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Highly Aligned Graphene Aerogels for multifunctional composites

Nano-Micro Letters 2024年第6期16卷 276-342页

作者： Ying Wu Chao An Yaru Guo Yangyang Zong Naisheng Jiang Qingbin Zheng Zhong‑Zhen Yu Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083People’s Republic of China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004People’s Republic of China School of Science and Engineering The Chinese University of Hong KongShenzhenShenzhenGuangdong 518172People’s Republic of China State Key Laboratory of Organic‑Inorganic composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Stemming from the unique in-plane honeycomb lattice structure and the sp^(2)hybridized carbon atoms bonded by exceptionally strong carbon–carbon bonds,graphene exhibits remarkable anisotropic electrical,mechanical,and thermal *** maximize the utilization of graphene’s in-plane properties,pre-constructed and aligned structures,such as oriented aerogels,films,and fibers,have been *** unique combination of aligned structure,high surface area,excellent electrical conductivity,mechanical stability,thermal conductivity,and porous nature of highly aligned graphene aerogels allows for tailored and enhanced performance in specific directions,enabling advancements in diverse *** review provides a comprehensive overview of recent advances in highly aligned graphene aerogels and their *** highlights the fabrication methods of aligned graphene aerogels and the optimization of alignment which can be estimated both qualitatively and *** oriented scaffolds endow graphene aerogels and their composites with anisotropic properties,showing enhanced electrical,mechanical,and thermal properties along the alignment at the sacrifice of the perpendicular *** review showcases remarkable properties and applications of aligned graphene aerogels and their composites,such as their suitability for electronics,environmental applications,thermal management,and energy *** and potential opportunities are proposed to offer new insights into prospects of this material.

关键词： Highly aligned graphene aerogels Quantitative characterization of alignment multifunctional composites Anisotropic properties multifunctional applications

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Large-scale preparation of high-performance boron nitride/aramid nanofiber dielectric composites

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Nano Research 2022年第9期15卷 8648-8655页

作者： Liying Su Xiaoyan Ma Jiale Zhou Xiangchen Liu Fanglin Du Chao Teng College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042China Weihai Jin Hong Group Co. Ltd.Weihai 264211China

Dielectric polymers featuring high thermal conductivity,excellent mechanical,and stable dielectric properties over a broad temperature range have attracted extensive scientific *** this work,a large-scale,layered film was fabricated using blade-coating approach,which integrated aramid nanofibers(ANFs)and boron nitride nanosheets(BNNSs)through a typical solgel transformation *** as-prepared film with 20 wt.%BNNS displays high thermal conductivity(14.03 W·m^(−1)·K^(−1)),103-fold higher than pure ANF film,attributing to massive continuous thermal conduction pathway between BNNSs so as to facilitate fast phonon *** film boasts excellent mechanical properties(stress 97.14±5.17 MPa,strain 19.36±0.35%),high degradation temperature(~542℃),a moderate dielectric constant(~6.9 at 104 Hz),together with low dielectric loss(~0.026 at 104 Hz).Meanwhile,the film reveals high breakdown voltage(310 MV·m^(−1))and volume resistivity(1013Ω·cm).Notably,these dielectric properties remain largely unchanged over a wide temperature range(25 to 200℃).

关键词： multifunctional composites thermal properties mechanical properties dielectric properties

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Interlayer engineering in 3D graphene skeleton realizing tunable electronic properties at a highly controllable level for piezoresistive sensors

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Nano Research 2023年第7期16卷 8512-8521页

作者： Xunxiang Hu Lingling Tan Xianzhang Wu Jinqing Wang College of Material Science and Engineering Hunan Province Key Laboratory of Materials Surface&Interface Science and TechnologyCentral South University of Forestry and TechnologyChangsha 410004China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Three-dimensional(3D)graphene is a promising active component for various engineering fields,but its performance is limited by the hidebound electrical conductivity levels and hindered electrical *** we present a novel approach based on interlayer engineering,in which graphene oxide(GO)nanosheets are covalently functionalized with varied molecular lengths of diamine *** has led to the creation of an unprecedented class of 3D graphene with highly adjustable electronic *** calculations and experimental results demonstrate that ethylenediamine,with its small diameter acting as a molecular bridge for facilitating electron transport,has the potential to significantly improve the electrical conductivity of 3D *** contrast,butylene diamine,with its larger diameter,has a reverse effect due to the enlarged spacing of the graphene interlayers,resulting in conductive *** importantly,the moderate conductive level of 3D graphene can be achieved by combining the interlayer spacing expansion effect and theπ-electronic donor ability of aromatic *** resulting 3D graphene exhibits highly tunable electronic properties,which can be easily adjusted in a wide range of 2.56-6.61 S·cm^(-1)compared to pristine GO foam(4.20 S·cm^(-1)).This opens up new possibilities for its use as an active material in a piezoresistive sensor,as it offers remarkable monitoring abilities.

关键词： graphene tunable electronic properties multifunctional composites piezoresistive sensor

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Shape Memory Polymer Fibers:Materials,Structures,and Applications

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Advanced Fiber Materials 2022年第1期4卷 5-23页

作者： Lu Wang Fenghua Zhang Yanju Liu Jinsong Leng Centre for Composite Materials and Structures Harbin Institute of Technology(HIT)No.2 Yikuang StreetHarbin 150080People’s Republic of China Department of Astronautic Science and Mechanics Harbin Institute of Technology(HIT)No.92 West Dazhi StreetHarbin 150001People’s Republic of China

Shape memory polymer(SMP)is a kind of material that can sense and respond to the changes of the external environment,and its behavior is similar to the intelligent refection of ***,as a versatile and feasible technique,has been used to prepare shape memory polymer fbers(SMPFs)and expand their *** show some advanced features and functions in many *** this review,we give a comprehensive overview of SMPFs,including materials,fabrication methods,structures,multifunction,and ***,the mechanism and characteristics of SMP are *** then discuss the electrospinning method to form various microstructures,like non-woven fbers,core/shell fbers,hollow fbers and oriented ***,the multiple functions of SMPFs are discussed,such as multi-shape memory efect,reversible shape memory efect and remote actuation of *** also focus on some typical applications of SMPFs,including biomedical scafolds,drug carriers,self-healing,smart textiles and sensors,as well as energy harvesting *** the end,the challenges and future development directions of SMPFs are proposed.

关键词： Shape memory polymer Micro/nano fbers Electrospinning Microstructures multifunctional composites Applications

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