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Imaging the atomic configuration of defects in laves phase MgNi2 using 4D-STEM

Scripta Materialia 2025年 265卷

作者： Li, Jiaxin Zhang, Min Zhang, Chunchen Han, Jiuhui Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials and Low-Carbon Technologies School of Materials Science and Engineering Tianjin University of Technology Tianjin300384 China School of Chemistry and Chemical Engineering Tianjin University of Technology Tianjin 300384 China

Laves phases are promising candidates for high-temperature structural materials, with their mechanical properties strongly influenced by defect structures. In this study, the atomic configurations of defects in the Laves phase MgNi2 were systematically investigated using four-dimensional scanning transmission electron microscopy (4D-STEM). Combined multislice simulations and experimental results validated the robustness of Center-of-Mass (CoM) imaging based on 4D-STEM for simultaneously resolving both heavy and light elements in MgNi2 under varying sample and instrument parameters. We conducted a detailed analysis of planar faults and dislocations in MgNi2 using 4D-STEM. Our findings revealed that the hexagonal planar faults, formed via relative sliding of adjacent regions, are characterized by nickel deficiency. Additionally, the atomic structure of dislocations in regions containing non-basal stacking faults suggests a synchroshear deformation mechanism. These results demonstrate the effectiveness of 4D-STEM in probing complex defect structures in intermetallic materials, offering critical insights into their deformation behavior. © 2025 Acta Materialia Inc.

关键词： Crystal atomic structure

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Enhanced subacute ischemic stroke treatment via multistage drug delivery system design for combination therapy

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science China Chemistry 2025年

作者： Xihan Xu Juan-Juan Li Jiamin Li Hui-Yan Zhang Yilin Qi Bing-Sen Shi Tianqi Li Shan-Shan Su Weitao Zhao Chang Chen Zhongying Gong Huiyu Liu Ke-Rang Wang Dong-Sheng Guo Xue Xue State Key Laboratory of Medicinal Chemical Biology College of Pharmacy Nankai University College of Chemistry State Key Laboratory of Elemento-Organic Chemistry Key Laboratory of Functional Polymer Materials (Ministry of Education) Frontiers Science Center for New Organic Matter Collaborative Innovation Center of Chemical Science and EngineeringNankai University College of Chemistry and Materials Science State Key Laboratory of New Pharmaceutical Preparations and Excipients Key Laboratory of Medicinal Chemistry and Molecular Diagnosis (Ministry of Education) Key Laboratory of Chemical Biology of Hebei Province Hebei Research Center of the Basic Discipline of Synthetic Chemistry Hebei University Department of Neurology Tianjin First Central Hospital School of Medicine Nankai University Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic Composites Beijing Laboratory of Biomedical Materials Bionanomaterials & Translational Engineering Laboratory Beijing Key Laboratory of BioprocessBeijing University of Chemical Technology

The management of acute ischemic stroke remains challenging due to its abrupt onset and the narrow treatment window,resulting in high rates of disability and *** therapy for neuroprotection and neurorepair strategies provided new hopes for subacute stroke *** we designed a multistage nanodelivery system that matches the unique microenvironment of the subacute phase of stroke,which utilizes calixarene as a building block to effectively load the neuroprotective drug *** calixarene is designed with glycosidic linkages targeting the glucose transporter 1 (GLUT1)on the blood-brain barrier (BBB) and azo bonds that are responsive to hypoxic ***,the decomposed calixarene molecules themselves possess intrinsic bio-activation to modulate inflammatory responses,achieving a multistage therapeutic approach that transitions from targeting to release and finally to *** approach combines anti-inflammation and neuroprotection,providing a multi-level treatment *** system was validated in a rat model of permanent middle cerebral artery occlusion (pMCAO),demonstrating that intravenous administration of the nanodelivery system repairs brain damage and improves motor function 24 h post-pMCAO *** work offers a precise and integrative strategy for stroke patients missing the acute therapy window to improve functional recovery and enhance the effect of comprehensive treatment.

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Broadened and enhanced blue emission of interstitial Eu2+ in α-cristobalite via Al3+ codoping for high color rendering white LEDs

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Ceramics International 2025年

作者： Xia, Zhiwei Wang, Yuhan Yang, Rujun Xu, Mengdi Lin, Cunjian Li, Zhongyuan Lv, Ying Chi, Xiaopeng You, Shihai Research Institute of Frontier Science Southwest Jiaotong University Chengdu610031 China Zijin School of Geology and Mining Fuzhou University Fuzhou350108 China Nanchang Key Laboratory of Photoelectric Conversion and Energy Storage Materials College of Science Nanchang Institute of Technology Nanchang330099 China College of Materials Xiamen University Xiamen361005 China Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Normal University Wuhu241000 China of Advanced Science and Technology Japan Advanced Institute of Science and Technology Nomi923-1292 Japan

The interstitial site engineering that purposely creates interstitial luminescent centers in suitable hosts has become an intriguing strategy in designing novel inorganic phosphors. However, effectively tuning the photoluminescence of interstitial activators remains tough challenging at this stage. Here, we demonstrate the effective modulation of interstitial luminescence in inorganic phosphor. In detail, the blue emission band (λem = 446 nm) of interstitial Eu2+ doped α-cristobalite (SiO2:Eu2+) is largely enhanced and broadened via a partial, aliovalent substitution of Si4+ by Al3+. After introducing Al3+ ions into SiO2 lattice, the full width at half maximum of the blue emission band increase from 59 to 76 nm with a triple growth in quantum efficiency (10.82% → 35.56%). Moreover, the thermal stability improves significantly with a high emission retention of 60% at 325 °C (SiO2:0.06Al3+,0.005Eu2+), far higher than that of the parent SiO2:0.005Eu2+ (30%). Encapsulating blue-emitting SiO2:Al3+,Eu2+ along with two commercial green and red phosphors on an ultraviolet LED chip (λem = 375 nm), a white LED device with high color rendering index (Ra > 90) was successful fabricated, showing the great potential of this phosphor for achieving high-quality white LED lighting. This study not only provides a promising bule emitter but also sheds light on modulating interstitial luminescence properties in inorganic phosphors. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Phosphors

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Multi-dimensional hierarchical structure enable sheet-like network Li plating with Efficient space utilization for advanced lithium metal anodes

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Applied Surface science 2025年 704卷

作者： Wang, Ning Wang, Yang Shi, Chunsheng Li, Yue Zhang, Rui Wang, Xin'gai Zhang, Haichang Ding, Fei State Key Laboratory of Intelligent Power Distribution Equipment and System Hebei University of Technology Tianjin300130 China School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin300350 China

The lithium (Li) metal as the most competitive candidate anode for Li-S batteries has been plagued by significant volumetric fluctuations and uncontrolled dendritic Li growth during repeated plating/stripping processes, leading to deteriorated cycling stability and severe safety hazards. To address these challenges, we designed and fabricated a three-dimensional (3D) carbon–carbon nanotubes-Ni hierarchical architecture (3DC-CNTs-Ni) as a multifunctional host for lithium metal anodes (LMAs). The 3DC-CNTs-Ni framework enables guided Li nucleation and deposition through the engineered "tip discharge effect" induced by nickel particles located at carbon nanotube termini, resulting in uniform dense two-dimensional (2D) sheet-like growth of Li instead of irregular dendrite growth. Further, the sheet-like Li forms an interconnected Li network to enable uniform filling of the entire electrode with zero expansion, including the inside of the porous hierarchical architecture. Crucially, the linear correlation between double-layer capacitance (Cs) and electrochemically active surface area (ECSA) obtained from electrochemical impedance spectroscopy (EIS) reveals that the 2D sheet-like growth pattern mechanism. Thus, the Coulombic efficiency (CE) of the 3DC-CNTs-Ni skeleton for the Li metal anode could remain at 98.5 % for over 500 cycles. Consequently, the soft package of Li-S battery using the Li@3DC-CNTs-Ni anode delivers a capacity of 750 mAh g−1 after 50 cycles at 0.2C. This work provides a scalable strategy for developing high-performance LMAs with dendrite suppression and volumetric stability. © 2025 Elsevier B.V.

关键词： Health hazards

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A self-assembled composited cathode coated with dual-exsolved core–shell FeNi@FeOx nanoparticles as efficient CO2 reduction electrocatalysts

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Journal of Colloid and Interface science 2025年 693卷 137564页

作者： Shao, Qi Han, Xu Li, Kaixin Guan, Wanbing Ling, Yihan Lv, Zhe School of Physics Harbin Institute of Technology Heilongjiang Harbin150001 China Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor Components Heilongjiang Harbin150001 China School of Materials Science and Physics China University of Mining and Technology Xuzhou221116 China Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Zhejiang Ningbo315201 China

Solid oxide electrolytic cells (SOECs) enable efficient electrochemical reduction of CO2 into CO, providing a sustainable solution for greenhouse gas mitigation. Nevertheless, the scarcity of stable and highly active cathode materials for the real application of SOECs is a serious challenge. Herein, a novel self-assembled composed cathode of Ni co-doped (Pr0.5Sr0.5)0.95Fe0.9Nb0.1O3-δ-Gd0.1Ce0.9O2-δ (PSFNNb-GDC) is proposed as an efficient CO2 electrolysis. The NiFe/FeOx nanoparticles with a core–shell structure are uniformly deposited onto the surface of the PSFNNb-GDC cathode. La0.8Sr0.2Ga0.8Mg0.2O3-δ (LSGM)-based single cell with NiFe/FeOx@PSFNNb-GDC cathode achieve excellent performance (1.33 A cm−2 at 850 °C@1.6 V) and stability (800 °C@1.2 V) in long-term operation. The performance enhancement original from increased surface oxygen vacancies and in situ formed FeNi@FeOx core–shell nanoparticles. This research highlights the potential of rational structural design of SOECs cathode materials in advancing the field of CO2 utilization. © 2025

关键词： Shells (structures)

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Antibacterial and bioactive composite hydrogels from carrageenan-PVA-chitosan incorporated ZiF-8@GO for wound healing: in vitro and in vivo evaluations

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Journal of Biomaterials science, Polymer Edition 2025年 1-22页

作者： Yasin, Tooba Zafar, Muhammad Shahzad Albishi, Hayat M. Eid, Thamir M. Siddiqi, Humaira Masood Khan, Muhammad Umar Aslam Polymer Chemistry laboratory Department of Chemistry Quaid-i-Azam University Islamabad Pakistan SKKU Advanced Institute of Nanotechnology (SAINT) Sungkyunkwan University Suwon South Korea Department of Chemical Polymer and Composite Engineering University of Engineering & Technology Faisalabad Campus Lahore 38000 Pakistan Department of Biochemistry Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Department of Mechanical and Industrial Engineering Qatar University Doha Qatar Biomedical Research Center Qatar University Doha Qatar

Hydrogels are promising dressings for wound healing as they resemble the native extracellular matrix that provides a microenvironment for skin wound healing. Herein, we have developed composite hydrogels by incorporating ZiF-8@GO into the polymeric mixture of chitosan (CS), polyvinyl alcohol (PVA), and carrageenan (CG). These were analyzed using FTIR, XRD, SEM-EDX, and DSC to study their structural, surface morphology, elemental analysis, and thermal stability. The physicochemical properties were studied in different media under various pH at 37 °C. The degradation was performed in phosphate buffer saline solution at 37 °C under 7.4 pH, and the wettability was conducted to study the hydrophilicity and hydrophobicity. All the composite hydrogels are hemocompatible and exhibit excellent anti-bacterial activities against Gram-positive and Gram-negative bacteria. We have performed in-vitro biological assays using fibroblast (3t3) cell lines, and increasing ZiF-8@GO increased cell viability and proliferation. The wound contraction was also performed using an in-vivo wound healing model using SD-rat, and hydrogel (CPC-Z@GO-3) was found to heal the wound quickly without any scar formation. These hydrogels have exhibited excellent physicochemical characteristics and biological properties, which would be promising composite polymeric materials for wound repair and regeneration. © 2025 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Antibacterials biocompatible composite hydrogel graphene oxide hemocompatible wound healing zeolitic imidazolate framework-8

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Secrets of high thermal emission of transition metal disilicides TMSi_(2)(TM=Ta,Mo)

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Journal of Materials science & technology 2021年第30期89卷 114-121页

作者： Huimin Xiang Fuzhi Dai Yanchun Zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China

TMSi_(2)(TM=Ta,Mo)are extensively used as thermal emissivity agents in high emission coatings due to their well-known"high"emissivity in infrared ***,there is a paucity of the high temperature(HT)emissivity property of these two ***,room temperature(RT)spectrometer measurements have demonstrated that the emittance in infrared range of two silicides was considerably ***,providing critical HT data and satisfactory elucidation on the emission incompatibility of TMSi_(2)is eagerly *** this contribution,combining first principles calculations and Drude model,the reflectance spectra of TMSi_(2)were predicted at both RT and *** with spectrometer measurements,the intrinsic emittance of silicides was relatively low in the entire investigated *** explain the incompatible emission behavior,two simplified models including the majority of high emissivity coating,SiO_(2),were ***,with SiO_(2)considered in simulations,no matter covered on the surface or blended in the composites,the emittance of the TMSi_(2)enhanced *** theoretical results demonstrate the non-negligible significance of oxides on the high temperature performance of silicides and provide the guidelines for improving the emission performance of silicides and searching for potential high emissivity agents.

关键词： Disilicide Optical properties Thermal emission First-principles calculations Drude model

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Gate-tuned antiferromagnetic MnBi4Te7: A candidate for high-temperature high-Chern-number insulator at zero magnetic field

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Physical Review B 2025年第11期111卷 115420-115420页

作者： Hengning Wang Ding Li Yan Feng Tao Qin Yingze Jia Hongwei Zhang Chuandi Pan Yan Wang Wei Ning Anhui Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field Laboratory HFIPS Chinese Academy of Sciences Hefei Anhui 230031 China University of Science and Technology of China Hefei 230026 China Department of Materials Science & Engineering Hefei National Research Center for Physical Sciences at the Microscale CAS Key Lab of Materials for Energy Conversion Anhui Laboratory of Advanced Photon Science and Technology University of Science and Technology of China Hefei China School of Physics and Optoelectronics Engineering Anhui University Hefei Anhui Province 230601 People's Republic of China Information Materials and Intelligent Sensing Laboratory of Anhui Province Anhui Key Laboratory of Magnetic Functional Materials and Devices Institutes of Physical Science and Information Technology Anhui University Hefei 230601 China Department of Physics Shaanxi University of Science and Technology Xi'an 710021 China

The quantum anomalous Hall insulator is characterized by a quantized Hall resistance plateau of h/(Ce2) with C being the Chern number. Previously, high-Chern-number insulators with C≥2 that intrinsically suppress the energy dissipation in quantized electrical transport have been realized in few-layer MnBi2Te4 nanoflakes under moderate magnetic fields or in Cr-doped topological insulators at extremely low temperatures. It has nevertheless proven elusive to achieve a high-temperature high-Chern-number insulator at zero magnetic field. Here, we demonstrate that the magnetic state in MnBi4Te7 nanoflakes can be consecutively tuned from an antiferromagnetic (AFM) state to an AFM-ferromagnetic (FM) coexistence state, and finally to a robust ferromagnetic (FM) state with large coercivities at temperatures up to 3 K via a protonic gate. This AFM-FM phase transition is well captured by density functional theory simulations that the FM state develops in MnBi4Te7 under hole doping. Notably, we find that the Chern number of FM MnBi4Te7 can be largely tuned not merely by the Zeeman field but also by the sample thickness. Our work demonstrates that gate-tuned MnBi4Te7 nanoflakes hold high potentials for realizing a high-temperature high-Chern-number insulator at zero magnetic field and promising applications in the field of low-energy electronics.

关键词： Ferromagnetism

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Significant photothermoelectric effect of topological semimetals at infrared bands

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Physical Review Applied 2025年第3期23卷 034077-034077页

作者： Cheng-Hao Yin Hong-Tao Jiang Yang-Yang Lv Shu-Hua Yao Jian Zhou Y. B. Chen Yan-Feng Chen National Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 China Department of Physics Nanjing University Nanjing 210093 China Jiangsu Key Laboratory of Artificial Functional Materials & Department of Materials Science and Engineering Nanjing University Nanjing 210093 China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan Institute of Technology Wuhan 430205 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

We theoretically explore the photothermoelectric effect (PTE) of topological semimetals using the static two-temperature model. The interaction between the Dirac or Weyl fermions and electromagnetic waves is described by the dielectric constant in the model Hamilton of topological semimetals. Numerical calculations predict a significant PTE in the conventional plasmon mode with infrared bands of both the Dirac and Weyl semimetals. In addition to the PTE with a plasmon mode, the Weyl semimetals exhibit an enormous PTE at the frequencies of the two unconventional modes (helicon waves) in the infrared region. The helicon-wave modes originate from the resonant coupling between left- and right-circularly polarized electromagnetic waves and the helical motion of Weyl electron under an effective magnetic field induced by the Berry curvature. The frequencies of the helicon-wave modes depend on the carrier concentration, the Fermi velocity, and the distance between the positive and negative Weyl points in the Weyl semimetals, as well as the transport lifetime of the Weyl fermion. Using real parameters for the topological semimetals, we propose ideal materials for detecting the specific infrared bands of electromagnetic waves. This work strongly suggests that topological semimetals are promising for detecting electromagnetic waves in the infrared region, taking advantage of their significant PTE.

关键词： Helicons

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Room-temperature field-tunable radiofrequency rectification in epitaxial SrIrO3 films

arXiv

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arXiv 2025年

作者： Zhou, Liang Du, Zongzheng Wang, Jinhua H. Chen, Pingbo Ye, Bicong Feng, Tao Yang, Jiahao Xiao, Zehao H. Yang, Meng Li, Junxue X. Zhang, Wenqing Lu, Hai-Zhou He, Hongtao Department of Physics Southern University of Science and Technology Shenzhen518055 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen518055 China International Quantum Academy Shenzhen518048 China Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory for Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen518055 China Guangdong Provincial Key Laboratory of Advanced Thermoelectric Materials and Device Physics Southern University of Science and Technology Shenzhen518055 China

Although significant advancements have been made in wireless technologies and portable devices, it remains a challenge for high-frequency and nanowatt-level radiofrequency rectification. In this work, we report a pronounced radiofrequency rectification up to 37 GHz in nominally centrosymmetric SrIrO3 epitaxial films, with the minimum detectable power as low as ~300 nanowatts. Strikingly, the SrIrO3 rectifier is highly field-tunable and exhibits a strong in-plane field anisotropy, thus showing a unique advantage in broad-band radiofrequency rectification. The rectification effect can persist up to at least 360 K and shows a sensitive temperature dependence including a sign inversion. By a systematic study of the nonlinear transport properties of SrIrO3, it’s further revealed that the radiofrequency rectification originates from the nonlinear Hall effect with the dominant contribution from field-induced Berry curvature dipole. Our work demonstrates the superior performance of the field-tunable SrIrO3 rectifiers, unleashing the great application potential of centrosymmetric materials in harvesting and detecting ambient electromagnetic energy. © 2025, CC BY.

关键词： Electromagnetic waves

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