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Titelbild: Circularly Polarized Luminescence Active Supramolecular Nanotubes Based on PtIIComplexes That Undergo Dynamic Morphological Transformation and Helicity Inversion (Angew. Chem. 38/2022)

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Angewandte Chemie 2022年第38期134卷

作者： Seok Gyu Kang Dr. Ka Young Kim Yumi Cho Dong Yeun Jeong Prof. Ji Ha Lee Prof. Tomoki Nishimura Prof. Shim Sung Lee Prof. Sang Kyu Kwak Prof. Youngmin You Prof. Jong Hwa Jung Department of Chemistry and Research Institution of Natural Sciences Gyeongsang National University (GNU) Jinju 52828 Republic of Korea Department of Energy Enginerring School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea Division of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul 03760 Republic of Korea Chemical Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima 739-8527 Japan Department of Chemistry and Materials Faculty of Textile Science and Technology Shinshu University Nagano 386-8567 Japan

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Circularly Polarized Luminescence Active Supramolecular Nanotubes Based on PtIIComplexes That Undergo Dynamic Morphological Transformation and Helicity Inversion

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Angewandte Chemie 2022年第38期134卷

Circularly polarized luminescence (CPL) with tunable chirality is currently a challenging issue in the development of supramolecular nanomaterials. We herein report the formation of helical nanoribbons which grow into helical tubes through dynamic helicity inversion. For this, chiral Pt II complexes of terpyridine derivatives, namely S - trans - 1 and R - trans - 1 , with respective S - and R -alanine subunits and incorporating trans -double bonds in the alkyl chain were prepared. In DMSO/H 2 O (5 : 1 v / v ), S - trans - 1 initially forms a fibrous self-assembled product, which then undergoes dynamic transformation into helical tubes (left-handed or M -type) through helical ribbons (right-handed or P -type). Interestingly, both helical supramolecular architectures are capable of emitting CPL signals. The metastable helical ribbons show CPL signals ( g lum =±4.7×10 −2 ) at 570 nm. Meanwhile, the nanotubes, which are the thermodynamic products, show intense CPL signals ( g lum =±5.6×10 −2 ) at 610 nm accompanied by helicity inversion. This study provides an efficient way to develop highly dissymmetric CPL nanomaterials by regulating the morphology of metallosupramolecular architectures.

关键词： Circularly Polarized Luminescence Helicity Inversion Morphological Transformation PtII-Complex Supramolecular Nanotubes

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Chiral Phonons in Biocrystals

Research Square

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Research Square 2021年

作者： Choi, Won Jin Yano, Keiichi Cha, Minjeong Colombari, Felippe M. Wang, Yichun Lee, Sang Hyun Kruger, John M. de Moura, André F. Kotov, Nicholas A. Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States Biointerfaces Institute University of Michigan Ann ArborMI48109 United States Department of Chemical Engineering University of Michigan Ann ArborMI48109 United States SP Campinas13.083-100 Brazil Department of Biomedical Engineering University of Michigan Ann ArborMI48109 United States Department of Chemical and Biochemical Engineering University of Notre Dame South BendIN46556 United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Department of Small Animal Clinical Sciences Michigan State University East LansingMI48824 United States Department of Chemistry Federal University of São Carlos SP São Carlos13565-905 Brazil Program in Macromolecular Science and Engineering University of Michigan Ann ArborMI48109 United States

Chiral phonons are concerted mirror-symmetric movements of atomic groups connected by covalent and intermolecular bonds. Finding chiral phonons in biocrystals is fundamentally and technologically important because these lattice vibrations should be highly specific to their short- and long-range organizations. Based on theoretical and experimental data they might be expected but not identified or utilized. Here we show that terahertz chiroptical spectroscopy enables registration and attribution of chiral phonons in microcrystals of numerous amino acids and dipeptides. Theoretical analysis and computer simulations confirm that sharp mirror-symmetric bands observed for left and right enantiomers originate from collective vibrations of biomolecules interconnected by hydrogen bonds into helical chains. Structure-property relationships for strong phonons with rotatory components in biocrystals were also identified. Bladder stones and health supplements display strong spectral signatures of chiral phonons indicating their immediate importance for biomedicine. © 2021, CC BY.

关键词： Phonons

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Two-Step Electronic Response to Magnetic Ordering in a van der Waals Ferromagnet

arXiv

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arXiv 2023年

作者： Wu, Han Zhu, Jian-Xin Chen, Lebing Butcher, Matthew W. Yue, Ziqin Yuan, Dongsheng He, Yu Oh, Ji Seop Huang, Jianwei Wu, Shan Gong, Cheng Guo, Yucheng Mo, Sung-Kwan Denlinger, Jonathan D. Lu, Donghui Hashimoto, Makoto Stone, Matthew B. Kolesnikov, Alexander I. Chi, Songxue Kono, Junichiro Nevidomskyy, Andriy H. Birgeneau, Robert J. Dai, Pengcheng Yi, Ming Department of Physics and Astronomy Rice Center for Quantum Materials Rice University HoustonTX77005 United States Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM87545 United States Department of Physics University of California at Berkeley BerkeleyCA94720 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States 1-1 Namiki Ibaraki Tsukuba305-0044 Japan Department of Applied Physics Yale University New HavenCT06511 United States Department of Electrical and Computer Engineering Quantum Technology Center University of Maryland College ParkMD20742 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States Department of Materials Science and Engineering University of California Berkeley United States

The two-dimensional (2D) material Cr2Ge2Te6 is a member of the class of insulating van der Waals magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te p-orbital-dominated bands to undergo changes at the Curie transition temperature TC while the Cr d-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets. © 2023, CC BY.

关键词： Electronic structure

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Phosphotungstic acid (H₃PW₁₂O₄₀)-loaded onto titanium porous montmorillonite heterostructure for the effective enhanced kinetics and thermodynamic conversion of citronellal

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Case Studies in Chemical and Environmental engineering 2025年 11卷

作者： Fatimah, Is Yahya, Amri Rubiyanto, Dwiarso Sagadevan, Suresh Oh, Won-Chun Doong, Ruey-an Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Islam Indonesia Kampus Terpadu UII Jl. Kaliurang Km 14 Sleman Yogyakarta Indonesia Nanomaterials and Sustainable Chemistry Research Centre Chemistry Laboratory Universitas Islam Indonesia Kampus Terpadu UII Jl. Kaliurang Km 14 Sleman Yogyakarta Indonesia Chemistry Study Program Nusa Bangsa University JL. KH Sholeh Iskandar KM.4 Tanah Sareal Bogor 16166 Indonesia Nanotechnology & Catalysis Research Centre University of Malaya Kuala Lumpur 50603 Malaysia Department of Advanced Materials Science and Engineering Hanseo University Seosan-si 356-706 South Korea Institute of Analytical and Environmental Sciences National Tsing Hua University 101 Sec 2 Kuang Fu Road Hsinchu 30013 Taiwan

In present work, nanocomposite of phosphotungstic acid (H3PW12O40)-loaded onto titanium-porous clay heterostructure (PTA/Ti–PCH) was prepared using natural montmorillonite as parent material (Mnt). Characterization o... 详细信息

In present work, nanocomposite of phosphotungstic acid (H₃PW₁₂O₄₀)-loaded onto titanium-porous clay heterostructure (PTA/Ti–PCH) was prepared using natural montmorillonite as parent material (Mnt). Characterization of the material was performed using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy-energy dispersive X-ray fluorescence, transmission electron microscopy, Fourier-Transform Infra-Red spectroscopy, and solid acidity measurement. The material was examined as superacid catalyst in citronellal conversion into isopulegol by varied reaction conditions. Kinetics and thermodynamic studies of catalyzed reaction revealed the role of increased total surface acidity and the Lewis to Brønsted to enhance the reaction conversion and selectivity. Thermodynamic study demonstrated a lower activation energy of the reaction over PTA/Ti–PCH compared to Ti–PCH. A 100 % conversion was exhibited by the sample during 120 min of the reaction at 90°C, and the sample also demonstrated activity at room temperature. Reusability of the sample was expressed by a maintained conversion until 5th cycle. Conclusively, the prepared material showed a potency to be developed for heterogeneously acid-catalyzed organic reactions. © 2025 The Authors

关键词： Acid Citronellal Clay-based nanocomposite Heterogeneous catalysis Porous clay heterostructure

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Ipmc Electromechanical Behavior Analysis with Reduced Platinum Layer Aiming Economy and Lower Waste Generation

SSRN

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SSRN 2022年

作者： Dardis, Thiago Petrilli Maffei Saccardo, Matheus C. Tozzi, Kaique A. de Blanco, Guilherme Eduardo O. Zuquello, Ariel G. Barbosa, Rafael Scuracchio, Carlos Henrique Gonçalves, Roger Federal University of Sao Carlos Graduate Program in Materials Science and Engineering Sao Carlos Brazil ESPCI Paris PSL Research University 10 Rue Vauquelin Paris75005 France Baalbek Management 16 Rue Debelleyme Paris75003 France Department of Chemical Sciences University of Padova Via Marzolo 1 Padova35131 Italy Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS Grenoble INP LEPMI UMR5279 Grenoble38000 France Federal University of Sao Carlos Graduate Program in Chemistry Sao Carlos Brazil

Ionomeric Polymer-Metal Composites (IPMCs) are smart materials formed by an electroactive polymer membrane coated on both sides by noble metal electrodes. When an electrical stimulus is applied, an electric field is generated between electrodes, and solvated ions migrate inside the polymeric membrane, causing an internal pressure gradient and bending the device. Despite numerous advantages, it is exceedingly expensive to use noble metals, such as gold and platinum. In addition, the deposition process generates a large amount of toxic waste. Thus, in this paper, a Nafion®-based IPMC with a reduced platinum layer (PR-IPMC) was prepared and electromechanically tested, comparing it with a reference IPMC (R-IPMC). The analyses were performed under precise relative humidity (RH) control. Blocking force and current response were used to evaluate its performance, and the morphology of the Pt layer was evaluated through Scanning Electron Microscopy (SEM). The devices performed better when RH = 90%. The PR-IPMC presented a 60% thinner electrode layer. However, just 40% less blocking force compared to R-IPMC. Besides, the reduced amount of platinum complex used to obtain the device represents a saving of reactants and less waste generation, with satisfactory mechanical performance. © 2022, The Authors. All rights reserved.

关键词： Toxic materials

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Corrigendum to “Phosphazene-based covalent organic polymers as metal-free catalysts with improved H 2 generation from NaBH 4 in methanol with superior catalytic activity and re-generation ability” [J. Environ. Chem. Eng. 12 2 (2024) 112066]

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Journal of Environmental Chemical engineering 2024年第6期12卷

作者： Sahin Demirci Mustafa Yildiz Nurettin Sahiner Department of Chemistry Faculty of Sciences and Nanoscience and Technology Research and Application Center (NANORAC) Canakkale Onsekiz Mart University Terzioglu Campus Canakkale 17100 Turkey Department of Ophthalmology Morsani College of Medicine University of South Florida Eye Institute 12901 Bruce B Down Blvd MDC 21 Tampa FL 33612 USA Department of Chemical & Biomedical Engineering Director Materials Science and Engineering Program University of South Florida Tampa FL 33620 USA

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Two-dimensional charge order stabilized in clean polytype heterostructures

arXiv

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arXiv 2021年

作者： Sung, Suk Hyun Schnitzer, Noah Novakov, Steve El Baggari, Ismail Luo, Xiangpeng Gim, Jiseok Vu, Nguyen M. Li, Zidong Brintlinger, Todd H. Liu, Yu Lu, Wenjian Sun, Yuping Deotare, Parag B. Sun, Kai Zhao, Liuyan Kourkoutis, Lena F. Heron, John T. Hovden, Robert Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States Department of Materials Science and Engineering Cornell University IthacaNY14853 United States Kavli Institute at Cornell for Nanoscale Science IthacaNY14853 United States Department of Physics University of Michigan Ann ArborMI48109 United States Department of Physics Cornell University IthacaNY14853 United States Rowland Institute at Harvard CambridgeMA02142 United States Electrical and Computer Engineering Department University of Michigan Ann ArborMI48109 United States Materials Science and Technology Division U.S. Naval Research Laboratory WashingtonDC20375 United States Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei230031 China High Magnetic Field Laboratory Chinese Academy of Sciences Hefei230031 China Collaborative Innovation Centre of Advanced Microstructures Nanjing University Nanjing210093 China Applied Physics Program University of Michigan Ann ArborMI48109 United States School of Applied and Engineering Physics Cornell University IthacaNY14853 United States

Compelling evidence suggests distinct correlated electron behavior may exist only in clean 2D materials such as 1T-TaS2. Unfortunately, experiment and theory suggest that extrinsic disorder in free standing 2D layers disrupts correlation-driven quantum behavior. Here we demonstrate a route to realizing fragile 2D quantum states through endotaxial polytype engineering of van der Waals materials. The true isolation of 2D charge density waves (CDWs) between metallic layers stabilizes commensurate long-range order and lifts the coupling between neighboring CDW layers to restore mirror symmetries via interlayer CDW twinning. The twinned-commensurate charge density wave (tC-CDW) reported herein has a single metal–insulator phase transition at ~350 K as measured structurally and electronically. Fast in-situ transmission electron microscopy and scanned nanobeam diffraction map the formation of tC-CDWs. This work introduces endotaxial polytype engineering of van der Waals materials to access latent 2D ground states distinct from conventional 2D fabrication. © 2021, CC BY.

关键词： Charge density waves

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Semiconductor-metal ultrafast laser welding with relocated filaments 21

Semiconductor-metal ultrafast laser welding with relocated f...

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Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI 2021

作者： Chambonneau, Maxime Li, Qingfeng Fedorov, Vladimir Y. Blothe, Markus Tzortzakis, Stelios Nolte, Stefan Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Albert-Einstein-Straße 15 Jena07745 Germany Science Program Texas AandM University at Qatar P.O. Box 23874 Doha Qatar P. N. Lebedev Physical Institute of the Russian Academy of Sciences 53 Leninskiy Prospekt Moscow119991 Russia P.O. Box 1527 HeraklionGR-71110 Greece Materials Science and Technology Department University of Crete Heraklion71003 Greece Fraunhofer Institute for Applied Optics and Precision Engineering Iof Center of Excellence in Photonics Albert-Einstein-Straße 7 Jena07745 Germany

ISBN: (数字)9781510641884

ISBN: (纸本)9781510641877

Ultrafast laser welding is a fast, clean, and contactless technique for joining a broad range of materials. Nevertheless, this technique cannot be applied for bonding semiconductors and metals. By investigating the nonlinear propagation of picosecond laser pulses in silicon, it is elucidated how the evolution of filaments during propagation prevents the energy deposition at the semiconductor-metal interface. While the restrictions imposed by nonlinear propagation effects in semiconductors usually inhibit countless applications, the possibility to perform semiconductor-metal ultrafast laser welding is demonstrated. This technique relies on the determination and the precompensation of the nonlinear focal shift for relocating filaments and thus optimizing the energy deposition at the interface between the materials. The resulting welds show remarkable shear joining strengths (up to 2.2 MPa) compatible with applications in microelectronics. Material analyses shed light on the physical mechanisms involved during the interaction. © 2021 SPIE. All rights reserved.

关键词： Ultrafast lasers

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Cover Image, Volume 5, Number 3, March 2023

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Carbon Energy 2023年第3期5卷

作者： Jun Yang Xing Li Ke Qu Yixian Wang Kangqi Shen Changhuan Jiang Bo Yu Pan Luo Zhuangzhi Li Mingyang Chen Bingshu Guo Mingshan Wang Junchen Chen Zhiyuan Ma Yun Huang Zhenzhong Yang Pengcheng Liu Rong Huang Xiaodi Ren David Mitlin School of New Energy and Materials Southwest Petroleum University Chengdu China Energy Storage Research Institute Southwest Petroleum University Chengdu China Ke Qu Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China. China Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics East China Normal University Shanghai 200062 China. Mingyang Chen Beijing Computational Science Research Center Beijing 100193 China. Center for Green Innovation School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China. Rong Huang China Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics East China Normal University Shanghai 200062 China. Xiaodi Ren Hefei National Research Center for Physical Sciences at the Microscale Department of Materials Science and Engineering University of Science and Technology of China Hefei Anhui 230026 China. David Mitlin Materials Science Program and Texas Materials Institute The University of Texas at Austin Austin Texas 78712-1591 USA. Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China China Key Laboratory of Polar Materials and Devices (MOE) Department of Electronics East China Normal University Shanghai China Xing Li School of New Energy and Materials Southwest Petroleum University Chengdu China. Materials Science Program and Texas Materials Institute The University of Texas at Austin Austin Texas USA Beijing Computational Science Research Center Beijing China School of Materials Science and Engineering Center for Green Innovation University of Science and Technology Beijing Beijing China Department of Materials Science and Engineering Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei Anhui China

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