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On the Study of PEM Fuel Cells by Transmission Electron Microscopy

Microscopy and Microanalysis 2016年第S3期22卷 1280-1281页

作者： S. Rasouli D. Groom K. Yu A. Godoy A. Bovik D. Myers Naotoshi Nakashima P. J. Ferreira Materials Science and Engineering Program University of Texas at Austin Austin TX Department of Electrical and Computer Engineering University of Texas at Austin Austin TX Argonne National Laboratory Argonne Illinois United States Department of Applied Chemistry Kyushu University Fukuoka Japan

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Ice Melting to Release Reactants in Solution Syntheses

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Angewandte Chemie 2018年第13期130卷

作者： Hehe Wei Kai Huang Le Zhang Binghui Ge Dong Wang Jialiang Lang Jingyuan Ma Da Wang Shuai Zhang Qunyang Li Ruoyu Zhang Naveed Hussain Ming Lei Li‐Min Liu Hui Wu State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Beijing Computational Science Research Center Beijing 100193 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China AML Department of Engineering Mechanics State Key Laboratory of Tribology Tsinghua University Beijing 100084 China State Key Laboratory of Information Photonics and Optical Communications & School of Science Beijing University of Posts and Telecommunications Beijing 100876 China School of Physics Beihang University Beijing 100191 China

Aqueous solution syntheses are mostly based on mixing two solutions with different reactants. It is shown that freezing one solution and melting it in another solution provides a new interesting strategy to mix chemicals and to significantly change the reaction kinetics and thermodynamics. For example, a precursor solution containing a certain concentration of AgNO 3 was frozen and dropped into a reductive NaBH 4 solution at about 0 °C. The ultra‐slow release of reactants was successfully achieved. An ice‐melting process can be used to synthesize atomically dispersed metals, including cobalt, nickel, copper, rhodium, ruthenium, palladium, silver, osmium, iridium, platinum, and gold, which can be easily extended to other solution syntheses (such as precipitation, hydrolysis, and displacement reactions) and provide a generalized method to redesign the interphase reaction kinetics and ion diffusion in wet chemistry.

关键词： Dispergierte Metallatome Kinetisch kontrollierte Prozesse Nukleierung Schmelzen von Eis

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Innenrücktitelbild: Ice Melting to Release Reactants in Solution Syntheses (Angew. Chem. 13/2018)

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Angewandte Chemie 2018年第13期130卷

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Inside Back Cover: Ice Melting to Release Reactants in Solution Syntheses (Angew. Chem. Int. Ed. 13/2018)

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Angewandte Chemie International Edition 2018年第13期57卷

作者： Hehe Wei Dr. Kai Huang Le Zhang Prof. Dr. Binghui Ge Dr. Dong Wang Jialiang Lang Dr. Jingyuan Ma Dr. Da Wang Shuai Zhang Prof. Dr. Qunyang Li Ruoyu Zhang Naveed Hussain Prof. Dr. Ming Lei Prof. Dr. Li-Min Liu Prof. Dr. Hui Wu State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Beijing Computational Science Research Center Beijing 100193 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China AML Department of Engineering Mechanics State Key Laboratory of Tribology Tsinghua University Beijing 100084 China State Key Laboratory of Information Photonics and Optical Communications & School of Science Beijing University of Posts and Telecommunications Beijing 100876 China School of Physics Beihang University Beijing 100191 China

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Publisher Correction: On the issue of transparency and reproducibility in nanomedicine

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Nature nanotechnology 2019年第8期14卷 811页

作者： Hon S Leong Kimberly S Butler C Jeffrey Brinker May Azzawi Steve Conlan Christine Dufès Andrew Owen Steve Rannard Chris Scott Chunying Chen Marina A Dobrovolskaia Serguei V Kozlov Adriele Prina-Mello Ruth Schmid Peter Wick Fanny Caputo Patrick Boisseau Rachael M Crist Scott E McNeil Bengt Fadeel Lang Tran Steffen Foss Hansen Nanna B Hartmann Lauge P W Clausen Lars M Skjolding Anders Baun Marlene Ågerstrand Zhen Gu Dimitrios A Lamprou Clare Hoskins Leaf Huang Wantong Song Huiliang Cao Xuanyong Liu Klaus D Jandt Wen Jiang Betty Y S Kim Korin E Wheeler Andrew J Chetwynd Iseult Lynch Sayed Moein Moghimi André Nel Tian Xia Paul S Weiss Bruno Sarmento José das Neves Hélder A Santos Luis Santos Samir Mitragotri Steve Little Dan Peer Mansoor M Amiji Maria José Alonso Alke Petri-Fink Sandor Balog Aaron Lee Barbara Drasler Barbara Rothen-Rutishauser Stefan Wilhelm Handan Acar Roger G Harrison Chuanbin Mao Priyabrata Mukherjee Rajagopal Ramesh Lacey R McNally Sara Busatto Joy Wolfram Paolo Bergese Mauro Ferrari Ronnie H Fang Liangfang Zhang Jie Zheng Chuanqi Peng Bujie Du Mengxiao Yu Danielle M Charron Gang Zheng Chiara Pastore Department of Urology Mayo Clinic Rochester MN USA. Department of Physiology and Biomedical Engineering Mayo Clinic Rochester MN USA. Department of Nanobiology Sandia National Laboratories Albuquerque NM USA. Center for Micro-Engineered Materials University of New Mexico Albuquerque Albuquerque NM USA. Departments of Chemical and Biological Engineering University of New Mexico Albuquerque NM USA. Department of Molecular Genetics and Microbiology University of New Mexico Albuquerque NM USA. UNM Comprehensive Cancer Center University of New Mexico Albuquerque NM USA. Cardiovascular Research Group School of Healthcare Science Manchester Metropolitan University Manchester UK. British Society for Nanomedicine Liverpool UK. Institute of Life Science Swansea University Medical School Swansea University Swansea UK. Strathclyde Institute of Pharmacy and Biomedical Sciences University of Strathclyde Glasgow UK. Department of Molecular and Clinical Pharmacology Institute of Translational Medicine University of Liverpool Liverpool UK. Department of Chemistry School of Physical Sciences University of Liverpool Liverpool UK. Centre for Cancer Research and Cell Biology Queen's University of Belfast Belfast UK. National Center for Nanoscience and Technology of China Beijing China. Cancer Research Technology Program Nanotechnology Characterization Laboratory Frederick National Laboratory for Cancer Research Frederick MD USA. Laboratory of Animal Sciences Program Center for Advanced Preclinical Research Frederick National Laboratory for Cancer Research Frederick National Laboratory for Cancer Research Frederick MD USA. Trinity Translational Medicine Institute Department of Clinical Medicine Trinity College Dublin Dublin Ireland. Laboratory for Biological Characterisation of Advanced Materials Trinity Translational Medicine Institute Trinity College Dublin Dublin Ireland. Nanomedicine Group Advanced Materials and Bioengineering Research (AMBER) centre Centre

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Reconstruction of the Nanoscale Three-Dimensional Mass-Density Autocorrelation Function of Individual Cells

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Microscopy and Microanalysis 2016年第S3期22卷 918-919页

作者： Y. Li D. Zhang I. Capoglu D. Damania K. Hujsak L. Cherkezyan E. Roth R. Bleher J. Wu H. Subramanian Applied Physics Program Northwestern University Evanston Illinois USA Department of Biomedical Engineering Northwestern University Evanston Illinois USA Department of Materials Science and Engineering Northwestern University Evanston Illinois USA Chemistry of Life Processes Institute Northwestern University Evanston Illinois

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Packing in protein cores

arXiv

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arXiv 2017年

作者： Gaines, J.C. Clark, A.H. Regan, L. O'Hern, C.S. Program in Computational Biology and Bioinformatics Yale University New HavenCT06520 United States Yale University New HavenCT06520 United States Department of Mechanical Engineering & Materials Science Yale University New HavenCT06520 United States Department of Molecular Biophysics & Biochemistry Yale University New HavenCT06520 United States Department of Chemistry Yale University New HavenCT06520 United States Department of Physics Yale University New HavenCT06520 United States Department of Applied Physics Yale University New HavenCT06520 United States

Proteins are biological polymers that underlie all cellular functions. The first high-resolution protein structures were determined by x-ray crystallography in the 1960s. Since then, there has been continued interest in understanding and predicting protein structure and stability. It is well-established that a large contribution to protein stability originates from the sequestration from solvent of hydrophobic residues in the protein core. How are such hydrophobic residues arranged in the core? And how can one best model the packing of these residues? Here we show that to properly model the packing of residues in protein cores it is essential that amino acids are represented by appropriately calibrated atom sizes, and that hydrogen atoms are explicitly included. We show that protein cores possess a packing fraction of φ ≈ 0.56, which is significantly less than the typically quoted value of 0.74 obtained using the extended atom representation. We also compare the results for the packing of amino acids in protein cores to results obtained for jammed packings from disrete element simulations composed of spheres, elongated particles, and particles with bumpy surfaces. We show that amino acids in protein cores pack as densely as disordered jammed packings of particles with similar values for the aspect ratio and bumpiness as found for amino acids. Knowing the structural properties of protein cores is of both fundamental and practical importance. Practically, it enables the assessment of changes in the structure and stability of proteins arising from amino acid mutations (such as those identified as a result of the massive human genome sequencing efforts) and the design of new folded, stable proteins and protein-protein interactions with tunable specificity and affinity. Copyright © 2017, The Authors. All rights reserved.

关键词： Proteins

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Anomalous friction of graphene nanoribbons on waved graphenes

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Theoretical & applied mechanics Letters 2015年第6期5卷 212-215页

作者： Jun Fang Bin Chen Hui Pan Department of Engineering Mechanics Zhejiang University Institute of Applied Physics and Materials Engineering Faculty of Science and Technology University of Macao

Friction plays a critical role in the function and maintenance of small-scale structures, where the conventional Coulomb friction law often fails. To probe the friction at small scales, here we present a molecular dynamics study on the process of dragging graphene nanoribbons on waved graphene substrates. The simulation shows that the induced friction on graphene with zero waviness is ultra-low and closely related to the surface energy barrier. On waved graphenes, the friction generally increases with the amplitude of the wave at a fixed period, but anomalously increases and then decreases with the period at a fixed amplitude. These findings provide the insights into the ultraqow friction at small scales, as well as some guidelines into the fabrication ofgraphene-based nano-composites with high performance.

关键词： Friction Small scale Graphene Molecular dynamics

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Nonlinear all-optical switch based on a white-light cavity

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Physical Review A 2016年第4期93卷 043819-043819页

作者： Na Li Jingping Xu Ge Song Chengjie Zhu Shuangyuan Xie Yaping Yang M. Suhail Zubairy Shi-Yao Zhu MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and Engineering Tongji University Shanghai 200092 People's Republic of China Beijing Computational Science Research Center Beijing 100084 People's Republic of China School of Aerospace Engineering and Applied Mechanics Tongji University Shanghai 200092 People's Republic of China Institute of Quantum Science and Engineering (IQSE) and Department of Physics and Astronomy Texas A&M University College Station Texas 77843-4242 USA

It is well known that there is a bottleneck for nonlinear all-optical switching, namely, the switching power and the switching time cannot be lowered simultaneously. A lower switching power requires a resonator with a high quality (Q) factor, but leads to a longer switching time. We propose to overcome this bottleneck by replacing the nonlinear cavity in such an all-optical switch by a white-light cavity. This can be done by doping three-level atoms in the ring resonator and applying incoherent pump and coherent driving fields on it. The white-light cavity possesses broadband resonance in a linear region. Therefore, for the incident pulse, a broad range of frequency components can take part in the nonlinear process, and so it requires lower power to achieve switching compared to the conventional ring resonator. On the other hand, the refractive index of a white-light cavity has negative dispersion, leading to a fast group velocity. This results in a shorter time to build up the resonant response, yielding a short switching time.

关键词： Integrated optics Optical materials & elements

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Epitaxial growth following crystal nucleation in laser-quenched Si filins on SiO2

Epitaxial growth following crystal nucleation in laser-quenc...

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2015 MRS Spring Meeting

作者： Wong, Vemon K. Chitu, A.M. Limanov, A.B. Im, James S. Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New YorkNY United States

ISBN: (纸本)9781510826267

We have investigated the solidified microstructure of nucleation-generated grains obtained via complete melting of Si films on SiO2 at high nucleation temperatures. This was achieved using a high-temperature-capable hot stage in conjunction with excimer laser irradiation. As predicted by the direct-growth model that considers (1) the evolution in the temperature of the solidifying interface and (2) the subsequent modes of growth (consisting of amorphous, defective, and epitaxial) as key factors, we were able to observe the appearance of "normal" grains that possess a single-crystal core area. These grains, which are in contrast to previously reported flower-shaped grains that fully make up the microstructure of the solidified films obtained via irradiation at lower preheating temperatures (and amongst which these "normal" grains emerge), indicate that epitaxial growth of nucleated crystals must have taken place within the grains. We discuss the implications of our findings regarding (1) the validity of the direct-growth model, (2) the nature of the heterogeneous nucleation mechanism, and (3) the alternative explanations and assumptions that have been previously employed in order to explain the microstructure of Si films obtained via nucleation and growth within the complete melting regime. © 2015 materials Research Society.

关键词： Silica

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