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Dried bonito flakes-inspired moisture-responsive actuator with a gradient structure for smart devices

Journal of Materials science & technology 2023年第36期167卷 152-160页

作者： Zhong Chen Qingyu Peng Ying Hu Zonglin Liu Xu Zhao Pengyang Li Liangliang Xu Haowen Zheng Fuhua Xue Renjie Ding Xiaodong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China Institute of Industry&Equipment Technology Hefei University of TechnologyHefei 230009China

Exploring high-performance soft actuators from biomass resources is significant for developing eco-friendly smart *** bonito(DB)flake is a common food as well as a biomass material,and it can produce irregular motion in changed moisture,just like *** by this intriguing phenomenon,a cost-effective,biocom patible,and biodegradable moisture-responsive DB film actuator with a gradient structure is *** DB film actuator exhibits rapid and reversible bending deformation triggered by a humidity gradient with a high bending speed(40°s-1)and a maximum bending angle(180°).More-over,the DB film actuator shows large bending deformation(-71°to+51°)with a high actuation force(214.7 Pa)in response to changes in relative ***,the actuation performance can be also tuned by adjusting the thickness of the *** applications of this actuator,including smart grippers,crawling robots,and biomimetic flowers for visible humidity sensing,are *** importantly,smart sweat-responsive wearables that automatically deform to promote sweat evaporation and convection during exercise are constructed based on the actuator,making it promising for adaptive personal thermal *** work offers an easily processable,cost-effective,and environmentally benign strategy to construct moisture-responsive actuators for future eco-friendly smart devices.

关键词： Moisture-responsive Dried bonito flakes Actuators Smart wearables Soft robots

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Mn-N-P doped carbon spheres as an efficient oxygen reduction catalyst for high performance Zn-Air batteries

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Chinese Chemical Letters 2023年第1期34卷 177-181页

作者： Jiajie Li Shanbao Zou Jinzhen Huang Xiaoqian Wu Yue Lu Xundao Liu Bo Song Dehua Dong School of Materials Science and Engineering University of JinanJi nan 250022China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

Low-cost and efficient oxygen reduction reaction(ORR)electrocatalysts are the key to developing Zn-air batteries for renewable energy ***,the Mn-N-P doped carbon sphere was prepared through polymerization of hexachlorotripolyphosphazene(HCCP)and phloroglucinol,and then followed the calcination at 900°*** calculations demonstrated the introduction of Mn in N-P doped carbon could lower the dissociation barrier of O2into O*and promote the ORR through a *** asprepared catalysts exhibited a half-wave potential of 0.82 V *** and limiting current density of 5.2 m A/cm^(2)toward ORR,which was comparable to those of the commercial Pt/C *** addition,Zn-air batteries with 0.05 Mn-N-P-C catalysts showed a high specific capacity of 830 m Ah/gZnand excellent cycle *** facile approach demonstrated herein could be a solution to develop optimum non-precious metal catalysts for the application in cathodes of proton exchange membrane fuel *** study also provides new insight to design the catalysts of multi-heteroatom coordinated metal in the carbon matrix for both fundamental researches and practical applications.

关键词： Oxygen reduction reaction Zn-air batteries Transition metal Doped carbon spheres

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Design,fabrication,and dynamic mechanical responses of fiber-reinforced composite lattice materials

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International Journal of Mechanical System Dynamics 2023年第3期3卷 213-228页

作者： Jian Xiong Cheng Gong Qianqian Wu Li Ma Jinshui Yang Linzhi Wu Center for Composite Materials and Structures Harbin Institute of TechnologyHarbinChina National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina

Fiber-reinforced composites are a popular lightweight materials used in a variety of engineering applications,such as aerospace,architecture,automotive,and marine construction,due to their attractive mechanical *** lattice materials from fiber-reinforced composites is an efficient approach for developing ultra-lightweight structural systems with superior mechanical proper-ties and multifunctional *** contrast to corrugated,foam,and honeycomb core materials,composite lattice materials can be manufactured with various architectural designs,such as woven,grid,and truss ***,lattice materials with open-cell topology provide multifunctional advantages over conventional closed-cell honeycomb and foam structures and are thus highly desirable for developing aerospace systems,hypersonic vehicles,long-range rockets and missiles,ship and naval structures,and protective *** objective of this study is to review and analyze dynamic mechanical behavior performed by different researchers in the area of composite lattice materials and to highlight topics for future research.

关键词： fiber-reinforced composite lattice structures sandwich structures dynamic mechanical behavior

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Frequency reconfigurable antenna actuated by inflated triangular structure:Design and analysis

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Chinese Journal of Aeronautics 2023年第5期36卷 280-285页

作者： Jiaming GUO Xinghan QIU Jiawei ZHANG Lamei ZHANG Changguo WANG School of Astronautics Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin 150001China School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China

This paper proposes a frequency reconfigurable triangular antenna actuated by an inflated triangular *** open path antenna is transformed from an open type to a closed structure by *** structures are easy to manufacture by fusing 2 inextensible membranes together along a defined pattern of ***,the prediction of their deployed shape remains a *** solve the pattern changed problem,guided by geometric analyses and local buckle characteristics,the inflated triangular structure has been designed and verified by experiment and *** the process of transformation of the antenna,the resonant frequency of the antenna is changed because this frequency is determined by the conformational *** resonant frequency changes from GHz to kHz when the design of initial structure sizes is from millimeter to *** measured peak gains,the frequency,and the radiation direction are also reconfigurable by the initial ***,the reconfigurable resonator array is presented,which is coupled to electric fields to absorb all incident *** this work,the changed pattern design by inflating is applied to the antenna design,and its frequency reconfigurability is *** the electricity performance analysis of the reconfigurable antenna,precise manufacturing will be possible and provide guidance for manufacturing frequency reconfigurable antennas.

关键词： Free kink design Frequency Reconfigurable Antenna(FRA) Inflated Return losses Thin film

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INVESTIGATION OF PYROLYSIS CHARACTERISTICS OF SILICONE-PHENOLIC MATRIX NANOcomposites THROUGH KINETIC ANALYSIS AND REAXFF MD SIMULATIONS 23

INVESTIGATION OF PYROLYSIS CHARACTERISTICS OF SILICONE-PHENO...

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23rd International Conference on Composite Materials, ICCM 2023

作者： Xiao, Jie Fang, Guodong Wang, Bing Hong, Changqing Meng, Songhe National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin China

The pyrolysis characteristics of the polymeric nanocomposites are dominantly governed by the pyrolyzable components to accommodate a specific thermodynamic environment. The pyrolysis behaviour of the pyrolyzable system including silicone and phenolic aerogels (SiOC/PR) of silicone-modified phenolic aerogel matrix nanocomposites was investigated by TG and TG-FTIR, which shows that a mass ratio of PR to SiOC of 3:1 exhibits better thermal stability. The distributed activation energy model (DAEM) was employed to investigate the decomposition kinetics, and the results show that the five-pseudo-components DAEM effectively represents the decomposition conversion signature of SiOC/PR. Methanol, the major volatile product affecting the thermal decomposition of the SiOC/PR system, was analysed at an atomic scale by ReaxFF molecular dynamics (MD) simulations for its reaction pathways. The MD results show that there are two main pathways for the production of methanol, which are extraction reactions of methyl intermediates and hydroxymethyl intermediates, respectively. The Si-O-Si backbone of SiOC can bridge the PR fragments at elevated temperatures, which impacts the yield of condensed residues. Based on TG experimental data, the dependence of weight loss on temperature for SiOC/PR systems with different mixture ratios was predicted by artificial neural networks (ANN). The ANN with a 20*3*1 topology exhibits promising prediction performance. Our work aims to provide practical guidance for engineers to optimize process procedures with a better knowledge of the features of chemical systems. © 2023 International Committee on Composite Materials. All rights reserved.

关键词： Aerogels

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High Temperature Mechanical Properties of Carbon/Phenolic Composite at High Heating Rate 23

High Temperature Mechanical Properties of Carbon/Phenolic Co...

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23rd International Conference on Composite Materials, ICCM 2023

作者： Lin, X. Xie, W. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin China

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Mechanical and shape-memory properties of TPMS with hybrid configurations and materials

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International Journal of Smart and Nano Materials 2024年第4期15卷 786-810页

作者： Tianzhen Liu Wei Zhao Yongtao Yao Cheng Lin Hanxing Zhao Jianguo Cai Key Laboratory of C&PC Structures of Ministry of Education National Prestress Engineering Research CenterSoutheast UniversityNanjingChina Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbinChina National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina

Triply periodic minimal surface(TPMS)structures with excellent properties of stable energy absorption,light weight,and high specific strength could potentially spark immense interest for novel and programmable functions by combining smart materials,*** memory polymers(SMPs).This work proposes TPMS lattices with hybrid configurations and materials that are composed of viscoelastic and shape-memory materials with the aim to bring temperature-dependent mechanical properties and additional dissipation *** configurations and diverse materials of polylactic acid(PLA),fiber-reinforced PLA,and polydimethylsiloxane(PDMS)are induced,generating five types of TPMS lattices,including(Schoen’s I-WP)IWP uniform lattice,IWP lattice with density gradient,hybrid configurations,hybrid materials,and filled PDMS,which are fabricated by 3D *** fracture morphologies and the distribution of carbon fibers are demonstrated via scanning electron microscopy with a focus on the influence of carbon fiber on shape-memory and mechanical *** recovery tests are conducted,which proves good shape memory properties and reusable capability of TPMS *** combined methods of experiments and numerical simulation are adopted to evaluate mechanical properties,which presents multi-stage energy absorption ability and tunable vibration isolation performances associated with temperature and hybridization *** work can promote extensive research and provide substantial opportunities for TPMS lattices in the development of functional applications.

关键词： Triply periodic minimal surface shape memory property hybridization multi-stage energy absorption

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A Novel Hierarchically Lightweight Porous Carbon Derived from Egg White for Strong Microwave Absorption

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Engineering 2022年第11期18卷 161-172页

作者： Zonglin Liu Xu Zhao Liangliang Xu Qingyu Peng Xiaodong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructureHarbin Institute of TechnologyHarbin 150080China

Egg custard is a common dish on the dining table and exhibits a uniform porous structure after *** protein within egg custard is a rich source of carbon and nitrogen,and the custard’s unique microstructure and adjustable electrical properties make it a potential porous carbon ***,nitrogen in situ doped porous carbons(NPCs)and potassium-carbonate-modified NPCs(PNPCs)are obtained through a simple gelation and carbonization process using egg white as the raw *** unique morphologies of the porous carbon are inherited from the protein and include fibrous clusters,honeycomb holes,and a grooved *** excellent impedance matching and effective internal loss make the obtained porous carbons good candidates for lightweight electromagnetic(EM)wave absorbers without the need to dope with metal *** a representative porous carbon,PNPC10-700 has multiple structures,including fibrous clusters,honeycomb holes,and a porous ***,it achieves a maximum reflection loss value of-66.15 dB(with a thickness of 3.77 mm)and a broad effective absorption bandwidth of 5.82 GHz(from 12.18 to 18.00 GHz,with a thickness of 2.5mm),which surpasses the reported values in most of the literatu ***,gelation combined with the further carbonization of egg white(protein)is a new method for designing the morphology and EM properties of porous carbon absorbers.

关键词： Microwave absorption Porous carbon Biomass K2CO3

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Recent advances in MXene for terahertz applications

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Optoelectronics Letters 2024年第5期20卷 272-288页

作者： ZHANG Yongzhi JIANG Jiuxing YAO Yongtao HE Xunjun Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China College of Science Harbin University of Science and TechnologyHarbin 150080China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin University of Science and TechnologyHarbin 150080China

Since first synthesized in 2011, MXenes have attracted extensive attention in many scientific fields as a new two-dimensional(2D) material because of the unique physical and chemical properties. Over the past decade, in particular, MXenes have obtained numerous exciting achievements in the field of terahertz applications. In this review, we first briefly introduce the MXene materials, such as the basic structure and main fabrication processes of MXenes. Then, we summarize the recent applications of MXene materials in various terahertz research areas, including terahertz modulation, terahertz absorption, terahertz shielding, terahertz communication, terahertz detection and terahertz generation, in which the representative results are presented. Finally, we give an outlook on the future research directions of MXene materials and their potential applications.

关键词： terahertz directions absorption

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A tree-growing graphic model for asymmetrical phantom networks in polymeric gels undergoing dynamic mechanochemical coupling

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science China(Technological sciences) 2024年第2期67卷 558-567页

作者： SHI WeiLin ZHOU Jian LU HaiBao ELMARAKBI Ahmed FU Yong-Qing National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Faculty of Engineering and Environment University of NorthumbriaNewcastle upon Tyne NEI 8STUK

Network structures of various polymers have significant effects on their mechanical properties;therefore,numerous studies have investigated the constitutive relationship between symmetrical network structures and their rubber elasticity in ***,few studies have focused on asymmetrical network structures in polymers that undergo bond exchange reactions,selfassembly,or mechanochemical coupling—all of which are induced by transition probabilities of chemical bonding *** this study,an extended constraint junction and phantom network model is formulated using the tree-growing theory to establish a constitutive relationship between asymmetrical network structures and their rubber elasticity in polymers.A free-energy equation is further developed to explore working principles of configurational transitions on the dynamic rubber elasticity of symmetrical and asymmetrical network *** constitutive relationship between dynamic rubber elasticity and symmetrical and asymmetrical network structures has also been proposed for the gels undergoing mechanochemical and hydromechanical ***,the effectiveness of this newly proposed tree-growing model has been verified by comparing with the classical affine network model,finite element analysis,and the experimental results of gels reported in literature.

关键词： gel polymer network rubber elasticity asymmetric

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