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Gradient layered MXene/Fe_(3)O_(4)@CNTs/TOCNF ultrathin nanocomposite paper exhibiting effective electromagnetic shielding and multifunctionality

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Nano Research 2024年第9期17卷 8233-8242页

作者： Zhengkun Ma Jingzong He Shilin Liu Xiaoxuan Qie Meiheng Gan Ruonan Cheng Qilin Wu Malcolm Xing State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China College of Chemistry and Chemical Engineering Donghua UniversityShanghai 201620China Department of Mechanical Engineering University of ManitobaWinnipegMB R3T 2N2Canada

As wearable electronic devices are rapidly developing,there is an urgent need for lightweight,flexible,and ultrathin multifunctional electromagnetic interference(EMI)shielding ***,the flexible ultrathin paper that combines efficient shielding and multifunctional integration remains a considerable ***,a novel MXene/Fe_(3)O_(4)@CNTs/TOCNF(MCT,MXene=transition metal carbide/carbonitride,CNTs=carbon nanotubes,TOCNF=TEMPO-oxidized cellulose nanofiber,TEMPO=2,2,6,6-tetramethylpiperidine-1-oxyl radical)nanocomposite paper with a multilayer electromagnetic gradient structure and electromagnetic dual losses was successfully prepared by a simple filtration *** from effective gradient design and adjusting the proportion of TOCNF,the composite paper(only 18μm)exhibits outstanding shielding effectiveness(SE)of 66 dB in the X-band,ultrahigh thickness-specific SE and surface-specific SE values of 3300 dB·mm-1 and 31,428 dB·cm^(2)·g^(-1)***,dehydroxylation treatment improves MCT paper's hydrophobicity,environmental stability,and mechanical strength,expanding its range of ***,the highly efficient Joule heating properties and hydrophobicity provide MCT additional de-icing *** also simulated the electromagnetic shielding effects of MCT composite paper,which was applied in *** study documents an innovative and intriguing material combination,providing a simple and effective manufacturing strategy for developing EMI shielding *** paper is highly suitable for outdoor portable or wearable electronic devices and has significant application potential in humid/severe cold environments.

关键词： cellulose fiber thin papers nanocomposites electromagnetic interference(EMI)shielding

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Microstructure, thermal stability and corrosion behavior of ultrasonic shot peened AA7034

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Corrosion Communications 2023年第2期10卷 48-55页

作者： Hao Liu Jiabo Chen Shuai Wang Bo Du Fahe Cao Qingqing Sun School of Materials Sun Yat-sen University Department of Mechanical and Energy Engineering Southern University of Science and Technology

Microstructure, thermal stability at room temperature and corrosion behavior of ultrasonic shot peened AA7034were investigated in this work. Microstructure modification induced by ultrasonic shot peening was obtained by using OM, SEM, EBSD and XRD, and it was found that a ～200 μm thick gradient surface layer with nanoscale grains on the topmost layer was induced on the peened sample. XRD peaks of the pre-existing aginginduced precipitates, i.e., η′ and η phases, disappeared after peening and did not show up during 52 monthslong natural aging treatment, showing good thermal stability at room temperature. After peening, a significant improvement in intergranular corrosion resistance is evident. Electrochemical characterizations like open circuit potential and electrochemical impedance spectroscopy were conducted on various depths of the peened sample and the results indicated that uniform corrosion rate was largely accelerated by the presence of foreign Ferich contamination, implying that modifications should be made to reduce/avoid the foreign ***, mechanisms of corrosion improvement and good thermal stability of the nanocrystalline surface layer of AA7304 are also discussed.

关键词： 7034 aluminum alloy Surface nanocrystallization Corrosion behavior Thermal stability

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Real-Time Detection of Sub-ppm Aromatic Compounds in Alcohol by Surface Plasmon Resonance Using Label-Free Graphene

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Energy & Environmental materials 2025年第1期8卷 142-150页

作者： Sung Hwan Cho Jun Min Suh Wontaek Kim Jaehyun Kim Yeong Jae Kim Tae Hyung Lee Jae Young Kim Jaegun Sim Seung Won Choi Byung Hee Hong So Young Kim Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Korea Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Infra Analysis Team Global Manufacturing&Infra TechnologySamsung ElectronicsHwaseong 18448Korea Department of Chemistry Seoul National UniversitySeoul 08826Korea

The increasing importance of high-purity isopropyl alcohol(IPA)in semiconductor processing technology has led to a higher demand for technologies capable of detecting impurities in *** accurate and various impurity detection technologies have been developed,most of them have limitations in real-time and repeatable detection of ***,for the first time,surface plasmon resonance(SPR)sensor was developed utilizing graphene transferred Au film(Au/graphene)to detect sub-ppm levels of 2,4-dinitrophenol(2,4-DNP)dissolved in IPA and this sensor demonstrates the ability to detect 2,4-DNP in real-time with great *** adsorption of 2,4-DNP to graphene is found to be stronger than that for Au film because of noncovalent graphene p–p stacking interaction,and the effect of graphene is demonstrated through density function theory(DFT)calculations and enhancement in sensing performance of Au/graphene ***,the presence of noncovalent p–p stacking interaction between 2,4-DNP and graphene has been demonstrated by confirming the p-doping effect of graphene-based solution field-effect transistor measurements and consecutive Raman spectra *** study offers experimental and theoretical insights into the adsorption kinetics of 2,4-DNP dissolved in IPA and provides promising perspectives for real-time sensing technology utilizing label-free graphene to detect impurities in high-purity cleaning agents.

关键词： density functional theory graphene liquid sensor surface plasmon resonance p-p stacking interaction

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Characterization of the asymmetric evolving yield and flow of 6016-T4 aluminum alloy and DP490 steel

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Journal of materials science & Technology 2023年第2期133卷 209-229页

作者： Kai Du Shaohui Huang Yong Hou Haibo Wang Yinxiao Wang Wentao Zheng Xiaoguang Yuan School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Department of Technical Planning Press Shop BMW Brilliance Automotive Ltd.Shenyang 100044China Department of Materials Science and Engineering&RIAM Seoul National UniversitySeoul 08826Republic of Korea School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

6016-T4 aluminum alloy and DP490 steel were systematically tested under 24 proportional loading paths,including uniaxial tensile tests with a 15°increment,uniaxial compressive and simple shear tests with a 45°increment,and biaxial tensile tests using cruciform *** specimens in the rolling/transverse and 45°/135°sampling directions were tested with seven and four different stress ra-tios,*** normal and diagonal planes plastic work contours and the yield stresses under uniaxial tension and compression were measured to investigate the anisotropic ***,the normal and diagonal planes directions of plastic strain rate and the rα-values under uniaxial tension and compression were characterized to confirm the plastic *** existing asymmetric yield crite-ria under the associated and non-associated flow rules were comprehensively evaluated to describe the asymmetric plastic anisotropy of 6016-T4 aluminum alloy and DP490 *** results suggest that in the investigated yield criteria,the non-associated models can predict the tension and compression asym-metry of materials more accurately than the associated models,and the function of stress triaxiality can more effectively describe the asymmetric yield behavior than the first stress *** addition,the pure shear stress states are helpful in assessing the validity and applicability of advanced asymmetric yield stress functions,and the inspection of diagonal plane plastic work contours containing more pure shear stress states should prioritized over that of normal plane plastic work *** evaluation of plastic potential functions should not only consider the prediction accuracy of the normal plane di-rections of plastic strain rate,but also further check the diagonal plane directions of plastic strain *** mechanical properties as a function of equivalent plastic strain to calibrate parameters of the yield criterion allows the continuous capture of anisot

关键词： Proportional loading paths Diagonal plane Asymmetric yield criterion Non-associated flow rule Anisotropic hardening Sheet metal forming

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A low-cost and high-strength basalt/carbon fiber reinforced polymer improved by imitating tree-root micro/nano aramid short fiber

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Chinese Journal of Aeronautics 2024年第10期37卷 526-538页

作者： Guangming YANG Yanan LYU Fei CHENG Jiaxin HE Shihao ZUO Wenyi HUANG Yunsen HU Xiaozhi HU Xi CHEN Shock and Vibration of Engineering Materials and Structures Key Lab of Sichuan Province Southwest University of Science and TechnologyMianyang 621010China Engineering Research Center of Biomass Materials Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China School of Materials and Chemistry Southwest University of Science and TechnologyMianyang 621010China Institute of Automation Chinese Academy of SciencesBeijing 100190China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100101China School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Department of Mechanical Engineering University of Western AustraliaPerth 6009Australia

The high-strength Basalt Carbon Fiber Reinforced Polymer(BCFRP)composites had been manufactured by guiding Imitating Tree-root Micro/Nano Aramid Short Fiber(ITMNASF)into the interlayer of Basalt Fiber(BF)and Carbon Fiber(CF)plies to form thin interleaving,and various mass proportions of IT-MNASF were designed to discuss the reinforcing effect on the BCFRP heterogeneous *** results of three points bending tests showed that flexural strength and energy absorption of 4wt%IT-MNASF reinforced BCFRP heterogeneous composites had been improved by 32.4%and 134.4%respectively compared with that of unreinforced *** 4wt%IT-MNASF reinforced BCFRP specimens showed both a greater strength and a lower cost(reduced by 31%around)than that of plain CFRP composites.X-ray micro-computed tomography scanning results exhibited that the delamination-dominated failure of plain BCFRP composites was changed into multi-layer BF and CF fabrics *** reinforcing mechanism revealed that the introduced IT-MNASF could construct quasi-vertical fiber bridging,and it was used as"mechanical claws"to grasp adjacent fiber layers for creating a stronger mechanical interlocking,and this effectively improved resin-rich region and interfacial transition region at the *** simple and effective IT-MNASF interleaving technique was very successful in low-cost and high-strength development of BCFRP heterogeneous composites.

关键词： Basalt carbon fiber reinforced polymer Micro/nano aramid fiber Fiber bridging Strength improvement Low-cost substitution

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Coupling metal-organic frameworks and wood-based carbon for water remediation

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Nano Research 2024年第6期17卷 5661-5669页

作者： Akhter Zia Manish Neupane Aidan McGlone Rui He Ruikun Xin Yifeng Liu Qiangu Yan Jinwu Wang Ling Li Zhiyong Cai Pei Dong Yingchao Yang Department of Mechanical Engineering University of MaineOronoME 04469USA Department of Mechanical and Aerospace Engineering University of MissouriColumbiaMO 65211USA Department of Mechanical Engineering George Mason UniversityFairfaxVA 22030USA Department of Civil and Environmental Engineering Rice UniversityHoustonTX 77005USA Department of Materials Science and NanoEngineering Rice UniversityHoustonTX 77005USA Forest Products Laboratory USDAMadisonWI 53726USA School of Forestry Resources University of MaineOronoME 04469USA

Fresh and clean water is highly demanded throughout the *** effectively address the need,nanomaterials enabled nanotechnology has been explored as a means of more efficient,reliable,and environmentally friendly approach towards water treatment *** concern in adopting nanomaterials is how to retrieve them from water body to avoid secondary *** this work,the earth abundant and sustainable wood,e.g.,basswood,was selected and carbonized into porous carbon as host skeleton,and metal-organic frameworks(MOFs),e.g.,MOF-199 with extremely high surface area,were grown throughout all channels in the porous basswood *** the traditional organic pollutant,methyl orange(MO),the combination of MOFs and basswood carbon(MOFs@carbon)demonstrates a remarkable adsorption capacity,which is 243%and 454%higher than basswood carbon and MOF-199,*** an outstanding adsorption performance originates from that the positively charged carbon pulls MO molecules close to carbon surface,leading to a high MO molecule concentration,and then the concentration gradient drives the MO molecules to be stored inside MOFs,functioning like *** findings highlight the potential application of coupled MOFs and biomass carbon in addressing water remediation.

关键词： metal-organic framework(MOF)-199 basswood carbon MOFs@carbon methyl orange

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An interpretable deep learning approach for designing nanoporous silicon nitride membranes with tunable mechanical properties

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npj Computational materials 2023年第1期9卷 1524-1533页

作者： Ali KShargh Niaz Abdolrahim Department of Mechanical Engineering University of RochesterRochesterNY 14627USA Materials Science program University of RochesterRochesterNY 14627USA Laboratory for Laser Energetics University of RochesterRochesterNY 14627USA

The high permeability and strong selectivity of nanoporous silicon nitride(NPN)membranes make them attractive in a broad range of *** their growing use,the strength of NPN membranes needs to be improved for further extending their biomedical *** this work,we implement a deep learning framework to design NPN membranes with improved or prescribed strength *** examine the predictions of our framework using physics-based *** results confirm that the proposed framework is not only able to predict the strength of NPN membranes with a wide range of microstructures,but also can design NPN membranes with prescribed or improved *** simulations further demonstrate that the microstructural heterogeneity that our framework suggests for the optimized design,lowers the stress concentration around the pores and leads to the strength improvement of NPN membranes as compared to conventional membranes with homogenous microstructures.

关键词： tunable prescribed strength

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Fast water transport and ionic sieving in ultrathin stacked nanoporous 2D membranes

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National science Review 2025年第3期12卷 316-324页

作者： Jingfeng Wang Xiaoming Zhang Zehua Yu Yuyan Gao Qingqing Lu Chao Ma Kang Liu Quan Yuan Yanbing Yang College of Chemistry and Molecular Sciences Key Laboratory of Biomedical Polymers of Ministry of Education School of Power and Mechanical Engineering Institute of Molecular Medicine Renmin Hospital of Wuhan University School of Microelectronics Wuhan University Department of Engineering Science and Mechanics The Pennsylvania State University Molecular Science and Biomedicine Laboratory (MBL) State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering College of Materials Science and Engineering Hunan University

Atomically thin nanoporous 2D membranes, featuring unique sieving characteristics for molecules and ions,have significant potential for seawater desalination. However, they face a common trade-off between permeability and selectivity. Here, we report an ultrathin stacked nanoporous graphene membrane(SNGM) created by layering atomically thin graphene nanomesh. This design achieves highly efficient and selective sieving of water molecules and ions. The SNGMs showcase in-plane nanopores for optimal size-exclusive water input and output, and interlayer 2D nanochannels between adjacent graphene nanomesh membranes for rapid water transport and precise ion/molecular sieving. The resulting SNGMs effectively address the trade-off between water permeability and ion selectivity in conventional desalination membranes, delivering a water permeability of ～ 1–2 orders of magnitude higher than that of commercial membranes, while maintaining a comparable ion rejection ratio(>95% for Na Cl). This advance marks a significant leap forward in adopting 2D nanoporous membranes for desalination technology.

关键词： stacked structure membranes layer water transport ionic sieving

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FE Analysis of Additive Manufacturing of Al Magnetic Shield for EV Wireless Charging

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Journal of The Institution of Engineers (India): Series D 2024年第3期105卷 1763-1770页

作者： Santhosh Kumar, S. Datta, Shubhabrata Center for Composites and Advanced Materials Department of Mechanical Engineering SRM Institute of Science and Technology Kattankulathur Chengalpattu district Tamil Nadu 603204 India

The present study describes the finite element analysis of additive manufacturing of an electric vehicle component, a magnetic shield for wireless charging using aluminum alloy. Metal additive manufacturing involves making substantial and complex components layer by layer using laser powder bed fusion process. The AlSi10Mg alloy is used here as the material for the simulation of the process for the designed component. The drawback of the laser powder bed fusion process is the emergence of thermal residual stress resulting from sudden heating and cooling. This research aims to reduce this residual stress and part distortion with the help of finite element simulation, varying the machine parameters, viz. laser beam diameter, laser power, powder layer thickness, laser scan speed, and hatch distance. The Ansys Additive print software is used for the present simulation. Based on the simulation result, we found an optimized Al magnetic shield machine parameter that reduces the residual stress and part deformation. The optimized machine parameters are found to be scanning speed of 2000 mm/s, layer thickness of 50 μm, laser power of 350 W, laser beam diameter of 100 μm and hatch spacing of 200 μm. © The Institution of Engineers (India) 2023.

关键词： Finite element method

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Highly Flexible and Self-Healable Electronic Skin 23

Highly Flexible and Self-Healable Electronic Skin

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23rd International Conference on Composite materials, ICCM 2023

作者： Hong, Sung Hwa Shi, Harvey HaoTian Wang, Guorui Filleter, Tobin Naguib, Hani E. Department of Mechanical and Industrial Engineering Department of Materials Science and Engineering University of Toronto ON Canada

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