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SSRN 2023年

作者： Chen, Lian Zhang, Kaihang Duan, Gaigai Yang, Xuxu Wei, Xianshuo Wang, Feng Zhang, Chunmei Cao, Xingyu Ma, Chunxin Jiang, Shaohua Jiangsu Co-Innovation Center of Efficient Processing Utilization of Forest Resources International Innovation Center for Forest Chemicals and Materials College of Materials Science and Engineering Nanjing Forestry University Nanjing210037 China Department of Engineering Mechanics Zhejiang University Hangzhou310027 China Institute of Materials Science and Devices School of Materials Science and Engineering Suzhou University of Science and Technology Suzhou215009 China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou570228 China

Hydrogel actuators with controllable deformation and excellent biocompatibility are widely used in soft robot, valve, drug delivery and lenses. However, the stimulation response performance of existing hydrogel actuators mostly focuses on a single active layer, which greatly affects its driving performance and service life. In this work, we integrate temperature-responsive hydrogel (Poly (N-isopropyl acrylamide), PNIPAM) and pH-responsive hydrogel (polyacrylic acid, PAAc) into one system to fabricate a dual active layer composite hydrogel actuator with high performance. Based on the PAAc hydrogels achieving contract or expand at different pH values, the obtained actuator exhibits admirable bidirectional bending characteristics. In addition, the anisotropic bamboo sheet endows the hydrogel actuator with programmable 3 D complex deformation. Benefitting from the synergy and different responsiveness between the two active layers, the hydrogel actuator not only has multiple response performance, but also greatly improves its deformation degree and response speed. More importantly, these promising properties of the actuator have broad application prospects in the development of pattern design and intelligent switch. This work proposes a promising strategy for the structural design of hydrogel actuators with excellent performance, and encourages more exploration of the application range of the actuator. © 2023, The Authors. All rights reserved.

关键词： Actuators

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Fabrication of Geometrically-Complex Tungsten Carbide-Based materials Via Vat Photopolymerization

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SSRN 2022年

作者： Wang, Xiang-Mei Cheng, Ling-Yu Shi, Zhang-Ao Wu, Jia-Min Tian, Chong Wei, Hua-Yang Zhao, Kai Shi, Yu-Sheng Shanghai Aerospace Equipments Manufacturer Co Ltd. Shanghai200245 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of Education Wuhan430074 China Co Ltd. Jinan250000 China

The preparation of dark-colored non-oxide ceramic by vat photopolymerization has motivated increasing research interest, and the corresponding dark-colored non-oxide material modification can serve as rich and fascinating platform to produce complex-shaped dark-colored non-oxide materials effectively. It is a significant challenge to fabricate complicated shape tungsten carbide (WC) material due to the large refractive index (2.42) and high UV light absorption (0.8903 at a wavelength of 405 nm). In this context, the method of filling WC powders into bowl-like hollow boehmite microspheres (WC-BHBSs) has been successfully introduced. The curing behavior of WC-BHBSs ceramic suspension has been improved with boehmite concentration from 10 wt.% to 40 wt.%. It can be found from SEM images that boehmite microspheres filled with WC particles acted as a barrier shell blocking WC particles from absorbing UV light and lessening the refractive index difference between ceramic powders and resins. After optimizing the printing parameters, geometrically-complex WC-based green bodies with high precision were fabricated with 800 mJ/cm 2 exposure energy under 40 vol.% solid loading. When sintered at 1900°C, boehmite was transformed into the liquid phase and then the microstructure achieved crystallization and densification during the cooling procedure. As boehmite content increased from 10 wt.% to 40 wt.%, the shrinkage and volume density enhance simultaneously, both values peaked at 40 wt.% due to the microstructure densification, but the open porosity reduced correspondingly. This approach provides a constructive method not only for modifying WC particles to achieve photopolymerization but also for other dark-colored non-oxidation materials without photocuring ability. © 2022, The Authors. All rights reserved.

关键词： Microstructure

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Room-temperature large photoinduced magnetoresistance in semi-insulating gallium arsenide-based device

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Chinese Physics B 2018年第6期27卷 394-399页

作者： Xiong He Zhi-Gang Sun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

It is still a great challenge for semiconductor based-devices to obtain a large magnetoresistance（MR） effect under a low magnetic field at room temperature. In this paper, the photoinduced MR effects under different intensities of illumination at room temperature are investigated in a semi-insulating gallium arsenide（SI-Ga As）-based Ag/SI–Ga As/Ag device. The device is subjected to the irradiation of light which is supplied by light-emitting diode（LED） lamp beads with a wavelength in a range of about 395 nm–405 nm and the working power of each LED lamp bead is about 33 mW. The photoinduced MR shows no saturation under magnetic fields（B） up to 1 T and the MR sensitivity S（S = MR/B） at low magnetic field（B = 0.001 T） can reach 15 T^（-1）. It is found that the recombination of photoinduced electron and hole results in a positive photoinduced MR effect. This work implies that a high photoinduced S under a low magnetic field may be obtained in a non-magnetic semiconductor device with a very low intrinsic carrier concentration.

关键词： GaAs magnetoresistance carrier recombination

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Enhanced performance of solid-state Li–O_2 battery using a novel integrated architecture of gel polymer electrolyte and nanoarray cathode

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Rare Metals 2018年第6期37卷 527-535页

作者： Liang Xiao Er-Wei Li Jing-Yu Yi Wen Meng Bo-Hua Deng Jin-Ping Liu School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The present work proposes a novel strategy to fabricate an integrated architecture of gel polymer electrolyte （GPE）-nanoarray cathode for lithium-O2 batteries （LOBs）. As a proof-of-concept experiment, the photo-initiated in situ polymerization of GPE was carried out via incorporating the precursor solution in advance into a self- standing binder-free oxygen electrode of Co3O4 nanosheets array grown on carbon cloth （Co3O4@CC）, forming an integrated GPE-Co3O4@CC architecture. The performance of the solid-state LOBs using the GPE-Co3O4@CC assembly is greatly enhanced compared to the counterparts with a traditional cell structure, in which GPE was sandwiched by a lithium metal and a cathode. The enhanced performance is ascribed to the combination of the in situ polymerization of GPE and the versatile structure of nanoarray electrode, which results in abundant interfacial contacts between GPE and electrode. This work presents an alternative way to develop high-performance solid-state LOBs by combining the advantages of both gel polymer electrolytes and nanoarray electrodes.

关键词： Solid-state Li-O2 battery Gel polymer electrolyte Co3O4 nanosheet Nanoarray electrode Electrolyte-cathode interface

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Breakdown strength and energy density enhancement in polymer-ceramic nanocomposites: Role of particle size distribution

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COMPOSITES SCIENCE AND technology 2021年 212卷

作者： Wu, Longwen Cai, Ziming Li, Longtu Wang, Xiaohui College of Electrical Engineering Sichuan University Chengdu 610065 China School of Materials Science and Physics China University of Mining and Technology Xuzhou 221116 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China

Polymer-ceramic nanocomposites play a very promising role for energy-storage in high power electronics and advanced pulsed power systems, due to their extremely fast charge-discharge capability. The low energy density is the key factor hindering their application, for which large endeavors have been made in the modulation of the fraction, morphology, size, and dispersion of the particle fillers but small in that of the size distribution, which is critical for energy-storage performance. We first investigated the role of this based on simulated nanocomposites with controlled lognormal distributions via a generation algorithm devised in this work. Dielectric response, breakdown behavior and energy-storage performance were explored for distributions with different standard deviations (SD) and mean values (MV), which were solved with the energy equivalence basis and a phase-field dielectric breakdown model. With the decrease of SD and MV, the effective permittivity declines slightly with enhanced permittivity change, which was related with the enhanced local electric field with intensified fluctuation and should be originated from the major contribution of the polymer matrix from the local energy perspective;whereas improved nominal breakdown strength was achieved owing to the weakened local maximum electric field, which leads to distinctly increased nominal energy density despite the slight decline of the permittivity. Keeping the fillers within a narrow disperse outperforms employing super fine particles. This work demonstrates that enhancement in breakdown strength and energy density can be attained via particle size distribution modulation, paving a new way for the further improvement of the energy-storage performance of polymer-ceramic nanocomposites.

关键词： Nanocomposite Breakdown strength Energy density Particle size Distribution

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Advances in additive manufacturing of SiC/Al composites: A review

Review of Materials Research

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Review of materials Research 2025年第2期1卷

作者： Guizhou Liu Zhihao Wang Chunze Yan Yusheng Shi State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of Education Wuhan 430074 China

SiC/Al composites are widely utilized in aerospace, optics, automobile, and electronic packaging due to their high specific strength and modulus, wear resistance, and low coefficient of thermal expansion. Traditional preparation techniques for SiC/Al composites, such as powder metallurgy, casting, and infiltration, have advanced to a mature stage of research, with certain outcomes transitioning into industrial applications. The incorporation of the SiC ceramic phase in SiC/Al composites improves their mechanical properties while posing challenges for conventional mechanical processing methods. Additive manufacturing (AM) involves converting a 3D solid model (CAD model) of a part into a series of 2D layer-sheet data, which are then used to build up materials layer by layer in a specific sequence to create a 3D solid part. Compared to traditional methods, AM offers significant advantages in terms of customization and the fabrication of complex parts. This paper extensively discusses 7 a.m. methods for fabricating SiC/Al composites, categorizing them as direct or indirect manufacturing based on their forming process. With the continuous advancement in materials science and technology, the enhancement of SiC/Al composite properties and exploration of new application areas persist. It is expected that SiC/Al composites will play a vital role in high-end manufacturing sectors and propel technological progress in related industries. This review provides researchers in the field of composites with insights to leverage AM for producing SiC/Al composites.

关键词： SiC/Al composites Indirect additive manufacturing Direct additive manufacturing

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Residual Stress-Activated Grain Boundary Engineering of Selective Laser Melted Inconel 718 and Corrosion Behaviour

SSRN

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SSRN 2022年

作者： Liu, Bo Ding, Yutian Xu, Jiayu Gao, Yubi Chu, Cheng Xue, Shengbing Hu, Yong State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Gansu Lanzhou730050 China School of Material Science and Engineering Lanzhou University of Technology Gansu Lanzhou730050 China School of Electromechanics and Automobile Engineering Tianshui Normal University Gansu Tianshui741001 China

In this work, the indirect grain boundary engineering (GBE, without plastic deformation) induced by inherent residual stress in selective laser melted (SLM) Inconel 718 superalloy was employed to successfully obtain different fraction of special low coincidence site lattice (CSL, Σ ≤ 29) grain boundaries (GBs). The grain boundary character distribution (GBCD) and corresponding corrosion behaviours in 3.5 wt% NaCl solution are systematically investigated. The results reveal that GBEed specimen of the 1200-1-DA possesses the highest fraction of Σ3 GBs (64.89%) and thus can effectively divide the coarse grains (64.33 μm) to 13.72 μm. The corrosion resistance is closely related the fraction of low Σ CSL GBs (especially for Σ3) because that can break up the random boundary networks, demonstrating excellent corrosion resistance of the 1200-1-DA with more compact and stronger passive films. Furthermore, the main composition (oxide and their metallic state) of thicker passive films provides intrinsic protection for the matrix be corroded. This study proposes a feasible approach for GBE of additive manufacturing (AM), and contributes to broadening the scope of applications for AM metal structural materials. © 2022, The Authors. All rights reserved.

关键词： Residual stresses

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A Novel Low-Cost High-Strength Β Titanium Alloy Microstructure Evolution and Mechanical Behavior

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SSRN 2022年

作者： Li, C.C. Xin, Chao Wang, Qi Ren, Junqiang Zhao, B. Wu, J.P. Pan, X.L. Lu, Xuefeng State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China Xi'an Rare Metal Materials Institute Co. Ltd Shaanxi Xi'An710016 China School of Energy Engineering Huanghuai University Zhumadian463000 China Xi’an Surface Material Protection Co. Ltd. Xi'An710200 China

A novel metastable β-titanium alloy (Ti-4.8Al-5.6Mo-3V-1.5Cr-1.6Fe) with low-cost and high-strength was designed using the d-electron theory approach. A multiscale structure composing of β matrix, primary αp (volume fraction of 21%) and the precipitates αs were obtained after solution at 780 °C and aging at 470, 500, and 530 °C. The density and average spacing of precipitates were dependence of the aging temperature. The dense αs with the average spacing (λ) less than 100 nm were precipitated aging at 470 °C due to the greater driving force for formation of αs. In contrast, the coarse αs with the average spacing (λ) greater than 100 nm were precipitated aging at 530 °C due to the greater driving force for growth of αs. The tensile properties were also sensitive to the density and spacing precipitates αs inside the β matrix. A tensile strength ranging from 1512 MPa to 1648 MPa and tensile elongation ranging from 1.8% to 7.8% were reported by controlling the density and average spacing of precipitates αs inside the β matrix. Particularly, an excellent combination of high tensile strength (1512 MPa) and relatively high elongation (7.8%) was obtained by aging at 530 °C. © 2022, The Authors. All rights reserved.

关键词： Titanium alloys

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Ultra-high-amplitude Peregrine solitons induced by helicoidal spin-orbit coupling

arXiv

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arXiv 2024年

作者： Ding, Cui-Cui Zhou, Qin Malomed, B.A. Research Group of Nonlinear Optical Science and Technology Research Center of Nonlinear Science School of Mathematical and Physical Sciences Wuhan Textile University Wuhan430200 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Department of Physical Electronics School of Electrical Engineering Faculty of Engineering The Center for Light-Matter University Tel Aviv University Tel Aviv Israel Instituto de Alta Investigación Universidad de Tarapacá Casilla 7D Arica Chile

In the framework of the model of a spatially non-uniform Bose-Einstein condensate with helicoidal spin-orbit (SO) coupling, we find abnormal Peregrine solitons (PSs) on top of flat and periodic backgrounds, with ultra-high amplitudes. We explore the roles of the SO coupling strength and helicity pitch in the creation of these anomalously tall PSs and find that their amplitude, normalized to the background height, attains indefinitely large values. The investigation of the modulation instability (MI) in the same system demonstrates that these PSs exist in a range of relatively weak MI, maintaining the feasibility of their experimental observation. Copyright © 2024, The Authors. All rights reserved.

关键词： Solitons

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Sodium phytate stabilizing lattice oxygen in high-nickel oxide cathodes for thermal runaway inhibition and high voltage operation

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Science bulletin 2025年

作者： Yuanke Wu Qiang Wu Ziqi Zeng Yixuan Dong Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China. Electronic address: ziqizeng@***. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China. Electronic address: xiejia@***.

The reactive oxygen species (O*) released from the nickel-rich layered oxide cathodes (LiNiCoMnO, NCM) are responsible for triggering thermal runaway (TR) in lithium-ion batteries (LIBs). Specifically, the charge compensation from transition metal (TM) 3d to oxygen (O) 2p in NCM plays a pivotal role in O* release. Here, inspired by the strong chelating effect of sodium phytate (PN) on TM, we employ PN as a cathode additive to coordinate with nickel, thereby weakening the charge compensation of TM 3d to O 2p on the surface of LiNiCoMnO (NCM811) and ultimately enhancing battery safety. It is shown that the chelation successfully stabilizes lattice oxygen and suppresses the release of O*, preventing detrimental phase transitions in NCM811 and reducing heat generation from O* related crosstalk reactions. Consequently, the TR trigger temperature (T) of NCM811 pouch cell with PN elevates from 125.9 to 184.8 °C, while the maximum temperature (T) decreases from 543.7 to 319.7 °C. Moreover, the PN-derived modification layer allows NCM811 to maintain exceptional cycling stability for over 700 cycles at 4.6 V. This strategy provides a facile method for stabilizing lattice oxygen in NCM, inhibiting O*-triggered TR, and enhancing high-voltage performance.

关键词： Battery safety Chelation Chemical crosstalk Lithium−ion battery Reactive oxygen species Thermal runaway

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