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Rücktitelbild: Robust, Ultrafast and Reversible Photoswitching in Bulk Polymers Enabled by Octupolar Molecule Design (Angew. Chem. 16/2024)

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Angewandte Chemie 2024年第16期136卷

作者： Long Fang Ziwei Lin Yang Zhang Bin Ye Jing Li Qishan Ran Xiaotong Wang Meijia Yang Prof. Zhongke Yuan Prof. Xiaofeng Lin Prof. Dingshan Yu Prof. Xudong Chen Prof. Quan Li Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Key Laboratory of High Performance Polymer-based Composites of Guangdong Province GBRCE for Functional Molecular Engineering School of Chemistry Sun Yat-sen University Guangzhou 510006 China School of Computer Science and Engineering Sun Yat-sen University Guangzhou 510275 China Institute of Applied Physics and Materials Engineering University of Macau Taipa Macao SAR 999078 China School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 China Guangdong Laboratory of Chemistry and Fine Chemical Industry Jieyang Center Jieyang 515200 China Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China Materials Science Graduate Program Kent State University Kent OH 44242 USA

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Back Cover: Robust, Ultrafast and Reversible Photoswitching in Bulk Polymers Enabled by Octupolar Molecule Design (Angew. Chem. Int. Ed. 16/2024)

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Angewandte Chemie International Edition 2024年第16期63卷

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Robust, Ultrafast and Reversible Photoswitching in Bulk Polymers Enabled by Octupolar Molecule Design

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Angewandte Chemie 2024年第16期136卷

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Depinning of the charge-density waves in Quasi-2D 1T-TaS2 devices operating at room temperature

arXiv

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arXiv 2021年

作者： Mohammadzadeh, A. Rehman, A. Kargar, F. Rumyantsev, S. Smulko, J.M. Knap, W. Lake, R.K. Balandin, Alexander A. Nano-Device Laboratory Department of Electrical and Computer Engineering Bourns College of Engineering University of California RiversideCA92521 United States CENTERA Laboratories Institute of High-Pressure Physics Polish Academy of Sciences Warsaw01-142 Poland Phonon Optimized Engineered Materials Center Materials Science and Engineering Program Bourns College of Engineering University of California RiversideCA92521 United States Department of Metrology and Optoelectronics Gdańsk University of Technology Gdańsk80-233 Poland Centre for Advanced Materials and Technologies CEZAMAT Warsaw University of Technology Warsaw02-822 Poland Laboratoire Charles Coulomb University of Montpellier and CNRS Montpellier34950 France Laboratory for Terascale and Terahertz Electronics Department of Electrical and Computer Engineering University of California RiversideCA92521 United States

We report on depinning of nearly-commensurate charge-density waves in 1T-TaS2 thin-films at room temperature. A combination of the differential current-voltage measurements with the low-frequency noise spectroscopy provide unambiguous means for detecting the depinning threshold field in quasi-2D materials. The depinning process in 1T-TaS2 is not accompanied by an observable abrupt increase in electric current – in striking contrast to depinning in the conventional charge-density-wave materials with quasi-1D crystal structure. We explained it by the fact that the current density from the charge-density waves in the 1T-TaS2 devices is orders of magnitude smaller than the current density of the free carriers available in the discommensuration network surrounding the commensurate charge-density-wave islands. The depinning fields in 1T-TaS2 thin-film devices are several orders of magnitude larger than those in quasi-1D van der Waals materials. Obtained results are important for the proposed applications of the charge-density-wave devices in electronics. Copyright © 2021, The Authors. All rights reserved.

关键词： Van der Waals forces

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Enhanced Surface Interactions Enable Fast Li+ Conduction in Oxide/Polymer Composite Electrolyte

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Advanced materials 2020年第10期59卷 4160-4166页

作者： Wu, Nan Chien, Po-Hsiu Qian, Yumin Li, Yutao Xu, Henghui Grundish, Nicholas S. Xu, Biyi Jin, Haibo Hu, Yan-Yan Yu, Guihua Goodenough, John B. Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science & Engineering Beijing Institute of Technology Beijing100081 China Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Center of Interdisciplinary Magnetic Resonance National High Magnetic Field Laboratory 1800 East Paul Dirac Drive TallahasseeFL32310 United States Department of Chemistry and Biochemistry Florida State University TallahasseeFL32306 United States

Li+-conducting oxides are considered better ceramic fillers than Li+-insulating oxides for improving Li+ conductivity in composite polymer electrolytes owing to their ability to conduct Li+ through the ceramic oxide as well as across the oxide/polymer interface. Here we use two Li+-insulating oxides (fluorite Gd0.1Ce0.9O1.95 and perovskite La0.8Sr0.2Ga0.8-Mg0.2O2.55) with a high concentration of oxygen vacancies to demonstrate two oxide/poly(ethylene oxide) (PEO)-based polymer composite electrolytes, each with a Li+ conductivity above 10−4 Scm−1 at 30°C. Li solid-state NMR results show an increase in Li+ ions (>10%) occupying the more mobile A2 environment in the composite electrolytes. This increase in A2-site occupancy originates from the strong interaction between the O2− of Li-salt anion and the surface oxygen vacancies of each oxide and contributes to the more facile Li+ transport. All-solid-state Li-metal cells with these composite electrolytes demonstrate a small interfacial resistance with good cycling performance at 35°C. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Ethylene

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Co-MOF-67/carbon black composite: A novel electrochemical platform for furazolidone detection for food analysis

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Food Chemistry 2025年 489卷 145023页

作者： Arunkumar Selvam Meenakumari Gopakumar Gopika Chih-Yu Kuo Beena Saraswathyamma Kareem Yusuf Mani Govindasamy International Graduate Program in Energy and Optoelectronic Materials (EOMP) National Taipei University of Technology Taipei 10608 Taiwan Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei 10608 Taiwan Department of Chemistry Amrita Vishwa Vidyapeetham Amritapuri campus Clappana P O Kollam Kerala 690525 India Department of Chemistry Korea University Seongbuk-gu Seoul Republic of Korea High-Value Biomaterials Research and Commercialization Center National Taipei University of Technology Taipei 106 Taiwan Department of Chemistry College of Science King Saud University Riyadh 11451 Saudi Arabia International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City 243303 Taiwan Research Center for Intelligent Medical Devices Ming Chi University of Technology New Taipei City 243303 Taiwan

Furazolidone (FZD), a nitrofuran antibiotic used for the treatment of bacterial and protozoal illnesses, generates apprehensions about its potential toxicity and mutagenicity. The swift and dependable identification of FZD in food and biological specimens is essential for public health and regulatory adherence. This study presents a novel electrochemical sensor using a glassy carbon electrode (GCE) modified with a cobalt-based metal-organic framework (Co-MOF) and carbon black (CB) composite (Co-MOF@CB/GCE) for the sensitive detection of FZD. The Co-MOF@CB composite enhances electron transport and expands the electroactive surface area. Characterization investigations confirmed the successful fabrication of the Co-MOF@CB/GCE sensor. Electrochemical analyses revealed an extensive detection range (0.4–610 μmolL −1 ) and a minimal detection limit (0.0875 μmolL −1 ). The sensor exhibited great repeatability, stability, and selectivity, demonstrating efficient FZD detection in milk, honey, and chicken. This sensor provides a reliable, economical tool for FZD detection in regulatory and public health contexts.

关键词： Biological analysis Carbon black Cobalt metal-organic framework Electrochemical detection Furazolidone Health care test

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Influence of Al-5.0Nb-0.5B inoculant on the microstructure and mechanical properties of AA 2017 alloy fabricated using laser-based powder bed fusion

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Journal of Alloys and Compounds 2025年 1032卷

作者： dos Santos Bomfim, Pamela Karina Batistão, Bruna Fernanda de Araújo, Aylanna Priscila Marques Pereira, Leandro Henrique Buzolin, Ricardo Henrique Amancio-Filho, Sergio T. Afonso, Conrado Ramos Moreira Bolfarini, Claudemiro Kiminami, Claudio Shyinti Coury, Francisco Gil Gargarella, Piter Graduate Program in Materials Science and Engineering Federal University of São Carlos Rod.Washington Luis Km 235 SP São Carlos13565-905 Brazil High Performance and Lightweight Materials Group kopernikusgasse 24 Graz8010 Austria BMK Endowed Professorship for Aviation Kopernikusgasse 24 Graz8010 Austria Institute of Materials Science Joining and Forming Graz University of Technology Kopernikugasse 24/l Graz80210 Austria Rod. Washington Luiz km 235 São Carlos13565-905 Brazil Center of Characterization and Development of Materials Federal University of São Carlos Rod. Washington Luiz km 235 SP-310 SP São Carlos13565-905 Brazil

This study investigated the influence of the inoculant Al-5.0Nb-0.5B on the microstructure and mechanical properties of the AA 2017 alloy fabricated using laser-based powder bed fusion (L-PBF). The AA 2017 alloy powder was obtained through gas atomization and then mixed with 2 wt% of Al-5.0Nb-0.5B powder (20–53 µm) and synthesized using the L-PBF technique. The small addition of the Al-5.0Nb-0.5B, coupled with specific processing parameters, led to a reduction in the fraction of cracks and transformed the solidification structure from cellular to equiaxial. Additionally, it resulted in a grain size reduction down to 4.0 ± 2.9 µm and a low fiber texture. Due to the refined grains, the AA 2017 samples with 2 wt% Al-5.0Nb-0.5B exhibited a high yield strength of 215 ± 33 MPa and ultimate compressive strength of 602 ± 47 MPa, compared to the AA 2017 alloy samples, which exhibited yield strength of 171 ± 8 MPa and ultimate compressive strength of 427 ± 46 MPa. The addition of a small fraction of Al-5.0Nb-0.5B to the AA 2017 alloy, produced by L-PBF, is a promising alternative for manufacturing lightweight parts with a lower amount of hot cracks and equiaxial microstructure. The results show that the use of inoculant with the micrometric size is an effective alternative to the use of nanoparticles, which has a higher safety risk, is usually difficult to homogenize and may promote agglomeration. © 2025 Elsevier B.V.

关键词： Compressive strength

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Efficient red luminogen with aggregation-induced emission for in vivo three-photon brain vascular imaging

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materials Chemistry Frontiers 2020年第6期4卷 1634-1642页

作者： Haiyan Tian Dongyu Li Xi Tang Yubo Zhang Zhiyong Yang Jun Qian Yong Qiang Dong Mei Han Beijing Key Laboratory of Energy Conversion and Storage Materials Key Laboratory of Radiopharmaceuticals Ministry of Education College of Chemistry Beijing Normal University No. 19 XinJieKouWai Street Beijing 100875 China State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic Research College of Optical Science and Engineering Zhejiang University Hangzhou 310058 China PCFM Lab GDHPPC Lab Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photo-electric Functional Films State Key Laboratory of School of Chemistry Sun Yat-Sen University Guangzhou 510275 China

Nanoparticle-assisted deep-tissue fluorescence imaging is of great significance to bioimaging and disease diagnosis. Through the combination of the electron donor triphenylamine and electron acceptor cyan, the compound 1,1-dicyano-2-phenyl-2-(4-diphenylamino)phenylethylene (DCPE-TPA, 1) was synthesized and exhibited an aggregation-induced emission (AIE) effect. Compound 1 can form three kinds of aggregation states: orange crystals (1OC, 578 nm, Φ_F = 50.6%), red crystals (1RC, 613 nm, Φ_F = 78.4%) and deep-red emissive amorphous solids (1Am, 667 nm, Φ_F = 30.4%) with notable differences in their emission wavelengths and quantum yields. The DCPE-TPA molecules are encapsulated with a polymeric matrix of Pluronic F-127 to form nanoparticles (NPs) that exhibit intense three-photon fluorescence (3PF) in the deep-red region as well as high stability, good photostability and good biocompatibility. Under a 1560 nm fs laser, the DCPE-TPA NPs are further utilized for in vivo 3PF imaging of the vasculature in the brain of a mouse at various vertical depths, producing a penetration depth of 300 μm with a high spatial resolution of 1.8 μm and a high signal-to-background ratio (SBR) of 14. A high-resolution three-dimensional (3D) model of the vasculature beneath the skull could be reconstructed. It is worth mentioning that such a high quantum yield for the deep-red emission of a purely organic material has rarely been reported.

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Protein and lipid expansion microscopy with trypsin and tyramide signal amplification for 3D imaging

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Scientific reports 2023年第1期13卷 21922页

作者： Ueh-Ting Tim Wang Xuejiao Tian Yae-Huei Liou Sue-Ping Lee Hsiao-Tang Hu Chieh-Han Lu Po-Ting Lin Ya-Jen Cheng Peilin Chen Bi-Chang Chen Affiliated Senior High School of National Taiwan Normal University Taipei 106348 Taiwan. Research Center for Applied Sciences Academia Sinica Taipei 11529 Taiwan. Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Tsing Hua University Taipei 11529 Taiwan. Department of Engineering and System Science National Tsing Hua University Hsinchu 300 Taiwan. Institute of Molecular Biology Academia Sinica Taipei 11529 Taiwan. Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei 116 Taiwan. Neuroscience Program NPAS Academia Sinica Taipei 11529 Taiwan ROC. Research Center for Applied Sciences Academia Sinica Taipei 11529 Taiwan. chenb10@gate.sinica.edu.tw.

Expansion microscopy, whereby the relative positions of biomolecules are physically increased via hydrogel expansion, can be used to reveal ultrafine structures of cells under a conventional microscope. Despite its utility for achieving super-resolution imaging, expansion microscopy suffers a major drawback, namely reduced fluorescence signals caused by excessive proteolysis and swelling effects. This caveat results in a lower photon budget and disfavors fluorescence imaging over a large field of view that can cover an entire expanded cell, especially in 3D. In addition, the complex procedures and specialized reagents of expansion microscopy hinder its popularization. Here, we modify expansion microscopy by deploying trypsin digestion to reduce protein loss and tyramide signal amplification to enhance fluorescence signal for point-scanning-based imaging. We name our new methodology TT-ExM to indicate dual trypsin and tyramide treatments. TT-ExM may be applied for both antibody and lipid staining. TT-ExM displayed enhanced protein retention for endoplasmic reticulum and mitochondrial markers in COS-7 cell cultures. Importantly, TT-ExM-based lipid staining clearly revealed the complex 3D membrane structures in entire expanded cells. Through combined lipid and DNA staining, our TT-ExM methodology highlighted mitochondria by revealing their DNA and membrane structures in cytoplasm, as well as the lipid-rich structures formed via phase separation in nuclei at interphase. We also observed lipid-rich chromosome matrices in the mitotic cells. These high-quality 3D images demonstrate the practicality of TT-ExM. Thus, readily available reagents can be deployed in TT-ExM to significantly enhance fluorescence signals and generate high-quality and ultrafine-resolution images under confocal microscopy.

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Graphene composites as efficient electromagnetic absorbers in the extremely high frequency band

arXiv

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arXiv 2020年

作者： Barani, Zahra Kargar, Fariborz Godziszewski, Konrad Rehman, Adil Yashchyshyn, Yevhen Rumyantsev, Sergey Cywiński, Grzegorz Knap, Wojciech Balandin, Alexander A. Department of Electrical and Computer Engineering University of California RiversideCA92521 United States Center Materials Science and Engineering Program University of California RiversideCA92521 United States Institute of Radioelectronics and Multimedia Technology Warsaw University of Technology Warsaw00-665 Poland CENTERA Laboratories Institute of High-Pressure Physics Polish Academy of Sciences Warsaw01-142 Poland CEZAMAT Warsaw University of Technology Warsaw02-822 Poland

We report on the synthesis of the epoxy-based composites with graphene fillers and testing their electromagnetic shielding efficiency by the quasi-optic free-space method in the extremely high frequency (EHF) band (220 - 325 GHz). The curing adhesive composites were produced by a scalable technique with a mixture of single-layer and few-layer graphene layers of a few-micron lateral dimensions. It was found that the electromagnetic transmission, TT, is low even at small concentrations of graphene fillers: TT Copyright © 2020, The Authors. All rights reserved.

关键词： Graphene

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