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SSRN 2024年

作者： Zhang, Qian Liu, Qipeng Gao, Yufei Xiong, Mei Ying, Pan Cheng, Xiaozhe Li, Qisong Wang, Ziqi Mu, Yunchao Wang, Zhixin Huang, Quan College of Material and Chemical Engineering Zhongyuan University of Technology Zhengzhou450007 China Center for High Pressure Science State Key Laboratory of Metastable Materials Science and Technology Yanshan University Hebei Qinhuangdao066004 China School of Mechanical Engineering Tianjin University of Technology and Education Tianjin300222 China National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Engineering Research Center of Materials Behavior and Design Ministry of Education Nanjing University of Science and Technology Nanjing210094 China

Novel semiconductor material with both high strength and ductility is urgently needed to meet the demands of increasing complex applications for electronic components. However, overcoming the inherent trade-off between strength and ductility has remained a longstanding challenge in materials science research. Herein, we proposed a three-dimensional carbon allotrope, oc-C24 with pure sp2 hybridization. This structure comprises arrays chiral chains in an "8"-shape helix configuration, in between the C-chains which interlinked by the oriented ethylene with a planar π-conjugation. The distinctive structural unit imbues oc-C24 with remarkable tensile behavior, characterized by multi-stage chemical bond rearrangements and structural phase transitions along [010] crystallographic direction, displaying multi-level stress re-enhancement phenomena. A tensile strength of 104.2 GPa and a record strain of 1.05 are observed along [010] direction. Electronic band analysis reveals that oc-C24 is a semiconductor with an indirect band gap of 2.91 eV. The impressive tensile resistance and ductility of oc-C24 suggest its strong potential applications in electronic devices under extreme conditions. Our findings offer valuable insights and methodological strategies for designing novel carbon allotropes with unique mechanical responses. © 2024, The Authors. All rights reserved.

关键词： Ethylene

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Composition optimization of high-strength Mg-Gd-Y-Zr alloys based on the structural unit of Mg-Gd solid solution

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Journal of materials science & Technology 2021年第13期72卷 104-113页

作者： Rui Jiang Shengnan Qian Chuang Dong Ying Qin Yujuan Wu Jianxin Zou Xiaoqin Zeng Key Laboratory of Materials Modification(Ministry of Education) School of Material Science and EngineeringDalian University of TechnologyDalian 116024China National Engeering Research Center of Light Alloys Net Forming School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200030China School of Materials Science and Engineering Dalian JiaotongUniversityDalian 116028China

Mg-Gd-Y-Zr alloys with high strength fall within narrow composition *** present paper explains their composition rule by establishing the cluster-plus-glue-atom unit of Gd-containing Mg solid solution with the aid of Mg matrix and Mg_(5) Gd precipitate ***,based on the structural homologue between Gd-containing Mg solid solution and Mg_(5) Gd precipitate phase and in combination with our previously established method for calculating the glue atoms,[Gd-Mg_(12)]Mg_(5) is obtained as the chemical unit of Gd-containing Mg solid ***,seven compositions are designed using different combinations of this unit and that of pure Mg[Mg-Mg_(12)*** a systematic experimental investigation on the microstructure and mechanical property evolutions as a function of the unit proportions,it is revealed that the Mg-10.1 Gd-3.3 Y-0.9 Zr alloy,being issued from equi-proportion mixing of the two units,shows the strongest tendency of precipitation and reaches the highest strength of 374 MPa after *** composition and strength of this alloy are quite close to GW103 K which is well recognized for its general mechanical performance in Mg-Gd-Y-Zr system.

关键词： Mg-Gd solid solution Chemical unit Cluster-plus-glue-atom unit Mg-Gd-Y-Zr cast alloys

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Real-time in situ visualization of internal relative humidity in fluorescence embedded cement-based materials

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Journal of Central South University 2021年第12期28卷 3790-3799页

作者： GU Hai-tao YANG Zheng-hong FAN Zhen JIANG Wei School of Materials Science and Engineering Tongji UniversityShanghai 201804China Key Laboratory of Advanced Civil Engineering Materials(Tongji University) Ministry of EducationShanghai 201804China

The transmission and distribution of moisture in cement-based materials are of great significance to the properties and durability of materials. Traditional macro-humidity monitoring equipment in civil engineering cannot capture the microscale humidity inside cement-based materials in situ. In this paper, a method of using rhodamine 6G fluorescence to characterize the change in relative humidity in cement-based materials is proposed. Two kinds of moulding processes are designed, which are premixed and smeared after moulding, and the optimal preparation concentration is explored. The results showed that rhodamine 6G can reflect the relative humidity of cement-based materials in situ by its fluorescence intensity and had little effect on the hydration heat release and hydration products of cement-based materials;the fluorescence intensity was much higher when the internal relative humidity was 63% and 75%. The research results lead the application of polymer materials in the field of traditional building materials, help to explore the performance evolution law of cement-based materials in micro scale, and have important significance for the evolution from single discipline to interdisciplinary.

关键词： biological fluorescence rhodamine dyes cement-based material relative humidity sensor

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Low-Temperature Resistant Hydrogel with Inkjet-Printed Mxene on Microspine Surface for Pressure Sensing and Triboelectric Energy Harvesting

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SSRN 2023年

作者： Jiang, Weijun Liu, Jingyuan Zhang, Hongsen Song, Dalei Yu, Jing Liu, Qi Chen, Rongrong Zhu, Jiahui Wang, Jun Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China

Wearable flexible sensors based on hydrogel fabrication have recently gained significant attention due to their unique properties. However, developing hydrogel sensors that maintain high sensitivity and work effectively in sub-zero temperatures remains a formidable challenge. Herein, a hydrogel with surfaces featuring randomly distributed microspines is synthesized by combining sodium alginate (SA) and acrylamide (AM) as the hydrogel components. To fabricate a wearable sensor, a highly conductive MXene layer is inkjet-printed onto the surface of the hydrogel microspines. The resulting sensor exhibits a remarkable array of features, including exceptional sensitivity (15.3 kPa-1), a low detection limit (10 Pa), a vast operating range (0.12-120 kPa), rapid response and recovery times (40/100 ms), reliable performance (over 1000 cycles), and outstanding resistance to low temperatures (-20 °C). Moreover, this hydrogel-based sensor facilitates the efficient collection of human monitoring data, such as vocal patterns, pulse, and joint movements, even when operating in -20 °C and in an ice bath conditions. In addition, the surface-based inkjet MXene hydrogels could be assembled into a deformable triboelectric nanogenerator (TENG), allowing mechanical energy harvesting. © 2023, The Authors. All rights reserved.

关键词： Hydrogels

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Preparation of Ni-Doped Ferrous Oxalate Nanorods Electrocatalysts for Oxygen Evolution Reaction

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SSRN 2023年

作者： Qin, Xiran Ding, He Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China

A Ni-doped ferrous oxalate nanorod electrocatalyst (Ni-FeC2O4) was synthesized using a one-step solvothermal method, which showed an outstanding OER activity with a low overpotential of 296 mV at 10 mA cm-2. The Ni-FeC2O4 electrocatalyst exhibited excellent OER stability in the 300 mV constant potential test, which was mainly attributed to the fact that Ni doping can increase the electrochemical active surface areas and the interfacial charge transfer abilities of the FeC2O4 electrocatalyst, optimize the electronic structure of the real active species ferric hydroxide, promote the formation of the decisive step *OOH of ferric hydroxide, and improve its intrinsic activity. © 2023, The Authors. All rights reserved.

关键词： Nanorods

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Enhanced buried interface behaviors for high-performance Sn-Pb perovskite solar cells

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Journal of Energy Chemistry 2025年 108卷 605-613页

作者： Jiang, Peng Gao, Qinfei Zhu, Jingwei You, Jiayu Qu, Junyu Jiao, Wenbo Wu, Shenghan Xu, Yuliang Xu, Yuan Wang, Wenwu Ren, Shengqiang Xi, Herui Yao, Canglang Xiao, Chuanxiao Chen, Cong Zhao, Dewei College of Materials Science and Engineering & Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Sichuan Chengdu610065 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Zhejiang Ningbo315201 China Ningbo New Materials Testing and Evaluation Center Co. Ltd. Zhejiang Ningbo315201 China Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai200433 China

Numerous defects at the buried interface of perovskite film and the exacerbated oxidation and degradation of tin-lead (Sn-Pb) perovskites induced by poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), due to its hygroscopic and acidic nature, limit performance improvement of Sn-Pb perovskite solar cells (PSCs). To address these issues, 1-Ethyl-3-Guanidinothiourea-Hydrochloride (EGH) was employed as a multifunctional modifier at the PEDOT:PSS/perovskite interface to regulate the buried interface behaviors of Sn-Pb PSCs. EGH can not only passivate the defects of the perovskite buried interface and regulate the work function of PEDOT:PSS for a more matched interface energy level, but also prevent the perovskite film from erosion damage by the acidic PEDOT:PSS for a more stable PEDOT:PSS/perovskite interface. Moreover, the interfacial charge transport dynamics were significantly improved by obviously suppressing interfacial non-radiative recombination losses. As a consequence, EGH-tailored 1.25 eV Sn-Pb PSCs yielded a champion PCE of 23.20%, featuring enhanced long-term stability. © 2025 science Press and Dalian Institute of Chemical Physics, Chinese Academy of sciences

关键词： Lead alloys

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Realization of zero-field skyrmions in a magnetic tunnel junction

Realization of zero-field skyrmions in a magnetic tunnel jun...

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2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023

作者： He, B. Hu, Y. Zhang, J.W. Peng, Y. Han, X.F. Yu, G.Q. Institute of Physics University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Beijing100190 China University of Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering Beijing100049 China Songshan Lake Materials Laboratory Dongguan523808 China Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education Lanzhou University Lanzhou730000 China

ISBN: (纸本)9798350338362

The stability of skyrmions in zero external magnetic field is significant for promoting fundamental studies and device applications. Here, we develop a zero-field exchange-biased skyrmion material and integrate it into an MTJ device. An Ir layer is inserted between the antiferromagnetic and ferromagnetic layers, which plays a key role in prohibiting interlayer diffusion under thermal annealing, resulting in simultaneous enhancement of exchange bias and thermal stability. The smallest zero-field skyrmions have a size of 100 nm scale at room temperature. The zero-field skyrmion material is then integrated into a perpendicularly-magnetized MTJ, leading to the first demonstration of zero-field skyrmions in an MTJ, which is an important step toward developing skyrmion-based spintronic devices. © 2023 IEEE.

关键词： Tunnel junctions

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Design, kinematic modeling and evaluation of a novel soft prosthetic hand with abduction joints

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Medicine in Novel Technology and Devices 2022年第3期15卷 98-106页

作者： Yadong Yan Xiangqian Chen Chang Cheng Yu Wang Key Laboratory of Biomechanics and Mechanobiology(Beihang University) Ministry of EducationBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing100191China Department of Mathematics and Computer Science Colorado CollegeCO80903USA

This paper presents a novel tendon-driven soft prosthetic hand with 5 fingers and 9 independent actuators.A special notched structure was used as the finger joint,which brings adequate compliance to *** soft finger has two kinds of vertically arranged joints that can produce flexion/extension and abduction/adduction motions under tension and release,enabling a three-dimensional workspace of the finger and improving the dexterity of the *** design and manufacture of the finger and soft hand are described in *** openloop kinematic model based on piecewise constant curvature of the finger was established and verified *** results show that the model could precisely predict finger *** slip resistance of the soft hand was tested,and the capacity to grasp objects was evaluated based on power grasp and precision *** abduction joints,the proposed hand can perform various gestures and in-hand manipulations,which indicate high *** work provides a way to realize high dexterity for soft prosthetic hands.

关键词： Prosthetic hand Soft hand design Dexterous grasping

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Research and modeling on correlation among microstructure,yield strength and process of bainite/martensite steel

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Journal of Iron and Steel Research International 2020年第7期27卷 834-841页

作者： Jia-jia Qiu Min Zhang Gu-hui Gao Zhun-li Tan Bing-zhe Bai School of Mechanical Electronic and Control EngineeringMaterials Science and Engineering Research CenterBeijing Jiaotong UniversityBeijing 100044China Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

The contributions of different strengthening mechanisms to yield strength of bainite/martensite multiphase rail steel with different finish cooling temperatures in the controlled cooling process were quantitatively *** density and substructure size of the rail steel were measured by scanning electron microscopy,electron backscatter diffraction and X-ray *** results show that the dislocation density increases with the decrease in block width in rail *** on the correlation among dislocation density,block width and yield strength,a physical model was proposed to predict the yield strength of rail *** variation of block width and dislocation density in different positions of rail head microstructure was integrated with temperature field *** density and block width reveal significant correlations with the finish cooling temperature.

关键词： Bainite/martensite rail steel Temperature field simulation Controlled cooling process Yield strength Dislocation density

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Research on the punch-through phenomenon of separate absorption，charge，and multiplication avalanche photodetectors

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Hongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves 2025年第3期44卷 327-334页

作者： Li, Chong Ma, Zi-Yi Yang, Shuai Liu, Yue-Wen Wang, Jia-Xuan Liu, Yun-Fei Dong, Yu-Sen Li, Zi-Qian Liu, Dian-Bo Key Laboratory of Optoelectronics Technology of Ministry of Education School of Information Science and Technology Beijing University of Technology Beijing100124 China Institute of Advanced Semiconductor Optoelectronic Technology School of Physics and Optoelectronic Engineering Beijing University of Technology Beijing100124 China

In this paper，the punch-through phenomenon was studied，based on a fabricated separate absorption，charge，and multiplication avalanche photodetector（SACM APD）. The spectral response，capacitance characteristics，and I-V characteristics at different operating temperatures of the APD were measured and analyzed. Meanwhile，the device performance before and after the punch-through phenomenon were compared，and the model of the electric field region formed by external voltage was analyzed，based on the measurement results and the simulated electric field and energy band distributions by SILVACO. When the ion implantation energy of the charge layer was 580 KeV，the simulated device had a punch-through voltage of -30V and a capacitance reduction of one-third before punch-through. Then，a Si SACM APD was prepared based on CMOS process. The punch-through voltage of the device was -30V and the capacitance was reduced to 1/3@1MHz before punch-through，which exactly matched the simulation results. Moreover，the photocurrent after punch-through increases to 2. 18 times of the before value at 808 nm. The peak responsivity increases from 0. 171 A/W@590 nm to 0. 377 A/W@820 nm. © 2025 Chinese Optical Society. All rights reserved.

关键词： Capacitance

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