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检索条件"任意字段=第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会"

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High Temperature Annealing of Iron Nanowires

High Temperature Annealing of Iron Nanowires

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者： Marcin Krajewski Wei Syuan Lin Hong Ming Lin Mateusz Tokarczyk Sabina Lewinska Natalia Nedelko Anna Slawska-Waniewska Grzegorz Kowalski Jolanta Borysiuk Dariusz Wasik University of Warsaw Tatung University Polish Academy of Sciences

This work presents the results of high temperature annealingof iron nanowires at five different temperatures(ranging200–800℃) in the slightly oxidative atmosphere. Investigatednanomaterial was prepared in simple chemical reductionprocess from aqueous solution of iron trichloride placed inexternal magnetic field. Experimental results allowed determininghow magnetic properties of as-prepared as well asannealed iron nanowires change in respect to their *** also delivered information about phase transitionsoccurred in as-prepared sample under thermal treatment.

关键词： annealing,iron,magnetic properties,nanowires

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Batch Preparation of Amphiphilic Janus Gold Nanoparticles via Drop Liquid/Liquid Interfacial Reaction

Batch Preparation of Amphiphilic Janus Gold Nanoparticles vi...

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者： Kun Luo Haiming Wang Yujia Luo Yuanying Mu Yongdong Xiang Gavin Hazell Stephen J.Roser Karen J.Edler Key Laboratory of New Processing Technology for Nonferrous Metals & Materials Ministry of Education Guilin University of Technology China Medical University Department of Chemistry University of Bath

A facile method is developed for the batch preparation of amphiphilic Janus gold nanoparticles(GNPs)by ultrosonic dispersion in dimethyl formamide from precursor films,which were synthesized by the liquid/liquid interfacial reaction(LLIR)between chloro(triphenyl)-phosphine gold in toluene and drops of tetrakis(hydroxymethyl)phosphonium chloride alkaline *** shift in the UV-vis spetrum of the GNP colloid in comparison to the LLIR films indicates the detachment of the assembled GNPs.

关键词： Langmuir Batch Preparation of Amphiphilic Janus Gold Nanoparticles via Drop Liquid/Liquid Interfacial Reaction

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First-principles study of crystal structure of Sr2FeNbO6

First-principles study of crystal structure of Sr2FeNbO6

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者： Ge ben Ai Desheng Lin Xuping Tsinghua University

Double-perovskite oxides are widely studied in recent years because of their unique electromagnetic ***2FeNbO6 has the ability to catalyze waterdecomposition in high temperature, can be used as hydrogen-electrode materials in solid oxide electrolysis *** and chemical activities of double-perovskites(A2BB'O6) are mainly determined by B-site and B'-site elements. The influencing factors include the element type, ionic radius, and site occupancy *** Sr2 Fe Nb O6, the site occupancies of Sr and O are definite. However, it is not sure whether Fe and Nboccupy in a random or nonrandom ***, it is not easy to determine ***, we studied this issue using the first-principle calculation ***, different B-site occupancy models were established. Then the band structure and crystal structure data of each model were calculated and compared with the experimental results. Results show that, the site occupancies of Fe and Nb are not in a random way. When Fe and Nb are arranged alternately, the total energy of the system is the lowest, and the calculated results are most consistent with the experimental data.

关键词： First-principles Double-perovskite Crystal structure

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Study on the phase transformation mechanism of VO2 powders prepared by hydrothermal process

Study on the phase transformation mechanism of VO2 powders p...

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者：胡毅 C.-F.Wang C.-C.Lin Department Materials Engineering Tatung University

Vanadium dioxide has a metal-insulator phase transition characteristics, which are the significant changes in the optical, electrical properties due to changes in the crystal structure and after the phase transition. Vanadium dioxide thus is a very promising material for development in the use as thermoelectric switches, sensors, storage of materials and wisdom windows applications. In this study, VO2 nanoparticles were prepared by hydrothermal method under heating 24 hours in different temperatures with vanadium pentoxide as the raw material and using oxalic acid as a reaction assistant. VO2 powders of different phases were obtained under different reaction temperature and the microstructure of the powder and the phase transition temperature were investigated using XRD, SEM, TEM, Raman and DSC. The results showed that nanoparticles with predominantly thermally induced phase VO2（M） can be obtained by hydrothermally heated at 280℃ for 24 hours. The particles size of synthesized VO2（M） powder is of about 200 ~ 400 nm.

关键词： Vanadium dioxide,Oxalic acid,Hydrothermal,phase transition

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Controlled Growth of Flexible SiC Field Emitters and Their Field Emission Properties

Controlled Growth of Flexible SiC Field Emitters and Their F...

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者： Weiyou Yang Shanliang Chen Institute of Materials Ningbo University of Technology

Flexible field emission(FE) emitters, with their unique advantages of being lightweight and conformable, are promising to enable a wide range of technologies such as roll-up flexible FE displays, e-papers, and flexible light-emitting diodes. In the present work, we demonstrated the growth of highly flexible Si C field emitters with low turn-on fields and excellent emission stabilities. The n-type Si C nanoneedles with ultra-sharp tips and tailored N-doping levels were controlled synthesized via a catalyst-assisted pyrolysis process on carbon fabrics by tailoring the gas mixture and the cooling rate. The investigations on their turn-on fields and the threshold fields as well as the current emission stabilities suggested that the as-synthesized Si C field emitters possessed very excellent properties. Furthermore, characterizations of the FE properties under repeated bending cycles and different bending states revealed that the Si C field emitters were mechanically and electrically robust with unprecedentedly high flexibility and stabilities. These findings underscore the importance of concurrent morphology and composition controls in nanomaterial synthesis and establish Si C nanoneedles as the most promising candidate for flexible FE applications.

关键词： Controlled Growth of Flexible SiC Field Emitters and Their Field Emission Properties SiC

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Dental Filling Properties of Spray Pyrolyzed Bi2O3/ZrO2 Composite Powder

Dental Filling Properties of Spray Pyrolyzed Bi2O3/ZrO2 Comp...

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者： May-Show Chen Bo-Jiun Shao Chin-Yi Chen Jen-Chang Yang 林中魁 Department of Dentistry Taipei Medical University Hospital Department of Materials Science and Engineering Feng Chia University School of Dental Technology College of Oral Medicine Taipei Medical University

Mineral trioxide aggregates(MTA), consisting of Portland cement(75%), bismuth oxide(20%), and others(5%), are commonly used as dental filling materials. Within MTA, bismuth oxide powder is served as radiopacifier. In the present study, preparation of Bi2O3/Zr O2 composite powder by spray pyrolysis was attempted and used as the radiopacifying materials within MTA. During spray process, bismuth nitrate(Bi(NO3)3·5H2O) and zirconyl nitrate(Zr O(NO3)2) were used as precursors. By controlling the pyrolyzed temperature(550, 650, 750, and 850℃) and adding suitable amount of zirconia, bismuth/zirconium oxide composite powder was prepared and characterized. The as-prepared composite powder was then solidified according to MTA constitution to evaluate its solidification and radiopacifying performance. The experimental results reveal that the 750℃ spray-pyrolyzed composite powder exhibited the best overall performance in the present study.

关键词： Portland cement,bismuth oxide,spray pyrolysis,radiopacifying

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Study on the conductivity of Bi-doped Ba0.6Sr0.4CeO3 electrolyte materials

Study on the conductivity of Bi-doped Ba0.6Sr0.4CeO3 electro...

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者： Shi Yuxia Zhang Jian Lin Xuping Ai Desheng Tsinghua University

Ba0.6Sr0.4Ce O3 electrolyte materials have special proton conducting character, which allows it to be applied in intermediate temperature solid oxide fuel cells. The effects of Bi-doping on the conductivity of Ba0.6Sr0.4Ce O3 and its corresponding mechanisms were studied. Ba0.6Sr0.4Ce1-xBixO3(x = 0, 0.05, 0.1, 0.2) oxides were prepared using high temperature solid-phase process. X-ray diffraction and SEM were used to analysis how the doping of Bi influence on the phase composition and morphology of the materials. The electrical conductivity of the sintered samples in air and hydrogen atmosphere were measured using AC impedance spectroscopy tese, which was used to study on the mechanism of the materials in different atmosphere. The results indicated that Ba0.6Sr0.4Ce1-xBix O3 electrolyte materials with different Bi-doping content had obtained single-phase and high air tightness after being sintered at 1300℃ for 10 h in the air. The doping of Bi in the Ba0.6Sr0.4Ce O3 system effectively improved its conductivity. When the doping amount x = 0.2, it reaches the hightest conductivity, which is 9.11×0-3 S·cm-1 in hydrogen atmosphere at 700℃.

关键词： BaCeO3 proton-conducting electrolyte SOFC conductivity

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Nanoparticles Prepared by Spray Pyrolysis

Nanoparticles Prepared by Spray Pyrolysis

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者： Gang-Qin SHAO Jin-Hua LIU Zhen-Sheng GAO Jian LI Hui-Feng ZHANG State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The development of new synthetic methods or methodologies that provide controlled-over size, morphology and crystal structure have led advances in novel functional materials for specific purpose(e.g. magnetoelectric materials, energetic materials, sensors, catalyst). The spray pyrolysis technique has been generally accepted because the apparatus is simple, continuous, and easily scaled up to mass *** this work, the nanoparticles formation of oxides by spray pyrolysis is studied. The process involves thermal reactions of low-velocity aerosols(i.e., solid or liquid droplets suspended in air or argon) produced by a pneumatic nebulizer carried in a gas flow through a ceramic tube furnace up to 950 ℃. By nebulizing precursor solutions containing water soluble metal salts(e.g. hydroxides, acetate, nitrate, chloride) or metal coordination complexes(e.g. ammonium, oxo-), a myriad of mono- and multi-metallic oxide powders have been synthesized. With the addition of polymers or other composites forming materials, new and complex architectures can be easily added to the simple oxide *** diversity of applications and nanoparticles accessible have proven the spray pyrolysis technique to be a powerful tool. The relationship among the morphology, phase and function can be readily pursued by exploring new precursors and aerosol synthetic routes.

关键词： Nanoparticles Spray Pyrolysis Synthesis Aerosol

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VO2 Nanoparticles for Smart Windows Combining Energy Savings and Electrical Generation

VO2 Nanoparticles for Smart Windows Combining Energy Savings...

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者：高彦峰 Shanghai University

Thermochromic smart windows exhibit a phase transition or a microstructural change and have a changeable character in terms of refection/absorption/transportation of solar radiation by responding to environmental temperature changes. Traditional smart windows and solar cells cannot be combined into one device for energy saving and electricity generation. In this talk, we discuss the synthesis and properties of VO2 and poly(N-isopropylamide) thermosensitive materials and poly(N-isopropylamide) can dows. A VO2 film can respond to the environmental temperature to intelligently regulate infrared transmittance while maintaining visible transparency and can be applied as a thermochromic smart window. novel VO2-based smart window that partially utilises light scattering to solar cells around the glass panel for electricity generation. This smart window combines energy-saving and generation in one device, and offers potential to intelligently regulate and utilise solar radiation in an efficient *** the beginning of this research, we studied the synthesis of VO2 flexible foils for energy savings, which is based on VO2 nanoparticles. Quasi-spherical VO2 nanoparticles with uniform size and high crystallinity are ideal functional materials for applications in field-effect transistors, smart window coatings and switches. However, the synthesis of these VO2 nanoparticles has long been a challenge. We developed a novel doping strategy for the simultaneous control of the size, morphology and polymorphology of VO2 nanoparticles. Doping is able to induce the crystal structure change and exhibits a significant promoting effect on the formation of doped monoclinic VO2(VO2(M)). Specifically, by antimony(Sb3+) doping, hexagonal-shaped, well crystalline monoclinic VO2 nanoparticles with tunable sizes(8- 30 nm) and controllable polymorphs were synthesized via one-pot, hydrothermal method. The Sb3+-doped VO2(M) nanoparticles exhibit excellent properties in metal-semiconductor transfor

关键词： VO2 nanoparticle dispersion film smart window electrical generation

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Synthesis and properties of nanostructured materials for hydrogen storage and lithium battery

Synthesis and properties of nanostructured materials for hyd...

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者： Xinghua Chang Jun Chen Lei Xie Jie Zheng Xingguo Li Beijing National Laboratory for Molecular Sciences (BNLMS) (The State Key Laboratory of Rare Earth Materials Chemistry and Applications) College of Chemistry and Molecular Engineering Peking University

We study influence of particle size, crystal size and pore size on hydrogen storage and lithium battery. For example, Mg-based alloys are promising hydrogen storage materials due to their high hydrogen capacity, low specific weight and abundance. However, the major problem of magnesium is its slow reaction rate and high sorption temperature. We synthesize Mg-based alloys by plasma method combined with the gas-solid reaction. Our results show that plasma is convenient to synthesize necessary nanoparticles used for Mg-based hydrogen storage materials;the gas-solid reaction of nanoparticles is an effective way to synthesize nanostructured Mg-based alloys;nanostructure can enhance hydrogen storage properties of Mg-based alloys. Amides such as Mg(NH2)2 and Li2 NH have attracted numerous attentions because of their high hydrogen storage capacity and low operative temperature. However, their poor sorption kinetics limits their practical use. In order to improve their hydrogen storage properties, we synthesized Mg(NH2)2 and Li2 NH hollow nanospheres with diameter of 100 nm and thickness of 10 nm through the Kirkendall effect in arc plasma process and found that the structure dramatically enhanced the hydrogen desorption kinetics because of their short distance for Mg2+ diffusion and large specific surface *** has a very high theoretical capacity of 4200 m Ah/g as the anode materials for lithium ion batteries, which is near ten times higher than that of the current commercial graphite anode. However, it suffers from severe volume expansion/contraction during the charge/discharge processes, which is the main obstacle for its application. In our work, we prepare Si/C composite anodes with an intercalated Si/C multilayer structure by alternatelydepositing C and Si by plasma decomposition of C2H2 and magnetron sputtering of a Si target, respectively. Near theoretical capacity can be achieved(about 4000 m Ah/g) for more than 100 cycles for thin Si layers, which is attributed

关键词： Nanoparticles,Mg-based alloys,Plasma synthesis,Hydrogen storage,Lithium ion batteries

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