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Hydrogen production by steam reforming of fusel oil over Ni-based fiber catalyst

materials Today: Proceedings 2022年 57卷 1147-1153页

作者： Le-Mai, T.H. Mhadmhan, S. Trieu, T.Q. Prasongthum, N. Suriya, P. Reubroycharoen, P. Department of Chemical Technology Faculty of Science Chulalongkorn University Bangkok10330 Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University Research Building Bangkok10330 Thailand Program of Petrochemistry Faculty of Chemical Engineering Industrial University of Ho Chi Minh City 70000 Viet Nam Pathum Thani12120 Thailand

This research aimed to evaluate the fusel oil steam reforming over Ni/carbon nanotubes-silica fiber (Ni/CNTs-SF) catalysts prepared by impregnation method with 10 wt% of Ni loading. CNTs-SF was synthesized by chemical vapor deposition (CVD) using ethanol as a source for CNTs over steam reforming. The prepared catalysts were analyzed by BET, XRD, TEM, FESEM-EDS, Raman, and TG/DTG. Ni/CNTs-SF catalyst was tested for fusel oil steam reforming and compared with Ni supported on conventional silica such as a silica fiber (SF) and a silica porous (SP) at the same loading. The results found that Ni/CNTs-SF catalyst showed better catalytic activity and stability than Ni/SF and Ni/SP. TGA profile of the catalysts after fusel oil steam reforming showed that the severe carbon deposited over Ni/SP at 64% (wt%), while at 31% was found over Ni/CNTs-SF catalyst and Ni/SF catalyst. In addition, Ni/CNTs-SF catalyst exhibited the highest hydrogen yield at 15%, and Ni/SF and Ni/SP catalysts gave a lower yield of hydrogen at 11% and 7%, respectively. © 2021

关键词： Carbon nanotubes

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Tuning of Carrier Envelope Offset Frequency in Octave-Spanning Si3N4 Microcomb

Tuning of Carrier Envelope Offset Frequency in Octave-Spanni...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Chin, Hsiao Hsuan Melton, Tristan Aldhafeeri, Alwaleed Rukh, Lala Colación, Gabriel M. Chen, Yujie Cheng, Xiang Chang, Kai-Chi Drake, Tara E. Wong, Chee Wei Mesoscopic Optics and Quantum Electronics Laboratory University of California Los AngelesCA90095 United States Optical Science & Engineering Program Center for High Technology Materials University of New Mexico 1313 Goddard SE AlbuquerqueNM87106 United States Dept. of Physics and Astronomy University of New Mexico AlbuquerqueNM87106 United States

We demonstrate the tuning of carrier envelope offset frequency in chip-scale micro-resonator and the effects on the spectrum, providing a pathway to f-2f stabilization. CLEO 2024 © Optica Publishing Group 2024 &#... 详细信息

ISBN: (纸本)9781957171395

关键词： Laser tuning

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Tuning of Carrier Envelope Offset Frequency in Octave-Spanning Si3N4 Microcomb

Tuning of Carrier Envelope Offset Frequency in Octave-Spanni...

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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

We demonstrate the tuning of carrier envelope offset frequency in chip-scale micro-resonator and the effects on the spectrum, providing a pathway to f-2f stabilization. © Optica Publishing Group 2024

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Diving into COVID-19: Visualizing SARS-CoV-2 Patient Proteins using Liquid-Electron Microscopy

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 662-664页

作者： Berry, Samantha DiCecco, Liza-Anastasia Gray, Jennifer Boylan, Jack Solares, Maria Kelly, Deborah F. Department of Biomedical Engineering Pennsylvania State University University Park PA United States Department of Materials Science and Engineering McMaster University Hamilton ON Canada Materials Research Institute Pennsylvania State University University Park PA United States Molecular Cellular Integrative Biosciences Graduate Program Huck Institutes of the Life Sciences Pennsylvania State University University Park PA United States Huck Institutes of the Life Sciences Pennsylvania State University University Park PA United States

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Understanding the effect of curvature on the magnetization reversal of three-dimensional nanohelices

arXiv

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arXiv 2023年

作者： Fullerton, John McCray, Arthur R.C. Petford-Long, Amanda K. Phatak, Charudatta Materials Science Division Argonne National Laboratory LemontIL United States Applied Physics Program Northwestern University EvanstonIL United States Department of Materials Science and Engineering Northwestern University EvanstonIL United States

Comprehending the interaction between geometry and magnetism in three-dimensional (3D) nanostructures is of importance to understand the fundamental physics of domain wall (DW) formation and pinning. Here, we use focused electron beam-induced deposition to fabricate magnetic nanohelices with increasing helical curvature with height. Using electron tomography and Lorentz transmission electron microscopy, we reconstruct the 3D structure and magnetization of the nanohelices. The surface curvature, helical curvature and torsion of the nanohelices are then quantified from the tomographic reconstructions. Furthermore, by using the experimental 3D reconstructions as inputs for micromagnetic simulations we can reveal the influence of surface and helical curvature on the magnetic reversal mechanism. Hence, we can directly correlate the magnetic behavior of a 3D nanohelix to its experimental structure. These results demonstrate how control of geometry in nanohelices can be utilized in the stabilization of DWs and control of the response of the nanostructure to applied magnetic fields. Copyright © 2023, The Authors. All rights reserved.

关键词： Magnetization reversal

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Impact of In flux on self-assembled InGaN/GaN superlattice grown on GaN template by plasma-assisted molecular beam epitaxy

Impact of In flux on self-assembled InGaN/GaN superlattice g...

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2022 Compound Semiconductor Week, CSW 2022

作者： Khan, Kamruzzaman Sun, Kai Wurm, Christian Ahmadi, Elaheh University of Michigan Department of Materials Science and Engineering Ann ArborMI United States University of California Department of Electrical and Computer Engineering Santa BarbaraCA United States University of Michigan Department of Electrical Engineering and Computer Science Ann ArborMI United States University of Michigan Applied Physics Program Ann ArborMI United States

ISBN: (数字)9781665453400

ISBN: (纸本)9781665453400

We have previously reported spontanous formation of InGaN/GaN superlattice structure on nominal InGaN films grown by plasma-assisted molecular beam epitaxy (PAMBE). In this work, we report on the impact of In flux on the formation and periodicity of self-assembled InxGa1-xN/InyGa1-yN superlattice structure (SASL). We show that the thickness and In composition in the InGaN layer varies by changing the In flux. These films were stucturally characterized by X-ray diffraction and simulated by globalfit software to get the thickness and In composition. The superlattice structures were confimred by scanning transmission electron microscopy and the thickness of InGaN layer and In composition were determined by energy dispersive X-ray spectroscopy. This work can provide a method for using the SASL with better control for their optoelectronics application. © 2022 IEEE.

关键词： III-V semiconductors

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New Insights into the Effects of Available Space Characteristics within Graphite-Based Anodes on the Accessibility of Solvated Li-Ions Under Fast Charging Conditions

SSRN

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SSRN 2022年

作者： Kim, Jaewook Cho, Hang In Cho, Young Shik Lee, Sung Hoon Park, Chong Rae WCU Hybrid Materials Program Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University Seoul08826 Korea Republic of

Energy storage materials for energy storage system or electric vehicle should be able to supply high capacity quickly. Especially, Li-ion accessibility within graphite-based anodes is the key point to enhance mass transfer and the electrochemical performance. In terms of solvated Li-ion accessibility to the space, space in graphite-based anode is classified as two consecutive scales, channel and surface pores. A Li-ion transferrable channel is controlled by the calendering process, and surface pores are modified with a chemical vapor deposition surface coating to enhance the solvated Li-ion accessibility in each space. Cross-analysis of BET with small-angle X-ray scattering was conducted to determine whether each space is accessible and where the optimal point is. Finding correlations with the tortuosity value provided not only quantitative but also geometrical information on the space which was derived from the making process of each electrode, reflecting actual solvated Li-ion movement. This study not only suggests two distinguishable views in enhancing the accessibility of solvated Li-ions but also presents new insights to figure out how the changes in space characteristics affect the electrochemical performance. Furthermore, these findings could provide a potential strategy to estimate commercialized graphite such that the actual solvated Li-ion movement can be interpreted. © 2022, The Authors. All rights reserved.

关键词： Ions

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PET-derived bis(2-hydroxyethyl) terephthalate as a new linker source for solvent-free and hydrothermal synthesis of BDC-based MOFs

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materials Today Nano 2024年 25卷

作者： Krisbiantoro, Philip Anggo Kuo, Tzu-Jung Chang, Yu-Chia Liao, Weisheng Sun, Jih-Peng Yang, Chun-Yen Kamiya, Yuichi Shieh, Fa-Kuen Chen, Chia-Chin Wu, Kevin C.-W Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Faculty of Environmental Earth Science Hokkaido University Nishi 5 Kita 10 Kita-ku Sapporo060-0810 Japan Department of Chemistry National Central University Taoyuan32001 Taiwan Center of Atomic Initiative for New Materials National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taoyuan Taiwan

To date, the high cost of organic linkers and the energy-consuming synthesis processes remain two of the main challenges for the commercialization of metal-organic frameworks (MOFs). Herein, we demonstrate that polyethylene terephthalate (PET)-derived bis(2-hydroxyethyl) terephthalate (BHET) is a new linker source that enables the facile solvent-free and hydrothermal synthesis of BDC-based MOFs. Using BHET as a linker source, UiO-66(Zr) was rapidly synthesized via a solvent-free "grind and bake" technique, while Ca-BDC and Ba-BDC were easily obtained by using hydrothermal synthesis. We found that the hydrolysis of BHET to terephthalate anion (BDC2−) over proton produced from the hydrolysis/clustering of Zr precursor and hydroxyl anion produced from the dissolution of M(OH)2 (M = Ca or Ba) was the key to the crystal growth of solvent-free synthesized UiO-66(Zr) and hydrothermally synthesized M-BDC (M = Ca or Ba), respectively. While the as-synthesized UiO-66(Zr) was highly active for the esterification of lactic acid (LA) with ethanol (EtOH), Ca-BDC and Ba-BDC exhibited remarkable electrochemical performance for lithium storage. Our strategy provides a major step towards realizing the idea of a more facile, green, and low-cost synthesis of PET-derived MOFs compared to prior arts applicable for catalysis and energy applications. © 2024

关键词： Lithium-ion batteries

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Emergent magnetic phases and piezomagnetic effects in MnxNi1−xF2 thin film alloys

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Physical Review B 2023年第13期108卷 134437-134437页

作者： Ryan Van Haren Nessa Hald David Lederman Department of Physics University of California Santa Cruz Santa Cruz California 95064 USA Materials Science and Engineering Program School for Engineering of Energy Matter and Transport Arizona State University Tempe Arizona 85287 USA

The effect of random competing single-ion anisotropies in antiferromagnets was studied using epitaxial MnxNi1−xF2 antiferromagnetic thin film alloys grown via molecular beam epitaxy. The crystal structure of this material is tetragonal for all values of x, and the Mn sites have a magnetic easy-axis single-ion anisotropy while the Ni sites have an easy-plane anisotropy perpendicular to the Mn easy axis. Crystallographic and magnetization measurements demonstrated that the thin film alloys were homogeneously mixed and did not phase separate into their constituent parts. Pure MnF2 thin films epitaxially grown on MgF2 exhibited compressive strain along all three crystallographic axes which resulted in piezomagnetic effects. The piezomagnetism disappeared if the film was grown on a (MnNi)F2 graded buffer layer. A mean-field theory fit to the transition temperature as a function of the Mn concentration x, which takes into account piezomagnetic effects, gave a magnetic exchange constant between Mn and Ni ions of JMnNi=0.305±0.003meV. Mean-field theory calculations also predicted the existence of an oblique antiferromagnetic phase in the MnxNi1−xF2 alloy which agreed with the experimental data. A magnetic phase diagram for MnxNi1−xF2 thin film alloys was constructed and showed evidence for the existence of two unique magnetic phases, in addition to the ordinary antiferromagnetic and paramagnetic phases: an oblique antiferromagnetic phase, and an emergent magnetic phase proposed to be either a magnetic glassy phase or a helical phase. The phase diagram is quantitatively different from that of FexNi1−xF2 because of the much larger single-ion anisotropy of Fe2+ compared to Mn2+.

关键词： Epitaxial strain Magnetic anisotropy Magnetic interactions Magnetic phase transitions Magnetism Alloys Antiferromagnets Magnetic thin films Solid solutions Thin films Crystallography Mean field theory Molecular beam epitaxy Susceptibility measurements X-ray diffraction

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Synergetic effects of multiple junction and surface hydroxyl in Cu/CuO/Cu2O/TiO2 heterostructures towards highly efficient photocatalysts for hydrogen generation

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materials science for Energy Technologies 2025年 8卷 131-142页

作者： Subagyo, Riki Anindika, Garcelina Rizky Aufkani, Afif Akmal Zhang, Lei Ardhyananta, Hosta Burhan, R.Y. Perry Nugraheni, Zjahra Vianita Akhlus, Syafsir Bahruji, Hasliza Prasetyoko, Didik Wellia, Diana Vanda Ivansyah, Atthar Luqman Arramel Kusumawati, Yuly Department of Chemistry Faculty of Science and Analytic Data Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Center of Excellence Applied Physics and Chemistry Nano Center Indonesia Jl PUSPIPTEK South Tangerang Banten15314 Indonesia Department of Physics National University of Singapore Singapore117551 Singapore Department of Materials and Metallurgical Engineering Faculty of Industrial Technology and Systems Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Centre of Advanced Material and Energy Science Universiti Brunei Darussalam Jalan Tungku Link BE 1410 Brunei Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Padang25163 Indonesia Master Program in Computational Science Faculty of Mathematics and Natural Science Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung40132 Indonesia Instrumentation and Computational Physics Research Group Department of Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha No.10 West Java Bandung40132 Indonesia

The implementation of titanium dioxide (TiO2) as a photocatalyst material in hydrogen (H2) evolution reaction (HER) has embarked renewed interest in the past decade. Rapid electron-hole pairs recombination and wide band gap of a photo-sensitive material of TiO2 are detrimental toward the targeted catalytical reaction. In this study, we present the rational design, fabrication, photocatalytic performance of TiO2-Cu/CuO/Cu2O heterostructures (CuTi) using viable chemical reduction method. The Z-scheme and S-scheme are succesfully generated across the TiO2/CuO/Cu2O interfaces, while the Schottky junction arises on the Cu perimeters. This is evidenced from the blue shifted about 0.3 eV of Cu 2p core level determined by using X-ray photoemission spectroscopy (XPS), in combination with the formation of inverse V-shape of the Mott-Schottky plots. In addition, we find that Cu/CuO/Cu2O facilitates photon absorption range up to the visible region. The multiple heterojunction and the large number of OHsurface enhanced charge carrier transfer are associated to the suppression of photoluminescence (PL) intensity, high surface hydroxyl (OHsurface) density in CuTi probed by XPS, and fast electron transfer based on the electrochemical measurements. The presence of OHsurface inhibits the recombination of electron. A significant H2 photogeneration rate enhancement is achieved when an optimized 5 wt% Cu/CuO/Cu2O concentration is used on TiO2 to achieve 7,157.19 μmol·g−1 (1,789.30 μmol·g−1·h−1). Based on this finding, zero emission energy innitiative could be materialized under multiple heterojunctions in photocatalytic process is beneficial for enhancing the H2 production. © 2025 The Authors

关键词： Titanium dioxide

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