnetic field in centrosymmetric rutile RuO2 and IrO2 single-crystal films. The measured Hall resistivity is found to be linearly proportional to the component of the applied in-plane magnetic field along a particular crystal axis and to be independent of the current direction or temperature. Both the experimental observations and theoretical calculations confirm that the APHE in rutile oxide films is induced by the Lorentz force. Our findings can be generalized to ferromagnetic materials for the discovery of anomalous Hall effects and quantum anomalous Hall effects induced by in-plane magnetization. In addition to significantly expanding knowledge of the Hall effect, this work opens the door to explore new members in the Hall effect family. Copyright © 2023, The Authors. All rights reserved.

关键词： Crystal symmetry

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Influence of Hydrogen Ingress and Capture on the Mechanical Properties of Spray Formed 2195 Aluminum Alloy

SSRN

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SSRN 2024年

作者： Yang, Xiao-Xu Jiang, Yun-Ze Li, Guo-Ai Shen, Xiao-Yu Lai, Xiao-Ming Wang, Xiao-Ya Jiang, Jian-Tang Zhen, Liang School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China Jiangsu Haoran Spray Forming Alloy Co. Ltd. Zhenjiang212000 China Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Engineering Research Center of Advanced Aluminum Alloys and Application Beijing100095 China Beijing Spacecrafts Co. Ltd. Beijing100094 China Shenzhen518055 China National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology Harbin150001 China

The current research has focused on the hydrogen capturing and its impact on the mechanical properties of spray-formed 2195 (SF2195) aluminum alloy. Microstructure characterization, thermal desorption spectra (TDS) and hydrogen trapping of characteristic microstructure, are used to investigate the generation, migration and trapping of hydrogen. The retention of moisture in the carrier gas is believed to induce high concentration of hydrogen and the amorphous Al2O3 layer within the SF2195 billet, and the local retention of carrier gas brings about pores with the Al2O3 layer on the inner wall. High concentration of hydrogen is captured in the hot-rolled alloy while around 60% of the hydrogen can be eliminated during the solution-quenching. Particles of T1 phase trap large quantity of hydrogen and the high-density dislocations developed from the pre-stretch promote the migration of hydrogen towards dispersoids and precipitates. The presence of hydrogen and Al2O3 layers contribute to the reduced plasticity of SF2195 alloy. The spreading of flattened pores can induce intensified hydrogen damage effect in local regions and thus contribute to the unusually decreased ductility along the thickness direction in the T8 aged alloy. © 2024, The Authors. All rights reserved.

关键词： Hydrogen

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Ultrasensitive self-driven photoelectrochemical aptasensor for lincomycin detection based on oxygen vacancy-tunable BiOBr nanosheet coupled with dual-function of N-doped Ti3C2 quantum dots

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Biosensors and Bioelectronics: X 2022年 12卷

作者： Wei, Meng Du, Xiaojiao Zhang, Yude Shan, Xueling Wang, Wenchang Chen, Yanli Jiang, Ding Xu, Fangmin Shiigi, Hiroshi Chen, Zhidong Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical Engineering Changzhou University Jiangsu Changzhou213164 China Oakland International Associated Laboratory School of Photoelectric Engineering Changzhou Institute of Technology Jiangsu Changzhou213032 China Jiangsu Key Laboratory of Materials Surface Science and Technology Changzhou University Jiangsu Changzhou213164 China Institute of Forensic Science Public Security Bureau of Jiangyin Wuxi214431 China Department of Applied Chemistry Osaka Prefecture University 1-2 Gakuen Naka Sakai Osaka599-8570 Japan

A high-performance self-driven photoelectrochemical (PEC) platform was designed based on 0D N-doped Ti3C2 quantum dots/oxygen vacancies (OVs) engineered 2D BiOBr nanosheets (N-doped Ti3C2 QDs/BiOBr) nanocomposites for sensitive detection of lincomycin (Lin). The synergistic interplay between 0D N-doped Ti3C2 QDs and 2D BiOBr can generate the fascinating interface of chemical/electronic coupling to further boost the PEC activity, including efficient charge transfer, extended the light absorption and increased carrier density. Experimental results demonstrated that the PEC response of the prepared OV-riched N-doped Ti3C2 QDs/BiOBr van der Waals (vdW) heterostructures were 9-folds stronger than that of OV-deficient BiOBr. On the basis of the such excellent PEC performance, an ultrasensitive self-driven PEC aptasensor was developed with the assistance of Lin aptamer. The proposed sensor exhibited a wide linear response (1.0 × 10−14 mol/L ∼ 1.0 × 10−8 mol/L), a low detection limit (3.57 × 10−15 mol/L, S/N = 3), excellent selectivity and good reproducibility, which provided a promising tool to detect Lin in real samples. This work not only offered a versatile protocol for a wide variety of PEC detection, but also paved the way for the development of more efficient PEC biosensor. © 2022 The Authors

关键词： Bismuth compounds

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Absence of Altermagnetic Spin Splitting Character in Rutile Oxide RuO2

arXiv

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arXiv 2024年

作者： Liu, Jiayu Zhan, Jie Li, Tongrui Liu, Jishan Cheng, Shufan Shi, Yuming Deng, Liwei Zhang, Meng Li, Chihao Ding, Jianyang Jiang, Qi Ye, Mao Liu, Zhengtai Jiang, Zhicheng Wang, Siyu Li, Qian Xie, Yanwu Wang, Yilin Qiao, Shan Wen, Jinsheng Sun, Yan Shen, Dawei Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201210 China University of Chinese Academy of Sciences Beijing100049 China School of Materials Science and Engineering University of Science and Technology of China Shenyang110016 China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China National Synchrotron Radiation Laboratory School of Nuclear Science and Technology University of Science and Technology of China Hefei230026 China National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China National Laboratory of Solid State Microstructures Department of Physics Nanjing University Nanjing210093 China School of Physics Zhejiang University Hangzhou310027 China Laboratory of Advanced Materials State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200438 China Center for Transformative Science ShanghaiTech University Shanghai201210 China School of Emerging Technology University of Science and Technology of China Hefei230026 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

Rutile RuO2 has been posited as a potential d-wave altermagnetism candidate, with a predicted significant spin splitting up to 1.4 eV. Despite accumulating theoretical predictions and transport measurements, direct spectroscopic observation of spin splitting has remained elusive. Here, we employ spin- and angle-resolved photoemission spectroscopy to investigate the band structures and spin polarization of thin-film and single-crystal RuO2. Contrary to expectations of altermagnetism, our analysis indicates that RuO2’s electronic structure aligns with those predicted under nonmagnetic conditions, exhibiting no evidence of the hypothesized spin splitting. Additionally, we observe significant in-plane spin polarization of the low-lying bulk bands, which is antisymmetric about the high-symmetry plane and contrary to the d-wave spin texture due to time-reversal symmetry breaking in altermagnetism. These findings definitively challenge the altermagnetic order previously proposed for rutile RuO2, prompting a reevaluation of its magnetic properties. © 2024, CC BY.

关键词： Single crystals

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Ideal noncrystals: a possible new class of ordered matter without apparent symmetry breaking

arXiv

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arXiv 2024年

作者： Fan, Xinyu Xu, Ding Zhang, Jianhua Hu, Hao Tan, Peng Xu, Ning Tanaka, Hajime Tong, Hua Department of Physics University of Science and Technology of China Hefei230026 China School of Physics and Optoelectronic Engineering Anhui University Hefei230601 China State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Hefei National Research Center for Physical Sciences the Microscale and Chinese Academic of Sciences Key Laboratory of Microscale Magnetic Resonance University of Science and Technology of China Hefei230026 China Department of Fundamental Engineering Institute of Industrial Science University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo153-8505 Japan Research Center for Advanced Science and Technology University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo153-8904 Japan

Order and disorder constitute two fundamental and opposite themes in condensed matter physics and materials science. Crystals are considered the epitome of order, characterised by long-range translational order. The discovery of quasicrystals, which exhibit rotational symmetries forbidden in crystals and lack periodicity, led to a paradigm shift in solid-state physics. Moving one step forward, it is intriguing to ask whether ordered matter can exist without apparent symmetry breaking. The same question arises considering how ordered amorphous (noncrystalline) solids can be structured. Here, we present the discovery of ideal noncrystals in two dimensions, which are disordered in the conventional sense, lacking Bragg peaks, but exhibit high orderliness based on the steric order, i.e., they are ideally packed. A path-integral-like scheme reveals the underlying long-range structural correlation. We find that these ideal noncrystals are characterised by phononic vibrational modes following the Debye law, fully affine elastic responses, and suppressed density fluctuations at longer wavelengths, reminiscent of hyperuniformity — all characteristics typically associated with crystals. Therefore, ideal noncrystals represent a peculiar form of matter with a mixed nature—noncrystalline yet possessing crystal-like properties. Notably, these states are found to be thermodynamically favourable, indicating them as a possible new class of ordered matter without apparent symmetry breaking. Our findings significantly broaden the conceptualization of ordered states of matter and may contribute to a deeper understanding of entropy-driven ordering, particularly in generic amorphous materials. © 2024, CC BY.

关键词： Amorphous materials

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