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Polymer Mechanochemistry in Confined Spaces

Angewandte Chemie 2024年第1期137卷

作者： Hui Hu Prof. Yang Zhou Prof. Bin Xi Prof. Yuanchao Li School of Materials Science and Engineering Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Sun Yat-Sen University Guangzhou 510006 China School of Textile Science and Engineering State Key Laboratory of New Textile Materials and Advanced Processing Technology Wuhan Textile University Wuhan 430200 China

With the development of mechanophores, polymer mechanochemistry has emerged as a powerful tool for creating force-responsive materials with a variety of desired functions, ranging from color change to molecular release. However, it remains challenging to improve the efficiency of mechanochemical activation, especially for mechanophores embedded within polymer networks, which has profound implications for translating mechanochemical responses into materials-centered applications. The physical and chemical conditions under spatial confinement differ significantly from those in the surrounding bulk environment, offering opportunities to facilitate mechanochemical activation. In this Minireview, we discuss and summarize recent progress in polymer mechanochemistry within confined spaces including surfaces/interfaces, polymer assemblies, and other nanostructures, specifically focusing on the effects of spatial confinement on the enhancement of mechanophore activation. We envision that combining confinement effects with advances in molecular and materials engineering will further improve the activation efficiency, capitalizing more fully on the potential of mechanophores toward practical applications.

关键词： polymer mechanochemistry confined spaces activation mechanophores confinement effects

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Investigation on the elevated-temperature mechanical properties of TiB2/Al-4.5%Cu composites 8

Investigation on the elevated-temperature mechanical propert...

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2020 8th International Conference on advanced Manufacturing technology and materials Engineering, AMTME 2020

作者： Xue, Yanqing Su, Ru Wei, Dian Li, Bo Wang, Xinliang Zhang, Han Hao, Qitang State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an Shaanxi710072 China School of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang Hebei050018 China

Mechanical performance of TiB2/Al-4.5%Cu composites at elevated-temperature were evaluated by means of tensile behaviors and fracture mechanisms. Results indicated that the composite reinforced by nano-sized TiB2 particles exhibited excellent mechanical ability during deformation at elevated temperatures, the optimum addition level for dispersion, refinement and modification was 5wt.% TiB2/Al-4.5%Cu at 473K, i.e., yield strength is 358MPa and elongation is 4 %. The enhanced resistance of the composite was mainly attributed to Orowan strengthening and load transfer enhancement, additionally, interface debonding increasingly affects the damage and fracture of the composites. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Titanium compounds

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Design, Fabrication, and Characterization of 1-3 Piezoelectric Composite Air-Coupled Ultrasonic Transducers with Micro-Membrane Filter Matching Layer

SSRN

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SSRN 2024年

作者： Wang, Chuanmin Gao, Huayun Zhou, Xinyi Ma, Weigang Tan, Hua Samart, Chanatip Salamon, David Yan, Chunze Zhang, Haibo School of Materials Science and Engineering State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan430074 China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of Education Wuhan430074 China Guangdong HUST Industrial Technology Research Institute Dongguan523808 China Department of Chemistry Faculty of Science and Technology Thammasat University Pathumthani12120 Thailand Central European Institute of Technology Brno University of Technology Brno Czech Republic Faculty of Chemical Engineering Industrial University of Ho Chi Minh City Ho Chi Minh City71420 Viet Nam

Air-coupled ultrasonic transducers are widely used in various fields of nondestructive material characterization. This paper presents the fabrication and performance characterization of 1-3 piezoelectric composite air-coupled ultrasonic transducers operating at frequencies ranging from 400 kHz to 600 kHz. The transducers are fabricated using a dice-and-fill method with PZT-5 as the active material. A double-layer matching strategy is employed, utilizing hollow glass microsphere filled epoxy resin as the first matching and bonding layer. Additionally, micro-membrane filters with different pore sizes are used as the second matching layer. Thermoplastic adhesive TPU is utilized to bind the micro-membrane filter and the first matching layer. Due to the low acoustic impedance of the hollow glass microsphere filled epoxy resin and micro-membrane filter, acoustic impedance mismatch is reduced. Finite element simulation is used to determine the optimal ceramic volume fraction and ceramic pillar height of the 1-3 piezoelectric composites. When the pore size of the micro-membrane filter is 0.8 μm, the transducer achieves the lowest two-way insertion loss of -56.86 dB and the highest -6 dB bandwidth of 15.6 %, making it feasible for pulse-echo mode applications. © 2024, The Authors. All rights reserved.

关键词： Acoustic impedance

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Spatiotemporal Modulated Solitons in a Quasi-One-Dimensional Spin-1 Bose-Einstein Condensates

SSRN

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SSRN 2024年

作者： Liu, Fei-Yan Xu, Su-Yong Triki, Houria Choudhuri, Amitava Zhou, Qin Research Group of Nonlinear Optical Science and Technology School of Mathematical and Physical Sciences Wuhan Textile University Wuhan430200 China College of Optical Mechanical and Electrical Engineering Zhejiang A&F University Lin’an 311300 China Radiation Physics Laboratory Department of Physics Faculty of Sciences Badji Mokhtar University P. O. Box 12 Annaba23000 Algeria Department of Physics The University of Burdwan West Bengal Golapbag 713104 India State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China

In this paper, we investigate the nonautonomous bright/dark solitons in a quasi-one-dimensional spin-1 Bose-Einstein condensates through a three coupled Gross-Pitaevskii (GP) system with space-time-dependent external potential and temporally modulated gain/loss distributions. Based on the Hirota bilinear method, we analytically construct the bright soliton solutions when the coupled GP system exhibits attractive interactions, while we obtain the dark soliton solutions when the coupled GP system exhibits repulsive interactions. The influence of spatiotemporal modulated external potentials, such as the gain/loss distribution Γ(t), on bright/dark soliton dynamics is analyzed in detail via the analytical solutions. By taking different Γ(t), we obtain different types of bright solitons, including periodic, dromion-like and parabolic solitons, and also derive dark solitons on different backgrounds, such as periodic, parabolic and kink backgrounds. We analyze the regulatory effects of different wavenumber ratios on the attraction and squeezing of bound-state solitons. Through the asymptotic analysis, we find that the interactions between two solitons are elastic. In addition, we conduct research on the forward and inverse problems of the above results via the parallel hard-constraint physical informed neural network (phPINN) method. The predicted solitons and potential functions are in good agreement with the exact solitons and potential in the system. © 2024, The Authors. All rights reserved.

关键词： Solitons

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Quadrupling the stored charge by extending the accessible density of states

arXiv

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arXiv 2021年

作者： Yan, Mengyu Wang, Peiyao Pan, Xuelei Wei, Qiulong Liu, Jefferson Z. Zhao, Yunlong Zhao, Kangning Dunn, Bruce Liu, Jun Yang, Jihui Mai, Liqiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Materials Science and Engineering University of Washington SeattleWA98105 United States Department of Mechanical Engineering University of Melbourne VIC3010 Australia Department of Chemistry and Biochemistry University of California Los AngelesCA90095 United States Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan528200 China

Nanosized energy storage, energy-harvesting, and functional devices are the three key components for integrated self-power systems. Here, we report on nanoscale electrochemical devices with a nearly three-fold enhanced stored charge under the field effect. We demonstrated the field-effect transistor can not only work as a functional component in nanodevices but also serve as an amplifier for the nanosized energy storage blocks. This unusual increase in energy storage is attributed to having a wide range of accessible electronic density of states (EDOS), hence redox reactions are occurring within the nanowire and not being confined to the surface. Initial results with MoS2 suggest that this field effect modulated energy storage mechanism may also apply to many other redox-active materials. Our work demonstrates the novel application of the field-effect in energy storage devices as a universal strategy to improve ion diffusion and the surface-active ion concentration of the active material, which can greatly enhance the charge storage ability of nanoscale devices. The fabrication process of the field-effect energy storage device is also compatible with microtechnology and can be integrated into other microdevices and nanodevices. Copyright © 2021, The Authors. All rights reserved.

关键词： Electrochemistry

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Gas sensing selectivity of oxygen-regulated SnO2 films with different microstructure and texture

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Journal of materials Science & technology 2019年第10期35卷 2232-2237页

作者： Ruiwu Li Yanwen Zhou Maolin Sun Zhen Gong Yuanyuan Guo Xitao Yin Fayu Wu Wutong Ding School of Material Science and Metallurgy University of Science and Technology LiaoningAnshan114051China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou730050China

The selectivity of gas sensing materials is increasingly important for their applications. The oxygenregulated SnO2 films with(110) and(101) preferred orientation were obtained through magnetron sputtering, followed by annealing treatment. Their micro-structure, surface morphology and gas response were investigated by advanced structural characterization and property measurement. The results showed that the as-prepared(110)-oriented SnO2 film was oxygen-rich and had more adsorption sites while the as-prepared(101)-oriented SnO2 film was oxygen-poor and more sensitive to de-oxidation.H2 gas sensitivity, response speed, selectivity between H2 and CO of the(110)-orientated SnO2 film was superior to that of the(101)-orientated SnO2 film. After treated at high temperature and high vacuum,the reduction of gas-sensing properties of the annealed(110) SnO2 film was much more than that of the annealed(101) SnO2 film. The lattice oxygen was responsible for the difference in gas-sensing response between(110) and(101)-oriented SnO2 films under oxygen regulation. This work indicated the gassensing selectivity of the different crystal planes in SnO2 film, providing a significant reference for design and extension of the related materials.

关键词： Gas sensor SnO2 Oxygen regulation Preferred orientation H2 selectivity

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Rational design on high-performance triboelectric nanogenerator consisting of silicon carbide@silicon dioxide nanowhiskers/polydimethylsiloxane (SiC@SiO2/PDMS) nanocomposite films

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Discover Nano 2023年第1期18卷 69-69页

作者： Zhao, Kun Sun, Wanru Li, Suixin Song, Zhenhua Zhong, Ming Zhang, Ding Gu, Bing-Ni Liu, Ming-Jin Fu, Hao Liu, Hongjie Meng, Cheng Chueh, Yu-Lun State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin300350 China Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China Colleage of Semiconductor Research National Tsing-Hua University Hsinchu30013 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices School of Chemistry Biology and Materials Science East China University of Technology Nanchang330013 China

The relatively low output performance of triboelectric nanogenerator (TENG), which faces a challenge in performance improvement, limits its practical applications. Here, a high-performance TENG consisting of a silicon carbide@silicon dioxide nanowhiskers/polydimethylsiloxane (SiC@SiO2/PDMS) nanocomposite film and a superhydrophobic aluminum (Al) plate as triboelectric layers is demonstrated. The 7 wt% SiC@SiO2/PDMS TENG presents a peak voltage of 200 V and a peak current of 30 μA, which are ~ 300 and ~ 500% over that of the PDMS TENG, owing to an increase in dielectric constant and a decrease in dielectric loss of the PDMS film because of electric insulated SiC@SiO2 nanowhiskers. Furthermore, a 10 μF capacitor can be charged up to 3 V within ~ 87 s, which can be continuously operated on the electronic watch for 14 s. The work provides an effective strategy for improving output performance of TENG by adding core–shell nanowhiskers to modulate the dielectric properties of organic materials. Graphical abstract: [Figure not available: see fulltext.] © 2023, The Author(s).

关键词： Silica

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Influenza viruses and SARS-CoV-2 diagnosis via sensitive testing methods in clinical application

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Heliyon 2024年第18期10卷 e36410页

作者： Zhang, Le Li, Chunwen Shao, ShaSha Zhang, Zhaowei Chen, Di Department of Critical Care Medicine Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 China School of Ecology and Environment Tibet University Lhasa 850000 China Department of Emergency Medicine The Second Affiliated Hospital of Chongqing Medical University Chongqing 400010 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies School of Bioengineering and Health Wuhan Textile University Wuhan 430200 China

The identification of influenza viruses and SARS-CoV-2 has garnered increasing attention due of their longstanding global menace to human life and health. The point-of-care test is a potential approach for identifying influenza viruses and SARS-CoV-2 in clinical settings, leading to timely discovery, documentation, and treatment. The primary difficulties encountered with conventional detection techniques for influenza viruses and SARS-CoV-2 are the limited or inadequate ability to identify the presence of the viruses, the lack of speed, precision, accuracy, sensitivity, and specificity, often resulting in a failure to promptly notify disease control authorities. Recently, point-of-care test methods, along with nucleic acid amplification, optics, electrochemistry, lateral/vertical flow, and minimization, have been demonstrated the characteristics of reliability, sensitivity, specificity, stability, and portability. A point-of-care test offers promising findings in the early detection of influenza viruses and SARS-CoV-2 in both scientific research and practical use. In this review, we will go over the principles, advantages, limitations, and real-world applications of point-of-care diagnostics. The significance of constraints of detection, throughput, sensitivity, and specificity in the analysis of clinical samples in settings with restricted resources is underscored. This discussion concludes with their prospects and challenges. © 2024

关键词： Influenza viruses Point of care test Rapid SARS-CoV-2 Sensitivity

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Interpolation and extrapolation with the CALPHAD method

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Journal of materials Science & technology 2019年第9期35卷 2115-2120页

作者： Qun Luo Cong Zhai Dongke Sun Wei Chen Qian Li State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering. Shanghai University & Shanghai Institute of Materials Genome & Materials Genome Institute Shanghai University333 Nanchen RoadShanghai 200444 China School of Mechanical Engineering Southeast UniversityNanjing 211189China Key Laboratory of Power Beam Processing AVIC Manufacturing Technology InstituteBeijing 100024China

It is widely reported that CALPHAD is an extrapolation method when the thermodynamic properties of a multicomponent system are approximated by its *** this work the meaning of the words extrapolation and interpolation is discussed in context of the CALPHAD *** assessing the properties in binary and ternary systems,extrapolation method is indeed often ***,after assessment,the Gibbs energies are in fact interpolated from the lower order systems into the higher order systems in the compositional *** metastable melting temperatures of bcc and hep in Re-W and the liquid miscibility gap in Mg-Zr system are predicted to illustrate the difference between interpolation and extrapolation.

关键词： CALPHAD Interpolation Extrapolation Gibbsenergy

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Confining Conversion Chemistry in Intercalation Host for Aqueous Batteries

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Angewandte Chemie 2024年第38期136卷

作者： Qiuyue Gui Wenjun Cui Deliang Ba Prof. Xiahan Sang Prof. Yuanyuan Li Jinping Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan Hubei 430070 China Nanostructure Research Center Wuhan University of Technology Wuhan Hubei 430070 China School of Integrated Circuits Huazhong University of Science and Technology Wuhan Hubei 430074 China

Conversion-type anode materials with high theoretical capacities play a pivotal role in developing future aqueous rechargeable batteries (ARBs). However, their sustainable applications have long been impeded by the poor cycling stability and sluggish redox kinetics. Here we show that confining conversion chemistry in intercalation host could overcome the above challenges. Using sodium titanates as a model intercalation host, an integrated layered anode material of iron oxide hydroxide-pillared titanate (FeNTO) is demonstrated. The conversion reaction is spatially and kinetically confined within sub-nano interlayer, enabling superlow redox polarization (ca. 4–6 times reduced), ultralong lifespan (up to 8700 cycles) and excellent rate performance. Notably, the charge compensation of interlayer via universal cation intercalation into host endows FeNTO with the capability of operating well in a broad range of aqueous electrolytes (Li + , Na + , K + , Mg 2+ , Ca 2+ , etc.). We further demonstrate the large-scale synthesis of FeNTO thin film and powder, and rational design of quasi-solid-state high-voltage ARB pouch cells powering wearable electronics against extreme mechanical abuse. This work demonstrates a powerful confinement means to access disruptive electrode materials for next-generation energy devices.

关键词： conversion chemistry intercalation host sub-nano confinement aqueous rechargeable batteries wearable pouch cell

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