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Switchable shape memory polymer bio-inspired adhesive and its application for unmanned aerial vehicle landing

Chinese Journal of Aeronautics 2024年第3期37卷 380-390页

作者： Qingsong HE Zefang ZHAO Qiyun ZHONG Siyuan LIU Kai DENG Yongqi LIU Ning ZHANG Zijie ZHAO Fengjiang ZHAN Jianfeng ZHAO Jiangsu Provincial Key Laboratory of Bionic Functional Materials College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Advanced Technology for Small and Medium-Sized UAV Ministry of Industry and Information TechnologyUnmanned Aerial Vehicles Research InstituteNanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory of Mechanics and Control of Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Functional Morphology and Biomechanics Institute of ZoologyKiel UniversityKiel 24098Germany

controlled and switchable adhesion is commonly observed in biological *** recent years,many scholars have focused on making switchable bio-inspired ***,making a bio-inspired adhesive with high adhesion performance and excellent dynamic switching properties is still a challenge.A Shape Memory Polymer Bio-inspired Adhesive(SMPBA)was successfully developed,well realizing high adhesion(about 337 kPa),relatively low preload(about90 kPa),high adhesion-to-preload ratio(about 3.74),high switching ratio(about 6.74),and easy detachment,which are attributed to the controlled modulus and contact area by regulating temperature and the Shape Memory Effect(SME).Furthermore,SMPBA exhibits adhesion strength of80–337 kPa on various surfaces(silicon,iron,and aluminum)with different roughness(Ra=0.021–10.280)because of the conformal contact,reflecting outstanding surface *** finite element analysis verifies the bending ability under different temperatures,while the adhesion model analyzes the influence of preload on contact area and ***,an Unmanned Aerial Vehicle(UAV)landing device with SMPBA was designed and manufactured to achieve UAV landing on and detaching from various *** study provides a novel switchable bio-inspired adhesive and UAV landing method.

关键词： Bio-inspired adhesive Shape memory polymers Switchable adhesive Unmanned aerial vehicle Landing

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Effect of Room Temperature Ultrasonic Vibration Compression on the Microstructure Evolution and Mechanical Properties of AZ91 Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1135-1146页

作者： Ziyue Xu Huan Liu Luyao Li Chao Sun Xi Tan Baishan Chen Qiangsheng Dong Yuna Wu Jinghua Jiang Jiang Ma College of Materials Science and Engineering Hohai UniversityNanjing210000China Suzhou Research Institute of Hohai University Suzhou215000China Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China Institute of Medical Devices(Suzhou) Southeast UniversitySuzhou215163China Institute for Advanced Study Central South UniversityChangsha410083China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing211167China

To investigate the potential of direct ultrasonic vibration on improving the performance of magnesium alloys,this study first employed the ultrasonic vibration compression(UVC)on the solid solution treated AZ91 alloy,and explored its microstructure evolution and mechanical properties under *** only two seconds,the UVC alloys showed large deformation strains of 34.8–54.4%,and sudden increase of sample temperature to 243℃.Microstructure characterizations proved that UVC promoted the formation of abundant shear bands,fine grains,and the bimodal distribution of Mg17Al12 precipitates consisting of submicron particles located within the shear bands and nano-sized ones within the *** to the unique microstructure,the micro-hardness(and nano-hardness)value of UVC alloy was increased by 37.7%(35%)when compared with the solution-treated ***,the nano-modulus of the developed AZ91 alloy was also significantly increased to 62 GPa by statistical nanoindentation tests,which could be ascribed to increased Mg_(17)Al_(12) precipitates and decreased c/a value to some *** general,this work provides a new insight into the design and preparation of high-performance magnesium alloys by UVC at room temperature.

关键词： AZ91 alloys Ultrasonic vibration compression Precipitation Shear bands Mechanical properties

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Rotational manipulation of massive particles in a 2D acoustofluidic chamber constituted by multiple nonlinear vibration sources

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Chinese Physics B 2022年第4期31卷 361-372页

作者： Qiang Tang Pengzhan Liu Shuai Tang Jiangsu Provincal Engineering Research Center for Biomedical Materials and Advanced Medical Devices Faculty of Mechanical and Material EngineeringHuaiyin Institute of TechnologyHuaian 223003China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Advanced Manufacturing Technology Faculty of Mechanical and Material EngineeringHuaiyin Institute of TechnologyHuaian 223003China

Rotational manipulation of massive particles and biolo gical samples is essential for the development of miniaturized lab-on-a-chip platforms in the fields of chemical,medical,and biological *** this paper,a device concept of a two-dimensional acoustofluidic chamber actuated by multiple nonlinear vibration sources is *** functional chamber enables the generation of acoustic streaming vortices for potential applications that include strong mixing of multiphase flows and rotational manipulation of micro-/nano-scale objects without any rotating *** numerical simulations,we find that diversified acoustofluidic fields can be generated in the chamber under various actuations,and massive polystyrene beads inside can experience different acoustophoretic motions under the combined effect of an acoustic radiation force and acoustic ***,we investigate and clarify the effects of structural design on modulation of the acoustofluidic fields in the *** believe the presented study could not only provide a promising potential tool for rotational acoustofluidic manipulation,but could also bring this community some useful design insights into the achievement of desired acoustofluidic fields for assorted microfluidic applications.

关键词： acoustic streaming acoustofluidics ultrasonic vibration rotational manipulation

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Synergistic effect of Pd single atoms and clusters on the de/re-hydrogenation performance of MgH_(2)

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Journal of Materials Science & technology 2024年第24期191卷 49-62页

作者： Nuo Xu Haoran Zhou Mingqiang Zhang Yuchuan Ye Kaiwen Wang Yingtang Zhou Yunfeng Zhu Yao Zhang School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine AquacultureMarine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316004China ICFO-Institut de Ciències Fotòniques The Barcelona Institute of Science and TechnologyCastelldefels(Barcelona)08860Spain Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China College of Materials Science and Engineering Jiangsu Collaborative Innovation Centre for Advanced InorganicFunction CompositesNanjing Tech UniversityNanjing 211816China

Hydrogen storage plays a pivotal role in the hydrogen industry,yet its current status presents a *** strategies have emerged in recent years to address this ***_(2) has stood out as a promising solid-state hydrogen storage material due to its impressive gravimetric and volumetric hydrogen density,but its practical application is hampered by elevated thermal stability and sluggish *** this study,we introduce a solution by synthesizing Pd metallene through a one-pot solvothermal method,revealing a distinctive highly curved lamellar structure with a thickness of around 1.6 *** this Pd metallene into MgH_(2) results in a composite system wherein the starting dehydrogenation temperature is significantly lowered to 439 K and complete dehydrogenation occurs at 583 K,releasing 6.14 wt.%*** activation energy of dehydrogenation for MgH_(2) was reduced from 170.4 kJ mol^(-1) to 79.85 kJ mol^(-1) after Pd metallene *** enthalpy of dehydrogenation of the MgH_(2)-10 wt.%Pd sample was calculated to be 73 kJ mol^(-1) H_(2)^(-1) and decreased by 4.4 kJ mol^(-1) H_(2)^(-1) from that of dehydrogenation of pure MgH_(2)(77.4 kJ mol^(-1) H_(2)-1).Theoretical calculations show that the average formation energy and average adsorption energy of hydrogen vacancies can be significantly reduced in the presence of both Pd clusters and Pd single atoms on the surface of MgH_(2)/Mg,*** suggests that the synergistic effect of in situ formed Pd single atoms and clusters significantly improves the hydrogenation and dehydrogenation *** identified active sites in this study hold potential as references for forthcoming multi-sized active site catalysts,underscoring a significant advancement toward resolving hydrogen storage limitations.

关键词： MgH_(2) Metallene Single atoms Clusters Hydrogen storage

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A thermoviscoelastic finite deformation constitutive model based on dual relaxation mechanisms for amorphous shape memory polymers

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International Journal of Smart and Nano Materials 2023年第2期14卷 243-264页

作者： Hao Duan Jianping Gu Hao Zeng Akbar A.Khatibi Huiyu Sun State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjingChina Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology School of Materials Science and EngineeringNanjing Institute of TechnologyNanjingChina School of Physical and Mathematical Sciences Nanjing Tech UniversityNanjingChina School of Engineering Royal Melbourne Institute of TechnologyMelbourneAustralia

This paper proposes a new thermoviscoelastic finite deformation model incorporating dual relaxation mechanisms to predict the complete thermo-mechanical response of amorphous shape memory *** model is underpinned by the detailed microscopic molecular mechanism and effectively reflects the current understanding of the glass transition *** evolution rules are obtained from the model to characterize the viscous flow,and a new theory named an internal stress model is introduced and combined with the dual relaxation mechanisms to capture the stress *** rationality of the constitutive model is verified as the theoretical results agree well with the experimental ***,the constitutive model is further simplified to facilitate engineering applications,and it can roughly capture the characteristics of shape memory polymers.

关键词： Shape memory polymers constitutive model dual relaxation mechanisms viscous flow rules internal stress model

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Efficient electrooxidation of biomass-derived aldehydes over ultrathin Ni V-layered double hydroxides films

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Journal of Energy Chemistry 2023年第3期78卷 412-421,I0012页

作者： Biying Liu Zhikeng Zheng Yaoyu Liu Man Zhang Yuchen Wang Yangyang Wan Kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275GuangdongChina Guangdong Laboratory for Lingnan Modern Agriculture South China Agricultural UniversityGuangzhou 510642GuangdongChina Institute for Advanced Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang 212013JiangsuChina

Selective upgrading of C=O bonds to afford carboxylic acid is significant for the petrochemical industry and biomass *** we declared the efficient electrooxidation of biomass-derived aldehydes family over NiV-layered double hydroxides(LDHs) thin *** studies confirmed the hydroxyl active intermediate(-OH*) generated on the surface of NiV-LDHs films by employing electrochemical impedance spectroscopy and the electron paramagnetic resonance *** using advanced techniques,e.g.,extended X-ray absorption fine structure and high-angle annular dark-field scanning transmission electron microscopy,NiV-LDHs films with 2.6 nm could expose larger specific surface *** benzaldehyde as a model,high current density of 200 mA cm^(-2)at 1.8 V ***,81.1% conversion,77.6% yield of benzoic acid and 90.8% Faradaic efficiency were reached,which was superior to most of previous *** DFT analysis was well matched with experimental findings and documented that NiV-LDHs had high adsorption capacity for the aldehydes to suppress the side reaction,and the aldehydes were oxidized by the electrophilic hydroxyl radicals formed on *** findings offer a universal strategy for the robust upgrading of diverse biomass-derived platform chemicals.

关键词： NiV-LDHs Films Hydroxyl radicals Electrocatalytic oxidation Biomass-derived aldehydes

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Energy Management Strategy for Plug-in Hybrid Electric Vehicles Based on Improved Annealing Algorithm 8

Energy Management Strategy for Plug-in Hybrid Electric Vehic...

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8th International Conference on Electromechanical control technology and Transportation, ICECTT 2023

作者： Hu, Chao Niu, Limin Zhang, Daiqing Wan, Lingchu School of Mechanical Engineering Anhui University of Technology Ma'anshan243032 China Key Laboratory of Advanced Numerical Control & Servo Technology of Anhui Province Anhui Polytechnic University Wuhu241000 China

ISBN: (纸本)9781510668331

In order to solve the problem that minimum control strategy of equivalent fuel consumption for plug-in hybrid electric vehicles (PHEVs) is not effective, an ECMS energy management strategy based on improved annealing algorithm was designed. Firstly, based on the traditional control model, the optimized PID equivalent factor control model is constructed. In order to solve the problem of overfitting when optimizing the traditional annealing algorithm (SA), tempering link and memory search function were added to the algorithm, and the improved algorithm was used to optimize the PID equivalent factor, and the vehicle dynamics simulation was carried out in MATLAB/SIMULINK environment. The results show that: Under the Worldwide Light-duty Test Cycle (WLTC) conditions, compared with the rule-based logical threshold control strategy and the pre-optimized ECMS strategy, the optimized ECMS strategy increased the fuel saving rate by 18.49% and 3.28%, respectively. Under the New European Driving Cycle (NEDC) conditions, compared with the rule-based logical threshold control strategy and the pre-optimized ECMS strategy, the fuel saving rate is increased by 20.20% and 2.61%, respectively. The proposed model effectively reduces fuel consumption and has good robustness. © 2023 SPIE.

关键词： Simulated annealing

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Effects of local matrix environment on the spectroscopic properties of ensemble to single-particle level carbon dots

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Chinese Chemical Letters 2022年第2期33卷 751-756页

作者： Zhihong Wei Boyang Wang Mingcai Xie Daocheng Hong Xin Yang Sushu Wan Weiqing Yang Siyu Lu Yuxi Tian Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringJiangsu Key Laboratory of Vehicle Emissions ControlNanjing UniversityNanjing 210023China Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China

Carbon dots(CDs), because of their unique properties, are being rapidly developed as important luminescent materials for imaging, sensing, and use in photonic devices. However, most of the reported fundamental properties of the CDs are results of investigations conducted in the solution state, which may be completely different from those conducted in the solid state. In this work, we study the luminescence properties, photostability, and the dynamics of CDs in different matrix environments, from ensemble to the single-particle level. We observed that the properties associated with the emission centers and photostability of CDs were extremely sensitive to the local chemical environment. A better understanding of the dependence of the spectroscopic properties of CDs on the complex local chemical environment is an important step toward finding new ways of controlling the optical properties of CDs and optimizing their use in various applications.

关键词： Carbon dots Matrix effects Single-particle Photostability Blinking

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Higher-order polysulfides induced thermal runaway for 1.0 Ah lithium sulfur pouch cells

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Particuology 2023年第8期79卷 10-17页

作者： Feng-Ni Jiang Shi-Jie Yang Zi-Xian Chen He Liu Hong Yuan Lei Liu Jia-Qi Huang Xin-Bing Cheng Qiang Zhang College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan030024ShanxiChina Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing211189JiangsuChina School of Chemistry and Materials Science Nanjing University of Information Science and TechnologyNanjing210044JiangsuChina

Comprehensive analyses on thermal runaway mechanisms are critically vital to achieve the safe lithium-sulfur(Li-S)*** reactions between dissolved higher-order polysulfides and Li metal were found to be the origins for the thermal runaway of 1.0 Ah cycled Li-S pouch cells.16-cycle pouch cell indicates high safety,heating from 30 to 300 ℃ without thermal runaway,while 16-cycle pouch cell with additional electrolyte undergoes severe thermal runaway at 147.9 ℃,demonstrating the key roles of the electrolyte on the thermal safety of *** the contrary,thermal runaway does not occur for 45-cycle pouch cell despite the addition of the *** is found that the higher-order polysulfides(Li_(2)S_(x) ≥ 6)are discovered in 16-cycle electrolyte while the sulfur species in 45-cycle electrolyte are Li_(2)S_(x) ≤ *** addition,strong exothermic reactions are discovered between cycled Li and dissolved higher-order polysulfide(Li_(2)S_(6) and Li_(2)S_(8))at 153.0 ℃,driving the thermal runaway of cycled Li-S pouch *** work uncovers the potential safety risks of Li-S batteries and negative roles of the polysulfide shuttle for Li-S batteries from the safety view.

关键词： Lithium-sulfur batteries Thermal runaway Polysulfides Pouch cell Polysulfide shuttle

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Optimized design and performance testing of hydraulic electrostatic actuator

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International Journal of Smart and Nano Materials 2024年第4期15卷 811-834页

作者： Yuze Ye Qingsong He Changli Yang Xiaodong Xu Lin Xie Diyi Liu Bo Zeng Zhijian Leng Jiangsu Key Laboratory of Bionic Materials and Equipment College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina Key Laboratory of Advanced Technology for Small and Medium-Sized UAV Ministry of Industry and Information TechnologyUnmanned Aerial Vehicles Research InstituteNanjing University of Aeronautics and AstronauticsNanjingChina State Key Laboratory of Mechanics and Control of Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjingChina Laboratory of Aerospace Servo Actuation and Transmission Beijing Institute of Precision Mechatronics and ControlsBeijingChina Technology Center CCCC Second Harbor Engineering CompanyWuhanChina

Hydraulic electrostatic actuators have become a research hotspot for their inherent flexibility and safety of human-machine *** paper aims to combine the characteristics of dielectric elastomers and fluid actuators,enhancing the dielectric constant and breakdown field strength by modifying Al_(2)O_(3)on the surface of nanostructured BaTiO3 and in order to develop a hydraulic electrostatic actuator with silicone rubber as the matrix ***-factor experiments were firstly conducted to confirm the range of three factors affecting the actuation strain of the actuator:BaTiO_(3)@Al_(2)O_(3)content,thickness of the silicone rubber elastomer film,and pre-stretching ratio *** response surface methodology was used to study the interactive influence of the above three influencing factors on the actuation *** was obtained that A has an insignificant influence on the actuation strain,AB has a significant influence on the actuation strain,and B,C,AC,and BC have a highly influence on the actuation *** actuation strain as the optimization objective yielded the combination results of each factor:BaTiO_(3)@Al_(2)O_(3)content of 2.57%,thickness of 0.60 mm,and pre-stretching ratio coefficient of *** strain tests were conducted with optimized parameters under *** experimental results of the actuation strain test show that the relative error between the test value and the model prediction value of 16.47%is less than 5%,and the optimization model results are *** optimized hydraulic electrostatic actuator was tested for actuation strain and electrical performance under different *** experiment showed that the maximum actuation strain of the hydraulic electrostatic actuator was 17.20%under a load of 100 *** critical breakdown current of the actuator ranged from 115μA to 130μA,and the maximum electromechanical conversion efficiency of the actuator under different loads was 67.93%.Finally,a joint actuati

关键词： Hydraulic electrostatic actuator BaTiO_(3)@Al_(2)O_(3) response surface experiments actuation strain

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