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arXiv 2024年

作者： Ren, Zheng Huang, Jianwei Tan, Hengxin Biswas, Ananya Pulkkinen, Aki Zhang, Yichen Xie, Yaofeng Yue, Ziqin Chen, Lei Xie, Fang Allen, Kevin Wu, Han Ren, Qirui Rajapitamahuni, Anil Kundu, Asish K. Vescovo, Elio Kono, Junichiro Morosan, Emilia Dai, Pengcheng Zhu, Jian-Xin Si, Qimiao Minár, Ján Yan, Binghai Yi, Ming Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Condensed Matter Physics Weizmann Institute of Science Rehovot Israel New Technologies-Research Center University of West Bohemia Plzeň301 00 Czech Republic Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States National Synchrotron Light Source II Brookhaven National Lab UptonNY United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Chemistry Rice University HoustonTX77005 United States Theoretical Division Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM United States

Magnetic kagome materials provide a fascinating playground for exploring the interplay of magnetism, correlation and topology. Many magnetic kagome systems have been reported including the binary FemXn (X=Sn, Ge;m:n = 3:1, 3:2, 1:1) family and the rare earth RMn6Sn6 (R = rare earth) family, where their kagome flat bands are calculated to be near the Fermi level in the paramagnetic phase. While partially filling a kagome flat band is predicted to give rise to a Stoner-type ferromagnetism, experimental visualization of the magnetic splitting across the ordering temperature has not been reported for any of these systems due to the high ordering temperatures, hence leaving the nature of magnetism in kagome magnets an open question. Here, we probe the electronic structure with angle-resolved photoemission spectroscopy in a kagome magnet thin film FeSn synthesized using molecular beam epitaxy. We identify the exchange-split kagome flat bands, whose splitting persists above the magnetic ordering temperature, indicative of a local moment picture. Such local moments in the presence of the topological flat band are consistent with the compact molecular orbitals predicted in theory. We further observe a large spin-orbital selective band renormalization in the Fe dxy+dx2-y2spin majority channel reminiscent of the orbital selective correlation effects in the iron-based superconductors. Our discovery of the coexistence of local moments with topological flat bands in a kagome system echoes similar findings in magic-angle twisted bilayer graphene, and provides a basis for theoretical effort towards modeling correlation effects in magnetic flat band systems. © 2024, CC BY.

关键词： Iron-based Superconductors

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Transition-Metal Dichalcogenides: Anisotropic Collective Charge Excitations in Quasimetallic 2D Transition-Metal Dichalcogenides (Adv. Sci. 10/2020)

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Advanced science 2020年第10期7卷 2070055-2070055页

作者： Chi Sin Tang Xinmao Yin Ming Yang Di Wu Jing Wu Lai Mun Wong Changjian Li Shi Wun Tong Yung-Huang Chang Fangping Ouyang Yuan Ping Feng Shi Jie Wang Dongzhi Chi Mark B. H. Breese Wenjing Zhang Andrivo Rusydi Andrew T. S. Wee Department of Physics Faculty of Science National University of Singapore S12 Science Drive 3 Singapore 117551 Singapore NUS Graduate School for Integrative Sciences and Engineering National University of Singapore 21 Lower Kent Ridge Singapore 119077 Singapore Singapore Synchrotron Light Source (SSLS) National University of Singapore 5 Research Link Singapore 117603 Singapore Institute of Materials Research and Engineering (IMRE) A*STAR (Agency for Science Technology and Research) 2 Fusionopolis Way Innovis Singapore 138634 Singapore International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Shenzhen University Shenzhen 518060 China School of Physics and Electronics Central South University No. 932 South Lushan Road Changsha Hunan 410083 China Department of Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore Bachelor Program in Interdisciplinary Studies National Yunlin University of Science and Technology 123 University Road Section 3 Douliou Yunlin 64002 Taiwan

In article number https://***/10.1002/advs.201902726 , Xinmao Yin, Andrew T. S. Wee, and co‐workers observe 1D mid‐IR range anisotropic plasmons in quasi‐metallic WSe 2 and MoS 2 monolayers. In‐depth analysis reveals that the long‐range inter‐chain coupling is responsible for the 1D‐charge dynamics and the plasmon energy is dictated by the effects of spin–orbit coupling. Detailed investigation into these collective modes in 2D‐chained systems opens new opportunities for novel device applications and holds significant implications to the underlying mechanism that governs superconductivity in 2D‐transition‐metal dichalcogenide systems.

关键词： anisotropic charge dynamics phase transitions plasmons spectroscopic ellipsometry transition-metal dichalcogenides

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2-[(Hydroxymethyl)amino]ethanol in water as a preservative: Study of formaldehyde released by Taguchi's method

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IOP Conference Series: Earth and Environmental science 2016年第1期36卷

作者： W Wisessirikul S Loykulnant S Montha T Fhulua P Prapainainar Interdisciplinary Graduate Program in Advanced and Sustainable Environmental Engineering Thailand Advanced Institute of Science and Technology and Tokyo Institute of Technology Kasetsart University Bangkok 10900 Thailand Natural Rubber Focus Unit National Metal and Materials Technology Center NSTDA 111 Paholyothin Rd. Klong 1 Klong Luang Pathumthani 12120 Thailand Environment Research Unit National Metal and Materials Technology Center NSTDA 111 Paholyothin Rd. Klong 1 Klong Luang Pathumthani 12120 Thailand National Center of Excellence for Petroleum Petrochemicals and Advance Materials Department of Chemical Engineering Faculty of Engineering Kasetsart University Thailand Center of Excellence of Nanotechnology Kasetsart University Thailand

This research studied the quantity of free formaldehyde released from 2- [(hydroxymethyl)amino]ethanol (HAE) in DI water and natural rubber latex mixture using high-performance liquid chromatography (HPLC) technique. The quantity of formaldehyde retained in the solution was cross-checked by using titration technique. The investigated factors were the concentration of preservative (HAE), pH, and temperature. Taguchi's method was used to design the experiments. The number of experiments was reduced to 16 experiments from all possible experiments by orthogonal arrays (3 factors and 4 levels in each factor). Minitab program was used as a tool for statistical calculation and for finding the suitable condition for the preservative system. HPLC studies showed that higher temperature and higher concentration of the preservative influence the amount of formaldehyde released. It was found that conditions at which formaldehyde was released in the lowest amount were 1.6%w/v HAE, 4 to 40 °C, and the original pH. Nevertheless, the pH value of NR latex should be more than 10 (the suitable pH value was found to be 13). This preservative can be used to replace current preservative systems and can maintain the quality of latex for long-term storage. Use of the proposed preservative system was also shown to have reduced impact on the toxicity of the environment.

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Glycopolymer Microarrays with Sub-Femtomolar Avidity for Glycan Binding Proteins Prepared by Grafted-To/Grafted-From Photopolymerizations

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Angewandte Chemie 2021年第37期133卷

作者： Daniel J. Valles Yerzhan S. Zholdassov Joanna Korpanty Samiha Uddin Yasir Naeem Prof. David R. Mootoo Prof. Nathan C. Gianneschi Prof. Adam B. Braunschweig The PhD program in Chemistry Graduate Center of the City University of New York 365 5th Ave New York NY 10016 USA Advanced Science Research Center at the Graduate Center The City University of New York 85 St. Nicholas Terrace New York NY 10031 USA Department of Chemistry Hunter College 695 Park Ave New York NY 10065 USA Department of Chemistry Northwestern University Evanston IL 60208 USA Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA Department of Biomedical Engineering Northwestern University Evanston IL 60208 USA The PhD program in Biochemistry Graduate Center of the City University of New York 365 5th Ave New York NY 10016 USA

We report a novel glycan array architecture that binds the mannose-specific glycan binding protein, concanavalin A (ConA), with sub-femtomolar avidity. A new radical photopolymerization developed specifically for this application combines the grafted-from thiol–(meth)acrylate polymerization with thiol–ene chemistry to graft glycans to the growing polymer brushes. The propagation of the brushes was studied by carrying out this grafted-to/grafted-from radical photopolymerization (GTGFRP) at >400 different conditions using hypersurface photolithography, a printing strategy that substantially accelerates reaction discovery and optimization on surfaces. The effect of brush height and the grafting density of mannosides on the binding of ConA to the brushes was studied systematically, and we found that multivalent and cooperative binding account for the unprecedented sensitivity of the GTGFRP brushes. This study further demonstrates the ease with which new chemistry can be tailored for an application as a result of the advantages of hypersurface photolithography.

关键词： glycopolymers lectins lithography microarrays thiol–ene

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Magnetic Nanocoils: Remote Control of Time-Regulated Stretching of Ligand-Presenting Nanocoils In Situ Regulates the Cyclic Adhesion and Differentiation of Stem Cells (Adv. Mater. 11/2021)

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Advanced materials 2021年第11期33卷

作者： Sunhong Min Min Jun Ko Hee Joon Jung Wonsik Kim Seong-Beom Han Yuri Kim Gunhyu Bae Sungkyu Lee Ramar Thangam Hyojun Choi Na Li Jeong Eun Shin Yoo Sang Jeon Hyeon Su Park Yu Jin Kim Uday Kumar Sukumar Jae-Jun Song Seung-Keun Park Seung-Ho Yu Yun Chan Kang Ki-Bum Lee Qiang Wei Dong-Hwee Kim Seung Min Han Ramasamy Paulmurugan Young Keun Kim Heemin Kang Department of Materials Science and Engineering Korea University Seoul 02841 Republic of Korea Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA International Institute for Nanotechnology Evanston IL USA NUANCE Center Northwestern University Evanston IL USA Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 Republic of Korea Department of Otorhinolaryngology-Head and Neck Surgery Korea University College of Medicine Seoul 08308 Republic of Korea Department of Radiology Molecular Imaging Program at Stanford Stanford University School of Medicine Stanford University Palo Alto CA 94304 USA Department of Chemical Engineering Kongju National University Cheonan 31080 Republic of Korea Department of Chemical and Biological Engineering Korea University Seoul 02841 Republic of Korea Department of Chemistry and Chemical Biology Rutgers University Piscataway NJ 08854 USA College of Polymer Science and Engineering State Key Laboratory of Polymer Materials and Engineering Sichuan University Chengdu 610065 China Department of Radiology Canary Center at Stanford for Cancer Early Detection Stanford University School of Medicine Stanford University Palo Alto CA 94304 USA Department of Biomicrosystem Technology Korea University Seoul 02841 Republic of Korea

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Cover Feature: Design of a Metal–Organic Framework-Derived Co9S8/S Material for Achieving High Durability and High Performance of Lithium–Sulfur Batteries (ChemElectroChem 16/2021)

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ChemElectroChem 2021年第16期8卷

作者： Arif I. Inamdar Nahid Kaisar Saqib Kamal Tzuoo-Tsair Luo Prof. Dr. Shyankay Jou Prof. Dr. Chih-Wei Chu Prof. Dr. Ming-Hsi Chiang Prof. Dr. Kuang-Lieh Lu Institute of Chemistry Academia Sinica 115 Taipei Taiwan Department of Applied Chemistry National Yang Ming Chiao Tung University 300 Hsinchu Taiwan Sustainable Chemical Science and Technology Taiwan International Graduate Program Institute of Chemistry Academia Sinica 115 Taipei Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology 106 Taipei Taiwan Research Center for Applied Sciences Academia Sinica 115 Taipei Taiwan Molecular Science and Technology Taiwan International Graduate Program Institute of Atomic and Molecular Science Academia Sinica 115 Taipei Taiwan Department of Chemistry Fu Jen Catholic University 242 New Taipei City Taiwan Department of Chemistry National Tsing Hua University 300 Hsinchu Taiwan Department of Medicinal and Applied Chemistry Kaohsiung Medical University 807 Kaohsiung Taiwan

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Benchmark problems for transcranial ultrasound simulation: Intercomparison of compressional wave models

arXiv

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arXiv 2022年

作者： Aubry, Jean-Francois Bates, Oscar Boehm, Christian Pauly, Kim Butts Christensen, Douglas Cueto, Carlos Gélat, Pierre Guasch, Lluis Jaros, Jiri Jing, Yun Jones, Rebecca Li, Ningrui Marty, Patrick Montanaro, Hazael Neufeld, Esra Pichardo, Samuel Pinton, Gianmarco Pulkkinen, Aki Stanziola, Antonio Thielscher, Axel Treeby, Bradley Van't Wout, Elwin Physics for Medicine Paris INSERM U1273 ESPCI Paris PSL University CNRS UMR 8063 France Department of Bioengineering Imperial College London Exhibition Road LondonSW7 2AZ United Kingdom Institute of Geophysics ETH Zürich Sonneggstrasse 5 Zürich8092 Switzerland Department of Radiology Stanford University StanfordCA United States Department of Biomedical Engineering Department of Electrical and Computer Engineering University of Utah United States Department of Surgical Biotechnology Division of Surgery and Interventional Science University College London LondonNW3 2PF United Kingdom Earth Science and Engineering Department Imperial College London London United Kingdom Centre of Excellence IT4Innovations Faculty of Information Technology Brno University of Technology Bozetechova 2 Brno612 00 Czech Republic Graduate Program in Acoustics The Pennsylvania State University University Park PA16802 United States Joint Department of Biomedical Engineering University of North Carolina at Chapel Hill North Carolina State University NC United States Department of Electrical Engineering Stanford University StanfordCA United States Zurich Switzerland Laboratory for Acoustics / Noise control Empa Swiss Federal Laboratories for Materials Science and Technology Dubendorf Switzerland Zurich Switzerland Radiology and Clinical Neurosciences Departments Cumming School of Medicine University of Calgary Canada Department of Applied Physics University of Eastern Finland Kuopio70211 Finland Department of Medical Physics and Biomedical Engineering University College London Gower Street LondonWC1E 6BT United Kingdom Technical University of Denmark Denmark Danish Research Center for Magnetic Resonance Copenhagen University Hospital Hvidovre Denmark Institute for Mathematical and Computational Engineering School of Engineering and Faculty of Mathematics Pontificia Universidad Catolica de Chile Santiago Chile

Computational models of acoustic wave propagation are frequently used in transcranial ultrasound therapy, for example, to calculate the intracranial pressure field or to calculate phase delays to correct for skull distortions. To allow intercomparison between the different modeling tools and techniques used by the community, an international working group was convened to formulate a set of numerical benchmarks. Here, these benchmarks are presented, along with intercomparison results. Nine different benchmarks of increasing geometric complexity are defined. These include a single-layer planar bone immersed in water, a multi-layer bone, and a whole skull. Two transducer configurations are considered (a focused bowl and a plane piston), giving a total of 18 permutations of the benchmarks. Eleven different modeling tools are used to compute the benchmark results. The models span a wide range of numerical techniques, including the finite-difference time-domain method, angular-spectrum method, pseudospectral method, boundary-element method, and spectral-element method. Good agreement is found between the models, particularly for the position, size, and magnitude of the acoustic focus within the skull. When comparing results for each model with every other model in a cross comparison, the median values for each benchmark for the difference in focal pressure and position are less than 10% and 1 mm, respectively. The benchmark definitions, model results, and intercomparison codes are freely available to facilitate further comparisons. Copyright © 2022, The Authors. All rights reserved.

关键词： Bone

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Reversible Handedness Inversion and Circularly Polarized Light Reflection Tuning in Self-Organized Helical Superstructures Using Visible-Light-Driven Macrocyclic Chiral Switches

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Angewandte Chemie 2022年第8期135卷

作者： Dr. Hao Wang Yuqi Tang Dr. Hari Krishna Bisoyi Prof. Quan Li Advanced Materials and Liquid Crystal Institute and Materials Science Graduate Program Kent State University Kent OH 44242 USA Contribution: Formal analysis (lead) Investigation (lead) Writing - original draft (lead) Writing - review & editing (supporting) Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China Contribution: Formal analysis (supporting) Writing - original draft (supporting) Writing - review & editing (supporting) Contribution: Conceptualization (lead) Formal analysis (supporting) Supervision (lead) Writing - original draft (supporting) Writing - review & editing (lead)

A series of macrocyclic azobenzene-based chiral photoswitches have been judiciously designed, synthesized, and characterized. In the molecular structures, binaphthyl is covalently linked to ortho -positions of azobenzene, and four different substituents are linked to 6,6′-positions of binaphthyl. The photoswitches show enhanced helical twisting power (HTP) when doping in commercially available achiral liquid crystals to form self-organized helical superstructures, i.e., cholesteric liquid crystals (CLCs). All the photoswitches exhibit reversible photoisomerization driven by visible light of different wavelengths in both organic solvent and liquid crystals. The photoswitches with shorter substituents enable handedness inversion of CLCs upon photoisomerization. These are the first examples of ortho -linked azobenzene-based photoswitches that enable handedness inversion in CLCs. The photoswitches with longer substituents display only HTP values decreasing while maintaining the same handedness.

关键词： Circularly Polarized Light Handedness Inversion Macrocyclic Photoswitch Visible Light

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Cover Picture: Addressing Environmental Challenges of Porphyrin Mixtures Obtained from Statistical Syntheses (Chemistry - Methods 3/2021)

Chemistry–Methods

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Chemistry–Methods 2021年第3期1卷

作者： Helen Hölzel Maximilian Muth Prof. Dr. Dominik Lungerich Prof. Dr. Norbert Jux Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM) Friedrich-Alexander-University Erlangen-Nuernberg Nikolaus-Fiebiger-Str. 10 91058 Erlangen Germany Center for Nanomedicine Institute for Basic Science (IBS) 50 Yonsei-ro Seodaemun-gu Seoul 03722 South Korea Graduate Program for Nano Biomedical Engineering (NanoBME) Advanced Science Institute Yonsei University 50 Yonsei-ro Seodaemun-gu Seoul 03722 South Korea

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Correction: Advanced anti-corrosion coatings prepared from α-zirconium phosphate/polyurethane nanocomposites

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RSC Advances 2017年第36期7卷 22540-22540页

作者： Tsao-Cheng Huang Guan-Hui Lai Chen-En Li Mei-Hui Tsai Peng-Yun Wang Yi-Hsiu Chung Meng-Hung Lin Department of Chemical and Materials Engineering National Chin-Yi University of Technology 41170 Taichung Taiwan Republic of China Ph. D. Program Graduate Institute of Precision Manufacturing National Chin-Yi University of Technology 41170 Taichung Taiwan Republic of China Department Chemical Engineering Tatung University 104 Taipei Taiwan Republic of China National Chung-Shan Institute of Science and Technology Aeronautical Systems Research Division 40722 Taichung Taiwan Republic of China

Correction for ‘Advanced anti-corrosion coatings prepared from α-zirconium phosphate/polyurethane nanocomposites’ by Tsao-Cheng Huang et al., RSC Adv., 2017, 7, 9908–9913.

Correction for ‘Advanced anti-corrosion coatings prepared from α-zirconium phosphate/polyurethane nanocomposites’ by Tsao-Cheng Huang et al., RSC Adv., 2017, 7, 9908–9913.

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