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Enhanced capacitive properties of manganese dioxide nanowires coating with polyaniline by in situ polymerization

Behavioral and Brain sciences 2014年第2期1659卷 163-168页

作者： Wu, Lihao Li, Yingzhi Yu, Pingping Zhang, Qinghua State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China Jiangsu Laboratory of Advanced Functional Material College of Chemistry and Materials Engineering Changshu Institute of Technology Changshu Jiangsu Province 215500 China

Among the transition metal oxides, manganese oxides have been widely studied for electrochemical capacitors and batteries, because of their high energy density, low cost, natural abundance and environmentally friendliness. However, the poor electrical conductivity of manganese dioxide (MnO2) limits its capacitive response. Polyaniline becomes a unique and promising conducting polymer with a great potential application in supercapacitors due to easy synthesis and good conductivity of the conducting material. Combine the two properties can prepare nanocomposite materials in order to improve the conductivity and capacitive performance of the MnO2. MnO2 coated with polyaniline as the coaxial nanowires were prepared in this report. The polyaniline was synthesized via in situ polymerization and we got a controllable thin coating on the well-dispersed MnO2 nanowires. This hybrid nanostructure enhances the conductivity and capacitive performance of the supercapacitor electrode. The specific capacitance of MnO2/PANI composites is as high as 426 F g^-1 at 1 A g^-1, which is twice much higher than pure MnO2 (188 F g^-1). Copyright © Materials Research Society 2014.

关键词： nanostructure oxide polymerization

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Author Correction: The challenge of mapping the human connectome based on diffusion tractography

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Nature communications 2019年第1期10卷 5059页

作者： Klaus H Maier-Hein Peter F Neher Jean-Christophe Houde Marc-Alexandre Côté Eleftherios Garyfallidis Jidan Zhong Maxime Chamberland Fang-Cheng Yeh Ying-Chia Lin Qing Ji Wilburn E Reddick John O Glass David Qixiang Chen Yuanjing Feng Chengfeng Gao Ye Wu Jieyan Ma Renjie He Qiang Li Carl-Fredrik Westin Samuel Deslauriers-Gauthier J Omar Ocegueda González Michael Paquette Samuel St-Jean Gabriel Girard François Rheault Jasmeen Sidhu Chantal M W Tax Fenghua Guo Hamed Y Mesri Szabolcs Dávid Martijn Froeling Anneriet M Heemskerk Alexander Leemans Arnaud Boré Basile Pinsard Christophe Bedetti Matthieu Desrosiers Simona Brambati Julien Doyon Alessia Sarica Roberta Vasta Antonio Cerasa Aldo Quattrone Jason Yeatman Ali R Khan Wes Hodges Simon Alexander David Romascano Muhamed Barakovic Anna Auría Oscar Esteban Alia Lemkaddem Jean-Philippe Thiran H Ertan Cetingul Benjamin L Odry Boris Mailhe Mariappan S Nadar Fabrizio Pizzagalli Gautam Prasad Julio E Villalon-Reina Justin Galvis Paul M Thompson Francisco De Santiago Requejo Pedro Luque Laguna Luis Miguel Lacerda Rachel Barrett Flavio Dell'Acqua Marco Catani Laurent Petit Emmanuel Caruyer Alessandro Daducci Tim B Dyrby Tim Holland-Letz Claus C Hilgetag Bram Stieltjes Maxime Descoteaux Division of Medical Image Computing German Cancer Research Center (DKFZ) Heidelberg 69120 Germany. k.maier-hein@dkfz.de. Division of Medical Image Computing German Cancer Research Center (DKFZ) Heidelberg 69120 Germany. Sherbrooke Connectivity Imaging Lab (SCIL) Université de Sherbrooke Sherbrooke QC J1K 0A5 QC Canada. Department of Intelligent Systems Engineering School of Informatics and Computing Indiana University Bloomington IN 47408 USA. Krembil Research Institute University Health Network Toronto Canada M5G 2C4. Department of Neurological Surgery University of Pittsburgh School of Medicine Pittsburgh PA 15213 USA. IMT-Institute for Advanced Studies Lucca 55100 Italy. Department of Diagnostic Imaging St. Jude Children's Research Hospital Memphis TN 38105 USA. University of Toronto Institute of Medical Science Toronto Canada M5S 1A8. Institute of Information Processing and Automation Zhejiang University of Technology Hangzhou 310023 Zhejiang China. United Imaging Healthcare Co Shanghai 201807 China. Shanghai Advanced Research Institute Shanghai 201210 China. Laboratory of Mathematics in Imaging Harvard Medical School Boston MA 02215 USA. Center for Research in Mathematics Guanajuato 36023 Mexico. PROVIDI Lab Image Sciences Institute University Medical Center Utrecht Utrecht 3508 The Netherlands. Cardiff University Brain Research Imaging Centre School of Psychology Cardiff University Maindy Road Cardiff CF24 4HQ UK. Department of Radiology University Medical Center Utrecht Utrecht 3508 The Netherlands. Centre de recherche institut universitaire de geriatrie de Montreal (CRIUGM) Université de Montréal Montreal QC Canada H3W 1W5. Sorbonne Universités UPMC Univ Paris 06 CNRS INSERM Laboratoire d'Imagerie Biomédicale (LIB) 75013 Paris France. Center for Advanced Research in Sleep Medicine Hôpital du Sacré-Coeur de Montréal Montreal Canada H4J 1C5. Neuroimaging Unit Institute of Bioimaging and Molecular Physiology (IBFM) Nat

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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Silicon carbide/carbon nanotube heterostructures: Controllable synthesis, dielectric properties and microwave absorption

Silicon carbide/carbon nanotube heterostructures: Controllab...

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作者： Bi, Song Ma, Lan Mei, Bing Tian, Qi Liu, Chao-Hui Zhong, Chang-Rong Xiao, Yong-Dong Xi'an High Technology Institute Xi'an Shaanxi710025 China State Key Laboratory of Advanced Fiber Composites Beijing Composite Materials Company Beijing102101 China School of Materials Science and Engineering Beijing Institute of Technology Beijing100081 China

Carbon nanotube (CNTs) based heterostructures, such as CNT/metal, CNT/polymer, CNT/semiconductor, are attractive for the combined properties and unique applications in cutting-edge electronics and devices. Here in this work, nanostructured beta-silicon carbide (b-SiC)/CNTs heterostructures were synthesized by carbothermal reduction of silica (SiO2) and CNTs with diverse mixing ratios of nC:nSi. Different techniques were carried out for the characterization of the structures and morphologies of the achieved heterostructures, demonstrating dramatic different morphologies which were associated with the different starting ratios of the nC:nSi. The dielectric properties and microwave absorption of wax-based composites were investigated. The parameters for morphologically controllable synthesis and related mechanism for dielectric properties and electromagnetic attenuation were discussed. © 2014 The Society of Powder technology Japan. Published by Elsevier B.V. and The Society of Powder technology Japan. All rights reserved.

关键词： Carbon nanotubes

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The impedance and conductivity studies on BiFeO3 and 0.90BiFeO3-0.10Bi0.5Na0.5TiO3 ceramics

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AIP Conference Proceedings 2015年第1期1665卷

作者： T. Durga Rao Karthik Tangavelua Saket Asthanaa 1Advanced Functional Materials Laboratory Department of Physics Indian Institute of Technology Hyderabad Yeddumailaram Telengana – 502205 India 2Advanced Functional Department of Materials Science and Metallurgical Engineering Indian Institute of Technology Hyderabad Yeddumailaram Telengana – 502205 India

Polycrystalline BiFeO3 and 0.90BiFeO3-0.10Bi0.5Na0.5TiO3 compounds were synthesized by conventional solid state route. The compounds were crystallized in rhombohedral structure with R3c space group. Complex impedance studies revealed that insulating character of both grain and grain boundaries were improved in 0.90BiFeO3−0.10Bi0.5Na0.5TiO3 compound. Both complex and modulus plots confirmed the presence of non-Debye type relaxations in these compounds. Frequency dependence of AC conductivity at different temperatures suggests that charge carriers follow correlated barrier hopping (CBH) model. Estimated activation energies indicated that oxygen vacancies movements are the prime contributors to the conduction in the measured temperature range.

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Microstructure and mechanical properties of cold-rolled Mg-6Al-1Zn alloy strip treated by electropulsing treatment

Microstructure and mechanical properties of cold-rolled Mg-6...

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12th IUMRS International Conference on advanced Materials, IUMRS-ICAM 2013

作者： Jiang, Yan Bin Guan, Lei Tang, Guo Yi Key Laboratory for Advanced Materials Processing of Ministry of Education Institute of Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Beijing 100083 China Department of Structural Steel Functional Materials and Heat Treatment Processing Technology Institute of Aeronautical Materials Beijing 100095 China Advanced Materials Institute and Clearer Production Key Laboratory Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China

ISBN: (纸本)9783038350897

The effect of electropulsing treatment (EPT) on the microstructure and mechanical properties of the cold-rolled Mg-6Al-1Zn alloy strip was investigated. It is found that EPT accelerated the recrystallization behaviour of the cold-rolled Mg-6Al-1Zn alloy strip at a relatively low temperature within a short time of 14 seconds. When the temperature of EPT was 423 K, recovery of Mg matrix happened and few β-Mg17Al12 phaseprecipitated in the Mg matrix. With increasing the temperature to 463 K, recrystallization occurred, accompanying dissolution of β-Mg17Al12 phase. When the temperature was increased to 483 K, complete recrystallization took place and obtained fine microstructure of quasi-single-phase-recrystallized grains. The elongation to failurewas increased from the 6.3% of the rolled strip to 23.5%, while the tensile strength was decreased from 368 MPa to 300 MPa. Further increasing the temperature of EPT, the apparent grain growth occurred and both the tensile strength and elongation to failure reduced. A mechanism for rapid recrystallization process during EPT was discussed. © (2014) Trans Tech Publications, Switzerland.

关键词： Recrystallization (metallurgy)

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Recrystallization and precipitation of β-Mg17Al12 phase of the cold-rolled Mg-9Al-1Zn alloy strip during isothermal annealing

Recrystallization and precipitation of β-Mg17Al12 phase of ...

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12th IUMRS International Conference on advanced Materials, IUMRS-ICAM 2013

作者： Jiang, Yan Bin Zhang, Zhi Hao Guan, Lei Tang, Guo Yi Key Laboratory for Advanced Materials Processing of Ministry of Education Institute of Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Beijing 100083 China Department of Structural Steel Functional Materials and Heat Treatment Processing Technology Institute of Aeronautical Materials Beijing 100095 China Advanced Materials Institute and Clearer Production Key Laboratory Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China

ISBN: (纸本)9783038350897

Effect of isothermal annealing on the microstructure evolution of the cold-rolled Mg-9Al-1Zn alloy strip was investigated. It is found that the competition between the precipitation of β-Mg17Al12 phase and recrystallization of α-Mg matrix occur under the conditions of various annealing temperature and time. At a low annealing temperature (523K), the β-Mg17Al12 particles precipitate preferentially at locally high deformation area and grow into the lamellar-cluster with an increase in the annealing time, retarding the recrystallization of α-Mg matrix. With raising the annealing temperature (573 ~ 623K), both the precipitation of β-Mg17Al12 particles and recrystallization of α-Mg matrix take place. Both recrystallization and grain growth are prone to proceed without precipitation of β-Mg17Al12 particles when the annealing temperature is 673K. A mechanism for the competitive behavior between the precipitation of β-Mg17Al12 phase and recrystallization of α-Mg matrix at various annealing conditions is discussed. © (2014) Trans Tech Publications, Switzerland.

关键词： Precipitation (chemical)

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Studies on high-temperature thermal transformation and dielectric property of aluminum-chromium phosphates

Studies on high-temperature thermal transformation and diele...

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作者： Chen, Ning Gao, Sijian Huo, Jichuan Wang, Haibin He, Jichuan Zhu, Yongchang China Building Materials Academy Beijing 100024 China Chemistry and Chemical Engineering Institute Mianyang Normal University Mianyang 621010 China Key Laboratory of Nonmetal Composite and Functional Materials of Sichuan Province Southwest Science and Technology University Mianyang 621010 China

High-temperature thermal transformation of aluminum-chromium phosphates has been investigated by means of DSC-TG, IR, and XRD analysis. The relative dielectric constant and thermal decomposition were measured and discussed. The results show that crystallization and thermal decomposition started at about 1,273 K, only AlPO4 and Cr2O3 have been found at 1,873 K due to the decomposition of PO 3-, P 2O 72-, and PO 43-. The relative dielectric constant is fluctuant. © 2013 Akadémiai Kiadó, Budapest, Hungary.

关键词： Aluminum compounds

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Reversible Luminescence Switching of an Organic Solid: Controllable On-Off Persistent Room Temperature Phosphorescence and Stimulated Multiple Fluorescence Conversion

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advanced Optical Materials 2015年第9期3卷 1184-1190页

作者： Li, Chenyu Tang, Xi Zhang, Liuqing Li, Cuihong Liu, Zhengping Bo, Zhishan Dong, Yong Qiang Tian, Yong-Hui Dong, Yuping Tang, Ben Zhong Beijing Key Laboratory of Energy Conversion and Storage Materials Department of Chemistry Beijing Normal University No. 19 XinJieKouWai Street Beijing100875 China College of Life Science Research Center of Analytical Instrumentation Key Laboratory of Bio-resource and Eco-environment Ministry of Education Sichuan University No. 29 Wangjiang Road Chengdu610064 China College of Materials Science and Engineering Beijing Institute of Technology 5 South Zhongguancun Street Beijing100081 China HKUST-Shenzhen Research Institute No. 9 Yuexing first RD South Area Hi-tech Park Nanshan Shenzhen518057 China Department of Chemistry Division of Life Science State Key Laboratory of Molecular Neuroscience Institute for Advanced Study Institute of Molecular Functional Materials Division of Biomedical Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

On-off-switchable, persistent, room-temperature phosphorescence (373 ms) is realized in organic solids based on bis(4-(9H-carbazol-9-yl)phenyl)methanone. The reversible on-off RTP switching can be controlled by repeatedly chloroform fuming and heating (or grinding). Multi-ple-color fluorescence is also feasible, and they reversibly convert to each other under the stimuli of heating, shearing, and fuming with varied solvents. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Phosphorescence

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Macrocyclic Transformations from Norrole to Isonorrole and an N‐Confused Corrole with a Fused Hexacyclic Ring System Triggered by a Pyrrole Substituent

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Angewandte Chemie 2016年第9期128卷

作者： Miao Li Pingchun Wei Masatoshi Ishida Xin Li Mathew Savage Rui Guo Zhongping Ou Sihai Yang Hiroyuki Furuta Yongshu Xie Key Laboratory for Advanced Materials and Institute of Fine Chemicals Shanghai Key Laboratory of Functional Materials Chemistry East China University of Science and Technology Shanghai 200237 P.R. China Education Center for Global Leaders in Molecular Systems for Devices and Center for Molecular Systems Department of Chemistry and Biochemistry Graduate School of Engineering Kyushu University Fukuoka 819-0395 Japan School of Chemistry University of Manchester Manchester m139pl UK School of Chemistry and Chemical Engineering Jiangsu University Zhenjiang 212013 P.R. China

Three kinds of fused porphyrinoids, L2 – L4 , possessing different types of corrole‐based frameworks were synthesized from a pyrrole‐substituted corrole isomer (norrole L1 ). Oxidation of L1 afforded a unique N‐C meso ‐fused pyrrolyl isonorrole L2 , involving the fusion of an auxiliary pyrrolic NH moiety with a meso‐sp 3 ‐hybridized carbon atom. Subsequently, L2 underwent macrocycle transformations to give singly and doubly N‐C Ar ‐fused N‐confused corroles, L3 and L4 , respectively. L3 and L4 contain fused [5.7.6.5]‐tetra‐ and [5.6.7.7.6.5]‐hexacyclic structures, respectively, prepared through lateral annulation. These skeletal transformation reactions from norrole to its isomer isonorrole and finally to N‐confused corrole indicate that multiply fused porphyrinoids could be readily synthesized from pyrrole‐appended confused porphyrinoids.

关键词： Aromatizität Corrole Kondensierte Ringe N-invertierte Corrole Porphyrinoide

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ONE-POT SYNTHESIS OF POLYTHIOPHENE BLOCK COPOLYMERS

ONE-POT SYNTHESIS OF POLYTHIOPHENE BLOCK COPOLYMERS

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第六届高分子化学国际学术研讨会

作者： Zong-Quan Wu Ya-Xin Xue Ting-Ting Yin Long-Mei Gao Na Liu Yuan-Yuan Zhu Department of Polymer Science and Engineering Hefei University of Technology and Key Laboratory of Advanced Functional Materials and Devices

Conjugated block polymers have attracted considerable interest in the past few decades,primarily owing to their potentials for applications in optoelectronics.1 Amongπ-conjugated polymers,poly(3-hexylthiophene)(P3HT)has been widely investigated due to its excellent electronic properties and synthetic accessibility.2 The polymer has also been incorporated into different types of block copolymers to control the patterning and/or to optimize the optoelectronic ***,there are two

关键词： ONE-POT SYNTHESIS OF POLYTHIOPHENE BLOCK COPOLYMERS

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