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Magnetic nano-structures

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Magnetic Nano-structures

Highly flexible,mechanically strengthened metallic glass-based composite electrode with enhanced capacitance and cyclic stability

中国颗粒学会2004年年会暨海峡两岸颗粒技术研讨会会议

作者：姚永德 Institute of Physics Academia SinicaTaipei 115China

＜正＞Fabrication of magnetic nano-structures with dots array and wires has been paid attention recently due to the application of high-density magnetic recording. In this study, we fabricated the magnetic dots array and wires through several ways that ensure the arrangement of magnetic dots and wires to be the structures we designed. Their magnetic properties are studied experimentally.

关键词： nano-structures fabrication

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Rare Metals 2022年第11期41卷 3717-3728页

作者： Yi Xu Pak Man Yiu Yu-Kun Wang Xiao-Meng Qin Tamaki Shibayama Seiichi Watanabe Masato Ohnuma Da-Zhu Chen Hua Cheng Chan-Hung Shek Zhou-Guang Lu Chen Liu Guangdong Research Center for Interfacial Engineering of Functional Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen518060China Department of Materials Science and Engineering City University of Hong KongHong Kong999077China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen518060China Division of Quantum Science and Engineering Faculty of EngineeringCentre for Advanced Research of Energy and MaterialsHokkaido UniversitySapporo0608628Japan Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Department of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhen518060China

The design of flexible composite electrodes has become the top priority in energy storage devices for the development of future wearable intelligent ***,searching for fully integrated,ultrathin flexible composite electrodes with satisfying electrochemical performance is still a major ***,we introduce a nanoporous gold metallic glass(MG) ribbon-based composite electrode with excellent electric conductivity,mechanical flexibility,and extra capacitance by integrating polypyrrole(PPy) into wrinkled nanoporous ribbon(NPG@MG).The freestanding,ultrathin,highly conductive and flexible" nature of the composite electrode prevents the conducting polymer from structural instability resulting from the volume swell and shrink during the charging/discharging circulation,and the packed PPy provides protection for the wrinkled topology on the surface of the MG *** capacitance of pure NPG@MG-PPy composite electrode reached 393 mF·cm^(-2).The ultra-thin all-solid-state flexible supercapacitor demonstrates an excellent capacitance of 172 mF·cM^(-2)(14.8 F·cm^(-3)),accompanied by a superior cycling capability after 8000 charge/discharge cycles attributed to mechanical *** areal energy density also reached 0.74 mWh·cm^(-3)(9μWh·cm^(-2)) at a power density of 1 μW·cm^(-2).This work provides valuable concepts on the design of PPy-based hybrid materials for flexible energy storage systems with greatly enhanced electrochemical performances.

关键词： Metal-matrix composites(MMCs) Thin films Porosity nano-structures

The oscillatory behavior, static and dynamic analyses of a micro/nano gyroscope considering geometric nonlinearities and intermolecular forces

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Acta Mechanica Sinica 2013年第6期29卷 851-863页

作者： M.Mojahedi M.T.Ahmadian K.Firoozbakhsh School of Mechanical Engineering Sharif University of Technology Center of Excellence in Design Robotics and AutomationDepartment of Mechanical EngineeringSharif University of Technology

The nonlinear dynamic and static deflection of a micro/nano gyroscope under DC voltages and base rotation are investigated. The gyroscope undertakes two cou- pled bending motions along the drive and sense directions and subjected to electrostatic actuations and intermolecular forces. The nonlinear governing equations of motion for the system with the effect of electrostatic force, intermolecular tractions and base rotation are derived using extended Hamilton principle. Under constant voltage, the gyroscope finds the preformed shape. First, the deflection of the rnicro/nano gyroscope under electrostatic forces is obtained by static and dynamic analyses. Furthermore, the static and dynamic in- stability of the system are investigated. Afterward the oscillatory behavior of the pre-deformed micro/nano gyroscope around equilibrium is studied. The effects of intermolecular and nonlinear parameters on the static and dynamic de- flection, natural frequencies and instability of the micro/nano gyroscope are studied. The presented model can be used to exactly determine static and the dynamic behavior of vibratory micro/nano gyroscopes.

关键词： nano-structures Microstructures Static dynamic

Novel nanostructured MnO_2 Prepared by Pulse Electrodeposition:Characterization and Electrokinetics

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Journal of Materials Science & Technology 2008年第6期24卷 857-862页

作者： H.Adelkhani M.Ghaemi S.M.Jafari Department of Chemistry School of SciencesTarbiat Modares UniversityP.O.Box 14115-175TehranIran Department of Chemistry Science FacultyGolestan UniversityP.O.Box 49138-15739GorganIran Department of Mathematics Science FacultyGolestan UniversityGorganIran

Pulse current technique was applied for the preparation of novel electroactive manganese dioxide and possible influences of different electrokinetic phenomena on material characteristics were discussed. The characterizations of pulse deposited sample （pcMD） were carried out by different techniques： Fourier transform infrared spectroscopy （FTIR）, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, Brunauer-Emmett-Teller （BET） method, Raman spectroscopy, and atomic force microscopy （AFM）. SEM image revealed that pulse current could improve the current distribution. This was confirmed by AFM images showing a decrease in surface roughness of pcMDs in comparison to amorphous samples, which were deposited by direct current （dcMD）. Higher distortion of MnO6 octahedral environment of dcMD was detected by FTJR and Raman spectroscopy. Cyclic voltammetric （CV） measurements showed a generally higher energy level drained from the second electron discharge of pcMD. This is mainly attributed to a higher surface area and a lower diffusion pass of electrons and protons arisen via a rather unique nanostructural arrangement of pcMD grains. Results indicate a higher surface area available for the non homogenous second electron discharge of pcMD grains.

关键词： Manganese dioxide Pulse electrodeposition nano-structures Electrocrystallization

MOLECULAR DYNAMICS SIMULATION OF POLYMER/CARBON nanoTUBE COMPOSITES

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Acta Mechanica Solida Sinica 2015年第4期28卷 409-419页

作者： Sumit Sharma Rakesh Chandra Pramod Kumar Navin Kumar Department of Mechanical Engineering Dr.B.R.Ambedkar National Institute of Technology School of Mechanical Materials & Energy Engineering (SMMEE) Indian Institute of Technology

In this paper, we present classical molecular dynamics （MD） simulations of model polymer/CNT composites constructed by embedding a single wall （10,10） CNT into two different amorphous polymer matrices： poly（methyl methacrylate） and poly{（m-phenylene-vinylene）-co- [（2,5-dioctoxy-p-phenylene） vinylene]}, respectively, with different volume fractions. The simulation results support the idea that it is possible to use CNTs to mechanically reinforce an appropri- ate polymer matrix, especially in the longitudinal direction of the nanotube. The comparison of the simulation results with the macroscopic rule-of-mixtures for composite systems showed that for strong interfacial interactions, there can be large deviations of the results from the rule-of- mixtures. In order to verify this study, results obtained have been compared with those given by Elliott and Han （2007）.

关键词： nano-structures elasticity mechanical properties computational modeling

Research progress of nanocellulose for electrochemical energy storage:A review

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Journal of Energy Chemistry 2020年第12期29卷 342-361页

作者： Ruiqi Guo Lixue Zhang Yun Lu Xiaoli Zhang Dongjiang Yang State Key Laboratory of Bio-fbers and Eco-textiles Shandong Collaborative Innovation Center of Marine BiobasedFibers and Ecological Textiles Institute of Marine Biobased MaterialsSchool of Environmental Science and EngineeringQingdao UniversityQingdao 266071ShandongChina College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071ShandongChina Department of Wood Anatomy and Utilization Research Institute of Wood IndustryChinese Academy of ForestryBeijing 100091China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina

Recently, in response to the major challenges in energy development and environmental issues, tremendous efforts are being devoted to developing electrochemical energy storage devices based on green sustainable resources. As a class of green materials, nanocellulose(NC) has received extensive attention. In this review, we summarize the research progress of NC derived materials in electrochemical energy storage. Specifically, we first introduce various synthesis methods based on NC and the pretreatment process to increase the conductivity. Then we focus on the specific application of NC in electrochemical energy storage devices. Finally, we summarize the previously reported work and put forward views on the further development of NC in the field of electrochemical energy storage.

关键词： nano-structures Electrical properties nanocellulose Energy storage field

Salt-assisted synthesis of tree-like oriented SnO_(2) nanodendrite

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Frontiers of Chemical Science and Engineering 2011年第2期5卷 227-230页

作者： Jinquan SUN Zifeng YAN Hongzhi CUI State Key Laboratory for Heavy Oil Processing PetroChina Key Laboratory of CatalysisChina University of PetroleumQingdao 266555China College of Material Science and Technology Shandong University of Science and TechnologyQingdao 266510China

Tree-like SnO_(2) nanodendrites in large amounts have been prepared through two-step *** nanoparticles used as the precursors have taken aggrega-tion forming tree-like or string of *** samples were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),high-resolution transmission electron microscopy(HRTEM)and energy dispersive spectrometer(EDS),*** results showed that molar ratio of the ethanol/distilled water is an important factor for formation of the different dendrite *** are different morphologies between tree-like SnO_(2) nanowhiskers and bunch of SnO_(2) ***,they are growing along the [112].

关键词： crystal morphology nano-structures nano-dendrite

Influence of Equal Channel Angular Pressing on Tribological Properties of Low Carbon Steel (Fe-0,09C-0,64Si-,26Mn)

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Journal of Surface Engineered Materials and Advanced Technology 2015年第1期5卷 24-27页

作者： P. G. Mordovskoi S. P. Yakovleva S. N. Maharova Department of Material Science The V.P. Larionov Institute of Physical and Technical Problems of the North SB RAS Yakutsk Russia

This paper presents the results of equal channel angular pressing (ECAP) and subsequent heat treatment (HT) as a method to improve the wear resistance of metallic materials in friction sliding. The effect of ECAP and HT on the microstructure and mechanical properties of low carbon steel is investigated in this work. The mechanisms of wear resistance of steel with ultrafine and nanostructures produced by equal-channel angular pressing is analyzed. The results show that ECAP at room temperature and annealing at 350°C and 450°C can be used as a technology of reducing wear in friction sliding.

关键词： Low Carbon Steel Equal Channel Angular Pressing Ultrafine and nano-structures Heat Treatment Wear

THERMOMECHANICAL MODELING OF POLYMER nanoCOMPOSITES BY THE ASYMPTOTIC HOMOGENIZATION METHOD

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THERMOMECHANICAL MODELING OF POLYMER NANOCOMPOSITES BY THE A...