检索结果-内蒙古大学图书馆

Demonstration of higher-order topological States in photonic kagome lattice with next-nearest-neighbour coupling

AIP Conference Proceedings 2020年第1期2300卷

作者： D. Zhirihin M. Li M. Gorlach X. Ni D. Filonov A. Slobozhanyuk A. Alu A. B. Khanikaev 1Department of Electrical Engineering Grove School of Engineering 160 Covent Avenue City College of New York 10031 NY USA 2Department of Physics and Engineering ITMO University 49 Kronverksky Pr. 197101 St. Petersburg Russia 3Physics Program Graduate Center of the City University of New York 365 5th Avenue 10016 New York NY USA 4Center for Photonics and 2D Materials Moscow Institute of Physics and Technology Dolgoprudny 141700 Russia 5Photonics Initiative Advanced Science Research Center City University of New York 10031 New York NY USA

In this paper, we investigate topological states in a two-dimensional distorted Kagome lattice with next- nearest-neighbour (NNN) coupling. We show that introducing NNN coupling leads to the emergence of a new type of higher-order corner states in a non-trivial topological phase. Using near-field scanning technique, we verify our theoretical predictions in the microwave frequency range and demonstrate field profiles for both conventional and new type of corner states. The experimental results are in perfect agreement with numerical simulations of finite structure.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Evaluation of ionic liquid treated sisal (agave sisalana) fiber as sorbent in biodiesel spill

引用

IOP Conference Series: materials science and engineering 2018年第1期348卷

作者： E Costa A Silva S Mattedi Graduate Program in Chemical Engineering Federal University of Bahia Salvador Bahia Brazil Materials Science and Engineering Department Federal University of Bahia Salvador Bahia Brazil

The global economic development continually demands the use of energy resources, among which various types of oils are widely used. Despite their undeniable economic importance, environmental accidents with these occur frequently. Thus, the search for efficient and low-cost mitigating measures is recurrent. In this context, techniques that use natural adsorbents, such as vegetable fibers, have been studied, since they combine efficiency, selectivity, low cost and sustainability. Studies have been carried out using various types of fibers, natural or chemically treated. The interest in treating the fiber lies in the fact that, changing the chemical structure of the fiber, its oil sorption capacity is increased. Due to the offered advantages, an alternative and promising type of surface treatment using ionic liquids was performed, to the detriment of traditional treatments. Thus, the technical feasibility of the use of sisal fiber treated with ionic liquid for adsorption of biodiesel was studied.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Modification of Clay Crystal Structure with Different Alcohols

引用

Natural Resources 2017年第11期8卷 709-715页

作者： M. Ozgur Seydibeyoglu Sibel Demiroglu Metehan Atagur Selmin Yanar Ocaktan Department of Materials Science and Engineering Izmir Katip Celebi University Izmir Turkey Nanotechnology Graduate Program Izmir Katip Celebi University Izmir Turkey DYO Paint Company Izmir Turkey

Clays attract attention as a nano size material to reinforce the polymers and resins. In this study, montmorillonite clay was modified using industrial solvents that are used in the paint industry. It was shown that the water contact angle could be varied from 20? to 140? which is a real influence for the clay mineral. X-ray diffraction analysis shows that planar basal space could be altered significantly from 12.57 to 15.40 nm showing 22.5% increase in the interlayer spacing and that is really critical for many polymers and coating applications. This study will highlight many new clay nanocomposites and the formation of various clay nanocomposites.

关键词： Clay Solvent X-Ray Diffraction Water Contact Angle

来源：评论

学校读者我要写书评

暂无评论

Photovoltaic Devices: High Performance Roll‐to‐Roll Produced Fullerene‐Free Organic Photovoltaic Devices via Temperature‐Controlled Slot Die Coating (Adv. Funct. Mater. 6/2019)

引用

Advanced Functional materials 2019年第6期29卷

作者： Seok‐In Na You‐Hyun Seo Yoon‐Chae Nah Seok‐Soon Kim Hyojung Heo Jueng‐Eun Kim Nicholas Rolston Reinhold H. Dauskardt Mei Gao Youngu Lee Doojin Vak CSIRO Manufacturing Bag 10 Clayton South Victoria 3168 Australia Professional Graduate School of Flexible and Printable Electronics and Polymer Materials Fusion Research Center Chonbuk National University Deokjin‐dong 664‐14 Jeonju‐si Jeollabuk‐do 561‐756 Republic of Korea Interdisciplinary Program in Creative Engineering School of Energy Materials and Chemical Engineering Korea University of Technology and Education Cheonan 31253 Korea Department of Nano & Chemical Engineering Kunsan National University 290–2 Miryong‐dong Gunsan‐si Jeollabuk‐do 573‐701 Republic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Korea Department of Applied Physics Stanford University Stanford CA 94305 USA Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA

来源：评论

学校读者我要写书评

暂无评论

Ambient-pressure CVD of graphene on low-index Ni surfaces using methane: A combined experimental and first-principles study

引用

Physical Review materials 2018年第7期2卷 073404-073404页

作者： Daniela L. Mafra Jimena A. Olmos-Asar Fabio R. Negreiros Alfonso Reina Ki Kang Kim Mildred S. Dresselhaus Jing Kong Gary J. Mankey Paulo T. Araujo Department of Electrical Engineering and Computer Sciences Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Centro de Ciências Naturais e Humanas Universidade Federal do ABC Santo André 09210-580 SP Brazil INFIQC CONICET Departamento de Química Teórcia y Computacional Facultad de Ciencias Químicas Universidad Nacional de Córdoba X5000HUA Argentina Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Energy and Materials Engineering Dongguk University-Seoul Seoul 04620 Republic of Korea Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Physics and Astronomy The University of Alabama Tuscaloosa Alabama 35487 USA Center for Materials for Information Technology (MINT Center) The University of Alabama Tuscaloosa Alabama 35401 USA Natural Sciences Institute Graduate Program in Physics - Federal University of Para Belem PA 66075-110 Brazil

The growth of large area single-layer graphene (1-LG) is studied using ambient pressure chemical vapor deposition on single-crystal Ni(111), Ni(110), and Ni(100). By varying both the furnace temperature in the range of 800–1100 °C and the gas flow through the growth chamber, uniform, high-quality 1-LG is obtained for Ni(111) and Ni(110) single crystals and for Ni(100) thin films. Surprisingly, only multilayer graphene growth could be obtained for single-crystal Ni(100). The experimental results are analyzed to determine the optimum combination of temperature and gas flow. Characterization with optical microscopy, Raman spectroscopy, and optical transmission support our findings. Density-functional theory calculations are performed to determine the energy barriers for diffusion, segregation, and adsorption, and model the kinetic pathways for formation of different carbon structures on the low-index surfaces of Ni.

关键词： Growth Synthesis 2-dimensional systems Carbon-based materials Atomic force microscopy Chemical vapor deposition Density functional calculations Density functional theory Raman spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Cover Feature: Gas-Phase Transformation of Fluorinated Benzoporphyrins to Porphyrin-Embedded Conical Nanocarbons (Chem. Eur. J. 53/2020)

引用

Chemistry – A European Journal 2020年第53期26卷 12083-12083页

作者： Dr. Dominik Lungerich Dr. Jakob Felix Hitzenberger Michael Ruppel Dr. Tibor Döpper Dr. Matthias Witt Prof. Dr. Ivana Ivanović-Burmazović Prof. Dr. Andreas Görling Prof. Dr. Norbert Jux Prof. Dr. Thomas Drewello Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM) Organic Chemistry II Friedrich-Alexander-University Erlangen-Nuernberg Nikolaus-Fiebiger-Str. 10 91058 Erlangen Germany Center for Nanomedicine Institute for Basic Science (IBS) Seoul 03722 Republic of Korea Graduate Program of Nano Biomedical Engineering (NanoBME) Advanced Science Institute Yonsei University Seoul 03722 Republic of Korea Department of Chemistry and Pharmacy Physical Chemistry I Friedrich-Alexander-University Erlangen-Nuernberg Egerlandstrasse 3 91058 Erlangen Germany Department of Chemistry and Pharmacy Theoretical Chemistry Friedrich-Alexander-University Erlangen-Nuernberg Egerlandstrasse 3 91058 Erlangen Germany Bruker Daltonics GmbH Fahrenheitstrasse 4 28359 Bremen Germany Department of Chemistry and Pharmacy Bioinorganic Chemistry Friedrich-Alexander-University Erlangen-Nuernberg Egerlandstrasse 1 91058 Erlangen Germany

来源：评论

学校读者我要写书评

暂无评论

Internal nanostructure diagnosis with hyperbolic phonon polaritons in hexagonal boron nitride

arXiv

引用

arXiv 2018年

作者： Dai, Siyuan Tymchenko, Mykhailo Xu, Zai-Quan Tran, Toan T. Yang, Yafang Ma, Qiong Watanabe, Kenji Taniguchi, Takashi Jarillo-Herrero, Pablo Aharonovich, Igor Basov, Dimitri N. Tao, Tiger H. Alù, Andrea Department of Electrical & Computer Engineering University of Texas AustinTX78712 United States Institute of Biomedical Materials and Devices Faculty of Science University of Technology Sydney UltimoNSW2007 Australia Department of Physics Massachusetts Institute of Technology CambridgeMA02215 United States National Institute for Materials Science Namiki 1-1 Tsukuba Ibaraki305-0044 Japan Department of Physics Columbia University New YorkNY10027 United States Department of Mechanical Engineering University of Texas AustinTX78712 United States Photonics Initiative Advanced Science Research Center City University of New York New York10031 United States Physics Program Graduate Center City University of New York New York10016 United States Department of Electrical Engineering City College of the City University of New York New York10031 United States

Imaging materials and inner structures with resolution below the diffraction limit has become of fundamental importance in recent years for a wide variety of applications. In this work, we report sub-diffractive internal structure diagnosis of hexagonal boron nitride by exciting and imaging hyperbolic phonon polaritons. Based on their unique propagation properties, we are able to accurately locate defects in the crystal interior with nanometer resolution. The precise location, size and geometry of the concealed defects is reconstructed by analyzing the polariton wavelength, reflection coefficient and their dispersion. We have also studied the evolution of polariton reflection, transmission and scattering as a function of defect size and photon frequency. The nondestructive high-precision polaritonic structure diagnosis technique introduced here can be also applied to other hyperbolic or waveguide systems, and may be deployed in the next-generation bio-medical imaging, sensing and fine structure analysis. Copyright © 2018, The Authors. All rights reserved.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

Dark Excitons: Dark-Exciton-Mediated Fano Resonance from a Single Gold Nanostructure on Monolayer WS2at Room Temperature (Small 31/2019)

引用

Small 2019年第31期15卷

作者： Mingsong Wang Zilong Wu Alex Krasnok Tianyi Zhang Mingzu Liu He Liu Leonardo Scarabelli Jie Fang Luis M. Liz-Marzán Mauricio Terrones Andrea Alù Yuebing Zheng Department of Mechanical Engineering Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA Photonics Initiative Advanced Science Research Center Physics Program Graduate Center Department of Electrical Engineering City College of the City University of New York New York NY 10031 USA Department of Materials Science and Engineering Department of Physics Department of Chemistry Center for 2-Dimensional and Layered Materials The Pennsylvania State University University Park PA 16802 USA Department of Chemistry and Biochemistry California NanoSystems Institute University of California Los Angeles Los Angeles CA 90095 USA Bionanoplasmonics Laboratory CIC biomaGUNE Paseo de Miramón 182 20014 Donostia-San Sebastián Spain Ikerbasque Basque Foundation for Science 48013 Bilbao Spain Biomedical Research Networking Center in Bioengineering Biomaterials and Nanomedicine CIBER-BBN 20014 Donostia-San Sebastián Spain

来源：评论

学校读者我要写书评

暂无评论

Chemical Composition,Antioxidant and Antimicrobial Activity of the Oil and Plant Extract Myrocarpus frondosus Allemao

引用

American Journal of Plant sciences 2017年第7期8卷 1560-1571页

作者： Ivandra Ignês de Santi Darci Alberto Gatto Miriam Ribeiro Galvao Machado Patrícia Soares Bilhalva dos Santos Rogerio Ant?nio Freitag Natural Products Research Laboratory Graduate Program in Biochemistry and Bioprospecting Federal University of Pelotas Pelotas Brasil Postgraduate Program Materials Science and Engineering Federal University of Pelotas Pelotas Brasil Center for Chemical Sciences Pharmaceutical and Food Federal University of Pelotas Pelotas Brasil Chemical and Environmental Engineering Department University of the Basque Country (UPV/EHU) San Sebastian Spain

The objective of this study was to evaluate the chemical profile of extracts (aqueous and ethanol) and the essential oil of Myrocarpus frondosus Allem?o, the sensitivity of strains of Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Listéria monocytogenes, front the extracts and essential oil, by means of the microdilution method in broth, the antioxidant activity by the ABTS method, and the content of phenolic compounds present in the extracts and oil. For the preparation of extracts from plant leaves used with ethanol and water, then separated, the chemical identification of compounds was performed by high-performance liquid chromatography (CLAE-DAD) and gas chromatography coupled to mass spectrum (CG/MS). With the chemical analysis of the extracts obtained the presence of the major compound rutin, and oil major compound was found germacrene B. In the microdilution method in broth, oil and extracts showed inhibition against all the bacteria tested in the concentrations 1 mg/ml to 0.25 mg/ml, except for Staphylococcus aureus at a concentration of 0.25 mg/ml of the essential oil and trans-caryophyllene. The results of Minimum Bactericidal Concentration showed that the essential oil had bactericidal activity at a concentration of 1mg/ml for all bacteria tested and trans-caryophyllene at the same concentration only for Listeria monocytogenes. In relation to the essential oil, antioxidant activity showed higher radical reduction capacity of 40.92% and the content of phenolic compounds ethanol extract showed more 12.72%. The in vitro results support the conclusion that the essential oil is very promising both in antimicrobial action as antioxidant activity and the leaf extracts on antioxidant activity.

关键词： Myrocarpus frondosus Allemao Antimicrobial Antioxidant

来源：评论

学校读者我要写书评

暂无评论

Void distributions reveal structural link between jammed packings and protein cores

arXiv

引用

arXiv 2018年

作者： Treado, John D. Mei, Zhe Regan, Lynne O'Hern, Corey S. Department of Mechanical Engineering & Materials Science Yale University New HavenCT06520 United States Integrated Graduate Program in Physical & Engineering Biology Yale University New HavenCT06520 United States Department of Chemistry Yale University New HavenCT06520 United States Department of Molecular Biophysics & Biochemistry 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 Program in Computational Biology and Bioinformatics Yale University New HavenCT06520 United States

Dense packing of hydrophobic residues in the cores of globular proteins determines their stability. Recently, we have shown that protein cores possess packing fraction φ ≈ 0.56, which is the same as dense, random packing of amino acid-shaped particles. In this article, we compare the structural properties of protein cores and jammed packings of amino acid-shaped particles in much greater depth by measuring their local and connected void regions. We find that the distributions of surface Voronoi cell volumes and local porosities obey similar statistics in both systems. We also measure the probability that accessible, connected void regions percolate as a function of the size of a spherical probe particle and show that both systems possess the same critical probe size. By measuring the critical exponent τ that characterizes the size distribution of connected void clusters at the onset of percolation, we show that void percolation in packings of amino acid-shaped particles and protein cores belong to the same universality class, which is different from that for void percolation in jammed sphere packings. We propose that the connected void regions of proteins are a defining feature of proteins and can be used to differentiate experimentally observed proteins from decoy structures that are generated using computational protein design software. This work emphasizes that jammed packings of amino acid-shaped particles can serve as structural and mechanical analogs of protein cores, and could therefore be useful in modeling the response of protein cores to cavity-expanding and -reducing mutations. Copyright © 2018, The Authors. All rights reserved.

关键词： Amino acids

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：