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Cell osteogenic bioactivity mediated precisely by varying scaled micro-pits on ordered micro/nano hierarchical structures of titanium

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Regenerative Biomaterials 2022年第1期9卷 597-611页

作者： Yanmei Zhang Xiankuan Wang Yaxian Li Jianhe Liang Pinliang Jiang Qiaoling Huang Yun Yang Hongping Duan Xiang Dong Gang Rui Changjian Lin State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Research Institute for Biomimetics and Soft Matter Fujian Provincial Key Laboratory for Soft Functional Materials ResearchCollege of Physical Science and TechnologyXiamen UniversityXiamen 361005China Beijing Engineering Laboratory of Functional Medical Materials and Devices Beijing Medical Implant Engineering Research CenterBeijing Naton Technology Group Co.LtdBeijingChina Department of Orthopedics Surgery The First Affiliated Hospital of Xiamen UniversityXiamenFujian 361003China Tan Kah Kee Innovation Laboratory XiamenFujian 361005China

Hierarchical surface structures with micro–nano scale play a crucial role in regulation of cell proliferation and osteogenic *** has been proven that cells are extremely sensitive to the nanoscaled structure and show multifarious *** a vital function of microstructure on osseointegration has been confirmed,the cell performances response to different microscaled structure is needed to be further dissected and in depth *** this work,the ordered micro–nano hierarchical structures with varying micro-scaled pits were precisely fabricated on titanium successfully by the combination of electrochemical,chemical etching and anodization as *** vitro systematical assessments indicated that the micro–nano multilevel structures on titanium exhibited excellent cells adhesion and spreading ability,as well as steerable proliferation and osteogenic differentiation *** is shown that smaller micro-pits and lower roughness of the hierarchical structures enabled faster cell *** cell growth was delayed on micro–nano titanium with relatively larger cell-match-size micro-pits and roughness,osteogenic-specific genes were significantly ***,the alkaline phosphatase activity,collagen secretion and extracellular matrix mineralization of MC3T3-E1 on multiscaled titanium were suppressed by a large margin after adding IWP-2(an inhibitor of Wnt/b-catenin signal pathway),indicating this pathway played a crucial part in cell osteogenic differentiation modulated by micro–nano structures.

关键词： electrochemical self-organizing etching varying micro-scaled pits osteogenic Wnt/b-catenin

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Three consecutive quantum anomalous Hall gaps in a metal-organic network

arXiv

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arXiv 2023年

作者： Yu, Xiang-Long Cao, Tengfei Wang, Rui Quan, Ya-Min Wu, Jiansheng Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China International Quantum Academy Shenzhen518048 China State Key Laboratory of Solidification Processing Center for Advanced Lubrication and Seal Materials School of Materials Science and Engineering Northwestern Polytechnical University Shanxi Xi’an710072 China Institute for Structure and Function Department of Physics Center for Quantum Materials and Devices Chongqing University Chongqing400044 China Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei230031 China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China

In the quantum anomalous Hall (QAH) effect, chiral edge states are present in the absence of magnetic fields due to the intrinsic band topology. In this work, we predict that a synthesized two-dimensional metal-organic material, a Fe(biphenolate)3 network, can be a unique QAH insulator, in which there are three consecutive nontrivial bandgaps. Based on first-principles calculations with effective model analysis, we reveal such nontrivial topology is from the 3dxz and 3dyz orbitals of Fe atoms. Moreover, we further study the effect of substrates, and the results shows that the metallic substrates used in the experiments (Ag and Cu) are unfavorable for observing the QAH effect whereas a hexagonal boron nitride substrate with a large bandgap may be a good candidate, where the three consecutive QAH gaps appear inside the substrate gap. The presence of three consecutive bandgaps near the Fermi level will significantly facilitate observations of the QAH effect in experiments. Copyright © 2023, The Authors. All rights reserved.

关键词： Energy gap

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Acoustic Multiplexing Based on Higher-Order Topological Insulators with Combined Valley and Layer Degrees of Freedom

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Physical Review Applied 2023年第4期19卷 044055-044055页

作者： Le Liu Jin-Guo Hua Xiujuan Zhang Ming-Hui Lu Yan-Feng Chen National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 China School of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing 210093 China

Higher-order topological insulators (HOTIs) in classical systems, featuring robust multidimensional boundary states protected by various crystalline symmetries, have become a fast-growing research branch in the vast topological family. Therein, valley pseudospins and layer pseudospins are separately introduced as extra degrees of freedom (DOFs) to manipulate topological phases. Here, we experimentally demonstrate that, by combining valley and layer DOFs, intriguing HOTIs can be realized. They host topological edge and corner states that are simultaneously valley dependent and layer polarized. We implement such HOTIs in bilayer sonic crystals (SCs) consisting of carefully stacked triangular scatterers. By rotating the scatterers, the valley and layer DOFs are interplayed, producing combined valley-layer polarizations. Correspondingly, the SCs exhibit versatile sound transport and localization. This inspires us to design an acoustic multiplexer, where sound waves can be guided along specific directions or trapped at specific locations, depending on the excitation frequencies. Our study of higher-order topology based on the interplay between valley and layer DOFs enriches the topological physics. With combined valley and layer polarizations, the resultant HOTIs also offer versatile ways to guide and/or trap sound waves, which have potential applications in integrated and multiplexing phononic devices.

关键词： Acoustic metamaterials Acoustic wave phenomena Edge states Topological insulators Bilayer films Multiplexers Phononic crystals

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Improved Tribological Properties of W-S-C-N Film by the Friction-Induced Well Crystallized Thick Transfer Layer

SSRN

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SSRN 2024年

作者： Wang, Desheng Li, Zhaowang Guo, Longbang Ye, Qinlin He, Jun Liu, Zhilu Jiang, Dong Fu, Yanlong Gao, Xiaoming Sun, Jiayi Weng, Lijun Hu, Ming State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Lanzhou Institute of Chemical Physics China

Pure WS2, W-S-C, W-S-N and W-S-C-N films were prepared by sputtering two WS2 targets and an additional WC target in Ar and N2 atmosphere. Different from the nano-crystalline structure for WS2 and W-S-C film, both the W-S-N and W-S-C-N exhibited completely amorphous and more compact structure. The formed W-C and W-N bonds in the films contributed to obvious increased hardness. The prepared W-S-C-N film showed a very low average COF and wear rate, much lower than that for pure WS2 and W-S-C film. Meanwhile, W-S-C-N film exhibited a low COF fluctuation during long sliding cycles compared to W-S-N film. The improved hardness and the friction-induced well crystallized stable transfer film contributed to the superior tribological performance of the W-S-C-N film. © 2024, The Authors. All rights reserved.

关键词： Tribology

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Wear-Resistant Phenolic Composites Reinforced with Attapulgite and Short Carbon Fibers for Applications Subjected to Both Dry and Oil-Lubricated Sliding

SSRN

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SSRN 2024年

作者： Zhang, Ga Wang, Xiaodong Li, Huan He, Ren Li, Guitao Wang, Xiaoxin College of Polymer Science and Engineering Qingdao University of Science and Technology Qingdao266044 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Qingdao Center of Resource Chemistry and New Materials Qingdao266071 China

Attapulgite (AT) nanofibers were integrated into phenol-formaldehyde resin (PF) and PF composites reinforced with short carbon fibers (CF). The hybrid nanocomposites reinforced with both AT and CF exhibit very high mechanical strengths. The addition of AT into PF improves greatly the wear resistance for sliding under dry and oil-lubrication conditions. Interestingly, AT and CF lower synergistically the friction coefficient of PF subjected to harsh dry sliding conditions. The hybrid nanocomposites exhibit high tribological performance under both dry and oil-lubrication conditions. Tribofilms’ nanostructures were comprehensively analyzed for disclosing dominant tribological mechanisms. Outcome of this work provides new ideas for developing tribo-materials of a high adaptability to multiple dry/oil-lubrication conditions. © 2024, The Authors. All rights reserved.

关键词： Nanofibers

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Effect of Seawater Temperature on the Corrosion and Cavitation Erosion-Corrosion Resistance of Al10cr28co28ni34high-Entropy Alloy Coating

SSRN

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SSRN 2023年

作者： Cao, Haobo Hou, Guoliang Xu, Tongchao Ma, Junkai Wan, Hongqi An, Yulong Huidi, Zhou Chen, Jianmin State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

The influence of temperature on the corrosion and cavitation erosion-corrosion (CE-C) behavior of Al10Cr28Co28Ni34 high-entropy alloy (HEA) coating in seawater was investigated. Interestingly, the corrosion resistance of the coating progressively diminished with an increase in seawater temperature, but the CE-C resistance demonstrated a trend of initial increase followed by a decrease. At higher seawater temperature, the resistance of the coating surface and the destructive force of the bubbles were respectively enhanced and weakened due to the increase in oxide film thickness, maximum bubble size, and collapse time, together leading to a reduction in the damage degree to the coating. © 2023, The Authors. All rights reserved.

关键词： Corrosion resistance

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Electrically controlled nonvolatile switching of single-atom magnetism in a Dy@C84 single-molecule transistor

arXiv

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arXiv 2024年

作者： Wang, Feng Shen, Wangqiang Shui, Yuan Chen, Jun Wang, Huaiqiang Wang, Rui Qin, Yuyuan Wang, Xuefeng Wan, Jianguo Zhang, Minhao Lu, Xing Yang, Tao Song, Fengqi National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics Nanjing University Nanjing210093 China Institute of Atom Manufacturing Nanjing University Suzhou215163 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China School of Materials Science and Engineering Hefei University of Technology Hefei230009 China MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter School of Physics Xi'an Jiaotong University Xi’an710049 China Center for Quantum Transport and Thermal Energy Science School of Physics and Technology Nanjing Normal University Nanjing210023 China School of Electronic Science and Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210023 China

Single-atom magnetism switching is a key technique towards the ultimate data storage density of computer hard disks and has been conceptually realized by leveraging the spin bistability of a magnetic atom under a scanning tunnelling microscope. However, it has rarely been applied to solid-state transistors, an advancement that would be highly desirable for enabling various applications. Here, we demonstrate realization of the electrically controlled Zeeman effect in Dy@C84 single-molecule transistors, thus revealing a transition in the magnetic moment from 3.8 μB to 5.1 μB for the ground-state GN at an electric field strength of 3 − 10 MV/cm. The consequent magnetoresistance significantly increases from 600% to 1100% at the resonant tunneling point. Density functional theory calculations further corroborate our realization of nonvolatile switching of single-atom magnetism, and the switching stability emanates from an energy barrier of 92 meV for atomic relaxation. These results highlight the potential of using endohedral metallofullerenes for high-temperature, high-stability, high-speed, and compact single-atom magnetic data storage. © 2024, CC BY.

关键词： Magnetic storage

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Demonstration of 420GHz highly scaled InAlN/GaN HEMTs by Electron Beam Lithography

Demonstration of 420GHz highly scaled InAlN/GaN HEMTs by Ele...

引用

Advanced Patterning Solutions (IWAPS), International Workshop on

作者： Jiaheng He Zhe Cheng Chengcheng Li Shujie Xie Xuankun Wu Lian Zhang Chang Wu Yun Zhang Laboratory of Solid State Optoelectronics Information Technology Institute of Semiconductors Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing China Hubei Jiufengshan Laboratory Wuhan China

GaN-based high electron mobility transistors (HEMTs) are promising candidates for millimeter wave amplifiers above 100 GHz for 6G communications. To satisfy those requirements, a maximum oscillation frequency $(\mathbf{f}_{\max})$ surpassing 400 GHz is essential, necessitating the deployment of advanced down-scaling and patterning technologies. Through the utilization of electron beam lithography, ultra-scaled InAlN/GaN HEMTs on sapphire with T-gates with gate length of~60 nm and source-drain distance of~300 nm were fabricated, reaching $\mathrm{f}_{\max}$ over 420 GHz with a corresponding f T exceeding 150 GHz. To the best of the author's knowledge, these scaled HEMTs exhibit the highest fmax among reported HEMTs on sapphire.

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Unexpected solid Shear Response of Liquid-Like Nanoconfined Water Films and the Effect on Friction

SSRN

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SSRN 2024年

作者： Zhao, Yang Bao, Luyao Fan, Xiaoli Zhou, Feng State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials School of Materials Science and Engineering Northwestern Polytechnical University Xi’an710072 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai264006 China

Here we find the general and abnormal stick-slip friction of nanoconfined water by extensive molecular dynamics simulations. Specifically, water films exhibit general stick-slip behavior when confined below 1 nm, independent of the water phase, surface wettability, and solid lattice structure. However, at confinement distances of 0.7 and 0.9 nm water films are in liquid-like states, which contradicts the common belief that only solid-like lubricant films can produce stick-slip friction. This unexpected behavior is attributed to the nature of short-time-scale ordered but long-time-scale disordered. Further, we reveal the velocity dependence of friction, which is mainly linear at >= 1 nm, logarithmic at 0.8-0.9 nm, and plateau-like at 0.6-0.7 nm, and give theoretical descriptions by extending the Kramer's theory of activated processes. © 2024, The Authors. All rights reserved.

关键词： Shear thinning

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Structure design enables stable anionic and cationic redox chemistry in a T2-type Li-excess layered oxide cathode

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science Bulletin 2022年第4期67卷 381-388,M0004页

作者： Xin Cao Haifeng Li Yu Qiao Min Jia Hirokazu Kitaura Jianan Zhang Ping He Jordi Cabana Haoshen Zhou Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Tsukuba 305-8568Japan Department of Chemistry University of Illinois at ChicagoChicagoIL 60607USA Center of Energy Storage Materials&Technology College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsNational Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Graduate School of System and Information Engineering University of TsukubaTsukuba 305-8573Japan College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Coupled with anionic and cationic redox chemistry,Li-rich/excess cathode materials are prospective high-energy-density candidates for the next-generation Li-ion ***,irreversible lattice oxygen loss would exacerbate irreversible transition metal migration,resulting in a drastic voltage decay and capacity ***,a metastable layered Li-excess cathode material,T2-type Li_(0.72)[Li_(0.12)Ni_(0.36)Mn_(0.52)]O_(2),was developed,in which both oxygen stacking arrangement and Li coordination environment fundamentally differ from that in conventional O3-type layered *** means of the reversible Li migration processes and structural evolutions,not only can voltage decay be effectively restrained,but also excellent capacity retention can be achieved upon long-term ***,irreversible/reversible anionic/cationic redox activities have been well assigned and quantified by various in/ex-situ spectroscopic techniques,further clarifying the charge compensation mechanism associated with(de)*** findings of the novel T2 structure with the enhanced anionic redox stability will provide a new scope for the development of high-energy-density Li-rich cathode materials.

关键词： Cathode materials Layered oxides Voltage decay Lattice oxygen release Structural stability

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