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SSRN 2024年

作者： Liang, Jin Yang, Guang Lei, Tian Zhang, Yaxi Yin, Zhao Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology Changsha410004 China College of Material Science and Engineering Central South University of Forestry andTechnology Changsha410004 China

The present study involves the in-situ preparation of a NiMoO4-C@NiFeMoSe composite electrocatalyst on a nickel foam (NF) substrate, achieved through the combined use of hydrothermal and electrodeposition techniques. After the hydrothermal process, the NF substrate was enveloped by a notably rugged composite structure composed of carbon sub-micron spheres uniformly dispersed and interlinked with NiMoO4 nanorods. To further enhance the electrocatalytic efficiency, a NiFeMo-based selenide was electrodeposited onto the surface of the NiMoO4-C/NF composite electrode. The NiMoO4-C@NiFeMoSe/NF composite electrode exhibited exceptional OER catalytic activity in a 1 M KOH solution, displaying an overpotential of merely 228 mV at a current density of 50 mA·cm-2 and a Tafel slope of 35.9 mV·dec-1, significantly lower than that of the blank NF. Moreover, for overall water splitting, the two-electrode NiMoO4-C@NiFeMoSe/NF||Pt-C/NF electrolyzer required a low potential of 1.48 V to achieve a current density of 10 mA·cm-2 and displayed exceptional long-term durability. © 2024, The Authors. All rights reserved.

关键词： Nickel compounds

Superior Mechanical Properties and Wear Resistance of Copper/Graphite Metallic Composites Fabricated with Fibrous Copper Powder

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SSRN 2024年

作者： Xu, Yuxuan Zhou, Peiyu Chen, Qi Zhou, Haibin Deng, Minwen Han, Yong Yao, Pingping State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Central South University of Forestry & Technology Changsha410004 China

Fibrous copper powder (FC) featuring fibrous topography is fabricated by water-atomization, cyclic oxidation, and grinding. Prominent hardness and deformation resistance of FC are identified compared to electrolytic copper powders (EC). Copper/graphite metallic composites with FC (CCF) are endowed with higher hardness (increased by 22.65%) and tensile modulus (increased by 135.4%). The CCF shows stable friction coefficient, and the wear resistance is improved by 52.1%, ascribed to the ideal mechanically-bonded Cu/ graphite interfaces and higher strength of the matrix. The integral grains on the matrix and approximately 5 μm stress layer around the Cu/graphite interfaces of CCF contribute to excellent mechanically-bonded, where the nano-hardness and elastic modulus of CCF are increased by around 300% compared to CCE, exerting superiority of the mechanically-bonded Cu/ graphite interfaces. © 2024, The Authors. All rights reserved.

关键词： Friction

The Effect of Copper Particles Coated with Graphene Oxide on Tribological Properties and Tribo-Layers of Copper Metal Matrix Composites

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SSRN 2024年

作者： Xu, Yuxuan Zhou, Peiyu Chen, Qi Liu, Ziyi Wang, Xing Deng, Minwen Zhou, Haibin Han, Yong Yao, Pingping State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Central South University of Forestry & Technology Changsha410004 China

By coating graphene oxide on the Cu powder (Cu@GO) and producing Cu@GO-reinforced Copper metal matrix composites (CMMCs), we demonstrate the damages of worn surfaces can be well-relieved hence the tribological performances can be prominently enhanced. In particular, the wear loss of the CMMC reinforced with 5 wt.% contents of Cu@GO is drastically reduced by 49% and maintains a steady state under 20 friction tests. The reason is found to be directly related to the introduction of graphene, which, not only endows CMMCs with high thermal capacity and thermal diffusivity, contributing to decreasing oxidation wear, but also stabilizes the tribo-layer hence making an integrated mechanical mixture layer, inhibiting Cu and Fe deformation and maintaining the integrity of the graphite particles. © 2024, The Authors. All rights reserved.

关键词： Graphene

The 2^(nd)Asian Conference on Porphyrins,Phthalocyanines and Related materials

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Chinese Chemical Letters 2024年第7期35卷 1-3页

作者： Gaojie Zhu Zhen Yang Shijun Li Weihua Zhu Rui Cao Junlong Zhang Jianzhang Zhao Jonathan L.Sessler Xunjin Zhu Jianxin Song Yongshu Xie Jianzhuang Jiang Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai 200237China College of Material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material Technology of Ministry of EducationHangzhou Normal UniversityHangzhou 311121China School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang 212013China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi'an 710119China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Fine Chemicals Frontier Science Center for Smart MaterialsSchool of Chemical EngineeringDalian University of TechnologyDalian 116024China Department of Chemistry The University of TexasAustinTexas 78712-1224United States Department of Chemistry and Institute of Advanced Materials Hong Kong Baptist UniversityHong Kong 999077China Key Laboratory of Chemical Biology and Traditional Chinese Medicine(Ministry of Educational of China) Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan ProvinceCollege of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

In the past decades,porphyrins,phthalocyanines and related materials have attracted significant attention due to their diverse and brilliant structures[1,2],as well as their unique electronic structures and photophysi... 详细信息

关键词： cyanine phthalocyanine Porphyrin

Microstructure Evolution and Thermochemical Interaction of Dysprosia Stabilized Zirconia with Cmas Attack

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SSRN 2024年

作者： Cheng, Huicong Wang, Yalei Liu, Huaifei Wu, Nannan Xiong, Xiang State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Central South University of Forestry & Technology Changsha410004 China College of Materials Science and Engineering Changsha University of Science and Technology Changsha410076 China

Microstructure evolution and thermochemical interaction of high-potential 10 wt.% dysprosia stabilized zirconia (DySZ) with CMAS attack are systematically investigated. Preferential grain boundary corrosion between CMAS and DySZ ceramics can be attributed to inherent solute atomic segregation characteristics of dysprosium (Dy) in DySZ. High optical basicity (OB) values in Dy-enriched regions promotes the CMAS reactivity with grain boundaries. Thermochemical reaction between DySZ and CMAS lead to DySZ destabilization through in-situ phase transformation and dissolution recrystallization. It is proposed that improving DySZ corrosion resistance can be achieved by decreasing grain boundary segregation of Dy or promoting the crystallization precipitation kinetics of CMAS. © 2024, The Authors. All rights reserved.

关键词： Thermal barrier coatings

Actively reconfigurable valley topological edge and corner states in photonic crystal based on phase change material Ge2Sb2Te5

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SSRN 2023年

作者： He, Meng-Dong Li, Wei Peng, Yu-Xiang Su, Pei-Hao Li, Jian-Bo Wang, Kai-Jun Liu, E-Xian Liu, Jian-Qiang College of Science Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology Central South University of Forestry and Technology Changsha410004 China College of Science Jiujiang University Jiujiang332005 China

The immunity against backscattering and structural defects of topological states gives them a distinct advantage in the exploration and design of high precision low-loss optical devices. However, the operating bandwidth of topological states in a certain photonic structure is difficult to be actively tuned and flexibly reconfigured. In this paper, we propose a valley topological photonic crystal (TPC) composed of two honeycomb photonic crystals inverse to each other, consisting of hexagon silicon and Ge2Sb2Te5 (GST) rods. When GST transforms from amorphous to crystalline phase, the edge band of TPC appears a large redshift and is inversed from "∪" to "∩" shape with topological phase transition, which enables active tuning of the operating bandwidth and the propagation direction of topological edge states. Both the topological edge and corner states in a triangular structure constructed by TPC can be simultaneously adjusted and reconfigured via GST phase transition, companied with the change of group number of corner states. Using the adjustability of topological edge states and the electromagnetic coupling between two different topological bearded interfaces, we achieve a multichannel optical router with a high tuning degree of freedom, where channels can be actively reconfigured and their on/off states can be freely switched. Our work provides a strategy for active regulation of topological states and may be beneficial for development of reconfigurable topological optical devices. © 2023, The Authors. All rights reserved.

关键词： Phase change materials

Construction of Polyaniline/Mno2 Core-Shell Nanocomposites in Carbonized Wood Tracheids for High-Performance All-Solid-State Asymmetric Supercapacitors

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SSRN 2022年

作者： Wang, Luchi Wang, Xiaoman Ouyang, Jie Guo, Yuhang Xiong, Wanning Zhao, Linlin Li, Mengyao Hua, Ziheng Du, Kun Zhou, Cui Luo, Yongfeng Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology College of Science Central South University of Forestry and Technology Hunan Changsha410004 China

Polyaniline (PANI) nanomaterials or carbon nanotubes (CNTs) are first synthesized on the tracheid wall of activated wood carbon (AWC) to obtain PANI@AWC and CNT@AWC, respectively. Then MnO 2 nanosheets are electrodeposited on the outer surface of the PANI nanomaterials to form a core-shell structure. The introduction of PANI in wood tracheids not only increases the loading of MnO 2 , but also improves the electrical conductivity and structural stability, and the core-shell structure can synergistically store energy. Then using the MnO 2 /PANI@AWC composite electrode as an anode and using CNT@AWC as a cathode, a high-performance all-solid-state asymmetric supercapacitor with high energy density and high cycling stability is successfully constructed. This supercapacitor has a wide working voltage of 0-1.8 V and a high energy density of 0.875 mWh cm −2 at 9 mW cm −2 . The capacitance retention rate is as high as 93.21% after 10000 charge-discharge cycles. Therefore, wood-based composites with aligned tracheids have great potential in the development of high-power and high-energy-density energy storage devices. © 2022, The Authors. All rights reserved.

关键词： Capacitance

Enhancing Wettability and Water Resistance of Coatings Using Tung Oleic Acid-Based Gemini Wetting Agent Via Fischer Esterification

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SSRN 2024年

作者： Song, Yuwei Ge, Yi Zhuo, Yaowen Yang, Yan Liao, You-Wei Hunan University of Science and Technology China Waterborne Additive Co. Ltd. Yueyang Environmental Protection Additives Engineering Technology Research Center Yueyang414000 China Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Central South University of Forestry & Technology Changsha410004 China

As societal awareness of environmental concerns grows, there is a gradual transition towards more environmentally friendly aqueous products, replacing traditional solvent-based ones. This study employed Fischer esterification to graft tung oil acid (i.e., eleostearic acid) onto 2,5,8,11-tetramethyl-5-decyne-4,7-diol, ethoxylated (TDDE) using p-toluenesulfonic acid as a catalyst. The resulting product, polyether alkynyl alcohol wetting agent (ETDDE), consisted of a tung oil monomer chain (hydrophobic part) and a polyether chain (hydrophilic part). The successful synthesis of ETDDE was confirmed through infrared spectroscopy analysis, Gel Permeation Chromatography testing, and acid value determination. The results showed that the surface tension, defoaming ability, coating gloss, wettability, and water resistance of ETDDE improved with the ratio of eleostearic acid to TDDE. © 2024, The Authors. All rights reserved.

关键词： Esters

Sulfureted Polyacrylonitrile Derived Carbon Encapsulated Silicon as High-Performance Anode Material for Lithium-Ion Batteries

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SSRN 2022年

作者： Qin, Rongrong Wang, Zhuang Li, Jinlei Deng, Lingfeng School of Materials Science and Engineering Central South University of Forestry and Technology Changsha China Hunan Province Key Laboratory of Materials Surface and Interface Science and Technology China

Silicon-based materials are the most promising anode materials for the next generation of lithium-ion batteries. However, the low conductivity, large volume effect and continuous formation of solid-electrolyte-interface (SEI) film, resulted in low rate-capability, severe electrode pulverization and aerogenesis, hinders their practical application. To enhance the electrochemical performance of silicon-based materials, in this work, sulfur-doped carbon derived from sulfurized polyacrylonitrile is used as carbon matrix for confining and encapsulating nano silicon particles. It is found that the sulfur doping can effectively enhance the cycle stability of silicon-based composite. The as-prepared silicon/sulfur-doped carbon composite with a moderate silicon content (~16.7 wt%) exhibits an initial discharge capacity of 1735 mA h g -1 and maintained at 699 mA h g -1 after 200 cycles. Even at the current density of 1 A g -1 , the 0.5gSi@SPANdC composite also exhibits good cycle stability and relatively high reversible capacity of 546.1mAh g -1 after 400 cycles. © 2022, The Authors. All rights reserved.

关键词： Lithium-ion batteries

Superhydrophobic Coating Constructed from Rosin Acid and Tio2 Used as Blood Repellent Dressing

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SSRN 2022年

作者： Wang, Yingxuan Li, Zhaoshuang Wang, Jiping Wang, Jingran Li, Xiangzhou Kuang, Chuntao College of Materials Science and Engineering Central South University of Forestry & Technology Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Changsha410004 China

Fabrication of superhydrophobic coating is essential for blood repellent dressing to avoid excessive blood loss which can damage human health and even endanger life. In this study, we prepared a durable superhydrophobic coating based on rosin acid and TiO 2 for blood repellent dressing with a water contact angle of 155.7° and a sliding angle of 5°. Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), X-ray spectroscopy (XPS) were used to characterize coating morphology and chemical composition. Water droplets were spherical and non-stick on the surface of the dressing. Meanwhile, the superhydrophobic coating can withstand at least 30 sandpaper wear cycles and 16 washing treatments without losing its superhydrophobic properties. In addition, the superhydrophobic coating exhibited excellent antimicrobial activities against Gram-positive Staphylococcus aureus ( S. aureus ) (with log reduction = 1.73) and Gram-negative Escherichia coli ( E. coli ) (with log reduction = 1.74), and effectively prevented biofilm formation. Based on in vitro experiments, it was confirmed that the superhydrophobic coating can reduce blood loss as well as high air permeability. Therefore, the superhydrophobic coating fabricated in this work provide a facile strategy to prepare novel blood repellent dressing, which may have promising applications in wound dressings. © 2022, The Authors. All rights reserved.

关键词： Coatings