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Construction of dual crosslinked network binder via sequential ionic crosslinking for high-performance silicon anodes

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Rare Metals 2023年第7期42卷 2238-2249页

作者： Ji-Na Wu Hong-Xu Chen Chao Chen Hai-Dong Li Hong-Wen Zhang Bo Wang School of Materials Science and Engineering Changzhou UniversityChangzhou213164China Nanotechnology Research Institute Jiaxing UniversityJiaxing314001China Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province Jiaxing UniversityJiaxing314001China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin150080China

Nowadays,silicon has become a promising anode active material for lithium-ion batteries due to its high specific ***,traditional binder materials cannot effectively restrain the volume expansion of silicon during lithiation/*** by the growth process of climbing plants,we sequentially crosslink sodium alginate with calcium ions and hyperbranched polyethyleneimine to construct a dual crosslinked network *** the sequentially crosslinking,sodium alginate preferentially crosslinks with Ca^(2+)to form the"trellis"network,which restricts the free movement of hyperbranched polyethyleneimine and guides it,like"vine",to gradually anchor on the surrounding"trellis"through hydrogen and ionic *** this dual crosslinked network,the ionic ally crosslinked sodium alginate maintains the anode structural integrity;the anchored hyperbranched polyethyleneimine forms strong multidimensional hydrogen bonds with silicon nanoparticles through its amino-rich branch chains;and the network utilizes the bonding reversibility of hydrogen and ionic bonds to repeatedly eliminate the mechanical stress and self-heal the structure damages caused by the volume change of *** from the multifunction of the dual crosslinked network,the silicon anode has achieved an excellent electrochemical performance with a specific capacity of 2403 mAh·g^(-1)at the current density of500 mA·g^(-1)after 100 cycles.

关键词： Sodium alginate Hyperbranched polyethyleneimine(HBPEI) Ionic crosslinking Binder Silicon anode Lithium-ion battery(LIB)

Specific Ion Effects on the Enzymatic Degradation of Polyester Films

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Chinese Journal of Polymer Science 2023年第4期41卷 476-482,I0005页

作者： Jian Zhang Jie Zhu Zan Hua Guang-Ming Liu Department of Chemical Physics Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesUniversity of Science and Technology of ChinaHefei230026China Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province College of Material and Textile EngineeringJiaxing UniversityJiaxing314001China Biomass Molecular Engineering Center and Department of Materials Science and Engineering School of Forestry and Landscape ArchitectureAnhui Agricultural UniversityHefei230036China

Soil environment on earth contains a variety of ions,which are expected to play a vital role in the biodegradation of plastics discarded in the *** this work,poly(butyleneadipate-co-terephthalate)(PBAT)is employed as a model biodegradable plastic to study the specific ion effects on the enzymatic degradation of polyester *** results show that the specific ion effects on the enzymatic degradation rate of the PBAT films and on the catalytic rate constant for the enzymatic hydrolysis of the ester bonds are strongly dependent on temperature and ionic *** the enzymatic degradation rate and catalytic rate constant decrease following the trends Na^(+)>K^(+)>Ca^(2+)and Cl^(-)>SO_(4)^(2-)>NO_(3)^(-)for cations and anions,respectively,indicating that the ion-specific enzymatic degradation of the PBAT films is closely correlated with the specific ion effects on enzymatic hydrolysis of the ester *** study shows that the specific ion effects on the enzyme activity can be understood by taking into account the ion-specific cation-anion interaction,ionic dispersion force,salting-out effect and salting-in *** study of specific ion effects on the enzymatic hydrolysis of the ester bonds and the resultant enzymatic degradation of the PBAT films would offer us a new clue to develop new biodegradable,environmentally friendly synthetic plastics.

关键词： Specific ion effects Biodegradable films Ion-enzyme interactions Enzyme activity

High Pressure Elastic and Sensitivity Pv/Rgo/Vf composite Flexible Sponge for Intelligent Environmentally Friendly and Physiological Monitoring

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SSRN 2024年

作者： Mao, Yinfeng Hong, Dingsheng Zhou, Xinzheng Chang, Taotao Shen, Lingna Wei, Kaitai Cui, Yifan Li, Ping Zhang, Huanxia Jiaxing Nanhu University Jiaxing314001 China Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province Jiaxing University Jiaxing314001 China Textile College Donghua University Shanghai201600 China

3D graphene-based flexible nanosponges have shown great application potential in areas such as human motion tracking, health monitoring, and electronic skin. However, previously reported graphene-based flexible sensors typically focus on simple pressure sensing, lacking the capability to simultaneously detect both pressure and physiological signals. This limitation restricts their application in the field of intelligent wearable technology. In this study, a pressure-flexible composite sponge sensor was prepared using polyvinylidene fluoride (PVDF), viscose nonwoven fabric, and graphene oxide (GO) in a simple and cost-effective manner. Results showed that high-pressure electrospun PVDF inhibited the α-crystalline phase while promoting the transformation of diffraction peaks into the β-crystalline phase. Furthermore, high-temperature oxidation–reduction improved the crystallinity of β-phase crystals, enhancing the conductivity of PVDF/reduced GO/viscose fiber/polydimethylsiloxane (PV/rGO/VF/P)sponges. With the increase of GO mass ratio, the thermal stability of the flexible composite device improved while weight loss decreased and resistance sensitivity increased. When compressed to 40%, the electrical property is most sensitive, and the composite sponge can fully recover under 60% compression. The addition of viscose fiber with a high swelling effect enables the composite sponge to precisely and sensitively detect the amount of sweat or glucose. This three-dimensional nanosponge can be applied in the design of ergonomic, physiologically monitoring smart wearable devices. © 2024, The Authors. All rights reserved.

关键词： Graphene

Fabrication of 3D ordered needle-like polyaniline@hollow carbon nanofibers composites for flexible supercapacitors

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Chinese Chemical Letters 2021年第8期32卷 2448-2452页

作者： Xuepeng Ni Yang Jiang Haoyu Chen Kunming Li Huifang Chen Qilin Wu Anqi Ju College of Materials Science and Engineering&State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China Zhejiang Provincial Key Laboratory of Yarn Material Forming and Composite Processing Technology Jiaxing UniversityShanghai 201620China Key Laboratory of High-Performance Fibers&Products Ministry of EducationDonghua UniversityJiaxing 314001China

Carbon nanofiber-based supercapacitors have broad prospects in powering wearable electronics owing to their high specific capacity,fast charge/discharge process,along with long-cycling ***,a poly(ac rylo n it rile-co-β-methyl hydrogen itaconate) copolymer was prepared and used to synthesize flexible hollow carbon nanofibers(HCNFs) via an electrospinning method without breaking after multiple ***,the inner and outer surfaces of HCNFs were evenly covered with ordered needlelike polyaniline(PANI) through in-situ polymerization methods to obtain three-dimensional flexible HCNFs/PANI composites,which exhibited a high capacity 1196.7 F/g at 1 A/g and good cycling stability(90.1% retention at 5 A/g after 3000 cycles).The symmetrical supercapacitor based on the HCNFs/PANI composites also delive red an outsta nding electrochemical performance with high energy/power density(60.28 Wh/kg at 1000 W/kg) and superior cycling durability(90% capacitance retention after at 5 A/g3000 cycles),which confirmed that the HCNFs/PANI composites had a wide application potential in flexible energy storage devices.

关键词： Flexible Polyaniline Electrospinning Hollow carbon nanofibers Supercapacitors

Properties of Multistranded Twisted Graphene Fibers and Their Application in Flexible Light-Emitting Devices

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SSRN 2023年

作者： Cheng, Si-Rong Ai, Jiao Li, Ping Li, Wei Zhang, Huanxia Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province Jiaxing University Jiaxing314001 China Textile College Donghua University Shanghai201600 China Jiaxing Nanhu University Jiaxing314001 China College of Textile Science and Engineering International Institute of Silk Zhejiang Sci-Tech University Hangzhou310018 China

As a typical carbon-based material electrode, graphene fiber exhibits many advantages, such as good electrical conductivity, light weight and strong structural designability. Its demand is increasing in the wearable display field. With the help of fine denier fiber spinning combined with multistranded graphene fibers prepared via twisting and drafting, their petal-like twisted structure endows the fibers with a high specific surface area, enabling them to complete dye adsorption within 30 min. Simultaneously, compared with that a single fiber with the same thickness, the volume-specific resistance of a multistranded twisted graphene fiber is reduced 2.4 times. During force sensing, the twisted structure of multistranded fibers exhibits varying simultaneity of fiber fracture, with excellent resistance sensitivity reaching up to 55%. The multistranded twisted flexible graphene fibers demonstrate excellent robustness. Electroluminescent flexible devices prepared with graphene fibers and fiber braided fabrics with different organizational structures as electrodes emit highly saturated short-wave blue light during long-term multiple use. Therefore, multistranded twisted graphene fibers exhibit considerable potential for future applications in wearable multicolor smart displays and flexible optical signal electronics. © 2023, The Authors. All rights reserved.

关键词： Graphene

Graphene/Electrospun Carbon Nanofiber Sponge composites Induced by Magnetic Particles for Mutil-Functional Pressure Sensor

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SSRN 2022年

作者： Ai, Jiao Cheng, Si-Rong Miao, Yu-Jia Li, Ping Zhang, Huan-Xia Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province Jiaxing University Jiaxing314001 China Zhejiang Sci-Tech University Hangzhou China Jiaxing Nanhu university Jiaxing314001 China College of Textiles Donghua University Shanghai China

Here, an innovative approach to fabricate lightweight, highly sensitive three-dimensional (3D) conductive nanofiber sponges for pressure sensors was reported. 3D sponges were prepared by self-assembly of electrospun carbon nanofibers/aminated Fe 3 O 4 and reduced graphene oxide (rGO) nanosheets. Specifically, an external magnetic field was applied to further regulate the orientation and distribution of the graphene nanosheets through the induction of the magnetic field on the nanomagnetons to improve the performance of the sponge. After the external magnetic field conditions were changed, the prepared rGOF/CF composite sponge material showed high sensitivity (0.56 Kpa −1 ), the volume conductivity of the conductive sponge significantly improved, the conductivity measured at both ends dropped sharply by more than 30–60 times from 6154.4 Ω∙m. The rGOF/CF composite sponge has certain magnetic properties. It could be applied to the switch of magnetic attraction. Meanwhile, the composite sponge material exhibited good cyclic stability under different pressure compressions and an obvious response to small pressures. © 2022, The Authors. All rights reserved.

关键词： Magnetic properties

Topological design and synthesis of high-spin aza-triangulenes without Jahn-Teller distortions

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arXiv

arXiv 2023年

作者： Lawrence, James He, Yuanyuan Wei, Haipeng Su, Jie Song, Shaotang Rodrigues, Alina Wania Miravet, Daniel Hawrylak, Pawel Zhao, Jianwei Wu, Jishan Lu, Jiong Department of Chemistry National University of Singapore 117543 Singapore College of Material and Textile Engineering Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province Jiaxing University Zhejiang Jiaxing314001 China Department of Physics University of Ottawa OttawaONK1N 6N5 Canada Institute for Functional Intelligent Materials National University of Singapore 117544 Singapore

The atomic doping of open-shell nanographenes enables the precise tuning of their electronic and magnetic state, which is crucial for their promising potential applications in optoelectronics and spintronics. Among this intriguing class of molecules, triangulenes stand out with their size-dependent electronic properties and spin states, which can also be influenced by the presence of dopant atoms and functional groups. However, the occurrence of Jahn-Teller distortions in such systems can have a crucial impact on their total spin and requires further theoretical and experimental investigation. In this study, we examine the nitrogen-doped aza-triangulene series via a combination of density functional theory and on-surface synthesis. We identify a general trend in the calculated spin states of aza-[n]triangulenes of various sizes, separating them into two symmetry classes, one of which features molecules that are predicted to undergo Jahn-Teller distortions that reduce their symmetry and thus their total spin. We link this behavior to the location of the central nitrogen atom relative to the two underlying carbon sublattices of the molecules. Consequently, our findings reveal that centrally-doped aza-triangulenes have one less radical than their undoped counterparts, irrespective of their predicted symmetry. We follow this by demonstrating the on-surface synthesis of π-extended aza-[5]triangulene, a large member of the higher symmetry class without Jahn-Teller distortions, via a simple one-step annealing process on Cu(111) and Au(111). Using scanning probe microscopy and spectroscopy combined with theoretical calculations, we prove that the molecule is positively charged on the Au(111) substrate, with a high-spin quintet state of S = 2, the same total spin as undoped neutral [5]triangulene. Our study uncovers the correlation between dopant position and the radical nature of high spin nanographenes, providing a novel strategy for the design and development of these nan

关键词： Density functional theory

A Waffle Structured composite for Rcs Reduction Via Absorption and Scattering Mechanisms

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SSRN 2022年

作者： Jiang, Qian Duan, Jinming Uddin, Azim Wu, Xianyan Yi, Honglei Wu, Liwei Tianjin and Ministry of Education Key Laboratory for Advanced Textile Composite Materials Tiangong University Tianjin300387 China School of Textile Science and Engineering Tiangong University Tianjin300387 China School of Materials Science and Engineering Zhejiang University Hangzhou310027 China Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province College of Material and Textile Engineering Jiaxing University Jiaxing314001 China

A radar absorbing material named waffle structured composite (WSC) was proposed based on the periodic structure element formed in double-sided knitting process. The unique pattern shaped by the knitted loops achieved the collaborative mechanisms of absorption and scattering. The radar cross section (RCS) below -10dB was achieved ranging from 12 to 18 GHz for WSC in course direction, and RCS reduction peak can reach to -30dB. Through the S-parameter analysis and simulation, the RCS reduction mechanism was revealed for WSC in both wale and course direction. It was found that the low-frequency RCS reduction in the wale direction was mainly dominated by the absorption mechanism, and the high-frequency RCS reduction in the course direction was led by the scattering mechanism. Furthermore, to further explore the scattering and absorption mechanism, phase difference, dielectric loss and magnetic loss were investigated in details. It was verified that the absorption of WSC is mainly originated from dielectric loss with slight magnetic loss, and Debye relaxation plays the important role in dielectric loss. The WSC proposed in this paper is equipped with characteristics of good RCS reduction and continuous large-scale manufacture, which is promising in practical engineering application of radar stealth. © 2022, The Authors. All rights reserved.

关键词： Radar cross section

Effect of Thickness Ratio on Interfacial Morphology and Mechanical Properties of Mg/Al composite Plates in Differential Temperature Asymmetrical Rolling

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SSRN 2022年

作者： Zhi, Chenchen Wu, Zhenyu Ma, Lifeng Huang, Zhiquan Zheng, Zebang Xv, Haijie Jia, Weitao College of Mechanical Engineering Taiyuan University of Science and Technology Taiyuan030024 China Heavy Machinery Engineering Research Center Ministry of Education Taiyuan University of Science and Technology Taiyuan030024 China State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment School of Materials Science and Engineering Northwestern Polytechnical University Xi’an710072 China Part Rolling Key Laboratory of Zhejiang Province Ningbo University Ningbo315211 China

In order to investigate the effects of different thicknesses of matrix and clad plates on the microstructure, interface morphology, and mechanical properties of Mg/Al composite plates, Mg/Al composite plates with different thickness ratios were prepared by differential temperature asymmetrical rolling + isothermal symmetrical rolling method. It is demonstrated that the maximum thickness of Mg 17 Al 12 and Al 3 Mg 2 is 15.8μm when the thickness ratio is 2, and the shear fracture of the composite plate occurs in the metal compound layer. With the increase of the thickness ratio, the intermetallic compounds gradually decrease, and the relative deformation rate of matrix and clad plates gradually converges under the influence of Mg layer work hardening. When the thickness ratio is 5, the diffusion of Mg elements is the most obvious on the Al layer. The bonding strength and plasticity of the composites increase first and then decrease with the increase of thickness ratio, while the tensile strength decreases gradually. When the thickness ratio is 3, the composite plates obtain the optimal comprehensive mechanical properties, the maximum bonding strength is 94.2 MPa;the tensile strength is 277.4 MPa, and the maximum elongation is 18.7%. © 2022, The Authors. All rights reserved.

关键词： Tensile strength