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Enhancing energy conversion efficiency in entangled hydrogel actuators

science China materials 2024年第12期67卷 3956-3965页

作者： Bin Zhang Jianhui Qiu Xuefen Meng Eiichi Sakai Huixia Feng Liang Zhang Jianhua Tang Guohong Zhang Hong Wu Shaoyun Guo Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityYurihonjyo 015-0055Japan College of Petrochemical Technology Lanzhou University of TechnologyLanzhou 730050China Shaanxi Expressway Test and Inspection Company Ltd.Xi’an 710086China The State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610065China

Traditional hydrogels-based actuators are hindered by limitations such as low deliverable forces(∼2 kPa)and sluggish actuation speeds,culminating in persistent issues with low work density(∼0.01 kJ/m^(3)).Furthermore,achieving low hysteresis and high strength presents significant challenges in both their synthesis and ***,we developed poly(acrylic acid)hydrogels characterized by sparse cross-linking and high entanglement,effectively addressing these *** by the energy conversion mechanisms of mammalian muscle fibers,the hydrogels were utilized for storing and releasing elastic potential energy in polymer ***,we achieved a remarkable contractile force of 60.6 kPa,an ultrahigh work density of 30.8 kJ/m^(3),and an energy conversion efficiency of up to 53.8%.Furthermore,the hydrogels exhibit unique dual-state functionality,seamlessly transitioning between elasticity and plasticity,which paves the way for adaptable and precisely controllable energy release *** features hold significant potential for diverse practical applications,providing a promising advancement for hydrogel actuators.

关键词： hydrogel entanglement energy storage release

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Low-temperature superplasticity of β-stabilized Ti-43Al-9V-Y alloy sheet with bimodalγ-grain-size distribution

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Journal of materials science & Technology 2021年第36期95卷 225-236页

作者： Yu Zhang Shuai Chang Yuyong Chen Yuchao Bai Cuiling Zhao Xiaopeng Wang Jun Min Xue Hao Wang Department of Mechanical Engineering Faculty of EngineeringNational University of Singapore9 Engineering Drive 1Singapore 117575Singapore Department of Materials Science and Engineering Faculty of EngineeringNational University of Singapore9 Engineering Drive 1Singapore 117576Singapore State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China

The superplasticity of Ti-43Al-9V-0.2Y alloy sheet hot-rolled at 1100℃was systematically investigated in the temperature range of 750-900℃under an initial strain rate of 10^(-4)s^(-1).A bimodalγgraindistribution microstructure of Ti Al alloy sheet,with abundant nano-scale or sub-micronγlaths embedded insideβmatrix,exhibits an impressive superplastic *** inhomogeneous microstructure shows low-temperature superplasticity with a strain-rate sensitivity exponent of m=0.27 at 800℃,which is the lowest temperature of superplastic deformation for Ti Al alloys attained so *** maximum elongation reaches~360%at 900℃with an initial strain rate of 2.0×10^(-4)s^(-1).To elucidate the softening mechanism of the disorderedβphase during superplastic deformation,the changes of phase composition were investigated up to 1000℃using in situ high-temperature X-ray diffraction(XRD)in this *** results indicate thatβphase does not undergo the transformation from an ordered L2;structure to a disordered A2 structure and cannot coordinate superplastic deformation as a *** on the microstructural evolution and occurrence of bothγandβdynamic recrystallization(DR)after tensile tests as characterized with electron backscatter diffraction(EBSD),the superplastic deformation mechanism can be explained by the combination of DR and grain boundary slipping(GBS).In the early stage of superplastic deformation,DR is an important coordination mechanism as associated with the reduced cavitation and dislocation density with increasing tensile *** DR can relieve stress concentration arising from dislocation piling-up at grain boundaries through the fragmentation from the original coarse structures into the fine equiaxed ones due to recrystallization,which further effectively suppresses apparent grain growth during superplastic *** the late stage of superplastic deformation,these equiaxed grains make GBS prevalent,which can effectively avoid intergranu

关键词： Titanium aluminides Hot-rolled alloy sheet Bimodal microstructure In situ high-temperature XRD Superplasticity

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Crystallization Kinetics and Nanoindentation Studies of Cu46zr40ti8.5al5.5 Glassy Alloy

SSRN

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SSRN 2023年

作者： Prabhu, Yogesh Jain, Abhilasha Narayan, R. Lakshmi Saini, Priyanka Vincent, S. Ryu, W.H. Park, E.S. Bhatt, Jatin Department of Metallurgical and Materials Engineering Visvesvaraya National Institute of Technology Nagpur440 010 India Centre for Materials Science School of Mechanical Engineering KLE Technological University Hubballi580031 India Department of Materials Science and Engineering Indian Institute of Technology Hauz Khas New Delhi110016 India Department of Mechanical Engineering Birla Institute of Technology and Science Pilani Dubai Campus Dubai345055 United Arab Emirates Department of Materials Science and Engineering Research Institute of Advanced Materials Institute of Engineering Research Seoul National University Seoul08826 Korea Republic of

Crystallization kinetics of Cu46Zr40Ti8.5Al5.5 metallic glass is investigated in non-isothermal and isothermal conditions. In non-isothermal condition, crystallization activation energy is determined using Kissinger’s method. Further, activation energy of reported Cu-Zr-Al metallic glasses are compared to Cu46Zr40Ti8.5Al5.5 alloy to understand the effect Ti addition on crystallization kinetics. Detailed investigation on activation energy through the crystallization process is studied. To understand the influence of nucleation and growth mechanism during the crystallization steps, samples are heated in isothermal conditions at various annealing temperatures in supercooled liquid region to determine the local Avrami’s exponent using Johnson-Mehl-Avrami (JMA) equation. Additionally, small scale mechanical response was noted on metallic glass samples to determine the influence of structure on hardness and elastic modulus. Nanoindentation results showed hardness value of 5.39 ± 0.09 GPa and Young’s modulus of 92.81± 0.52 GPa. © 2023, The Authors. All rights reserved.

关键词： Nanoindentation

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Solid-Liquid Composite Lubricating Coating Based on Thermally Sprayed Ceramic Template: Tribological Properties, Lubrication and Failure Mechanism

SSRN

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SSRN 2024年

作者： He, Jialin He, Nairu He, Chunyan Li, Shuangjian Fan, Xiujuan Wang, Chao Han, Mengyao Deng, Chunming Mao, Jie Zhang, Xiaofeng College of Mechanical and Electrical Engineering Shaanxi University of Science &Technology 710021 China Institute of New Materials Guangdong Academy of Sciences National Engineering Laboratory of Modern Materials Surface Engineering Technology Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology 510651 China School of Materials Science and Engineering South China University of Technology Guangzhou510640 China School of Construction Machinery Chang’an University Xi’an710064 China

A novel solid-liquid composite lubrication coating was prepared using the inherent pores and micro-cracks of thermally sprayed Al2O3/polyfluoroalkoxy coating. Results suggest that nano-scaled Al2O3 and polyfluoroalkoxy abrasive debris were encapsulated by perfluoropolyether and generated as micro-convex at friction interfaces. The micro-convex exhibits a high adhesion force (119 nN), thereby preventing crack propagation on the worn surface. By creating a micro-convex surface, a minimal friction coefficient of 0.07 is achieved, leading to a reduction in wear rate of approximately 79% when compared to pre-oil immersion conditions and approximately 99% when compared to Al2O3 coatings. Continuous consumption of perfluoropolyether and accumulation of wear debris during sliding leads to gradual destruction of the lubricating micro-convex, ultimately leading to its failure. © 2024, The Authors. All rights reserved.

关键词： Aluminum oxide

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Fabrication and Effect of Gamma (γ) Radiation on Degradable Biocomposite Films Incorporated with Medicinal Plants

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materials Circular Economy 2024年第1期6卷 1-14页

作者： Parveen, Israt Mahmud, Md. Iqbal Das, Subrata C. Khan, Ruhul A. Cho, Haeng M. Institute for Frontier Materials Deakin University VIC Australia Department of Textile Engineering Mawlana Bhashani Science and Technology University Tangail Bangladesh Institute of Radiation and Polymer Technology Atomic Energy Research Establishment Bangladesh Atomic Energy Commission Savar Bangladesh Department of Mechanical Engineering Mawlana Bhashani Science and Technology University Tangail Bangladesh Department of Manufacturing and Civil Engineering Norwegian University of Science and Technology Gjøvik Norway Department of Mechanical Engineering Kongju National University Gongju South Korea

In this work, degradable biocomposite films were developed from sodium alginate (SA) biopolymer and the leaves of two naturally available medicinal plants, i.e., neem (Azadirachta indica) and aloe vera (Aloe barbadensis Miller), for biomedical application purposes. The solvent-casting method was used to fabricate the films, and 1 wt% of the medicinal plant leaf extract was employed during the film casting. Various characterization was performed to assess the performances of the developed biocomposite films, such as tensile testing, moisture content, FTIR (Fourier transform infrared) spectroscopy, TGA (thermogravimetric analysis), SEM (scanning electron microscopy), and biodegradation (in soil medium) testing. Furthermore, gamma (γ) radiation of 6.0 kGy dose was applied to boost up the performance of the studied films. A positive response in the physico-mechanical properties was exhibited as a function of γ-ray exposure in the biocomposite films. The studied films exhibited high transparency and have the potential to be applied as useful material for biomedical applications such as wound dressing, and antimicrobial bandages.

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Recent Progress in Improving Rate Performance of Cellulose-Derived Carbon materials for Sodium-Ion Batteries

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Nano-Micro Letters 2024年第8期16卷 102-147页

作者： Fujuan Wang Tianyun Zhang Tian Zhang Tianqi He Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non‑Ferrous Metals Lanzhou University of TechnologyLanzhou 730050People’s Republic of China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050People’s Republic of China School of Mechanical and Electronical Engineering Lanzhou University of TechnologyLanzhou 730050People’s Republic of China

Cellulose-derived carbon is regarded as one of the most promising candidates for high-performance anode materials in sodium-ion batteries;however,its poor rate performance at higher current density remains a challenge to achieve high power density sodium-ion *** present review comprehensively elucidates the structural characteristics of cellulose-based materials and cellulose-derived carbon materials,explores the limitations in enhancing rate performance arising from ion diffusion and electronic transfer at the level of cellulose-derived carbon materials,and proposes corresponding strategies to improve rate performance targeted at various precursors of cellulose-based *** review also presents an update on recent progress in cellulose-based materials and cellulose-derived carbon materials,with particular focuses on their molecular,crystalline,and aggregation ***,the relationship between storage sodium and rate performance the carbon materials is elucidated through theoretical calculations and characterization ***,future perspectives regarding challenges and opportunities in the research field of cellulose-derived carbon anodes are briefly highlighted.

关键词： Cellulose Hard carbon Anode materials Rate performance Sodium-ion batteries

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engineering hierarchical heterostructure material based on metal-organic frameworks and cotton fiber for high-efficient microwave absorber

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Nano Research 2022年第8期15卷 6841-6850页

作者： Yan Guo Hu Liu Dedong Wang Zeinhom M.El-Bahy Jalal T.Althakafy Hala M.Abo-Dief Zhanhu Guo Ben Bin Xu Chuntai Liu Changyu Shen Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt Department of Chemistry Faculty of Applied ScienceUmm Al-Qura UniversityMecca 21955Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA Department of Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon TyneNE18STUK

Rational construction of hierarchical multi-component materials with abundant heterostructure is evolving as a promising strategy to achieve excellent metal-organic frameworks(MOFs)based electromagnetic wave(EMW)***,hierarchical heterostructure WS_(2)/CoS_(2)@carbonized cotton fiber(CCF)was fabricated using the ZIF-67 MOFs nanosheets anchored cotton fiber(ZIF-67@CF)as a precursor through the tungsten etching,sulfurization,and carbonization *** from the synergetic effect of dielectric-magnetic dual-loss mechanism,the hierarchical heterostructure and multicomponent of WS_(2)/CoS_(2)@CCF also display improved impedance ***,numerous W-S-Co bands and heterojunction interfaces of heterogeneous WS_(2)/CoS_(2)are beneficial to promoting additional interfacial/dipole polarization loss and conductive loss,thereby enhancing the EMW attenuation *** on the percolation theory,a good balance between impedance matching and EMW absorption capacity was achieved for the WS_(2)/CoS_(2)@CCF/paraffin composite with 20 wt.%filler loading,exhibiting strong EMW absorption capability with a minimum reflection loss(RLmin)value of−51.26 dB at 17.36 GHz with 2 mm thickness and a maximum effective absorption bandwidth(EABmax)as wide as 6.72 *** research will provide new guidance for designing high-efficient MOFs derived EMW absorbers.

关键词： hierarchical heterostructure sulfurization metal-organic framework microwave absorber

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Mussel-Inspired and Bioclickable Peptide Engineered Surface to Combat Thrombosis and Infection

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Research 2022年第3期2022卷 91-104页

作者： Xiaohui Mou Hongbo Zhang Hua Qiu Wentai Zhang Ying Wang Kaiqin Xiong Nan Huang Hélder A.Santos Zhilu Yang Affiliated Dongguan Hospital Southern Medical UniversityDongguanGuangdong 523059China Guangdong Provincial Key Laboratory of Shock and Microcirculation GuangzhouGuangdong 510080China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Pharmaceutical Sciences Laboratory Åbo Akademi UniversityTurku Biosciences CenterUniversity of Turku andÅbo Akademi University20520 TurkuFinland State Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai 200438China Department of Biomedical Engineering and W.J.Kolff Institute for Biomedical Engineering and Materials Science University Medical Center Groningen/University of GroningenAnt.Deusinglaan 19713 AV GroningenNetherlands Drug Research Program Division of Pharmaceutical Chemistry and TechnologyFaculty of PharmacyUniversity of HelsinkiFI-00014 HelsinkiFinland

Thrombosis and infections are the two major complications associated with extracorporeal circuits and indwelling medical devices,leading to significant mortality in *** address this issue,here,we report a biomimetic surface engineering strategy by the integration of mussel-inspired adhesive peptide,with bio-orthogonal click chemistry,to tailor the surface functionalities of tubing and *** by mussel adhesive foot protein,a bioclickable peptide mimic(DOPA)4-azidebased structure is designed and grafted on an aminated tubing robustly based on catechol-amine ***,the dibenzylcyclooctyne(DBCO)modified nitric oxide generating species of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid(DOTA)chelated copper ions and the DBCO-modified antimicrobial peptide(DBCO-AMP)are clicked onto the grafted surfaces via bio-orthogonal *** combination of the robustly grafted AMP and Cu-DOTA endows the modified tubing with durable antimicrobial properties and ability in long-term catalytically generating NO from endogenous snitrosothiols to resist adhesion/activation of platelets,thus preventing the formation of ***,this biomimetic surface engineering technology provides a promising solution for multicomponent surface functionalization and the surface bioengineering of biomedical devices with enhanced clinical performance.

关键词： DOTA generating Engine

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Phase Prediction, Microstructure and mechanical Property of Spark Plasma Sintered Titanium Aluminide-Based High-Entropy Alloys

SSRN

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SSRN 2024年

作者： Anamu, Ufoma Silas Ayodele, O.O. Olorundaisi, Emmanuel Odetola, P.I. Jen, T.-C. Olubambi, Peter Apata Centre for Nanoengineering and Advanced Materials School of Mining Metallurgy and Chemical Engineering University of Johannesburg Johannesburg2092 South Africa Department of Mechanical Engineering Science University of Johannesburg South Africa

Four novel septenary high-entropy alloys (HEAs) were developed as follows: an equiatomic Ti14.286Al14.286Cr14.286Nb14.286Ni14.286Cu14.286Co14.286 (A), Ti20Al20Cr5Nb5Ni19Cu12Co19 (B), Ti20Al20Cr5Nb5Ni18Cu14Co18 (C) and Ti20Al20Cr5Nb5Ni17Cu16Co17 (D) alloys. The HEAs were designed theoretically by thermo-physical calculations and CALPHAD-based tool (Thermo-Calc) to predict the thermodynamic properties and the phases’ stability in the alloys prior to the experimentation process. After high-energy ball-milling of the elemental powders at 10 hrs milling time, spark plasma sintering (SPS) technique was employed for the fabrication of the HEAs at a sintering temperature of 900 oC, heating rate of 100 oC/min, pressure of 50 MPa, and a dwelling time of 5 min. X-ray diffractometer, scanning electron microscope, and Vickers micro-hardness tester were used to investigate the distinct phase constituents, microstructures and hardness property of the fabricated HEAs. The ThermoCalc simulation reveals the presence of primarily five stable phases, namely- BCC(B2), FCC(L12), Sigma, Heusler and C15(Laves). High consolidation and appropriate inter-particle bonding of the admixed powder aggregate, and equiaxed crystal structure was observed in the SPSed HEAs depicted in the micrographs. Alloy B exhibits an optimum micro-hardness of 859 HV/0.3, with a nano crystallite size of 10.3764 µm and, a micro-strain value of 0.3045. An increase in the composition of the Cu at the expense of Ni and Co stabilizes the FCC structure, and this translates to a subsequent decrease in the hardness value from alloy B to D. A comparison of the phases and micro-hardness results from the experimental procedure follows a similar trend with that obtained from the Thermo-Calc simulation. © 2024, The Authors. All rights reserved.

关键词： Spark plasma sintering

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Chemically synthesizing exchange-coupled SmCo_(5)/Sm_(2)Co_(17) nanocomposites

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Rare Metals 2021年第3期40卷 575-581页

作者： Yao-Hui Xu Qiang Jiang Kun Li Zhen-Hui Ma School of Physics and Electronic Engineering Laboratory for Functional MaterialsLeshan Normal UniversityNanjing 211189China Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing 211189China College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China Department of Chemistry Brown UniversityProvidenceRI 02912USA

A new strategy to chemically synthesize exchange-coupled SmCo_(5)/Sm_(2) Co_(17) nanocomposites by in situ decomposition of SmCox(5<x<8.5)is reported in this *** synthesis starts with the fabrication of Co/Sm_(2... 详细信息

A new strategy to chemically synthesize exchange-coupled SmCo_(5)/Sm_(2) Co_(17) nanocomposites by in situ decomposition of SmCox(5

关键词： SmCo_(5) Nanocomposites Exchange coupling Coercivity

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