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Genetically Encoded and Biologically Produced All-DNA Nanomedicine Based on One-Pot Assembly of DNA Dendrimers for Targeted Gene Regulation

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Angewandte Chemie 2020年第10期133卷

作者： Dr. Jingxiong Lu Dr. Pengchao Hu Dr. Lingyan Cao Zixiang Wei Fan Xiao Dr. Zhe Chen Prof. Yan Li Prof. Leilei Tian Department of Materials Science and Engineering Southern University of Science and Technology 1088 Xueyuan Blvd. Nanshan District Shenzhen Guangdong 518055 China Institute of Medi-X Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology 1088 Xueyuan Blvd. Nanshan District Shenzhen Guangdong 518055 China Department of Biology Southern University of Science and Technology 1088 Xueyuan Blvd. Nanshan District Shenzhen Guangdong 518055 China Department of Prosthodontics Ninth People's Hospital Shanghai Jiao Tong University School of Medicine 639 Zhizaoju Road Shanghai 200011 China

All-DNA nanomedicines have emerged as potential anti-tumor drugs. DNA nanotechnology provides all-DNA nanomedicines with unlimited possibilities in controlling the diversification of size, shape, and loads of the therapeutic motifs. As DNA is a biological polymer, it is possible to genetically encode and produce the all-DNA nanomedicines in living bacteria. Herein, DNA-dendrimer-based nanomedicines are designed to adapt to the biological production, which is constructed by the flexible 3-arm building blocks to enable a highly efficient one-pot DNA assembly. For the first time, a DNA nanomedicine, D4-3-As-DzSur, is successfully genetically encoded, biotechnologically produced, and directly self-assembled. The performance of the biologically produced D4-3-As-DzSur in targeted gene regulation has been confirmed by in vitro and in vivo studies. The biological production capability will fulfill the low-cost and large-scale production of all-DNA nanomedicines and promote clinical applications.

关键词： all-DNA nanomedicine biological production DNA dendrimers gene regulation genetic encoding

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Photoemission spectroscopic evidence for the dirac nodal line in monoclinic semimetal SrAs3

arXiv

引用

arXiv 2019年

作者： Song, Y.K. Wang, G.W. Li, S.C. Liu, W.L. Lu, X.L. Liu, Z.T. Li, Z.J. Wen, J.S. Yin, Z.P. Liu, Z.H. Shen, D.W. State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China School of Physical Science and Technology ShanghaiTech University Shanghai200031 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Department of Physics Center for Advanced Quantum Studies Beijing Normal University Beijing100875 China National Laboratory of Solid State Microstructures Department of Physics Nanjing University Nanjing210093 China University of Chinese Academy of Sciences Beijing100049 China Shanghai200050 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

Topological nodal-line semimetals with exotic quantum properties are characterized by symmetry-protected line-contact bulk band crossings in the momentum space. However, in most of identified topological nodalline compounds, these topological non-trivial nodal lines are enclosed by complicated topological trivial states at the Fermi energy (EF), which would perplex their identification and hinder further applications. Utilizing angle-resolved photoemission spectroscopy and first-principles calculations, we provide compelling evidence for the existence of Dirac nodal-line fermions in the monoclinic semimetal SrAs3, which are close to EFand away from distraction of complex trivial Fermi surfaces or surface states. Our calculation indicates that two bands with opposite parity are inverted around Y near EF, which results in the single nodal loop at the G-YS plane with a negligible spin-orbit coupling effect. We track these band crossings and then unambiguously identify the complete nodal loop quantitatively, which provides a critical experimental support to the prediction of nodal-line fermions in the CaP3family of materials. Hosting simple topological non-trivial bulk electronic states around EFand no interfering with surface states on the natural cleavage plane, SrAs3is expected to be a potential platform for topological quantum state investigation and applications. Copyright © 2019, The Authors. All rights reserved.

关键词： Surface states

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The PLATO mission

引用

Experimental Astronomy 2025年第3期59卷 1-111页

作者： Rauer, Heike Aerts, Conny Cabrera, Juan Deleuil, Magali Erikson, Anders Gizon, Laurent Goupil, Mariejo Heras, Ana Walloschek, Thomas Lorenzo-Alvarez, Jose Marliani, Filippo Martin-Garcia, César Mas-Hesse, J. Miguel O’Rourke, Laurence Osborn, Hugh Pagano, Isabella Piotto, Giampaolo Pollacco, Don Ragazzoni, Roberto Ramsay, Gavin Udry, Stéphane Appourchaux, Thierry Benz, Willy Brandeker, Alexis Güdel, Manuel Janot-Pacheco, Eduardo Kabath, Petr Kjeldsen, Hans Min, Michiel Santos, Nuno Smith, Alexis Suarez, Juan-Carlos Werner, Stephanie C. Aboudan, Alessio Abreu, Manuel Acuña, Lorena Adams, Moritz Adibekyan, Vardan Affer, Laura Agneray, François Agnor, Craig Aguirre Børsen-Koch, Victor Ahmed, Saad Aigrain, Suzanne Al-Bahlawan, Ashraf Alcacera Gil, Ma de los Angeles Alei, Eleonora Alencar, Silvia Alexander, Richard Alfonso-Garzón, Julia Alibert, Yann Allende Prieto, Carlos Almeida, Leonardo Alonso Sobrino, Roi Altavilla, Giuseppe Althaus, Christian Alvarez Trujillo, Luis Alonso Amarsi, Anish Ammler-von Eiff, Matthias Amôres, Eduardo Andrade, Laerte Antoniadis-Karnavas, Alexandros António, Carlos Aparicio del Moral, Beatriz Appolloni, Matteo Arena, Claudio Armstrong, David Aroca Aliaga, Jose Asplund, Martin Audenaert, Jeroen Auricchio, Natalia Avelino, Pedro Baeke, Ann Baillié, Kevin Balado, Ana Ballber Balagueró, Pau Balestra, Andrea Ball, Warrick Ballans, Herve Ballot, Jerome Barban, Caroline Barbary, Gaële Barbieri, Mauro Barceló Forteza, Sebastià Barker, Adrian Barklem, Paul Barnes, Sydney Barrado Navascues, David Barragan, Oscar Baruteau, Clément Basu, Sarbani Baudin, Frederic Baumeister, Philipp Bayliss, Daniel Bazot, Michael Beck, Paul G. Belkacem, Kevin Bellinger, Earl Benatti, Serena Benomar, Othman Bérard, Diane Bergemann, Maria Bergomi, Maria Bernardo, Pierre Biazzo, Katia Bignamini, Andrea Bigot, Lionel Billot, Nicolas Binet, Martin Biondi, David Biondi, Federico Birch, Aaron C. Bitsch, Bertram Bluhm Ceballos, Paz Victoria Bódi, Attila Bognár, Zsófia Boisse, Isabelle Bolmont, Emeline Bonanno, Alfio Bonavita, Institut für Planetenforschung Deutsches Zentrum für Luft- und Raumfahrt DLR Rutherfordstrasse 2 Berlin 12489 Germany Fachbereich Geowissenschaften Institut für Geologische Freie Universität Berlin Malteserstr. 74-100 Berlin 12249 Germany Institute of Astronomy KU Leuven Leuven Belgium CNRS CNES LAM Aix Marseille University Marseille France Max Planck Institute for Solar System Research Göttingen Germany LESIA Paris Observatory PSL University Sorbonne University Paris Cité University CNRS Meudon France ESTEC European Space Agency Noordwijk Netherlands ESAC European Space Agency Madrid Spain Centro de Astrobiología CSIC-INTA Campus ESAC Madrid Spain Center for Space and Habitability University of Bern Bern Switzerland INAF - Osservatorio Astrofisico di Catania Catania Italy Department of Physics and Astronomy University of Padua Padua Italy Department of Physics University of Warwick Coventry United Kingdom Astronomical Observatory of Padova INAF - Italian National Institute for Astrophysics Padua Italy Armagh Observatory and Planetarium College Hill Armagh United Kingdom Geneve Observatory University of Geneve Geneve Switzerland IAS University of Paris-Saclay Orsay France AlbaNove University Centre Stockholm University Stockholm Sweden Department of Astrophysics University of Vienna Vienna Austria Department of Astronomy University of Sao Paulo Sao Paulo Brazil Astronomical Institute of the Czech Academy of Sciences Ondřejov Czech Republic Department of Physics and Astronomy Aarhus University Aarhus Denmark Institute for Space Research SRON Leiden Netherlands Instituto de Astrofísica e Ciências do Espaço CAUP Universidade do Porto Porto Portugal Departamento de Física e Astronomia Faculdade da Ci ncias Universidade do Porto Porto Portugal Mullard Space Science Laboratory University College London Holmbury Saint Mary United Kingdom Dept. Theoretical Physics and the Cosmos University of Granada Granada Spain Centre for Plan

PLATO (PLAnetary Transits and Oscillations of stars) is ESA’s M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large number of stars. PLATO will detect small planets (down to <2REarth) around bright stars (<11 mag), including terrestrial planets in the habitable zone of solar-like stars. With the complement of radial velocity observations from the ground, planets will be characterised for their radius, mass, and age with high accuracy (5%, 10%, 10% for an Earth-Sun combination respectively). PLATO will provide us with a large-scale catalogue of well-characterised small planets up to intermediate orbital periods, relevant for a meaningful comparison to planet formation theories and to better understand planet evolution. It will make possible comparative exoplanetology to place our Solar System planets in a broader context. In parallel, PLATO will study (host) stars using asteroseismology, allowing us to determine the stellar properties with high accuracy, substantially enhancing our knowledge of stellar structure and evolution. The payload instrument consists of 26 cameras with 12cm aperture each. For at least four years, the mission will perform high-precision photometric measurements. Here we review the science objectives, present PLATO‘s target samples and fields, provide an overview of expected core science performance as well as a description of the instrument and the mission profile towards the end of the serial production of the flight cameras. PLATO is scheduled for a launch date end 2026. This overview therefore provides a summary of the mission to the community in preparation of the upcoming operational phases. © The Author(s) 2025.

关键词： Asteroseismology Exoplanets PLATO mission

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Dispersion forces stabilise ice coatings at certain gas hydrate interfaces which prevent water wetting

arXiv

引用

arXiv 2019年

作者： Boström, M. Corkery, R. Lima, E.R.A. Malyi, O.I. Buhmann, S.Y. Persson, C. Brevik, I. Parsons, D.F. Fiedler, J. Department of Energy and Process Engineering Norwegian University of Science and Technology TrondheimNO-7491 Norway Programa de Pós-graduação em Engenharia Química Universidade do Estado do Rio de Janeiro Rio de Janeiro RJCEP 20550-013 Brazil Surface and Corrosion Science Department of Chemistry KTH Royal Institute of Technology StockholmSE 100 44 Sweden Centre for Materials Science and Nanotechnology Department of Physics University of Oslo P. O. Box 1048 Blindern OsloNO-0316 Norway Physikalisches Institut Albert-Ludwigs-Universität Freiburg Hermann-Herder-Str. 3 Freiburg79104 Germany School of Engineering IT Murdoch University 90 South St MurdochWA6150 Australia Centre for Materials Science and Nanotechnology Department of Physics University of Oslo P. O. Box 1048 Blindern OsloNO-0316 Norway Applied Physical Chemistry KTH Royal Institute of Technology StockholmSE 100 44 Sweden Freiburg Institute for Advanced Studies Albert-Ludwigs-Universität Freiburg Albertstr. 19 Freiburg79104 Germany Centre for Materials Science and Nanotechnology Department of Physics University of Oslo P. O. Box 1048 Blindern OsloNO-0316 Norway

Gas hydrates formed in oceans and permafrost occur in vast quantities on Earth representing both a massive potential fuel source and a large threat in climate forecasts. They have been predicted to be important on other bodies in our solar systems such as Enceladus, a moon of Saturn. CO2-hydrates likely drive the massive gas-rich water plumes seen and sampled by the spacecraft Cassini, and the source of these hydrates is thought to be due to buoyant gas hydrate particles. Dispersion forces cause gas hydrates to be coated in a 3-4 nm thick film of ice, or to contact water directly, depending on which gas they contain. These films are shown to significantly alter the properties of the gas hydrate clusters, for example, whether they float or sink. It is also expected to influence gas hydrate growth and gas leakage. Copyright © 2019, The Authors. All rights reserved.

关键词： Gas hydrates

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GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo during the Second Part of the Third Observing Run

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Physical Review X 2023年第4期13卷 041039-041039页

作者： R. Abbott T. D. Abbott F. Acernese K. Ackley C. Adams N. Adhikari R. X. Adhikari V. B. Adya C. Affeldt D. Agarwal M. Agathos K. Agatsuma N. Aggarwal O. D. Aguiar L. Aiello A. Ain P. Ajith S. Akcay T. Akutsu S. Albanesi A. Allocca P. A. Altin A. Amato C. Anand S. Anand A. Ananyeva S. B. Anderson W. G. Anderson M. Ando T. Andrade N. Andres T. Andrić S. V. Angelova S. Ansoldi J. M. Antelis S. Antier S. Appert Koji Arai Koya Arai Y. Arai S. Araki A. Araya M. C. Araya J. S. Areeda M. Arène N. Aritomi N. Arnaud M. Arogeti S. M. Aronson K. G. Arun H. Asada Y. Asali G. Ashton Y. Aso M. Assiduo S. M. Aston P. Astone F. Aubin C. Austin S. Babak F. Badaracco M. K. M. Bader C. Badger S. Bae Y. Bae A. M. Baer S. Bagnasco Y. Bai L. Baiotti J. Baird R. Bajpai M. Ball G. Ballardin S. W. Ballmer A. Balsamo G. Baltus S. Banagiri D. Bankar J. C. Barayoga C. Barbieri B. C. Barish D. Barker P. Barneo F. Barone B. Barr L. Barsotti M. Barsuglia D. Barta J. Bartlett M. A. Barton I. Bartos R. Bassiri A. Basti M. Bawaj J. C. Bayley A. C. Baylor M. Bazzan B. Bécsy V. M. Bedakihale M. Bejger I. Belahcene V. Benedetto D. Beniwal T. F. Bennett J. D. Bentley M. BenYaala F. Bergamin B. K. Berger S. Bernuzzi C. P. L. Berry D. Bersanetti A. Bertolini J. Betzwieser D. Beveridge R. Bhandare U. Bhardwaj D. Bhattacharjee S. Bhaumik I. A. Bilenko G. Billingsley S. Bini R. Birney O. Birnholtz S. Biscans M. Bischi S. Biscoveanu A. Bisht B. Biswas M. Bitossi M.-A. Bizouard J. K. Blackburn C. D. Blair D. G. Blair R. M. Blair F. Bobba N. Bode M. Boer G. Bogaert M. Boldrini L. D. Bonavena F. Bondu E. Bonilla R. Bonnand P. Booker B. A. Boom R. Bork V. Boschi N. Bose S. Bose V. Bossilkov V. Boudart Y. Bouffanais A. Bozzi C. Bradaschia P. R. Brady A. Bramley A. Branch M. Branchesi J. Brandt J. E. Brau M. Breschi T. Briant J. H. Briggs A. Brillet M. Brinkmann P. Brockill A. F. Brooks J. Brooks D. D. Brown S. Brunett G. Bruno R. Bruntz J. Bryant T. Bulik H. J. Bulten A. Buonanno R. Buscicchio D. Buskulic C. Buy R. L. Byer G. S. Cabourn Davies L. Cadonati G. Cagn LIGO Laboratory California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy OzGrav School of Physics & Astronomy Monash University Clayton 3800 Victoria Australia LIGO Livingston Observatory Livingston Louisiana 70754 USA University of Wisconsin-Milwaukee Milwaukee Wisconsin 53201 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany Inter-University Centre for Astronomy and Astrophysics Pune 411007 India University of Cambridge Cambridge CB2 1TN United Kingdom Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena D-07743 Jena Germany University of Birmingham Birmingham B15 2TT United Kingdom Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) Northwestern University Evanston Illinois 60208 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gravity Exploration Institute Cardiff University Cardiff CF24 3AA United Kingdom INFN Sezione di Pisa I-56127 Pisa Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India University College Dublin Dublin 4 Ireland Gravitational Wave Science Project National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan INFN Sezione di Torino I-10125 Torino Italy Università di Napoli “Federico II” Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy Université de Lyon Université Claude Bernard Lyon 1 CNRS Institut L

The third Gravitational-Wave Transient Catalog (GWTC-3) describes signals detected with Advanced LIGO and Advanced Virgo up to the end of their third observing run. Updating the previous GWTC-2.1, we present candidate gravitational waves from compact binary coalescences during the second half of the third observing run (O3b) between 1 November 2019, 15∶00 Coordinated Universal Time (UTC) and 27 March 2020, 17∶00 UTC. There are 35 compact binary coalescence candidates identified by at least one of our search algorithms with a probability of astrophysical origin pastro>0.5. Of these, 18 were previously reported as low-latency public alerts, and 17 are reported here for the first time. Based upon estimates for the component masses, our O3b candidates with pastro>0.5 are consistent with gravitational-wave signals from binary black holes or neutron-star–black-hole binaries, and we identify none from binary neutron stars. However, from the gravitational-wave data alone, we are not able to measure matter effects that distinguish whether the binary components are neutron stars or black holes. The range of inferred component masses is similar to that found with previous catalogs, but the O3b candidates include the first confident observations of neutron-star–black-hole binaries. Including the 35 candidates from O3b in addition to those from GWTC-2.1, GWTC-3 contains 90 candidates found by our analysis with pastro>0.5 across the first three observing runs. These observations of compact binary coalescences present an unprecedented view of the properties of black holes and neutron stars.

关键词： Gravitational waves

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Demonstration of weak measurements, projective measurements, and quantum-to-classical transitions in ultrafast free electron-photon interactions

arXiv

引用

arXiv 2019年

作者： Pan, Yiming Cohen, Eliahu Karimi, Ebrahim Gover, Avraham Schönenberger, Norbert Chlouba, Tomáš Wang, Kangpeng Nehemia, Saar Hommelhoff, Peter Kaminer, Ido Aharonov, Yakir Department of Physics of Complex Systems Weizmann Institute of Science Rehovot7610001 Israel Faculty of Engineering The Institute of Nanotechnology and Advanced Materials Bar Ilan University Ramat Gan5290002 Israel Department of Physics University of Ottawa OttawaONK1N 6N5 Canada Department of Electrical Engineering Physical Electronics Tel Aviv University Ramat Aviv 6997801 Israel Staudtstraße 1 Erlangen91058 Germany Department of Electrical Engineering Technion Haifa3200003 Israel School of Physics and Astronomy Tel Aviv University Ramat Aviv 6997801 Israel Institute for Quantum Studies Chapman University OrangeCA92866 United States

How does the quantum-to-classical transition of measurement occur? This question is vital for both foundations and applications of quantum mechanics. Here, we develop a new measurement-based framework for characterizing the classical and quantum free electron-photon interactions and then experimentally test it. We first analyze the transition from projective to weak measurement in generic light-matter interactions and show that any classical electron-laser-beam interaction can be represented as an outcome of a weak measurement. In particular, the appearance of classical point-particle acceleration is an example of an amplified weak value resulting from weak measurement. A universal factor,exp(−Γ!/2), quantifies the measurement regimes and their transition from quantum to classical, where Γ corresponds to the ratio between the electron wavepacket size and the optical wavelength. This measurement-based formulation is experimentally verified in both limits of photon-induced near-field electron microscopy and the classical acceleration regime using a dielectric laser accelerator. Our results shed new light on the transition from quantum to classical electrodynamics, enabling to employ the essence of wave-particle duality of both light and electrons in quantum measurement for exploring and applying many quantum and classical light-matter interactions. Copyright © 2019, The Authors. All rights reserved.

关键词： Electrons

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Giant thermal Hall conductivity from neutral excitations in the pseudogap phase of cuprates

arXiv

引用

arXiv 2019年

作者： Grissonnanche, G. Legros, A. Badoux, S. Lefrançois, E. Zatko, V. Lizaire, M. Laliberté, F. Gourgout, A. Zhou, J.-S. Pyon, S. Takayama, T. Takagi, H. Ono, S. Doiron-Leyraud, N. Taillefer, L. Institut quantique Département de physique & RQMP Université de Sherbrooke SherbrookeQCJ1K 2R1 Canada SPEC CEA CNRS-UMR3680 Université Paris-Saclay Gif-sur-Yvette Cedex91191 France Materials Science and Engineering Program Mechanical Engineering University of Texas at Austin AustinTX78712 United States Department of Advanced Materials University of Tokyo Kashiwa277-8561 Japan Central Research Institute of Electric Power Industry Kanagawa240-0196 Japan Canadian Institute for Advanced Research TorontoONM5G 1Z8 Canada

The nature of the pseudogap phase of cuprates remains a major puzzle. Although there are indications that this phase breaks various symmetries, there is no consensus on its fundamental nature1. Although Fermi-surface2, transport3 and thermodynamic4 signatures of the pseudogap phase are reminiscent of a transition into a phase with antiferromagnetic order5,6, there is no evidence for an associated long-range magnetic order. Here we report measurements of the thermal Hall conductivity κxy in the normal state of four different cuprates (La1.6-xNd0.4SrxCuO4, La1.8-xEu0.2SrxCuO4, La2-xSrxCuO4, and Bi2Sr2-xLaxCuO6+δ) and show that a large negative κxy signal is a property of the pseudogap phase, appearing with the onset of that phase at the critical doping p*. Since it is not due to charge carriers – as it persists when the material becomes an insulator, at low doping – or magnons – as it exists in the absence of magnetic order – or phonons – since skew scattering is very weak, we attribute this κxy signal to exotic neutral excitations, presumably with spin chirality7. The thermal Hall conductivity in the pseudogap phase of cuprates is reminiscent of that found in insulators with spin-liquid states8,9,10. In the Mott insulator La2CuO4, it attains the highest known magnitude of any insulator11. Copyright © 2019, The Authors. All rights reserved.

关键词： Copper compounds

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Biredox Eutectic Electrolytes Derived from Organic Redox‐Active Molecules: High‐Energy Storage Systems

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Angewandte Chemie 2019年第21期131卷

作者： Changkun Zhang Yumin Qian Yu Ding Leyuan Zhang Xuelin Guo Yu Zhao Guihua Yu Materials Science and Engineering Program and Department of Mechanical Engineering The University of Texas at Austin Austin TX 78712 USA Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University 199 Renai Road Suzhou Jiangsu 215123 China

One promising candidate for high‐energy storage systems is the nonaqueous redox flow battery (NARFB). However, their application is limited by low solubility of redox‐active materials and poor performance at high current density. Reported here is a new strategy, a biredox eutectic, as the sole electrolyte for NARFB to achieve a significantly higher concentration of redox‐active materials and enhance the cell performance. Without other auxiliary solvents, the biredox eutectic electrolyte is formed directly by the molecular interactions between two different redox‐active molecules. Such a unique electrolyte possesses high concentration with low viscosity (3.5 m , for N ‐butylphthalimide and 1,1‐dimethylferrocene system) and a relatively high working voltage of 1.8 V, enabling high capacity and energy density of NARFB. The resulting high‐performance NARFB demonstrates that the biredox eutectic based strategy is potentially promising for low‐cost and high‐energy storage systems.

关键词： Batterien Elektrolyte Energiespeicherung Redoxchemie Wasserstoffbrücken

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Atomic-environment-dependent thickness of ferroelastic domain walls

arXiv

引用

arXiv 2019年

作者： Li, Mingqiang Li, Xiaomei Li, Yuehui Liu, Heng-Jui Chu, Ying-Hao Gao, Peng School of Physics and International Center for Quantum Materials Peking University Electron Microscopy Laboratory Beijing100871 China Peking University Academy for Advanced Interdisciplinary Studies Beijing100871 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Department of Materials Science and Engineering National Chung Hsing University Taichung40227 ROC Taiwan Institute of Physics Academia Sinica Taipei11529 ROC Taiwan Collaborative Innovation Centre of Quantum Matter Beijing100871 China

Domain walls are of increasing interest in ferroelectrics because of their unique properties and potential applications in future nanoelectronics. However, the thickness of ferroelastic domain walls remains elusive due to the challenges in experimental characterization. Here, we determine the atomic structure of ferroelastic domain walls and precisely measure the polarization and domain wall thickness at picometer scale using annular bright field imaging in an aberration-corrected scanning transmission electron microscope. We find that the domain wall thickness in PbZr0.2Ti0.8O3 and PbTiO3 thin films is typically about one-unit cell, across which the oxygen octahedron distortion behavior is in excellent agreement with first principles calculations. Remarkably, wider domain walls about two-unit cells in thickness are also observed for those domains walls are coupled with dislocations and underwent a compressive strain. These results suggest that the thickness of ferroelastic domain walls highly depends on their atomic environments. This study can help us to understand the past debatable experimental results and provide further insights into control of domain walls via strain engineering for their possible applications in nanoelectronics. Copyright © 2019, The Authors. All rights reserved.

关键词： Polarization

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New method for modeling the topographical property of metals and its application in robot laser hardening with overlapping

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IOP Conference Series: materials science and engineering 2019年第1期659卷

作者： M Babic G Lesiuk L Giorgini Faculty of Information Studies 8000 Novo Mesto Slovenia Department of Mechanics Materials Science and Engineering Wroclaw University of Science and Technology 50-370 Wroclaw Poland Department of Industrial Chemistry University of Bologna 40136 Bologna Italy

Robot laser surface hardening is the part necessary for hardening instantly absorbs light energy, turning it into thermodynamic, due to which the temperature rises and austenite forms, then, after instant cooling, the martensite microsubstance is obtained. Due to the technology of heat treatment, it is possible to obtain other high-strength layers. The combination of laser hardening technology with the advantages of high cooling rate, uniform temperature distribution, minimum thermal stress, high strength, wide processing capabilities of various parts, etc. made this machine advanced in the processing of molding tools. In the laser a flat semiconductor is used as a heat source. The laser, in turn, has a high photoelectric conversion efficiency, has a short wavelength, low energy consumption and other advantages. In this article, we present the technology of robot laser hardening with overlapping and new method for predicting the topographical property of overlapping hardening process.

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