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Fluorographene with Narrow Lateral Size and Thickness Distributions Prepared for Enhancing lubrication Performance of Bentonite Grease

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1294-1302页

作者： xiang Shuo lu Peng ZHANG Qinhui XIAO Bowen YANG Xin* ZHANG Peili MA Pengfei HE Yan LI Xuebin Army Logistics Academy of PLA Chongqing 401311China Naval Aeronautical University Yantai 2640003China Unit 32568 Shaoguan 512131China

Fluorographene(FG)with narrow lateral size and thickness distributions was prepared by a liquid-phase exfoliation method,based on liquid cascade *** Rtec MFT-5000 tribo-meter was used to investigate the lubricating performance of bentonite grease enhanced by the as-prepared *** results showed that the coefficient of friction and the wear volume of bentonite grease with 0.3 wt%FG were decreased by 20.4%and 44.9%,respectively,as compared to those of the base *** main reason is that FG can promote the formation of the tribo-chemical reaction film consisting of complex carbon oxide,Fe_(2)O_(3)and FeF_(3)on the friction surface,which can remarkably improve the performance of friction reduction and prevent the appearance of severe wear.

关键词： fluorographene liquid-phase exfoliation bentonite grease lubrication performance

Spectral observation of symmetry-protected selection rules for dynamical high-dimensional parity in alignment magnetic resonance

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Science China(Physics,Mechanics & Astronomy) 2024年第10期Mechanics & Astronomy) .卷 5-15页

作者： Xu-Xing Geng Kai Jin lu Zhou Wang-Wang Tang Guoqing Yang Shangqing Liang Shao-Ping Wu Guang-Ming Huang Gao-xiang Li Department of Physics Huazhong Normal University State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal University College of Electronics and Information Hangzhou Dianzi University

Multidimensional Floquet-driven alignment systems with dynamical symmetry present various exotic phenomena and applications. However, there are challenges in directly characterizing large-spin dynamical symmetry from spectra. Here, we first observe the symmetry-protected selection rules of dynamical high-dimensional parity in a large-spin(F = 4) system. We theoretically construct a Floquet-driven alignment system that can be used to reveal high-dimensional spatiotemporal symmetry. In the experiment, the system is implemented in Cs atomic gas subjected to two-dimensional Floquet-modulated magnetic resonance driving. By developing Floquet detection protocols of alignment double-sided spectra, we directly verify symmetry-protected selection rules of dynamical high-dimensional parity for large-spin systems. This work advances the exploration of dynamical symmetry to large spins, and unravels a universal Floquet scheme for the investigation of symmetry-protected selection rules.

关键词： dynamical high-dimensional symmetry symmetry-protected selection rules large-spin alignment magnetic resonance Floquet two-mode detection

One-step calcination synthesis of interface-coherent crystallized and surface-passivated LiNi_(0.5)Mn_(1.5)O_(4) for high-voltage lithium-ion battery

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Nano Research 2024年第5期17卷 4192-4202页

作者： Min Xu Bifu Sheng Yong Cheng Junjie lu Minfeng Chen Peng Wang Bo Liu Jizhang Chen xiang Han Ming-Sheng Wang Siqi Shi College of Materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037China State Key Laboratory of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005China College of Mathematics and Physics Jinggangshan UniversityJi’an 343009China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Western Digital Corporation 951 Sandisk DrMilpitasCA 95035USA

LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)with a spinel crystal structure presents a compelling avenue towards the development of economic cobalt-free and high voltage(~5 V)lithium-ion ***,the elevated operational voltage of LNMO gives rise to pronounced interfacial interactions between the distorted surface lattices characterized by Jahn-Teller(J-T)distortions and the electrolyte ***,a localized crystallized coherent LaNiO_(3) and surface passivated Li_(3)PO_(4) layer is deposited on LNMO via a one-step calcination *** evidenced by transmission electron microscopy(TEM),time-of-flight secondary ion mass spectrometry(ToF-SIMS)and density functional theory(DFT)calculation,the epitaxial growth of LaNiO_(3) along the LNMO lattice can effectively stabilize the structure and inhibit irreversible phase transitions,and the Li_(3)PO_(4) surface coating can prevent the chemical reaction between HF and transition metals without sacrificing the electrochemical *** addition,the ionic conductive Li_(3)PO_(4) and atomic wetting inter-layer enables fast charge transfer transport ***,the LNMO material enabled by the lattice bonding and surface passivating features,demonstrates high performance at high current densities and good capacity retention during long-term *** rational design of interface coherent engineering and surface coating layers of the LNMO cathode material offers a new perspective for the practical application of high-voltage lithium-ion batteries.

关键词： high-voltage cathode interface-coherent surface passivating electrochemical performance

Mechanical Behavior and Failure Mechanism of an As-Extruded Mg-11wt%Y Alloy at Elevated Temperature

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 969-981页

作者： Lan Zhang Dao-Kui Xu Bao-Jie Wang Cui-Lan lu Shuo Wang xiang-Bo Xu Dong-Liang Wang Xin Lv En-Hou Han School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Institute of Corrosion Science and Technology Guangdong510070China

Through carrying out the high-temperature tensile experiments on an as-extruded Mg-11wt%Y alloy at 350℃,400℃,450℃,500℃and 550℃,the mechanical behavior and fracture mechanisms at elevated temperatures are investigated and *** results show that with the increase of temperature,the yield strength and ultimate tensile strength of the alloy increase at first and then decrease,while that the elongation ratio decreases firstly and then *** the sample being tested at 350℃,the values of yield strength,ultimate tensile strength and the elongation ratio are 188 MPa,266 MPa and 11%,*** 400℃,the yield strength and ultimate tensile strength reach the maximum values of,respectively,198 MPa and 277 MPa,but the elongation ratio is the lowest and its value is only 8%.When the applied temperature is increased to 550℃,the values of yield strength and ultimate tensile strength,respectively,decrease to 140 MPa and 192 MPa and the elongation ratio increases to 38%.Failure analysis demonstrates that the fracture surfaces of different samples are mainly composed of plastic dimples and exhibit the typical characteristic of ductile *** observation to the fracture side surfaces indicates that at the temperatures of 350℃and 400℃,microcracks mainly initiate in the interior of Mg_(24)Y_(5)*** the temperatures are 450℃,500℃and 550℃,the cracks preferentially initiate at the Mg_(24)Y_(5)/α-Mg interfaces.

关键词： Mg-Y alloy High-temperature tensile properties Fracture mechanism Failure analysis

BMP9 induces osteogenic differentiation through up-regulating LGR4 via the mTORC1/ Stat3 pathway in mesenchymal stem cells

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Genes & Diseases 2024年第3期11卷 468-483页

作者： Jie Zhang Jinhai Jiang Hang Liu Shiyu Wang Kaixin Ke Siyuan Liu Yue Jiang lu Liu xiang Gao Baicheng He Yuxi Su Department of Pharmacology School of PharmacyChongqing Medical UniversityChongqing 400016China Key Laboratory of Biochemistry and Molecular Pharmacology of Chongqing Chongqing Medical UniversityChongqing 400016China Department of Orthopedics Second Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China orthopedics Department Children's Hospital of Chongqing Medical UniversityChongqing 400014China China International Science and Technology Cooperation Base of Child Development and Critical Disorders Jiangxi Hospital Affiliated Children's Hospital of Chongqing Medical UniversityJiangxi 330000China National Clinical Research Center for Child Health and Disorders China

Bone defects and non-union are prevalent in clinical orthopedy,and the outcomes of current treatments are often *** tissue engineering offers a promising approach to treating these conditions *** morphogenetic protein 9(BMP9)can commit mesenchymal stem cells to osteogenic lineage,and a knowledge of the underlying mechanisms may help advance the field of bone tissue ***-rich repeats con-taining G protein-coupled receptor 4(LGR4),a member of G protein-coupled receptors,is essential for modulating bone *** study is aimed at investigating the impact of LGR4 on BMP9-induced osteogenesis in mesenchymal stem cells as well as the underlying *** marrow stromal cells from BMp9-knockout mice exhibited diminished LGR4 expression,and exogenous LGR4 clearly restored the impaired osteogenic potency of the bone marrow stromal ***,LGR4 expression was increased by BMP9 in C3H10T1/2 ***4 augmented the benefits of BMP9-induced osteogenic markers and bone formation,whereas LGR4 inhibition restricted these ***,the BMP9-induced li-pogenic markers were increased by LGR4 *** protein levels of Raptor and p-Stat3 were elevated by *** knockdown or p-Stat3 suppression attenuated the osteoblastic markers and LGR4 expression brought on by ***4 significantly reversed the blocking ef-fect of Raptor knockdown or p-Stat3 suppression on the BMP9-induced osteoblastic *** interacts with p-Stat3,and p-Stat3 activates the LGR4 promoter *** conclusion,LGR4 boosts BMP9 osteoblastic potency in mesenchymal stem cells,and BMP9 may up-regulate LGR4 via the mTORC1/Stat3 signal activation.

关键词： BMP9 LGR4 mTORC1 Osteogenic differentiation Stat3

Highly homogeneous zero-index metamaterials make devices more compact and perform better

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Light(Science & Applications) 2024年第5期13卷 806-807页

作者： Wei-xiang Jiang State Key Laboratory of Millimeter Waves School of Information Science and EngineeringSoutheast University210096 NanjingChina

A highly homogeneous microwave zero-index metamaterial based on high-permittivity SrTiO3 ceramics is demonstrated to realize the small-aperture high-directivity *** a novel technique is a remarkable step forward to de... 详细信息

关键词： ceramics SrTiO3 Highly

Tunable near-infrared light emission from layered TiS_(3) nanoribbons

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Frontiers of physics 2024年第4期19卷 103-111页

作者： Junrong Zhang Cheng Chen Yanming Wang Yang lu Honghong Li Xingang Hou Yaning Liang Long Fang Du xiang Kai Zhang Junyong Wang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Frontier Institute of Chip and System Fudan UniversityShanghai 200438China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China College of Energy&Power Engineering Inner Mongolia University of TechnologyHohhot 010051China

The low-dimensional light source shows promise in photonic integrated *** layered van der Waals material that exhibits luminescence in the near-infrared optical communication waveband is an essential component in on-chip light ***,the tunable near-infrared photoluminescence(PL)of the air-stable layered titanium trisulfide(TiS3)is *** with iodine particles as a transport agent,TiS3 grown by chemical vapor transport using sulfur powder as a transport agent has fewer sulfur vacancies,which increases the luminescence intensity by an order of *** PL emission wavelength can be regulated in the near-infrared regime by thickness *** addition,we observed an interesting anisotropic strain response of PL in layered TiS3 nanoribbon:a blue shift of PL was achieved when the uniaxial tensile strain was applied along the b-axis,while a negligible shift was observed when the strain was applied along the *** work reveals the tunable nearinfrared luminescent properties of TiS3 nanoribbons,suggesting their potential applications as near-infrared light sources in photonic integrated circuits.

关键词： titanium trisulfide near-infrared luminescence S-vacancy tunability strain engineering

Retinal ischemia-reperfusion injury and pretreatment with Lycium barbarum glycopeptide

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International Journal of Ophthalmology(English edition) 2024年第9期17卷 1599-1605页

作者： Yan-Xia Wu Shuo Yin Shan-Shan Song xiang Liu Yu-Xuan Deng Xue-Jing lu Eye School of Chengdu University of Traditional Chinese Medicine Chengdu 610075Sichuan ProvinceChina Ineye Hospital of Chengdu University of Traditional Chinese Medicine Chengdu 610084Sichuan ProvinceChina School of Chinese Classics Chengdu University of Traditional Chinese MedicineChengdu 610075Sichuan ProvinceChina Key Laboratory of Sichuan Province Ophthalmopathy Prevention&Cure and Visual Function Protection with Traditional Chinese Medicine Chengdu 610075Sichuan ProvinceChina Retinal Image Technology and Chronic Vascular Disease Prevention&Control and Collaborative Innovation Center Chengdu 610075Sichuan ProvinceChina

AIM:To investigate the antioxidant protective effect of Lycium barbarum glycopeptide(LbGP)pretreatment on retinal ischemia-reperfusion(I/R)injury(RIRI)in ***:RIRI was induced in Sprague Dawley rats through anterior chamber perfusion,and pretreatment involved administering LbGP via gavage for *** 24h of reperfusion,serum alanine aminotransferase(ALT),aspartate aminotransferase(AST),and creatinine(CREA)levels,retinal structure,expression of Caspase-3 and Caspase-8,superoxide dismutase(SOD)activity,and malondialdehyde(MDA)in the retina were ***:The pretreatment with LbGP effectively protected the retina and retinal tissue from edema and inflammation in the ganglion cell layer(GCL)and nerve fiber layer(NFL)of rats subjected to RIRI,as shown by light microscopy and optical coherence tomography(OCT).Serum AST was higher in the model group than in the blank group(P=0.042),but no difference was found in ALT,AST,and CREA across the LbGP groups and model ***-3 expression was higher in the model group than in the blank group(P=0.006),but no difference was found among LbGP groups and the model ***-8 expression was higher in the model group than in the blank group(P=0.000),and lower in the 400 mg/kg LbGP group than in the model group(P=0.016).SOD activity was lower in the model group than in the blank group(P=0.001),and the decrease was slower in the 400 mg/kg LbGP group than in the model group(P=0.003).MDA content was higher in the model group than in the blank group(P=0.001),and lower in the 400 mg/kg LbGP group than in the model group(P=0.016).The pretreatment with LbGP did not result in any observed liver or renal toxicity in the ***:LbGP pretreatment exhibits dosedependent anti-inflammatory,and antioxidative effects by reducing Caspase-8 expression,preventing declines of SOD activity,and decreasing MDA content in the RIRI rat model.

关键词： retinal ischemia-reperfusion Lycium barbarum glycopeptide pretreatment anti-inflammatory antioxidative rat

Brillouin Klein space and half-turn space in three-dimensional acoustic crystals

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Science Bulletin 2024年第13期69卷 2050-2058页

作者： Zhenxiao Zhu Linyun Yang Jien Wu Yan Meng xiang Xi Bei Yan Jingming Chen Jiuyang lu Xueqin Huang Weiyin Deng Ce Shang Perry Ping Shum Yihao Yang Hongsheng Chen Kexin xiang Gui-Geng Liu Zhengyou Liu Zhen Gao State Key Laboratory of Optical Fiber and Cable Manufacture Technology Department of Electronic and Electrical EngineeringSouthern University of Science and TechnologyShenzhen 518055China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China Key Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology Wuhan UniversityWuhan 430072China King Abdullah University of Science and Technology(KAUST) Physical Science and Engineering Division(PSE)Thuwal 23955-6900Saudi Arabia Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationZJU-Hangzhou Global Science and Technology Innovation CenterCollege of Information Science and Electronic EngineeringZJU-UIUC InstituteZhejiang UniversityHangzhou 310027China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore Institute for Advanced Studies Wuhan UniversityWuhan 430072China

The Bloch band theory and Brillouin zone(BZ)that characterize wave-like behaviors in periodic mediums are two cornerstones of contemporary physics,ranging from condensed matter to topological *** theoretical breakthrough revealed that,under the projective symmetry algebra enforced by artificial gauge fields,the usual two-dimensional(2D)BZ(orientable Brillouin two-torus)can be fundamentally modified to a non-orientable Brillouin Klein bottle with radically distinct manifold ***,the physical consequence of artificial gauge fields on the more general three-dimensional(3D)BZ(orientable Brillouin three-torus)was so far ***,we theoretically discovered and experimentally observed that the fundamental domain and topology of the usual 3D BZ can be reduced to a non-orientable Brillouin Klein space or an orientable Brillouin half-turn space in a 3D acoustic crystal with artificial gauge *** experimentally identify peculiar 3D momentum-space non-symmorphic screw rotation and glide reflection symmetries in the measured band ***,we experimentally demonstrate a novel stacked weak Klein bottle insulator featuring a nonzero Z2 topological invariant and self-collimated topological surface states at two opposite surfaces related by a nonlocal twist,radically distinct from all previous 3D topological *** discovery not only fundamentally modifies the fundamental domain and topology of 3D BZ,but also opens the door towards a wealth of previously overlooked momentum-space multidimensional manifold topologies and novel gaugesymmetry-enriched topological physics and robust acoustic wave manipulations beyond the existing paradigms.

关键词： Momentum-space non-symmorphic symmetry Brillouin Klein space and half-turn space Acoustic Klein bottle insulator Self-collimated topological surface states