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SSRN 2023年

作者： Akhtaruzzaman, Md. Mottakin, M. Selvanathan, Vidhya Razali, Syaza Amira Islam, Md. Ariful Almohamadi, Hamad Alharthi, Nabeel H. Yoshimura, Satoru Selangor Bangi43600 Malaysia Dept. of Applied Chemistry and Chemical Engineering Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj8100 Bangladesh Department of Chemical Engineering Faculty of Engineering Islamic University of Madinah Madinah41411 Saudi Arabia Department of Mechanical Engineering Faculty of Engineering Islamic University of Madinah Madinah41411 Saudi Arabia Mechanical Engineering Department College of Engineering King Saud University Riyadh11421 Saudi Arabia Research Center of Advanced Materials for Breakthrough Technology Graduate School of Engineering Science Akita University 1-1 Tegatagakuen-machi Akita City010-8502 Japan Graduate School of Pure and Applied Sciences University of Tsukuba Ibaraki Tsukuba305-8573 Japan

Development of seawater splitting is essential for the sustainable hydrogen energy production via electrocatalysis. In this study, a facile electrodeposition technique is adopted to design a copper sulfide/cobalt sulfide biphasic composition on nickel foam as bifunctional electrocatalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In saline water, bi-phasic CoSx/CuSx@NF catalyst provides the minimal overpotential of 230 mV at 10 mA cm−2 and 390 mV at 100 mA cm−2 for OER. The electrode exhibits the Tafel slope of 133.4 mV dec−1. CoSx/CuSx@NF catalyst also provides the minimal overpotential of 113 mV at 10 mA cm−2 for HER. From FESEM analysis, it was deduced that the interconnected nanosheet and nanoflower structure in CoSx/CuSx@NF provides high surface area and lowered interfacial resistance for improving OER and HER activity. The catalyst shows excellent multifunctional activity in urea oxidation reaction (UOR). The electrodes showed good stability in alkaline, chloride solutions by retaining its activity up to 24 hours for OER and 60 hrs for HER. This study demonstrates a highly stable, reproducible, cost-effective electrodeposited biphasic catalyst for OER, HER, and UOR. © 2023, The Authors. All rights reserved.

关键词： Electrocatalysts

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Structure of AlN on Si (111) Deposited with Metal Organic Vapor Phase Epitaxy

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MRS Internet Journal of Nitride Semiconductor Research 2020年第1期4卷 322-326页

作者： Rehder, Eric Zhou, M. Zhang, L. Perkins, N. R. Babcock, S. E. Kuech, T. F. Materials Science Program University of Wisconsin -Madison Madison USA Dept. of Materials Science University of Wisconsin -Madison Madison USA Dept. of Chemical Engineering University of Wisconsin -Madison Madison USA

The surface morphology and structure of AlN deposited by metal organic vapor phase epitaxy (MOVPE) on Si (111) at growth temperatures ranging from 825 to 1175°C was investigated. Transmission electron microscopy (TEM), reflection high energy electron diffraction (RHEED), atomic force microscopy (AFM), and secondary ion mass spectrometry (SIMS) techniques were used to study the resulting film structure. Growth at high temperatures but less than ∼1100°C, resulted in a wire texture with some degree of in-plane alignment with (0001)AlN/ /(111)Si, < 10 $$\bar 1$$ 0>AlN//< $$\bar 2$$ 11>Si, and 11 $$\bar 2$$ 0>AlN//< $$\bar 1$$ 10>Si. Deposition at temperatures greater than 1100°C results in single crystal films consisting of domains 60 nm across with an aspect ratio near unity. Growth below1100°C leads to degraded crystal quality with the grains developing random rotational misalignments around the AlN [0001] axis. Growth at lower temperatures produces islands elongated along the [11 $$\bar 2$$ 0] direction. At the growth temperature of 825°C, the aspect ratio of the islands increased to 3 and a width of 25 nm. Cross-sectional TEM reveals that these islands are faceted due to slow growth on the {1 $$\bar 1$$ 01}planes.

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High-speed Raman spectroscopic diagnosis guaranteeing accuracy by reinforcement learning

High-speed Raman spectroscopic diagnosis guaranteeing accura...

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Biomedical Imaging and Sensing Conference 2023

作者： Kubo, Toshiki Tabata, Koji Kawagoe, Hiroyuki Taylor, James N. Mochizuki, Kentaro Clement, Jean-Emmanuel Kumamoto, Yasuaki Harada, Yoshinori Nakamura, Atsuyoshi Fujita, Katsumasa Komatsuzaki, Tamiki Dept. of Applied Physics Osaka Univ. 2-1 Yamadaoka Suita Osaka565-0871 Japan Research Center of Mathematics for Social Creativity Research Institute for Electronic Science Hokkaido Univ. Kita 20 Nishi 10 Kita-ku Sapporo Hokkaido001–0020 Japan Hokkaido University Kita 21 Nishi 10 Kita-ku Sapporo Hokkaido001–0021 Japan Department of Pathology and Cell Regulation GraduateSchool of Medical Science Kyoto Prefectural University of Medicine Kajii-cho Kawaramachi-Hirokoji Kamigyo Kyoto Kyoto602–8566 Japan Institute for Open and Transdisciplinary Research Initiatives Osaka University Yamadaoka Suita Osaka565–087 Japan Graduate Schoolof Information Science and Technology Hokkaido University Kita 14 Nishi 9 Kita-ku Sapporo Hokkaido060–0814 Japan Advanced Photonics and Biosensing Open Innovation Laboratory AIST-Osaka University Yamadaoka Suita Osaka565–0871 Japan Graduate School of Chemical Sciences and Engineering Materials Chemistry and Engineering Course Hokkaido University Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido060–0812 Japan

ISBN: (纸本)9781510663435

We developed spontaneous Raman microscopy using Bandit algorithm to realize fast diagnosis of the existence of anomalies or not with guaranteeing accuracy. The algorithm evaluates obtained Raman spectra during measurement to judge if the diagnosis is completed with ensuring an allowance error rate that users decided and also to generate optimal illumination patterns for the next irradiation which are optimized to accelerate the detection of anomaly. We present our simulation and experimental studies to show that our system can accelerate more than a few tens times faster than line-scanning Raman microscopy which requires full scanning over all pixels. © 2023 SPIE.

关键词： Reinforcement learning

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Review: Topology of solitons and singular defects in chiral liquid crystals

arXiv

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arXiv 2021年

作者： Wu, Jin-Sheng Smalyukh, Ivan I. Department of Physics and Chemical Physics Program University of Colorado BoulderCO80309 United States Dept. of Electrical Computer and Energy Engineering and Materials Science and Engineering Program University of Colorado BoulderCO80309 United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

Widely known for their uses in displays and electro-optics, liquid crystals are more than just technological marvels. They vividly reveal the topology and structure of various solitonic and singular field configurations, often markedly resembling the ones arising in many field theories and in the areas ranging from particle physics to optics, hard condensed matter and cosmology. In this review, we focus on chiral nematic liquid crystals to show how these experimentally highly accessible systems provide valuable insights into the structure and behavior of fractional, full, and multi-integer two-dimensional skyrmions, dislocations and both abelian and non-abelian defect lines, as well as various three-dimensionally localized, often knotted structures that include hopfions, heliknotons, torons and twistions. We provide comparisons of some of these field configurations with their topological counterparts in chiral magnets, discussing close analogies between these two condensed matter systems. Copyright © 2021, The Authors. All rights reserved.

关键词： Topology

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Enhancing mechanical properties of graphene / epoxy nanocomposites using few-layer graphene produced by liquid phase exfoliation 18

Enhancing mechanical properties of graphene / epoxy nanocomp...

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18th European Conference on Composite materials, ECCM 2018

作者： Oba, K. Arao, Y. Hosoi, A. Kawada, H. Dept. of Applied Mechanics Graduate School of Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Dept. of Chemical Science and Engineering Tokyo Institute of Technology 2-12-1 O-okayama Meguro Tokyo152-8550 Japan Dept. of Applied Mechanics and Aerospace Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Kagami Memorial Research Institute for Materials Science and Technology Waseda University 2-8-16 Nishi-Waseda Shinjuku Tokyo169-0051 Japan

ISBN: (纸本)9781510896932

In this study, few-layer graphenes (FLGs) were produced by new liquid phase exfoliation (LPE), exfoliation of graphite with weak acid salts. A high concentration dispersion of FLGs in low-boiling point solvents is successfully carried out, achieved by binding molecules with a dispersing function. And then graphene/epoxy nanocomposites were fabricated and tensile properties were evaluated in order to understand the effect of FLGs introduced into the resin. Graphene/epoxy nanocomposite showed improved mechanical properties. Tensile strength and fracture strain were increased by 11.5% and 55.6% compared with as-received one's. Especially, the improvement of fracture strain was outstanding, which indicated that adding FLGs had a positive impact on suppressing effect on crack propagation and improving fracture toughness of matrix resin. These beneficial results were derived from crack trapping by uniformly dispersed FLGs. © CCM 2020 - 18th European Conference on Composite materials. All rights reserved.

关键词： Graphene

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Correlation Analysis with Experimental Procedures and Peak Structures in Xps Spectral Round-Robin Tests on Mno Powder Sample

SSRN

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SSRN 2022年

作者： Murakami, Ryo Harada, Yoshitomo Sonobayashi, Yutaka Oji, Hiroshi Makino, Hisao Tanaka, Hiromi Taguchi, Hideyuki Sakamoto, Takanori Morita, Haruka Wakamori, Akihiko Kibe, Naoko Nishida, Shinsuke Nagata, Kenji Shinotsuka, Hiroshi Shouno, Hayaru Yoshikawa, Hideki The University of Electro-Communications Graduate School of Informatics and Engineering Chofu182-8585 Japan National Institute for Materials Science Research and Services Division of Materials Data and Integrated System Ibaraki Tsukuba305-0044 Japan Kyoto University Department of Materials Science and Engineering Kyoto606-8501 Japan Nagoya University Synchrotron radiation Research center Nagoya464-8603 Japan Kochi University of Technology School of Systems Engineering Japan National Institute of Technology Yonago College Department of Electrical and Computer Engineering Japan Nihon Parkerizing Co. Ltd Central Research Laboratories Kanagawa 254-0012 Japan JX Nippon Mining & Metals Corporation Technology Development Center Japan Melco Semiconductor Engineering Corporation Chemical Analysis & Evaluation Engineering Dept. Fukuoka Japan Kobelco Welding TechnoSolutions Co. Technical Solution Dept. Ltd Kanagawa 251-8551 Japan Furukawa Electric Co. Ltd Analysis Technology Center Sustainable Technology Laboratorie Kanagawa 220-0073 Japan

Spectral measurements provide valuable information on the electronic states and crystal structures of materials. In particular, X-ray photoelectron spectroscopy (XPS) can facilitate analysis of the chemical bond state of material surfaces. In the analysis of XPS spectra, the spectrum to be measured is typically compared to a reference spectrum measured on a known single-phase sample. Therefore, establishing a reference spectral database is imperative. In this study, round-robin tests of XPS spectra are performed with the aim of obtaining recommended XPS reference spectra and experimental procedures, including preprocessing. Determining the variations in peak structures between instrument- and sample-derived spectral shapes, and quantitatively discussing them in round-robin tests of XPS spectra are challenging. Therefore, an analysis method that automatically determines the above mentioned variations and extracts the samplederived common spectral structures is developed. This study presents a new approach to the quantitative analysis of round-robin tests of XPS spectra. The required common © 2022, The Authors. All rights reserved.

关键词： X ray photoelectron spectroscopy

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Thermophysical properties of graphene-based nanofluids

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International Journal of Thermofluids 2021年 10卷

作者： Elsaid, Khaled Abdelkareem, Mohammad Ali Maghrabie, Hussein M. Sayed, Enas Taha Wilberforce, Tabbi Baroutaji, Ahmad Olabi, A.G. Chemical Engineering Program Texas A& M University College StationTX United States Dept. of Sustainable and Renewable Energy Engineering University of Sharjah P.O. Box 27272 Sharjah United Arab Emirates Center for Advanced Materials Research University of Sharjah PO Box 27272 Sharjah United Arab Emirates Chemical Engineering Department Minia University Elminia Egypt Department of Mechanical Engineering Faculty of Engineering South Valley University Qena83521 Egypt Mechanical Engineering and Design Aston University School of Engineering and Applied Science Aston Triangle BirminghamB4 7ET United Kingdom School of Engineering Faculty of Science and Engineering University of Wolverhampton Telford United Kingdom

Heat transfer operations are very common in the process industry to transfer a huge amount of thermal energy, i.e., heat, from one fluid to another for different purposes. Many fluids are used as heat transfer fluid (HTF), in which water is the most common HTF due to its high specific heat, availability, and affordability. However, conventional HTFs, including water, have a lower thermal conductivity, which is the most critical thermophysical property, hence decreased heat transfer efficiency. The addition of solid particles of highly thermally conductive material, specifically at nano-size, i.e., nanoparticles NPs, result in nanofluid NF, which has evolved over the last two decades as efficient HTF and have been investigated in a wide range of applications. Among NPs, graphene (Gr) based materials have shown very high potential as NF due to the very high thermal conductivity up to 5,000 W/m.K, hence higher thermal conductivity NF. This work aims to thoroughly discuss the thermophysical properties of Gr-based NFs, including thermal conductivity, heat capacity, density, and viscosity. The discussion focus on the thermophysical properties as it is the ultimate determinator of the heat transfer characteristics of the HTF, such as the convective and the overall heat transfer coefficient as well as the heat transfer capacity of the NF. The discussion expands to the relative enhancement in such thermophysical properties reaching up to a 40% increase in thermal conductivity, as the most critical thermophysical property. The discussion shows that Gr-based NF has a much higher thermal conductivity relative to widely studied metal oxide NF and at much lower content, and lower density and viscosity increase, which is critical for determining the pumping power requirements. Critical challenges facing the application of Gr-based NFs such as cost, stability, increased density and viscosity, and environmental impacts are thoroughly discussed with mitigation recommendations given.

关键词： Graphene

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Corrigendum to "Variations of oxidative potential of PM2.5 in a medium-sized residential city in South Korea measured using three different chemical assays" [920 (2024) 171053]

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The science of the total environment 2024年 926卷 172075页

作者： Pyung-Rae Kim Sung-Won Park Young-Ji Han Myong-Hwa Lee Thomas M Holsen Cheol-Heon Jeong Greg Evans Agriculture and Life Sciences Research Institute Kangwon National University Chuncheon Gangwon-do 24341 Republic of Korea. Dept. of Interdisciplinary Graduate Program in Environmental and Biomedical Convergence Kangwon National University Chuncheon Gangwon-do 24341 Republic of Korea. Dept. of Environmental Science Kangwon National University Chuncheon Gangwon-do 24341 Republic of Korea Gangwon particle pollution research and management center Kangwon National University Chuncheon Gangwon-do 24341 Republic of Korea. Electronic address: youngji@kangwon.ac.kr. Gangwon particle pollution research and management center Kangwon National University Chuncheon Gangwon-do 24341 Republic of Korea Dept. of Environmental Engineering Kangwon National University Chuncheon Gangwon-do 24341 Republic of Korea. Dept. of Civil and Environmental Engineering Clarkson University Potsdam NY 13699 USA. Dept. of Chemical Engineering and Applied Chemistry University of Toronto Toronto Ontario MS5 3E5 Canada.

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Thermal valorisation extracts of selected agro-waste for human pathogen antibacterial NiO nanoparticles synthesis

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materials Today: Proceedings 2021年 36卷 559-565页

作者： L.C. Razanamahandry A.C. Nwanya A.K.H. Bashir C.M. Furqan J. Sackey A.E. Ameh G. Kavitha E. Manikandan S.K.O. Ntwampe E. Fosso-Kankeu F. Ezema M. Maaza UNESCO-UNISA Africa Chair in Nanoscience’s/Nanotechnology Laboratories (U2AC2N) College of Graduate Studies University of South Africa (UNISA) Muckleneuk Ridge P O Box 392 Pretoria South Africa Nanosciences African NETWORK (NANOAFNET) Materials Research Department (MRD) iThemba LABS-National Research Foundation (NRF) 1 Old Faure Road 7129 P O Box722 Somerset West Western Cape Province South Africa Department of Physics and Astronomy University of Nigeria Nsukka Enugu State Nigeria Preston Institute of Nano Science and Technology (PINSAT) Preston University Kohat Islamabad Campus Pakistan Enivronmental and Nano Science Research Group Department of Chemistry University of the Western Cape Bellville 7535 Cape Town South Africa Post Graduate (P.G.) & Research Dept. of Physics A M Jain College Meenembakkam-600114 University of Madras Chennai India Department of Physics TUCAS Campus Thennangur-604408 Thiruvalluvar University Vellore India Bioresource Engineering Research Group (BioERG) Cape Peninsula University of Technology P.O. Box 652 Cape Town 8000 South Africa Department of Chemical Engineering Faculty of Engineering and the Built EnvironmentCape Peninsula University of Technology PO Box 1906 Bellville 7535 Cape Town South Africa Water Pollution Monitoring and Remediation Initiatives Research Group School of Chemical and Minerals Engineering North-West University Private Bag X1290 Potchefstroom 2520 South Africa

Waste management stays a challenge in developing countries. This research reports on the valorisation of agro-waste for the synthesis of nickel oxide nanoparticles (NiO NPs), useful as antibacterial agents to assure the sustainable use of renewable waste resources for human health protection. Agro-waste extracts from Persea americana seed, Zea mays silk and Eucalyptus globulus leaves were used as chelating agents in combination with nickel nitrate to synthesis NiO NPs. Optical, physical and chemical characteristics of synthesised NiO NPs were analysed by Ultraviolet spectroscopy studies (UV–VIS analysis), X-ray powder diffraction (XRD) and Scanning Electron Microscopy (SEM); Fourier Transform Infrared analysis (FTIR) and Energy Dispersive X-Ray Spectroscopy (EDS), respectively. Antibacterial activity of each synthesised NiO-NPs was determined by cell culture in nutrient agar using well diffusion method. The UV–VIS results showed the formation of NiO NPs at wavelength range 300 – 400 nm. The XRD patterns demonstrated the crystalline form of the NiO NPs with a lattice face-centered cubic with average size of 14, 18 and 19 nm for NiO NPs from Persea americana seed, Zea mays silk and Eucalyptus globulus leaves, respectively. SEM images revealed the spherical, pleomorphism and nanosheet surface shape of the synthesised NiO NPs. chemical elements K, P, Mg, Na, C and O were detected by EDS analysis as forming part of the elemental composition of the NiO NPs synthesised. chemical bending between O–H, C–H, C–C and C-N was observed using FTIR. Furthermore, antibacterial studies showed the efficacy of all the NiO NPs synthesised against pathogen microbial growth with the largest inhibition zone (IZ) of 26 mm for the NiO NPs from Eucalyptus globulus leaves being observed. Therefore, Eucalyptus globulus leaves are recommended to synthesise NiO NPs for antibacterial applications.

关键词： Antibacterial Eucalyptus globulus Green nanomaterials NiO Persea americana Zea mays

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Two-electron-spin ratchets as a platform for microwave-free dynamic nuclear polarization of arbitrary material targets

arXiv

引用

arXiv 2019年

作者： Zangara, Pablo R. Henshaw, Jacob Pagliero, Daniela Ajoy, Ashok Reimer, Jeffrey A. Pines, Alexander Meriles, Carlos A. Dept. of Physics CUNY-City College of New York New YorkNY10031 United States CUNY-Graduate Center New YorkNY10016 United States Department of Chemistry University of California Berkeley Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Chemical and Biomolecular Engineering Materials Science Division Lawrence Berkeley National Laboratory University of California BerkeleyCA94720 United States

Optically-pumped color centers in semiconductor powders can potentially induce high levels of nuclear spin polarization in surrounding solids or fluids at or near ambient conditions, but complications stemming from the random orientation of the particles and the presence of unpolarized paramagnetic defects hinder the flow of polarization beyond the defect's host material. Here, we theoretically study the spin dynamics of interacting nitrogen-vacancy (NV) and substitutional nitrogen (P1) centers in diamond to show that outside protons spin-polarize efficiently upon a magnetic field sweep across the NV-P1 level anti-crossing. The process can be interpreted in terms of an NV-P1 spin ratchet, whose handedness -and hence the sign of the resulting nuclear polarization - depends on the relative timing of the optical excitation pulse. Further, we find that the polarization transfer process is nearly independent of the the polarization transfer mechanism is robust to NV misal iNgnVm aexnits roerliaetnivtaet itoon t, h e external magnetic field, and efficient over a broad range of electron-electron and electron-nuclear spin couplings, even if proxy spins feature short coherence or spinlattice relaxation times. Therefore, these results pave the route towards the dynamic nuclear polarization of arbitrary spin targets brought in proximity with a diamond powder under ambient conditions. Copyright © 2019, The Authors. All rights reserved.

关键词： Spin polarization

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