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Structure and superconducting properties of Ru_(1-x)Mo_(x)(x=0.1-0.9)alloys

Chinese physics B 2024年第4期33卷 173-179页

作者：付阳龚春生涂志俊田尚杰王守国雷和畅 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation Renmin University of ChinaBeijing 100872China Anhui Key Laboratory of Magnetic Functional Materials and Devices School of Materials Science and EngineeringAnhui UniversityHefei 230601China

We report the detailed crystal structures and physical properties of Ru_(1-x)Mo_(x)alloys in the solid solution range of x=*** characterizations indicate that the crystal structure changes from the hcp-Mg-type,toβ-CrFe-type,and then *** measurements of physical properties show that the Ru_(1-x)Mo_(x)samples with x≥0.2are superconductors and the superconducting transition temperature T_c as a function of Mo content exhibits a dome-like behavior.

关键词： superconductivity alloy crystal structures Ru_(1-x)Mo_(x)

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Advancements in nanocarbon-based catalysts for enhanced fuel cell performance: a comprehensive review

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International Journal of Energy and Water Resources 2025年第2期9卷 1005-1027页

作者： Agrawal, P. Ebrahim, S. Ponnamma, D. Materials Science and Technology Program Department of Mathematics Statistics and Physics College of Arts and Sciences Qatar University Doha 2713 Qatar Department of Nanoscience and Technology University of Calicut Kerala Calicut India Center for Advanced Materials Qatar University Doha 2713 Qatar

Fuel cells hold great promise as a clean energy technology, yet challenges such as material compatibility, manufacturing costs, and durability issues, particularly with noble metal-based electrocatalysts like platinum (Pt), hinder their widespread adoption. This review explores strategies to enhance fuel cell performance while minimizing costs, focusing on developing efficient and cost-effective catalysts supported by nanocarbon materials, such as carbon nanotubes, graphene, carbon films, and their composites. The investigation delves into how these catalysts supports improve activity and stability, leading to superior fuel cell performance characterized by higher current density and enhanced durability compared to conventional Pt/C catalysts, with a specific focus on proton-exchange membrane fuel cells. Key topics covered include the role of nanocarbon in fuel cells, various nanocarbon-based catalyst supports, Pt-containing alloys, non-Pt catalysts, and nanocarbon composites for electrolyte membranes and corrosion protection. Notable findings include the importance of heteroatom doping in enhancing reactivity, the effectiveness of organic–inorganic composite proton exchange membranes in improving proton conductivity, and the potential of amorphous carbon film coatings and conductive polymer-nanocarbon composites in enhancing corrosion resistance. These advancements underscore the potential of nanocarbon-based catalysts and coatings in ensuring the reliability and longevity of fuel cell components, thus contributing to the widespread commercialization of fuel cell technology. © The Author(s) 2024.

关键词： Carbon corrosion: Nanocarbon materials Catalyst support Current density Durability Electrocatalysts

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Liquid crystal-templated chiral nanomaterials: from chiral plasmonics to circularly polarized luminescence

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Light(science & Applications) 2022年第8期11卷 1753-1781页

作者： Xuan Zhang Yiyi Xu Cristian Valenzuela Xinfang Zhang Ling Wang Wei Feng Quan Li School of Materials Science and Engineering Tianjin University300350TianjinChina Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University211189NanjingChina Advanced Materials and Liquid Crystal Institute and Chemical Physics Interdisciplinary Program Kent State UniversityKentOH44242USA

Chiral nanomaterials with intrinsic chirality or spatial asymmetry at the nanoscale are currently in the limelight of both fundamental research and diverse important technological applications due to their unprecedented physicochemical characteristics such as intense light-matter interactions, enhanced circular dichroism, and strong circularly polarized luminescence. Herein, we provide a comprehensive overview of the state-of-the-art advances in liquid crystal-templated chiral nanomaterials. The chiroptical properties of chiral nanomaterials are touched, and their fundamental design principles and bottom-up synthesis strategies are discussed. Different chiral functional nanomaterials based on liquid-crystalline soft templates, including chiral plasmonic nanomaterials and chiral luminescent nanomaterials, are systematically introduced, and their underlying mechanisms, properties, and potential applications are emphasized. This review concludes with a perspective on the emerging applications, challenges, and future opportunities of such fascinating chiral nanomaterials. This review can not only deepen our understanding of the fundamentals of soft-matter chirality, but also shine light on the development of advanced chiral functional nanomaterials toward their versatile applications in optics, biology, catalysis, electronics, and beyond.

关键词： chiral circular polarized

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Polyvinyl chloride-reduced graphene oxide based chemiresistive sensor for sensitive detection of ammonia

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Journal of materials science: materials in Electronics 2024年第3期35卷 1-18页

作者： Gaikwad, Sumita S. More, Mayuri S. Khune, Abhaysinh S. Mohammed, Hamed Y. Tsai, Meng-Lin Hianik, Tibor Shirsat, Mahendra D. RUSA Centre for Advanced Sensor Technology Department of Physics Dr Babasaheb Ambedkar Marathwada University MS Aurangabad431 004 India Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Nuclear Physics and Biophysics Faculty of Mathematics Physics and Informatics Comenius University Bratislava842 48 Slovakia

In this study, we present the innovative development of sensitive chemiresistive sensor utilizing a composite material composed of polyvinyl chloride (PVC) and reduced graphene oxide (rGO) for the highly responsive detection of ammonia (NH3) at ambient conditions. Graphene oxide (GO) was meticulously synthesized employing an enhanced version of Hummer’s method, and subsequently, rGO was prepared via thermal reduction from GO. The PVC/rGO composite was synthesized using a precise chemical pathway. The synthesized material was comprehensively characterized using advanced techniques including X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), UV–visible spectroscopy, Raman spectroscopy, atomic force microscopy (AFM), and I–V measurements, unveiling its structural, spectroscopic, morphological, and electrical attributes. The chemiresistive sensor was fabricated through the meticulous drop-casting of PVC/rGO composite onto an economical Cu interdigitated electrode (IDE) pattern. Remarkably, this PVC/rGO-based chemiresistive sensor exhibited superior performance in detecting corrosive NH3. The sensor demonstrated an exceptional response time of 46 s and a recovery time of 88 s, coupled with an impressively low detection limit of 1 ppm, surpassing the Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL). Notably, this sensor displayed a remarkable selectivity towards NH3 at ambient conditions, outperforming its response to other gases. Furthermore, the sensor exhibited outstanding reproducibility, repeatability, linearity, sensitivity, and stability in its response to NH3. This research showcases a groundbreaking advancement in the field of gas sensing technology, offering a highly sensitive and selective chemiresistive sensor for NH3 detection at room temperature (RT). The synergistic combination of PVC and rGO in the composite material, along with the precise fabrication techniques employed, has resulted in a sensor with u

关键词： Ammonia

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Moiré Exchange Effect in Twisted WSe2/WS2 Heterobilayer

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Physical Review Letters 2024年第8期133卷 086501页

作者： Jiayi Zhu Huiyuan Zheng Xi Wang Heonjoon Park Chengxin Xiao Yinong Zhang Takashi Taniguchi Kenji Watanabe Jiaqiang Yan Daniel R. Gamelin Wang Yao Xiaodong Xu Department of Physics Institute of Materials Science and Engineering Research Center for Materials Nanoarchitectonics Research Center for Electronic and Optical Materials Materials Science and Technology Division Department of Chemistry HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong China Department of Materials Science and Engineering

Moiré superlattices of layered transition metal dichalcogenides are proven to host periodic electron crystals due to strong correlation effects. These electron crystals can also be intertwined with intricate magnetic phenomena. In this Letter, we present our findings on the moiré exchange effect, resulting from the modulation of local magnetic moments by electron crystals within well-aligned WSe2/WS2 heterobilayers. Employing polarization-resolved magneto-optical spectroscopy, we unveil a high-energy excitonic resonance near one hole per moiré unit cell (v=−1), which possesses a giant g factor several times greater than the already very large g factor of the WSe2 A exciton in this heterostructure. Supported by continuum model calculations, these high-energy states are found to be dark excitons brightened through Umklapp scattering from the moiré mini-Brillouin zone. When the carriers form a Mott insulating state near v=−1, the Coulomb exchange between doped carriers and excitons forms an effective magnetic field with moiré periodicity. This moiré exchange effect gives rise to the observed giant g factor for the excitonic Umklapp state.

关键词： Charge order Excitons Magnetic interactions Transition metal dichalcogenides Optical spectroscopy

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An interpretable deep learning approach for designing nanoporous silicon nitride membranes with tunable mechanical properties

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npj Computational materials 2023年第1期9卷 1524-1533页

作者： Ali KShargh Niaz Abdolrahim Department of Mechanical Engineering University of RochesterRochesterNY 14627USA Materials Science program University of RochesterRochesterNY 14627USA Laboratory for Laser Energetics University of RochesterRochesterNY 14627USA

The high permeability and strong selectivity of nanoporous silicon nitride(NPN)membranes make them attractive in a broad range of *** their growing use,the strength of NPN membranes needs to be improved for further extending their biomedical *** this work,we implement a deep learning framework to design NPN membranes with improved or prescribed strength *** examine the predictions of our framework using physics-based *** results confirm that the proposed framework is not only able to predict the strength of NPN membranes with a wide range of microstructures,but also can design NPN membranes with prescribed or improved *** simulations further demonstrate that the microstructural heterogeneity that our framework suggests for the optimized design,lowers the stress concentration around the pores and leads to the strength improvement of NPN membranes as compared to conventional membranes with homogenous microstructures.

关键词： tunable prescribed strength

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Diverse nanomaterials synthesized by laser ablation of pure metals in liquids

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science China(physics,Mechanics & Astronomy) 2022年第7期65卷 48-82页

作者： DongShi Zhang ZhuGuo Li ChangHao Liang Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China Department of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

Diverse nanomaterials, in the forms of carbides, sulfides, oxides, metals, hydroxides, etc., have been synthesized by laser ablation in liquids(LAL) with metal targets as the dominant educts. Many advantages of LAL technique itself and its products have been revealed since 1983 when the first report about LAL was released. Different from traditional wet-chemical synthesis,one unique feature of LAL is its resultant extreme high-temperature and high-pressure local environment for the nucleation and growth of nanomaterials, despite being performed at room temperature. This extreme condition can induce the atomization and ionization of the target materials and liquid molecules to incur different chemical reactions. The laser, liquid, liquid additive, and target can significantly alter the local environment in a broad range. Thus, different phases and shapes of nanomaterials are producible even from the same target. Through directly comparing the products of LAL of 13 kinds of chosen representative metals synthesized under different conditions, this review presents and discusses current understandings, challenging issues, and perspectives related to the diversity of LAL-products, which is willing to promote a deeper investigation and discussion on a clear clarification of the chemical reactions and particle nucleation/growth processes.

关键词： nanomaterial synthesis laser ablation in liquid phase manipulation morphology diversity

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Crafting chirality in three dimensions via a novel fabrication technique for bound states in the continuum metasurfaces

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Light(science & Applications) 2024年第3期13卷 390-392页

作者： Zaid Haddadin Anna My Nguyen Lisa V.Poulikakos Department of Electrical&Computer Engineering University of California San DiegoLa JollaCAUSA Department of Mechanical&Aerospace Engineering University of California San DiegoLa JollaCAUSA Program of Materials Science&Engineering University of California San DiegoLa JollaCAUSA

An additional deposition step was added to a multi-step electron beam lithographic fabrication process to unlock the height dimension as an accessible parameter for resonators comprising unit cells of quasi-bound stat... 详细信息

关键词： dimensions dimension intrinsic

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X-ray and molecular dynamics study of the temperature-dependent structure of molten NaF-ZrF4

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Physical Review materials 2024年第7期8卷 075402-075402页

作者： Anubhav Wadehra Rajni Chahal Shubhojit Banerjee Alexander Levy Yifan Zhang Haoxuan Yan Daniel Olds Yu Zhong Uday Pal Stephen Lam Karl Ludwig Division of Materials Science and Engineering Chemical Science Division Department of Chemical Engineering Department of Mechanical Engineering Department of Mechanical and Materials Engineering National Synchrotron Light Source II Department of Physics

The local atomic structure of NaF-ZrF4 (53–47 mol%) molten system and its evolution with temperature are examined with x-ray scattering measurements which are then used to validate the quality of ab initio and neural network-based molecular dynamics (NNMD) calculations in the temperature range 515−700∘C. The machine-learning enhanced NNMD calculations offer improved efficiency while maintaining accuracy at higher distances compared to ab initio calculations. Looking at the evolution of the pair distribution function with increasing temperature, a fundamental change in the liquid structure within the selected temperature range, accompanied by a slight decrease in overall correlation is revealed. NNMD calculations indicate the coexistence of three different fluorozirconate complexes: [ZrF6]2−, [ZrF7]3−, and [ZrF8]4−, with a shift in the dominant coordination state from the 7-coordinated Zr cation toward a 6-coordinated cation with increasing temperature. The study also highlights the metastability of different local coordination structures, with frequent interconversions between the 6- and 7-coordinate states. Analysis of the Zr-F-Zr angular distribution function reveals the presence of both “edge-sharing” and “corner-sharing” fluorozirconate complexes with specific bond angles and distances in accord with previous studies, while the next-nearest-neighbor cation-cation correlations demonstrate a clear preference for unlike cations as nearest-neighbor pairs, emphasizing nonrandom arrangement. These findings contribute to a comprehensive understanding of the complex local structure of the molten salt, providing insights into temperature-dependent preferences and correlations within the molten system.

关键词： Atomic & molecular structure Ionic fluids Liquids Ab initio molecular dynamics Machine learning X-ray pair-distribution function analysis X-ray scattering

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Phthalocyanine self-assembled nanoparticles for type I photodynamic antibacterial therapy

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Chinese Chemical Letters 2024年第12期35卷 511-516页

作者： Wei Su Xiaoyan Luo Peiyuan Li Ying Zhang Chenxiang Lin Kang Wang Jianzhuang Jiang Guangxi Key Laboratory of Natural Polymer Chemistry and Physics Nanning Normal UniversityNanning 530000China College of Pharmacy Guangxi University of Chinese MedicineNanning 530000China 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

Most photodynamic therapies(PDT)rely on reactive oxygen species(ROS)produced by type II mecha ***,since the production of type I ROS is not limited by oxygen content,making it more favorable for antimicrobial phototherapy in complex ***,we report a substituen cationization design strategy that not only improves the hydrophilicity of the prepared phthalocyanine molecule,but also promotes the electron transfer process in the photosensitizer,resulting in the strong type I photodynamic effect of the phthalocyanine self-assembled photosensitizer to efficiently generate O_(2)^(·-)under both normal and hypoxic *** in combination with its excellent bacteria recogni tion capability derived from the cationic part on its surface and intrinsic photothermal therapy effect o the phthalocyanine macrocycle endows the phthalocyanine self-assembled photosensitizer with excellen phototherapeutic antimicrobial properties in preclinical models,effectively promoting the wound healing *** work provides a promising strategy for designing efficient multi-mode photosensitizers.

关键词： Phthalocyanine Nanoparticles Photodynamic therapy Type I reactive oxygen species Antibacterial therapy

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