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Aggregate 2024年第6期5卷 447-459页

作者： Siheng Wang Lei Zhang Zhuomin Wang Zhanqian Song He Liu Ziqi Tian Xu Xu Key Laboratory of Biomass Energy and Material Jiangsu Province/Key Laboratory of Chemical Engineering of Forest ProductsNational Forestry and Grassland Administration/National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass/Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesInstitute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjingChina Jiangsu Co–Innovation Center of Efficient Processing and Utilization of Forest Resources College of Chemical EngineeringNanjing Forestry UniversityNanjingChina Zhejiang Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboChina

Poly(vinyl alcohol)(PVA)is biodegradable,recyclable,and has high tensile ***,it is ideal for the development of environment-friendly sustainable ***,at elevated humidity,the mechanical properties of PVA bioplastic films undergo degradation owing to their intrinsic hydrophilic and hygroscopic nature,hindering their *** study proposes a nanoconfined assembly strategy to produce humidity-adaptive,mechanically robust,and recyclable bioplastic *** strong hydrogen bonds between PVA and cellulose nanofibrils inhibit the penetration of water molecules into the film to promote humidity ***,the robust coordination interactions between bentonite nanoplates,PVA,and cellulose nanofibrils restrict the slip of polymer chains during deformation,leading to enhanced mechanical *** from the nanoconfined assembly architecture in aggregated composites,the resulting reinforced PVA film simultaneously exhibits strength,stiffness,toughness,fracture energy,and tearing energy of 55.9 MPa,1,275.6 MPa,162.9 MJ m^(−3),630.9 kJ m^(−2),and 465.0 kJ m^(−2),***,the film maintains a strength of approximately 48.7 MPa even at 80%relative humidity for 180 *** efficient design strategy applies to diverse scales and structured cellulose ***,it facilitates the application of recyclable high-performance bioplastic films to settings that require high humidity tolerance.

关键词： aggregated composites humidity-adaptive plastics mechanically robust nanoconfined recyclable bioplastic films

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High-performance flexible nanocomposites with superior fire safety and ultra-efficient electromagnetic interference shielding

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Journal of materials Science & Technology 2023年第35期166卷 133-144页

作者： Miao Liu Kexin Chen Yongqian Shi Hengrui Wang Shijie Wu Ruizhe Huang Yuezhan Feng Longcheng Tang Xiaohuan Liu Pingan Song College of Environment and Safety Engineering Fuzhou UniversityFuzhou 350116China Key Laboratory of Materials Processing and Mold Ministry of Education National Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education College of MaterialChemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou 311121China College of Life Science Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhou 318000China Centre for Future Materials University of Southern QueenslandSpringfieldQLD 4300Australia School of Agriculture and Environmental Science University of Southern QueenslandSpringfield4300Australia

High-performance multifunctional polymeric materials integrated with high fire safety,excel-lent mechanical performances and electromagnetic interference(EMI)shielding properties have great prospects in practical ***,designing highly fire-safe and mechanically ro-bust EMI shielding nanocomposites remains a great ***,hierarchical thermoplastic polyurethane/cyclophosphazene functionalized titanium carbide/carbon fiber fabric(TPU/CP-Ti_(3)C_(2)T_(x)/CF)nanocomposites with high fire safety and mechanical strength and toughness were prepared through the methods of melt blending,layer-by-layer stacking and *** TPU/CP-Ti_(3)C_(2)T_(x)showed improved thermal ***,the peak of heat release rate and total heat release of the hi-erarchical TPU sample containing 4.0 wt.%CP-Ti_(3)C_(2)T_(x)were respectively reduced by 64.4%and 31.8%relative to those of pure TPU,which were far higher than those of other TPU-based *** averaged EMI shielding effectiveness value of the hierarchical TPU/CP-Ti_(3)C_(2)T_(x)-2.0/CF nanocomposite reached 30.0 dB,which could satisfy the requirement for commercial ***,the ten-sile strength of TPU/CP-Ti_(3)C_(2)T_(x)-2.0/CF achieved 43.2 MPa,and the ductility and toughness increased by 28.4%and 84.3%respectively compared to those of TPU/*** hydrogen bonding in combination with catalytic carbonization of CP-Ti_(3)C_(2)T_(x)nanosheets and continuous conductive network of CF were re-sponsible for the superior fire safety,excellent EMI shielding and outstanding mechanical *** work offers a promising strategy to prepare multifunctional TPU-based nanocomposites,which have the potential for large-scale application in the fields of electronics,electrical equipment and 5 G facilities.

关键词： Hierarchical structure Fire safety Electromagnetic interference shielding Mechanical strength and toughness Air assisted thermocompression

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Mn,N co-doped Co nanoparticles/porous carbon as air cathode for highly efficient rechargeable Zn-air batteries Hide Author's Information

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Nano Research 2022年第3期15卷 1942-1948页

作者： Hanzhen Zheng Fei Ma Hongcen Yang Xiaogang Wu Rui Wang Dali Jia Zhixia Wang Niandi Lu Fen Ran Shanglong Peng National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals School of Material Science and EngineeringLanzhou University of TechnologyLanzhou 730050China

Oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)are generally catalyzed by precious metals(Pt)and metal oxides(IrO_(2))which still have many shortages including expensive price,poor selectivity and undesirable *** this work,we report a Mn0-doped CoN_(x) on N-doped porous carbon(Mn-CoN_(x)/N-PC)composite from carbonizing metal-organic framework(MOF)derivative as the dual-functional catalyst to boost both the ORR and OER *** to the strong coordination effect between nitrogen and metal elements,the introduction of N can obviously improve the content of Co-N-C active sites for ***,the Mn-doping significantly regulates the electronic structure of the Co element and increases the content of Co^(0) which provide efficient OER active ***-CoN_(x)/N-PC catalyst delivers super dual-functional activity with a half-wave potential of 0.85 V,better than the 20%Pt/C catalyst(0.82 V).When used in Zn-air batteries for testing,Mn-CoN_(x)/N-PC electrocatalyst shows a high power density(145 mW·cm^(−2))and good cycle performance.

关键词： bifunctional electrocatalysts Co-N-C Mn-doped Zn-air batteries

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Energy Storage Mechanism of Vanadium Nitride via Intercalating Different Atomic Radius for Expanding Interplanar Spacing

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Energy & Environmental materials 2022年第2期5卷 565-571页

作者： Ying Liu Lingyang Liu Long Kang Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals School of Material Science and EngineeringLanzhou University of TechnologyLanzhou 730050China Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China

As a promising anode material in supercapacitors,vanadium nitride has been widely concerned due to its ultra-high theoretical specific ***,its routine test capacitance value is still far from the theoretical value and its energy storage mechanism is *** order to solve these two key problems,here we prepare interplanar spacing expanded vanadium nitride materials with different impurity atoms intercalation from two anionic precursors of vanadium-based metal organic frameworks with different functional *** obtained vanadium nitride reaches a higher specific capacitance;and further,through ex situ X-Ray diffraction and in situ Raman,the charge storage of vanadium nitride is contributed by two processes:the first benefit is from the K^(+) de/intercalation in the interplanar spacing,and the other one is derived from the redox reaction with OH−by adsorption on ***,both of the first principle calculation and extended experiments support this *** believe that such detailed research on the energy storage mechanism can provide a clear idea for the application of metal nitrides in supercapacitors and other energy storage devices.

关键词： electrode materials energy storage mechanism supercapacitors vanadium nitride V-MOFs

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Tailoring lithium intercalation pathway in 2D van der Waals heterostructure for high-speed edge-contacted floating-gate transistor and artificial synapses

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InfoMat 2024年第10期6卷 53-64页

作者： Jun Yu Jiawei Fu Hongcheng Ruan Han Wang Yimeng Yu Jinpeng Wang Yuhui He Jinsong Wu Fuwei Zhuge Ying Ma Tianyou Zhai State Key Laboratory of Materials Processing and Die and Mould Technology School of Material Science and EngineeringHuazhong University of Science and Technology(HUST)Wuhanthe People's Republic of China Hubei Yangtze Memory Laboratory School of Integrated CircuitsHuazhong University of Science and Technology(HUST)Wuhanthe People's Republic of China School of Information Engineering Zhongnan University of Economics and LawWuhanthe People's Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CenterWuhan University of TechnologyWuhanthe People's Republic of China Optics Valley Laboratory Hubeithe People's Republic of China

Local phase transition in transition metal dichalcogenides (TMDCs) by lithiumintercalation enables the fabrication of high-quality contact interfaces in twodimensional(2D) electronic devices. However, controlling the intercalation oflithium is hitherto challenging in vertically stacked van der Waalsheterostructures (vdWHs) due to the random diffusion of lithium ions in thehetero-interface, which hinders their application for contact engineering of 2DvdWHs devices. Herein, a strategy to restrict the lithium intercalation pathwayin vdWHs is developed by using surface-permeation assisted intercalationwhile sealing all edges, based on which a high-performance edge-contact MoS_(2)vdWHs floating-gate transistor is demonstrated. Our method avoids intercalationfrom edges that are prone to be random but intentionally promotes lithiumintercalation from the top surface. The derived MoS_(2) floating-gatetransistor exhibits improved interface quality and significantly reduced subthresholdswing (SS) from >600 to 100 mV dec^(–1). In addition, ultrafast program/erase performance together with well-distinguished 32 memory statesare demonstrated, making it a promising candidate for low-power artificialsynapses. The study on controlling the lithium intercalation pathways in 2DvdWHs offers a viable route toward high-performance 2D electronics for memoryand neuromorphic computing purposes.

关键词： 2D vdW heterostructure high-speed floating-gate transistor interlayer lithium intercalation engineering phase-engineered contact

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Fabrication and Characterization of Pressure Sensors Based on Xanthan Gum and Pullulan 16

Fabrication and Characterization of Pressure Sensors Based o...

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16th Textile Bioengineering and Informatics Symposium, TBIS 2023

作者： Zhang, Ya-Qi Liu, Shi-Yao Tao, Yong-Zhen State Key Laboratory for Textile Materials and Advanced Processing Technology Wuhan Textile University Wuhan China College of Material Science and Engineering Wuhan Textile University Wuhan China

ISBN: (纸本)9781713879473

Conductive hydrogels based on biopolymers have potential applications in the field of wearable devices, implantable devices, and human-machine interfaces due to their biocompatibility as well as conductivity. However, hydrogels are prone to water loss under dry atmospheres. In this paper, a biopolymer-based pressure sensor with water retention was designed. Xanthan gum (XG) and pullulan (P) were cross-linked with sodium trimetaphosphate (STMP) to prepare XG5-P-STMP, and polyethylene glycol with a molecular weight of 200 (PEG200) was added into hydrogels to improve moisture retention. The mechanical properties of the hydrogels were investigated by rheologic measurements such as time sweep, frequency sweep, and strain sweep. The results showed that the addition of PEG200 enhanced strength and moisture retention of the hydrogels, and high PEG200 content hindered the recovery property of the hydrogels. Furthermore, the XG5-P-PEG-STMP hydrogel with ionic conductivity and recoverability was explored as a pressure sensor, and the resistance change ratio exhibited repeatable profile. This work provides some valuable information for further applications of natural polysaccharides as intelligent flexible elections. © TBIS 2023. All rights reserved.

关键词： Hydrogels

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Trajectory Optimization of Emergency Lane Change via Model Predictive Control Using a 1:10 Remote Control Car Model 9

Trajectory Optimization of Emergency Lane Change via Model P...

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9th International Conference on Business and Industrial Research, ICBIR 2024

作者： Golaz, Thanachot Vessakosol, Passakorn Gonsrang, Sarawut Fakkao, Mahunnop Thai-Nichi Institute of Technology Faculty of Engineering Bangkok Thailand Prince Songkla University Faculty of Engineering Department of Mechanical and Mechatronics Engineering Songkhla Hat Yai Thailand Thai-Nichi Institute of Technology Advanced Material Processing Research Laboratory Faculty of Engineering Bangkok Thailand

ISBN: (纸本)9798350383010

Autonomous vehicle technology holds the potential to significantly improve driving safety and precision, reducing the frequency and severity of road accidents. One of the fundamental features of this technology is the autonomous emergency lane change that enables a vehicle to evade unexpected obstacles rapidly. Accurate trajectory modeling and optimized path planning are crucial to performing this maneuver. This paper aims to evaluate the potential of the Model Predictive Control (MPC) model for vehicle stability control during emergency lane changes. A bicycle model was implemented to simulate the vehicle dynamics within a MATLAB Simulink, creating a closed-loop control system with an MPC controller. A 1:10 scale remote control car was used as the model vehicle. A quintic polynomial equation generated an initial trajectory and temporal yaw angles. Experimental conditions varied by initial longitudinal velocities from 0.5 m/s to 2 m/s, and the MPC model had a control horizon of 10 to 20% of a prediction horizon of 15. Our MPC model successfully generated vehicle trajectories for emergency lane change scenarios. At the longitudinal velocity of 0.5 m/s, the model car accurately followed the predicted trajectory. However, results at the longitudinal velocity of 2.0 m/s indicated divergence from the ideal trajectory, highlighting the impact of critical cornering speed on model performance. In addition, a higher number of control horizons yields a better-predicted trajectory that is close to the quintic polynomial function with a trade-off for limited stability. These findings demonstrate the potential of MPC controllers as optimizers for autonomous vehicles. © 2024 IEEE.

关键词： Bicycles

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Biodegradable Mg alloy modified with bioactive exosomes for cardiovascular stent application

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Journal of Magnesium and Alloys 2024年第12期12卷 4988-5004页

作者： Ya-chen Hou Jing-an Li Chang Cao Chang Su Zhen Qin Ge Zhang Jia-cheng Guo Jun-nan Tang Jin-ying Zhang Shao-kang Guan Department of Cardiology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan 450052China Henan Province Key Laboratory of Cardiac Injury and Repair ZhengzhouHenan 450052China Henan Province Clinical Research Center for Cardiovascular Diseases ZhengzhouHenan 450018China School of Material Science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloy&Key Laboratory of materials processing and mold technology(Ministry of Education) Zhengzhou University100 Science RoadZhengzhou 450001China

Cardiovascular stent has been widely applied to treat cardiovascular disease(CVD),which is the major disease contribution to mortality in the world *** magnesium(Mg)alloys are the encouraging materials in cardiovascular stents benefit from absorbability and ***,the ability of degradation is a double-edged sword for manufacture stent,modifying the surface to decrease the excessive degradation rate and promote the surface endothelialization could expand the prospect of the further *** this work,the biodegradable Mg-Zn-Y-Nd alloy was modified by MgF_(2)and dopamine polymer film(PDA)as the corrosion resistance layer and the bonding layer respectively,and then the exosome,a natural nanoparticle contains m RNAs and proteins,was tailored to give the surface better *** electrochemical test and weight loss test reflected the MgF_(2)-PDA/exosome coating increase the corrosion resistance of the Mg-Zn-Y-Nd *** cytocompatibility data indicated the novel MgF_2-PDA/exosome coating selectively reduced the tumor necrosis factor(TNF-α)expression and ROS release from macrophage,and promoted theα-SMA expression of smooth muscle *** addition,the MgF_(2)-PDA/exosome coating also improved the adhesion,proliferation,CD31 expression and nitric oxide(NO)release of vascular endothelial cells(ECs),all of which contribute to the surface *** the mechanism experiments showed the exosome released from the coating uptake by the ECs and assemble around the lysosome and mitochondria,and the released rate of the exosome on the coating is around 5 to 7 days,indicating excellent multi-functions of MgF_(2)-PDA/exosome coating in cardiovascular stent.

关键词： Mg-Zn-Y-Nd alloy Endothelialization Surface modification MgF_(2)-PDA/exosome coating

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Thin Molten Pool Behaviors in Blue Laser Microjoining Marangoni stress determines the stability of the thin molten pool in blue laser microjoining

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WELDING JOURNAL 2022年第11期101卷 269-280页

作者： Wu, D. Sun, J. Li, Z. Huang, J. Feng, K. Shanghai Key Laboratory of Material Laser Processing and Modification Shanghai Jiao Tong University Shanghai China School of Electromechanical Engineering Guangdong University of Technology Guangzhou China Yibin Innovation Center for Advanced Materials Yibin China

Thin copper materials are difficult to weld using infrared lasers (IR) due to their low energy absorption, A blue laser with a wavelength of 450 nm strongly increases energy absorption and successfully realized the microjoining of a copper material with a thickness of 0.1 mm. The dynamic behaviors of a thin molten pool were investigated by a numerical simulation using a new blue laser heat source model. At both the top and bottom surfaces of the thin molten pool, the liquid metal flowed outward under the driving of Marangoni stress. The stability of the thin molten pool was studied, showing that Marangoni stress promoted the melt-through of the thin molten pool, while the viscous resistant stress, buoyant force, and surface tension pressure had minor influences on it. The Peclet and Marangoni numbers were adopted to predict the stability of the thin molten pool.

关键词： Blue Laser Microjoining Energy Absorption Thin Molten Pool Copper material

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Achieving ultra-broadband electromagnetic wave absorption in high-entropy transition metal carbides (HE TMCs)

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Journal of advanced Ceramics 2022年第4期11卷 545-555页

作者： Weiming ZHANG Huimin XIANG Fu-Zhi DAI Biao ZHAO Shijiang WU Yanchun ZHOU Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhou 450046China Zibo Firststar New Material Incorporated Co. Ltd.Zibo 255000China

Electronic devices pervade everyday life,which has triggered severe electromagnetic(EM)wave *** face this challenge,developing EM wave absorbers with ultra-broadband absorption capacity is critically ***,nano-composite construction has been widely utilized to realize impedance match and broadband ***,complex experimental procedures,limited thermal stability,and interior oxidation resistance are still unneglectable ***,it is appealing to realize ultra-broadband EM wave absorption in single-phase materials with good *** at this target,two high-entropy transition metal carbides(HE TMCs)including(Zr,Hf,Nb,Ta)C(HE TMC-2)and(Cr,Zr,Hf,Nb,Ta)C(HE TMC-3)are designed and synthesized,of which the microwave absorption performance is investigated in comparison with previously reported(Ti,Zr,Hf,Nb,Ta)C(HE TMC-1).Due to the synergistic effects of dielectric and magnetic losses,HE TMC-2 and HE TMC-3 exhibit better impedance match and wider effective absorption bandwidth(EAB).In specific,the exclusion of Ti element in HE TMC-2 endows it optimal minimum reflection loss(RL_(min))and EAB of−41.7 dB(2.11 mm,10.52 GHz)and 3.5 GHz(at 3.0 mm),***,the incorporation of Cr element in HE TMC-3 significantly improves the impedance match,thus realizing EAB of 10.5,9.2,and 13.9 GHz at 2,3,and 4 mm,*** significance of this study lays on realizing ultra-broadband capacity in HE TMC-3(Cr,Zr,Hf,Nb,Ta),demonstrating the effectiveness of high-entropy component design in tailoring the impedance match.

关键词： transition metal carbide(TMC) high-entropy ceramics electromagnetic(EM)wave absorption dielectric and magnetic loss coupling ultra-broadband absorption

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