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Effects of MXenes (Ti3C2Tx) deposition by drop casting on the fretting wear of structural concrete

Wear 2025年 570卷

作者： Silva, Cristiane Arpino Gonçalves, Margarete R.F. Rosenkranz, Andreas Hammes, Gisele Costa, Henara Lillian Universidade Federal de Pelotas Materials Science and Engineering Graduate Program Rua Gomes Carneiro 1 Porto RS Pelotas Brazil University of Chile Department of Chemical Engineering Biotechnology and Materials Avenida Beauchef 851 Santiago Chile Universidade Federal de Santa Catarina LabMat Rua Delfino Conti s/n. Bloco B Trindade SC Florianópolis Brazil Universidade Federal do Rio Grande School of Engineering Av. Itália km 8 Bairro Carreiros RS Rio Grande Brazil

In civil engineering, concrete is the most widely used material due to the availability of its components. Research on tribology of semi-rigid structural systems is important in civil engineering, as the initially rigid contact between concrete and metallic elements can generate micromovement, resulting in wear due to fretting and possible cracks. Recently, a new family of 2D metal carbide and nitride nanosheets called MXenes has stood out in tribological applications due to their layered structure, which provides self-lubricating and reinforcing properties, but they are costly and difficult to produce in large scale, making their use in civil engineering challenging, despite encouraging results from the literature. To overcome this, the present work proposed surface deposition of MXenes by drop-casting (involving very small amounts of Mxenes) to control fretting wear between concrete and steel. One and five applications were deposited from a dispersion at a concentration of approximately 0.4 mg/mL of MXenes in isopropanol. Fretting tests were carried out on concrete (with and without MXenes deposition) against steel counterbodies for a total stroke of 200 μm under different speeds (0.2 and 2 mm/s) and times (5 and 30 min). The results showed that the friction coefficients obtained in the fretting tests did not present a statistically significant difference when using Mxenes either as a reinforcement in the concrete or deposited by drop casting. The wear rates obtained from the fretting tests demonstrated that, for the lower speed, no significant difference could be confirmed for the modified concretes in either the 5 min or the 30 min tests. On the other hand, in the condition of speed = 2 mm/s and time = 5 min, the wear rate for one application of MXenes by dropcasting was lower than the reference. With a higher speed and 30-min test, a greater effect on the wear rate occurred, which may be the result of tribochemical effects in the contact. It is clear that, in t

关键词： Tribology

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Fourfold Anisotropic Magnetoresistance of L10 FePt Due to Relaxation Time Anisotropy

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Physical Review Letters 2022年第24期128卷 247202-247202页

作者： Y. Dai Y. W. Zhao L. Ma M. Tang X. P. Qiu Y. Liu Z. Yuan S. M. Zhou Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and Pohl Institute of Solid State Physics and School of Physics Science and Engineering Tongji University Shanghai 200092 China Center for Advanced Quantum Studies and Department of Physics Beijing Normal University Beijing 100875 China

Experimental measurements show that the angular dependence of the anisotropic magnetoresistance (AMR) in L10 ordered FePt epitaxial films on the current orientation and magnetization direction is a superposition of the corresponding dependences of twofold and fourfold symmetries. The twofold AMR exhibits a strong dependence on the current orientation, whereas the fourfold term only depends on the magnetization direction in the crystal and is independent of the current orientation. First-principles calculations reveal that the fourfold AMR arises from the relaxation time anisotropy due to the variation of the density of states near the Fermi energy under rotation of the magnetization. This relaxation time anisotropy is a universal property in ferromagnetic metals and determines other anisotropic physical properties that are observable in experiment.

关键词： Anisotropic magnetoresistance Spin-orbit coupling Ferromagnets First-principles calculations Resistivity measurements

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Biomedical data and AI

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science China Life sciences 2025年第5期68卷 1536-1540页

作者： Hao Xu Shibo Zhou Zefeng Zhu Vincenzo Vitelli Liangyi Chen Ziwei Dai Ning Yang Luhua Lai Shengyong Yang Sergey Ovchinnikov Zhuoran Qiao Sirui Liu Chen Song Jianfeng Pei Han Wen Jianfeng Feng Yaoyao Zhang Zhengwei Xie Yang-Yu Liu Zhiyuan Li Fulai Jin Hao Li Mohammad Lotfollahi Xuegong Zhang Ge Yang Shihua Zhang Ge Gao Pulin Li Qi Liu Jing-Dong Jackie Han Peking-Tsinghua Center for Life Sciences (CLS) Academy for Advanced Interdisciplinary StudiesPeking University Center for Quantitative Biology (CQB) Academy for Advanced Interdisciplinary StudiesPeking University Peking University-Tsinghua University-National Institute of Biological Sciences Joint Graduate Program Academy for Advanced Interdisciplinary StudiesPeking University Department of Physics University of Chicago School of Life Sciences Southern University of Science and Technology Peking University Chengdu Academy for Advanced Interdisciplinary Biotechnologies College of Chemistry and Molecular Engineering Peking University Department of Biotherapy Cancer Center and State Key Laboratory of BiotherapyWest China HospitalSichuan University Department of Biology Massachusetts Institute of Technology Lambic Therapeutics Inc. Changping Laboratory Al for Science Institute Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence Fudan University Department of Obstetrics and Gynecology West China Second University HospitalSichuan University Peking University International Cancer Institute and Peking University-Yunnan Baiyao International Medical Institute and State Key Laboratory of Natural and Biomimetic Drugs Department of Molecular and Cellular PharmacologySchool of Pharmaceutical SciencesPeking University Health Science CenterPeking University Channing Division of Network Medicine Department of MedicineBrigham and Women's Hospital and Harvard Medical School Center for Artificial Intelligence and Modeling the Carl R.Woese Institute for Genomic BiologyUniversity of Illinois Urbana-Champaign Department of Genetics and Genome Sciences School of Medicine and Department of Computer and Data Sciences and Department of Population and Quantitative Health SciencesCase Western Reserve University Department of Biochemistry and Biophysics University of California Sanger Institute Department of Automation Tsinghua University State Key Laboratory of Multimodal Artificial Intelligence Systems I

The development of artificial intelligence(AI) and the mining of biomedical data complement each other. From the direct use of computer vision results to analyze medical images for disease screening, to now integrating biological knowledge into models and even accelerating the development of new AI based on biological discoveries, the boundaries of both are constantly expanding, and their connections are becoming closer.

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Leveraging Impurities in Recycled Lead Anodes for Sodium-Ion Batteries

SSRN

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SSRN 2022年

作者： Eaves-Rathert, Janna Moyer-Vanderburgh, Kathleen Wolfe, Kody Zohair, Murtaza Pint, Cary L. Department of Mechanical Engineering Vanderbilt University NashvilleTN37235 United States Interdisciplinary Materials Science Program Vanderbilt University NashvilleTN37235 United States Department of Mechanical Engineering Iowa State University AmesIA50011 United States

In recent years, the supply chain shock due to the rapid rise of the lithium-ion battery has made alternative chemistries, such as sodium-ion batteries, appealing for low-cost and large-scale energy storage. Meanwhile, the falling popularity of lead acid batteries has potential consequences for the price of scrap lead and its penetration into waste streams. In this work, we upcycle lead alloys from a used lead acid battery into a next-generation sodium-ion system for ultra-low-cost rechargeable batteries. Through evaluation of sodium storage capacity and rate capability, we study the rich interplay of Pb-Sb-Sn microstructure and properties which can be controlled through simple heat treatment of unrefined powders to reach a maximum specific capacity of 522 mAh.g-1. When cycled in the presence of glyme-based electrolytes, the ternary alloys nanostructure to facilitate an optimal balance of power and cycle life. These findings that demonstrate how defects can be leveraged to improve performance bring exciting implications for reducing cost and mitigating volume expansion in other high-value commodities, like tin or silicon. © 2022, The Authors. All rights reserved.

关键词： Lead acid batteries

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Controllable directional excitation and emission of nanoemitters by a subwavelength mie antenna

Controllable directional excitation and emission of nanoemit...

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2020 Frontiers in Optics Conference, FiO 2020

作者： Fang, Jie Wang, Mingsong Yao, Kan Zheng, Yuebing Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

ISBN: (纸本)9781943580804

We derive a universal multipolar model for dipole-sphere hybrids, introduce single subwavelength silicon nanospheres at visible wavelengths with facile size control, and demonstrate controllable directional excitation and emission of nanoemitters (e.g. WS2, MoS2) for on-demand emission property modulations. © OSA 2020 © 2020 The Author(s)

关键词： Nanospheres

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Fe3O4@UiO-66-NH2 based on magnetic solid phase extraction for determination of organic UV filters in environmental water samples

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Chemosphere 2023年第1期341卷

作者： Hejji, Lamia Azzouz, Abdelmonaim Pérez-Villarejo, Luis Castro, Eulogio Souhail, Badredine Rodríguez-Castellón, Enrique Department of Chemical Environmental And Materials Engineering University of Jaén Campus Las Lagunillas Jaén23071 Spain Center for Advanced Studies in Earth Science Energy and Environment University of Jaén Campus Las Lagunillas Jaén23071 Spain Department of Chemistry Faculty of Science University of Abdelmalek Essaadi B.P. 2121 M'Hannech II Tétouan93002 Morocco Department of Inorganic Chemistry Faculty of Science University of Malaga Málaga29071 Spain

In this work, a nanocomposite structured magnetic metal–organic framework named as Fe3O4@UiO-66-NH2 was prepared via a simple hydrothermal approach. The as-mentioned nanocomposite was characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and the Brunauer–Emmett–Teller (BET) techniques. Using the Fe3O4@UiO-66-NH2 as a nanosorbent, an easy and highly effective approach was developed to preconcentrate nine organic UV filters before gas chromatography–mass spectrometry (GC–MS) analysis. Different conditions influencing the extraction efficiency encompassing the sorbent amount, nature and volume of desorption solvent, desorption time, pH of the sample, and extraction time, were examined. Under the optimal experimental parameters, the Fe3O4@UiO-66-NH2-based magnetic solid phase extraction and GC–MS (MSPE–GC–MS) demonstrated linearity in the range of 0.03–1500 ng/L (R2 ≥ 0.9974) and the reproducibility, expressed as RSD, was ≤7.5%. The limits of detection ranged between 0.01 and 0.07 ng/L and limits of quantification were in the range of 0.03–0.4 ng/L. Finally, the suggested approach was satisfactorily utilized to determine nine organic UV filters in different water samples (analytical recoveries between 86.5% and 104.2%). © 2023 Elsevier Ltd

关键词： Magnetite

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Characterizations of Second-order Nonlinear Optical Susceptibility for ϵ-phase Gallium Oxide

Characterizations of Second-order Nonlinear Optical Suscepti...

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2022 Compound Semiconductor Week, CSW 2022

作者： Zhou, Jingan Zhao, Xuan Xu, Rui Fu, Kai Li, Tao Xu, Mingfei He, Ziyi Robinson, Jacob T. Zhu, Hanyu Zhang, Xiaodong Zhao, Yuji Rice University Department of Electrical and Computer Engineering HoustonTX77005 United States Rice University Smalley-Curl Institute Applied Physics Graduate Program HoustonTX77005 United States Rice University Department of Materials Science and NanoEngineering HoustonTX77005 United States Arizona State University School of Electrical Computer and Energy Engineering TempeAZ85287 United States Suzhou Institute of Nano-tech and Nano-bionics CAS Key Laboratory of Nanodevices and Applications Suzhou215123 China

ISBN: (数字)9781665453400

ISBN: (纸本)9781665453400

In this work, we report the second-order nonlinear optical susceptibility χ(2) for epsilon phase Gallium Oxide (ϵ-Ga2O3) thin film on sapphire. ϵ-Ga2O3 exhibits hexagonal P63mc space group symmetry, which is a non-centrosymmetric structure with non-zero second order susceptibility. By focusing a pulsed laser beam on to a polished ϵ-Ga2O3 thin film, we collected the generated second harmonic photons with an ultra-sensitive femtowatt photodetector, obtaining effective second-order nonlinear optical susceptibility of χ(2) = 4.89×10-3 pm/V at wavelength of 800 nm. Two different measurement systems collecting reflected and transmitted photons were applied separately to make the result more convincing. The wavelength dependence from 790 nm to 900 nm and polarization dependence from TM mode to TE mode were measured as well. These results will be helpful for the design and fabrication of Ga2O3 based integrated photonics platform in the infrared-visible spectral range. © 2022 IEEE.

关键词： Gallium compounds

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Study of Structural, Optical, Microstructural, Magnetic and Dielectric Samarium Substituted Srm Hexaferrite Using Sonochemical Method

SSRN

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SSRN 2023年

作者： Hashim, Mohammad Salih, Shameran J. Ismail, Mukhlis M. Ahmed, Ateeq Meena, Sher Singh Jotania, Rajshree B. Kumar, Shalendra Ravinder, D. Kumar, Ravi Batoo, Khalid Mujasam Shirsath, Sagar E. Department of Applied Physics Aligarh Muslim University Aligarh202002 India Department of Chemistry Faculty of Science and Health Koya University Koy 45 Kurdistan Region – F.R. Koya Iraq Department of Pharmaceutical Basic Sciences Faculty of Pharmacy Tishk International University KRG Erbil Iraq Department of Applied Science University of Technology Iraq Department of Materials Science and Engineering Chosun University Gwangju61452 Korea Republic of Solid State Physics Division Bhabha Atomic Research Centre Mumbai400 085 India Department of Physics Electronics and Space Science University School of Sciences Gujrat University Ahmedabad380 009 India Department of Physics School of Engineering University of Petroleum & Energy Studies Dehradun248007 India Deapartment of Physics Osmania University India Department of Material Science and Engineering National Institute of Technology HP Hamirpur177005 India Collage of Science King Saud University P.O. Box-2455 Riyadh11451 Saudi Arabia School of Materials Science and Engineering University of New South Wales SydneyNSW2052 Australia

In this study, the role of sonochemical treatment followed by a combustion process adopted for the synthesis of Sm-doped M-type Sr-hexaferrite (SrM) SrSmxFe12-xO19. X-ray diffraction and Fourier transformation infrared (FT-IR) analysis validated the single phase SrM hexaferrite. The force constant increased on both sides (tetra and octa) with the increased of samarium content, which has been extracted from the results of the FT-IR spectra. The calculated band gap is conducted using the UV-Vis spectrum where it was 2.5 eV for x = 0.01. As the samarium content increased, the band gap gradually increased to 2.85 and 3.0 eV for x = 0.02 and 0.03, correspondingly. The sonochemical-produced Sm-doped M-type Sr hexaferrite nanoparticles are also examined using field emission scanning electron microscopy, vibrating sample magnetometry and LCR meter. Magnetic properties of the prepared Sm-doped Sr hexaferrite nanoparticles show that a single magnetic domain is formed. The Sm-doped of the SrFe12O19 compound exhibits a low dielectric constant (Ε′) whose values reached 20 at low frequencies, while it increased with increasing temperature and reached 100 when the Sm content was 0.01. The temperature and frequency-dependent dielectric constant confirmed the contributions of different polarization mechanisms. © 2023, The Authors. All rights reserved.

关键词： Saturation magnetization

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Dynamic twisting and imaging of moiré crystals

arXiv

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arXiv 2023年

作者： Zhang, Qixuan Senaha, Trevor Zhang, Ruolun Wu, Chen Lyu, Lingyuan Cao, Leonard W. Tresback, Jason Dai, Andrew Watanabe, Kenji Taniguchi, Takashi Allen, Monica T. Program in Material Science and Engineering University of California San DiegoCA92093 United States Department of Physics University of California San DiegoCA92093 United States Center for Nanoscale Systems Harvard University CambridgeMA02138 United States National Institute for Materials Science Namiki 1-1 Ibaraki Tsukuba305-0044 Japan

The electronic band structure is an intrinsic property of solid-state materials that is intimately connected to the crystalline arrangement of atoms. Moiré crystals, which emerge in twisted stacks of atomic layers, feature a band structure that can be continuously tuned by changing the twist angle between adjacent layers [1–4]. This class of artificial materials blends the discrete nature of the moiré superlattice with intrinsic symmetries of the constituent materials, providing a versatile platform for investigation of correlated phenomena whose origins are rooted in the geometry of the superlattice, from insulating states at "magic angles" [5–8] to flat bands in quasicrystals [9]. Here we present a route to mechanically tune the twist angle of individual atomic layers with a precision of a fraction of a degree inside a scanning probe microscope, which enables continuous control of the electronic band structure in situ. Using nanostructured rotor devices, we achieve the collective rotation of a single layer of atoms with minimal deformation of the crystalline lattice. In twisted bilayer graphene, we demonstrate nanoscale control of the moiré superlattice periodicity via external rotations, as revealed using piezoresponse force microscopy [10]. We also extend this methodology to create twistable boron nitride devices, which could enable dynamic control of the domain structure of moiré ferroelectrics [11–13]. This approach provides a route for real-time manipulation of moiré materials, allowing for systematic exploration of the phase diagrams at multiple twist angles in a single device. © 2023, CC BY.

关键词： Atoms

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Reduction of interface defects in gate-recessed GaN HEMTs by neutral beam etching

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materials Today Advances 2024年 23卷

作者： Yu, Chia Hao Chiang, Wei Hsiang Chen, Yi-Ho Samukawa, Seiji Wuu, Dong Sing Chung, Chin-Han Hsiao, Ching-Lien Horng, Ray Hua Institute of Electronics National Yang Ming Chiao Tung University Department of Materials Science and Engineering National Chung Hsing University Graduate Degree Program of College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Institute of Comunications Engineering National Yang Ming Chiao Tung University Department of Applied Materials and Optoelectronic Engineering National Chi Nan University International College of Semiconductor Technology National Yang Ming Chiao Tung University Thin Film Physics Division Department of Physics Chemistry and Biology (IFM) Linköping University

This study investigates and compares the impact of different etching techniques on the fabrication of GaN high electron mobility transistors (HEMTs) between the inductively coupled plasma reactive ion etching (ICP-RIE) and the neutral beam etching (NBE) for the gate recess. By conducting direct current analysis, it was found that devices manufactured using the NBE exhibited superior electrical performance as compared with those produced using the ICP-RIE. These enhanced electrical characteristics include a transconductance of up to 100.4 mS/mm, a threshold voltage (V_th) of −2.3 V, an on/off current ratio of 1.1 × 10⁹, a subthreshold swing (S.S.) of 99.63 mV/dec, and a remarkably low gate leakage current. Additionally, we noted varying degrees of hysteresis in the I–V characteristics were related to process disparities possibly leading to interface defects. Multi-frequency capacitance-voltage (C–V) measurements were used to identify the interface defects at the oxide/AlGaN interface of the gate. The results revealed that devices fabricated using the NBE exhibited a lower interface defect density as compared with those fabricated using the ICP-RIE, thereby elucidating the reduced hysteresis observed in the I–V characteristics. These findings indicated the significant advantages of the NBE process in the fabrication of GaN HEMTs. © 2024 The Authors

关键词： GaN HEMTs Gate recess Interface defects Multi-frequency C–V Neutral beam etching

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