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arXiv 2024年

作者： Lim, Seongjoon Singh, Sobhit Huang, Fei-Ting Pan, Shangke Wang, Kefeng Kim, Jaewook Kim, Jinwoong Vanderbilt, David Cheong, Sang-Wook Rutgers Center for Emergent Materials Department of Physics and Astronomy PiscatawayNJ08854 United States Department of Mechanical Engineering University of Rochester RochesterNY14627 United States Materials Science Program University of Rochester RochesterNY14627 United States State Key Laboratory Base of Novel Function Materials and Preparation Science School of Material Sciences and Chemical Engineering Ningbo University Zhejiang Ningbo315211 China Department of Physics and Astronomy Rutgers University PiscatawayNJ08854 United States

Electric currents have the intriguing ability to induce magnetization in nonmagnetic crystals with sufficiently low crystallographic symmetry. Some associated phenomena include the non-linear anomalous Hall effect in polar crystals and the nonreciprocal directional dichroism in chiral crystals when magnetic fields are applied. In this work, we demonstrate that the same underlying physics is also manifested in the electronic tunneling process between the surface of a nonmagnetic chiral material and a magnetized scanning probe. In the paramagnetic but chiral metallic compound Co1/3NbS2, the magnetization induced by the tunneling current is shown to become detectable by its coupling to the magnetization of the tip itself. This results in a contrast across different chiral domains, achieving atomic-scale spatial resolution of structural chirality. To support the proposed mechanism, we used first-principles theory to compute the chirality-dependent current-induced magnetization and Berry curvature in the bulk of the material. Our demonstration of this magnetochiral tunneling effect opens up a new avenue for investigating atomic-scale variations in the local crystallographic symmetry and electronic structure across the structural domain boundaries of low-symmetry nonmagnetic crystals. © 2024, CC BY.

关键词： Magnetization

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Effect of pyrolysis temperature on characteristics of tunable magnetic biochar synthesized from watermelon rind and its tetracycline adsorption performance

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Journal of the Taiwan Institute of Chemical Engineers 2024年 160卷

作者： Thairattananon, Phisit Le, Giang T.T. Matsumura, Yukihiko Wu, Kevin C.W. Charinpanitkul, Tawatchai Department of Chemical Engineering Faculty of Engineering Center of Excellence in Particle and Material Processing Technology Chulalongkorn University Bangkok10330 Thailand Institute of Fundamental and Applied Sciences Duy Tan University Ho Chi Minh700000 Viet Nam Faculty of Environmental and Chemical Engineering Duy Tan University Da Nang550000 Viet Nam Mechanical Engineering Program Graduate School of Advanced Science and Engineering Kagamiyama Hiroshima Higashi-Hiroshima739-8527 Japan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taoyuan Taiwan Research Network of NANOTEC-KU on Nanocatalyst and Nanomaterials for Sustainable Energy and Environment Bangkok10900 Thailand

Background: Tetracycline is an emerging contaminant in water reservoirs, causing undesirable influences on human society. The promising usage of magnetic biochar (MBC) derived from watermelon rind has been explored in the adsorption of various contaminants owing to its high specific surface area and separability;however, the temperature-dependent changes of MBC and its sorption ability toward antibiotics have not been widely examined. Method: Tunable MBCs could be synthesized via simple pyrolysis of watermelon rind impregnated with FeCl3 at different temperatures (700–900 °C). The as-synthesized MBCs were characterized using scanning electron microscopy (SEM), an elemental analyzer, N2 adsorption/desorption, Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffractometry (XRD), and vibrating sample magnetometry (VSM). Then Tetracycline, an emerging contaminant in water reservoirs, was employed as the target contaminant, while adsorption kinetics, isotherm, the effect of pH, and reusability were investigated. Significant findings: The tunability of as-synthesized MBCs could be observed by their distinct changes in structural characteristics when varying pyrolysis temperature. MBC synthesized at 900 °C (MBC900) possessed a high-specific surface area (401 m2.g−1) and saturation magnetization (55.29 emu.g−1), resulting in a greater amount of sorption sites. Tetracycline adsorption by MBCs followed a pseudo-second-order kinetic model and fitted well with the Freundlich model. MBC900 is an excellent adsorbent with a maximum adsorption capacity of 77.6 mg.g−1 and could be used for at least five cycles with an insignificant decrease in the adsorption capacity. © 2024 Taiwan Institute of Chemical Engineers

关键词： Adsorption

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Mo-doping heterojunction: interfacial engineering in an efficient electrocatalyst for superior simulated seawater hydrogen evolution

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Chemical science 2024年第3期15卷 1123-1131页

作者： Zuo-Ming He Chun-Xiao Zhang Si-Qi Guo Peng Xu Yuan Ji Si-Wei Luo Xiang Qi Yun-Dan Liu Ning-Yan Cheng Shi-Xue Dou Yun-Xiao Wang Bin-Wei Zhang Hunan Key Laboratory of Micro-Nano Energy Materials and Devices Xiangtan University Xiangtan 411105 PR China liuyd@***. School of Chemistry and Chemical Engineering Chongqing University Chongqing 400044 PR China binwei@***. School of Physics and Optoelectronic Engineering Shandong University of Technology Zibo 255000 PR China. Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information Technology Anhui University Hefei 230601 PR China ningyancheng@***. Institute of Energy Materials Science (IEMS) University of Shanghai For Science and Technology Shanghai 200093 China. Institute for Superconducting and Electronic Materials Australian Institute of Innovative Materials University of Wollongong North Wollongong New South Wales 2500 Australia yunxiao@***. Center of Advanced Electrochemical Energy Institute of Advanced Interdisciplinary Studies Chongqing 400044 PR China.

Exploring economical, efficient, and stable electrocatalysts for the seawater hydrogen evolution reaction (HER) is highly desirable but is challenging. In this study, a Mo cation doped NiSe/MoSe heterostructural electrocatalyst, Mo-NiSe/MoSe, was successfully prepared by simultaneously doping Mo cations into the NiSe lattice (Mo-NiSe) and growing atomic MoSe nanosheets epitaxially at the edge of the Mo-NiSe. Such an Mo-NiSe/MoSe catalyst requires only 110 mV to drive current densities of 10 mA cm in alkaline simulated seawater, and shows almost no obvious degradation after 80 h at 20 mA cm. The experimental results, combined with the density functional theory calculations, reveal that the Mo-NiSe/MoSe heterostructure will generate an interfacial electric field to facilitate the electron transfer, thus reducing the water dissociation barrier. Significantly, the heteroatomic Mo-doping in the NiSe can regulate the local electronic configuration of the Mo-NiSe/MoSe heterostructure catalyst by altering the coordination environment and orbital hybridization, thereby weakening the bonding interaction between the Cl and Se/Mo. This synergistic effect for the Mo-NiSe/MoSe heterostructure will simultaneously enhance the catalytic activity and durability, without poisoning or corrosion of the chloride ions.

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Galvanic replacement reaction for in situ fabrication of litchi-shaped heterogeneous liquid metal-Au nano-composite for radio-photothermal cancer therapy

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Bioactive materials 2021年第3期6卷 602-612页

作者： Zhenhu Guo Jingsong Lu Dan Wang Wensheng Xie Yongjie Chi Jianzhong Xu Nonaka Takuya Junxin Zhang Wanling Xu Fei Gao Hong Wu Lingyun Zhao State Key Laboratory of Powder Metallurgy Powder Metallurgy Research InstituteCentral South UniversityChangshaHunan410083China Key Laboratory of Advanced Materials Ministry of Education of ChinaSchool of Materials Science and EngineeringTsinghua UniversityBeijing100084China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Research Center of Magnetic and Electronic Materials College of Materials Science and EngineeringZhejiang University of TechnologyHangzhouZhejiang310014China Department of Nanoengineering Chemical Engineering Programand Moores Cancer CenterUniversity of California San DiegoLa JollaCA92093United States The Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing100084China School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing100083China Shaanxi University of Chinese Medicine Xi'anShanxi712046China

With tremendous research advances in biomedical application,liquid metals(LM)also offer fantastic chemistry for synthesis of novel ***,as a pioneering trial,litchi-shaped heterogeneous eutectic gallium indium-Au nanoparticles(EGaIn-Au NPs),served as effective radiosensitizer and photothermal agent for radio-photothermal cancer therapy,have been successfully prepared using in situ interfacial galvanic replacement *** enhanced photothermal conversion efficiency and boosted radio-sensitization effect could be achieved with the reduction of Au nanodots onto the eutectic gallium indium(EGaIn)NPs *** importantly,the growth of tumor could be effectively inhibited under the combined radio-photothermal therapy mediated by EGaIn-Au *** by this approach,in situ interfacial galvanic replacement reaction may open a novel strategy to fabricate LM-based nano-composite with advanced multi-functionalities.

关键词： Au nanodots Gallium Galvanic replacement reaction Indium Radio-photothermal therapy

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Eco-conscious flame retardants for enhanced fire resistance in natural fiber reinforced polymers composite: A review bio-based, and industry implications

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Chemosphere 2025年 377卷 144360页

作者： Morsy, Ashraf Kandil, S. Ewais, Hassan A. Abdel-Salam, Ahmed H. Mohamed, Asmaa Materials Science Department Institute of Graduate Studies & Research Alexandria University Alexandria Egypt Petrochemicals Department Faculty of Engineering Pharos University Alexandria Egypt Chemistry Department Faculty of Science King Abdulaziz University P.O. Box 80203 Jeddah21589 Saudi Arabia Chemistry Department Faculty of Science Beni-Suef University Beni-Suef City Egypt Chemistry Department Faculty of Science University of Jeddah P.O. Box 80327 Jeddah21589 Saudi Arabia Chemistry Department Faculty of Science Alexandria University Alexandria Egypt

This review provides a comprehensive analysis of eco-conscious flame retardants for enhancing fire resistance in natural fiber-reinforced polymer composites (NFRPCs). It examines current research methods, highlighting their advantages, limitations, and challenges in testing and evaluation. Traditional flame retardants and their drawbacks are discussed, emphasizing the benefits of NFRPCs and the potential of bio-based alternatives. The paper explores various types of bio-based flame retardants, their mechanisms of action, and their effectiveness in improving fire performance while maintaining material properties. Furthermore, the review delves into recent methodologies, functional groups, and the mechanisms involved in eco-friendly flame retardancy, analyzing their strengths, weaknesses, and emerging trends. Challenges related to compliance with industry standards, regulatory frameworks, and sustainable production practices are also addressed. The potential of utilizing waste biomass for flame retardancy is discussed, offering a pathway towards a circular economy. Additionally, the broader impacts on fire safety and hazard mitigation are explored. The review identifies key research gaps and future directions to advance the field of sustainable flame retardancy. Despite existing challenges, interdisciplinary collaboration is crucial in driving innovation and achieving sustainable fire safety solutions for composite materials. © Elsevier Ltd

关键词： Premixed flames

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Oxygen Non-Stoichiometry and Point Defect Equilibria in (La1/6Pr1/6Nd1/6Gd1/6Ba1/6Sr1/6)MnO3-δ

Oxygen Non-Stoichiometry and Point Defect Equilibria in (La1...

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243rd ECS Meeting

作者： Bishop, Sean R. Zhang, Dawei Liu, Cijie Li, Wei Salinas, Perla A. Smith, Andrew I. Coker, Eric N. De Santiago, Héctor A. Liu, Xingbo McDaniel, Anthony H. Luo, Jian Sandia National Laboratories AlbuquerqueNM87123 United States Program of Materials Science and Engineering University of California La Jolla San DiegoCA92093 United States Department of Mechanical and Aerospace Engineering Benjamin M. Statler College of Engineering and Mineral Resources West Virginia University MorgantownWV26506 United States Sandia National Laboratories LivermoreCA94550 United States Department of NanoEngineering University of California La Jolla San DiegoCA92093 United States

ISBN: (纸本)9781607685395

In this work, the A-site of the common SOFC cathode La0.8Sr0.2MnO3-δ (LSM) is modified with additional lanthanide and alkali elements, resulting in the composition (La1/6Pr1/6Nd1/6Gd1/6Ba1/6Sr1/6)MnO3-δ. We show that the amount of oxygen released during reduction measured by thermo-gravimetric analysis is significantly greater for this "high entropy" perovskite oxide (HEPO) in comparison with La2/3Sr1/3MnO3-δ, the latter having the same amount of total acceptor dopant and with a similar average A-site radius. The origins of enhanced reduction will be discussed. © The Electrochemical Society.

关键词： Thermogravimetric analysis

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Shark Skin Denticles: From Morphological Diversity to Multi-functional Adaptations and Applications

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Advanced Functional materials 2024年第35期34卷

作者： Ghimire, Ashish Dahl, Rikke Beckmann Shen, Sheng-Feng Chen, Po-Yu Dept. of Materials Science and Engineering National Tsing Hua University Hsinchu300044 Taiwan Biodiversity Research Center Academia Sinica Taipei115201 Taiwan Dept. of Life Science National Taiwan Normal University Taipei116059 Taiwan Biodiversity Program Taiwan International Graduate Program Academia Sinica and National Taiwan Normal University Taiwan

The energy crisis of the 1970s sparked growing concern over minimizing fuel consumption in water, land, and air transportation. Researchers fascinated by sharks' effortless swimming abilities investigated shark skin denticles and uncovered functions beyond drag reduction, such as antifouling, protection, and bioluminescence. Over the past five decades, significant progress has been made in comprehending drag reduction and antifouling functions of denticle structures;however, the investigation of other functions remains limited. Recent discoveries of diverse denticle morphologies have ignited a keen interest in obtaining morphogroups that can aid other functional studies. This work integrates advances in antifouling, hydrodynamics, aerodynamics, bioluminescence, and protective functions to provide a holistic understanding of their diverse roles. Additionally, this work also dictates multi-functional adaptations of denticles and contributes to the relatively less-explored but essential aspects, such as protective functions and denticle morphogroups. By examining these functions together, this work aims to uncover potential synergies and interactions, facilitating the development of multifunctional materials inspired by shark skin denticles. © 2024 Wiley-VCH GmbH.

关键词： Hydrodynamics

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Real-time temperature correction for magnetoresistive biosensors integrated with temperature modulator

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Biosensors and Bioelectronics: X 2023年 14卷 100356页

作者： Kim, Songeun Wang, Shan X. Lee, Jung-Rok Division of Mechanical and Biomedical Engineering Ewha Womans University Seoul03760 Korea Republic of Graduate Program in Smart Factory Ewha Womans University Seoul03760 Korea Republic of Department of Materials Science and Engineering Stanford University StanfordCA93405 United States Department of Electrical Engineering Stanford University StanfordCA93405 United States

Magnetoresistance-based biosensors utilize changes in electrical resistance upon varying magnetic fields to measure biological molecules or events involved with magnetic tags. However, electrical resistance fluctuates with temperature. To decouple unwanted temperature-dependent signals from the signal of interest, various methods have been proposed to correct signals from magnetoresistance-based biosensors. Yet, there is still a need for a temperature correction method capable of instantaneously correcting signals from all sensors in an array, as multiple biomarkers need to be detected simultaneously with a group of sensors in a central laboratory or point-of-care setting. Here we report a giant magnetoresistive biosensor system that enables real-time temperature correction for individual sensors using temperature correction coefficients obtained through a temperature sweep generated by an integrated temperature modulator. The algorithm with individual temperature correction coefficients obviously outperformed that using the average temperature correction coefficient. Further, temperature regulation did not eliminate temperature-dependent signals completely. To demonstrate that the method can be used in biomedical applications where large temperature variations are involved, binding kinetics experiments and melting curve analysis were conducted with the temperature correction method. The method successfully removed all temperature-dependent artifacts and thus produced more precise kinetic parameters and melting temperatures of DNA hybrids. © 2023 The Authors

关键词： Kinetics

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An Economical and Efficient Helium Recovery System for Vibration-Sensitive Applications

arXiv

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arXiv 2024年

作者： Yin, Zhiyuan Bi, Liya Shi, Yueqing Li, Shaowei Department of Chemistry and Biochemistry University of California La Jolla San DiegoCA92093-0309 United States Program in Materials Science and Engineering University of California La Jolla San DiegoCA92093-0418 United States

We present the design of a helium liquefaction system tailored to efficiently recover helium vapor from either an individual or a small cluster of vibration-sensitive cryogenic instruments. This design prioritizes a compact footprint, mitigating potential contamination sources such as gas bags and oil-lubricated compressors while maximizing the recovery rate by capturing both the boil-offs during normal operation and refilling process of the bath cryostat. We demonstrated its performance by applying it to a commercial low-temperature scanning probe microscope. It features a > 94% recovery rate and induces negligible vibrational noise to the microscope. Due to its adaptability, affordability, compact size, and suitability for homemade setups, we foresee that our design can be utilized across a wide range of experimental measurements where liquid helium is used as the cryogen. © 2024, CC BY.

关键词： Gas compressors

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Rational Self-Supported Electrode Design with Optimized Ion Migration and Gas Diffusion for Efficient Anion Exchange Membrane Water Electrolyzer

SSRN

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SSRN 2024年

作者： Ning, Minghui Wang, Yu Wu, Libo Zhang, Fanghao Yuan, Chuqing Song, Shaowei Yu, Luo Wang, Dezhi Chen, Shuo Ren, Zhifeng University of Houston HoustonTX77204 United States Materials Science and Engineering Program and TcSUH University of Houston HoustonTX77204 United States Department of Chemistry and TcSUH University of Houston HoustonTX77204 United States

The ion migration and gas diffusion are two of the most critical topics in water electrolysis. Many self-supported electrodes (SSEs) exhibit efficient performance in fundamental research studies due to their excellent gas diffusion. However, such performance is not guaranteed in large-scale electrolyzers due to the extremely large ion migration resistance of these SSEs. Here we find that a commercial SSE (Ni foam) exhibits efficient performance in fundamental research but performs poorly in an anion exchange membrane water electrolyzer (AEMWE). Further investigations reveal that the poor performance of the AEMWE originates from the large ion migration resistance caused by the long OH− migration distance within the SSE. After its design is optimized to minimize the ion migration resistance and enhance gas diffusion efficiency, the AEMWE is found to deliver a current density of 1 A/cm2 at 1.778 V in 1 M KOH at 65 °C. A triple-cell stack is further assembled and found to reach 1 A/cm2 at 5.464 V and to exhibit excellent stability over 216 h in 1 M KOH. © 2024, The Authors. All rights reserved.

关键词： Potassium hydroxide

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