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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

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

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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Landau Polaritons in a Full-Dielectric Three-Dimensional Photonic-Crystal Cavity

Landau Polaritons in a Full-Dielectric Three-Dimensional Pho...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Fuyang Tay Ali Mojibpour Shuang Liang Andrey Baydin Arash Ahmadivand Nicolas Marquez Peraca Hongjing Xu Geoff C. Gardner Michael J. Manfra David Hagenmüller Junichiro Kono Department of Electrical and Computer Engineering Rice University Houston Texas USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas USA Department of Physics and Astronomy Purdue University West Lafayette IN USA Birck Nanotechnology Center Purdue University West Lafayette IN USA Smalley-Curl Institute Rice University Houston Texas USA Department of Physics and Astronomy Rice University Houston Texas USA Microsoft Quantum Purdue Purdue University West Lafayette IN USA School of Electrical and Computer Engineering Purdue University West Lafayette IN USA School of Materials Engineering Purdue University West Lafayette IN USA ISIS (UMR 7006) Université de Strasbourg and CNRS Strasbourg France Department of Materials Science and Nano Engineering Rice University Houston Texas USA

We fabricated a full-dielectric three-dimensional photonic-crystal cavity containing an ultrahigh-mobility two-dimensional electron gas. By applying a strong perpendicular magnetic field, we created Landau polaritons ... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Couplings HEMTs Laser modes Polaritons Magnetic fields Gas lasers MODFETs

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Effects of MXenes (Ti3C2Tx) deposition by drop casting on the fretting wear of structural concrete

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Wear 2025年 570卷

作者： Silva, Cristiane Arpino Gonçalves, Margarete R.F. Rosenkranz, Andreas Hammes, Gisele Costa, Henara Lillian Universidade Federal de Pelotas Materials Science and Engineering Graduate Program Rua Gomes Carneiro 1 Porto RS Pelotas Brazil University of Chile Department of Chemical Engineering Biotechnology and Materials Avenida Beauchef 851 Santiago Chile Universidade Federal de Santa Catarina LabMat Rua Delfino Conti s/n. Bloco B Trindade SC Florianópolis Brazil Universidade Federal do Rio Grande School of Engineering Av. Itália km 8 Bairro Carreiros RS Rio Grande Brazil

In civil engineering, concrete is the most widely used material due to the availability of its components. Research on tribology of semi-rigid structural systems is important in civil engineering, as the initially rigid contact between concrete and metallic elements can generate micromovement, resulting in wear due to fretting and possible cracks. Recently, a new family of 2D metal carbide and nitride nanosheets called MXenes has stood out in tribological applications due to their layered structure, which provides self-lubricating and reinforcing properties, but they are costly and difficult to produce in large scale, making their use in civil engineering challenging, despite encouraging results from the literature. To overcome this, the present work proposed surface deposition of MXenes by drop-casting (involving very small amounts of Mxenes) to control fretting wear between concrete and steel. One and five applications were deposited from a dispersion at a concentration of approximately 0.4 mg/mL of MXenes in isopropanol. Fretting tests were carried out on concrete (with and without MXenes deposition) against steel counterbodies for a total stroke of 200 μm under different speeds (0.2 and 2 mm/s) and times (5 and 30 min). The results showed that the friction coefficients obtained in the fretting tests did not present a statistically significant difference when using Mxenes either as a reinforcement in the concrete or deposited by drop casting. The wear rates obtained from the fretting tests demonstrated that, for the lower speed, no significant difference could be confirmed for the modified concretes in either the 5 min or the 30 min tests. On the other hand, in the condition of speed = 2 mm/s and time = 5 min, the wear rate for one application of MXenes by dropcasting was lower than the reference. With a higher speed and 30-min test, a greater effect on the wear rate occurred, which may be the result of tribochemical effects in the contact. It is clear that, in t

关键词： Concrete Drop casting Fretting MXenes

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Giant Deep-Ultraviolet Circular Dichroism in Synthetic Architectures of Ordered Carbon Nanotubes

Giant Deep-Ultraviolet Circular Dichroism in Synthetic Archi...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Jacques Doumani Minhan Lou Oliver Dewey Nina Hong Jichao Fan Andrey Baydin Matteo Pasquali Yohei Yomogida Kazuhiro Yanagi Riichiro Saito Junichiro Kono Weilu Gao Department of Electrical and Computer Engineering Rice University Houston TX USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Department of Electrical and Computer Engineering The University of Utah Salt Lake City UT USA Carbon Hub Rice University Houston TX USA Department of Chemical and Biomolecular Engineering Rice University Houston TX USA J.A. Woollam Co. Lincoln NE USA The Smalley-Curl Institute Rice University Houston TX USA Department of Chemistry Rice University Houston TX USA Department of Materials Science and NanoEngineering Rice University Houston TX USA Department of Physics and Astronomy Tokyo Metropolitan University Tokyo Japan Department Physics Tohoku University Sendai Japan Department Physics and Astronomy Rice University Houston TX USA

We demonstrate tunable, giant, and structure-induced deep-ultraviolet circular dichroism in macroscopically chiral assemblies of racemic carbon nanotubes prepared using two approaches: mechanical-rotation-assisted vac... 详细信息

ISBN: (纸本)9781957171258

关键词： Carbon nanotubes Chiral media Dichroism Graphene Optical activity Quantum information

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Room-temperature polar metal stabilized under high pressure

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Physical Review B 2020年第22期101卷 220101(R)-220101(R)页

作者： J.-J. Gao S.-Y. Fu K. Yamaura J. F. Lin J.-S. Zhou Materials Science and Engineering Program Mechanical Engineering The University of Texas at Austin Austin Texas 78712 USA Institute of Fluid Physics China Academy of Engineering Physics Mianyang 621900 China Department of Geological Sciences The University of Texas at Austin Austin Texas 78712 USA International Center for Materials Nanoarchitectronics (WPI-MANA) National Institute for Materials Science 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan Graduate School of Chemical Sciences and Engineering Hokkaido University North 10 West 8 Kita-ku Sapporo Hokkaido 060-0810 Japan

LiOsO3 synthesized under high pressure in recent years is a rare metal since it undergoes a nonpolar to polar phase transition at Ts=140K. Forming a polar axis through a phase transition in a metal seems against common sense. It is also not clear whether the transition to a polar phase in the oxide fits the mechanism predicted by Anderson and Blount in 1965. As monitored by an anomaly of resistivity in LiOsO3 at Ts reported recently, Ts increases under pressure. The structural study under high pressure could give us a useful clue for understanding how dipoles form in this metallic oxide. Here, we report the identification of a polar phase of LiOsO3 at room temperature under high pressure by using in situ probes of Raman and synchrotron x-ray diffraction. In the Raman study, the pressure-induced modes and their responses to polarized light, the linewidth change, the peak profile change, and mode softening have been directly compared with the corresponding changes of LiOsO3 on cooling through Ts at ambient pressure. Whereas a complete set of Raman modes from the R3c phase can be found at P≥15.5GPa, a Raman mode of the R3c phase appears in the R3¯c phase at 4.11 GPa. A significant drop in the linewidth occurs at 12.6 GPa that coincides with the critical pressure for the phase transition to the polar phase detected by x-ray diffraction. Fitting the peak profile of a Raman mode to the Fano formula also indicates a clear change of electron-phonon coupling at 16 GPa. In contrast to a sharp structural transition to the polar phase at Ts under ambient pressure, our results reveal all the structural ingredients to facilitate the polar phase over a broad range of pressure. A bond valence sum analysis has been introduced to reveal the local structural instability under pressure. The transition to the polar phase in metallic LiOsO3 is solely caused by optimizing the local structure in order to make the bond valence sum close to the formal valence of the Li ion.

关键词： Ferroelectricity Phase transitions Pressure effects Metals

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Correction: N-doped carbon nanoparticles on highly porous carbon nanofiber electrodes for sodium ion batteries

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RSC advances 2025年第8期15卷 6370页

作者： Meltem Yanilmaz Bülin Atıcı Jiadeng Zhu Ozan Toprakci Juran Kim Nano-Science and Nano-Engineering Program Graduate School of Science Engineering and Technology Istanbul Technical University Istanbul 34469 Turkey yanilmaz@itu.edu.tr. Textile Engineering Istanbul Technical University Istanbul 34469 Turkey. Smart Devices Brewer Science Inc. Springfield MO 65806 USA. Department of Polymer Materials Engineering Yalova University 77200 Yalova Turkey. Advanced Textile R&D Department Korea Institute of Industrial Technology (KITECH) Ansan 15588 Korea jkim0106@kitech.re.kr.

[This corrects the article DOI: 10.1039/D3RA00635B.].

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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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Correction to: Corrosion Resistant Boron-Modified Ferritic and Austenitic Stainless Steels Designed by CALPHAD

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Metallurgical and materials Transactions A 2021年第7期52卷 3190-3190页

作者： dos Santos, E. R. da Silva, W. A. Koga, G. Y. Bolfarini, C. Zepon, G. Graduate Program in Materials Science and Engineering Federal University of Sao Carlos Sao Carlos Brazil Department of Materials Engineering Federal University of Sao Carlos Sao Carlos Brazil

A correction to this paper has been published: https://***/10.1007/s11661-021-06290-w

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