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Multiferroic and magnetoelectric properties of La_(0.1)Ba_(0.9)Fe_(12)O_(19) ceramics

Chinese Science Bulletin 2014年第36期59卷 5212-5217页

作者： Guolong Tan Wenrong Wang Wei Li Limin Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

La0.1Ba0.9Fe12O19 powders with similar hexagonal crystal structure to Ba Fe12O19 have been successfully synthesized using polymer precursor method. The powders were suppressed into pellets, which were sintered into ceramics at 1,300 °C for 1 h. The structure and morphology of the ceramics have been determined by X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM). Clear electric hysteresis loops upon different amplitude of external fields indicates that La0.1Ba0.9Fe12O19 is a kind of possible ferroelectric compound. The maximum remnant polarization of La0.1Ba0.9Fe12O19 ceramic is estimated to be *9.6 l C/cm2. The Fe O6 octahedron in its perovskite-like hexagonal unit cell as well as the shift of Fe3?off the center of octahedron are proposed to be the origin of electric polarization in La0.1Ba0.9Fe12O19. Simultaneous occurrence of large ferroelectricity and strong ferromagnetism has been observed in La0.1Ba0.9Fe12O19 ceramics. More interestingly, this compound demonstrates electronic polarization behavior being actuated by an applied magnetic field, indicating the existence of magnetoelectric(ME) coupling effect in the La0.1Ba0.9Fe12O19 ceramics. Our results may lead to new device applications such as magnetically recorded ferroelectric memory.

关键词：铁电性陶瓷场发射扫描电子显微镜磁特性晶体结构剩余极化 FESEM X射线衍射

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Influence of ZrC on the microstructure of its surrounding resin-based carbon at high temperature

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Carbon 2016年 110卷 523-523页

作者： Zhong-wei Zhang Min Mei Liang Li Ce-wen Nan Jun-shan Wang Zheng-hui Xu State Key Laboratory of New Ceramics & Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing 100076 China China Academy of Launch Vehicle Technology Beijing 100076 China

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Functional triboelectric generator as self-powered vibration sensor with contact mode and non-contact mode

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Nano Energy 2015年 14卷 209-216页

作者： Qijie Liang Zheng Zhanga Xiaoqin Yan Yousong Gu Yingli Zhao Guangjie Zhang Shengnan Lu Qingliang Liao Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China

We demonstrated a sort of self-powered vibration sensor based on a triboelectric generator (TEG) using triboelectrification and electrostatic induction effects. The as-prepared TEG delivered an output voltage of 34.06 V and short-circuit current density of 22.5 mA/m 2 corresponding to a maximum power density of 0.77 W/m 2 , which was capable of driving five LEDs directly and continuously with working frequency of 50 Hz without any rectification circuit or energy storage unit. The vibration sensor has a detection range of 0–500 Hz, and high accuracy. Besides, it could realize detection under non-contact mode, which would protect the device and the detected object in operation. Moreover, the stability and repeatability could also be well retained. The TEG based vibration sensor possessed great potential in machines operation monitoring, process control, and security applications in unreachable and access-denied extreme environments.

关键词： Triboelectric generator Vibration sensor Self-powered Non-contact mode

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Synergistic Reinforcement of Phenol-Formaldehyde Resin Composites by Poly(Hexanedithiol)/Graphene Oxide

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Journal of materials Science and Chemical Engineering 2015年第8期3卷 56-70页

作者： Jingliang Wei Chun Wei Le Su Jun Fu Jian Lv College of Materials Science and Engineering Guilin University of Technology Guilin China Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education Guilin China Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Non-Ferrous Metal and Featured Materials Guilin China

In this paper, the preparation of graphene oxide was achieved by Hummers method and the surface modification was achieved by poly(hexaneditiol), which was a synthetic thermotropic liquid crystalline polymer. The c-PHDT/GO/PF composites were prepared by blending, rolling and compression molding techniques. Then, the as-prepared samples were characterized by FTIR, Raman, XRD, TGA and POM to obtain information on their structures and properties. After that, the effects of c-PHDT/GO content on the mechanical properties, friction performance and dynamic mechanical performance of c-PHDT/GO/PF composites were studied by Mechanical and Dynamic Mechanical Analysis (DMA) methods. Also, Scanning Electron Microscope (SEM) was used for the characterization of wear and fracture surface morphology. The results revealed that the reinforcing effect of c-PHDT/GO was significant as a considerable enhancement on the mechanical performance of c-PHDT/GO/PF composite as compared to pure phenol-formaldehyde composites was observed: the impact strength, bending modulus and bending strength increased from 1.63 kJ/m2, 8.61 GPa and 41.55 MPa to 2.31 kJ/m2, 10.16 GPa and 54.40 MPa respectively at the c-PHDT/GO content = 0.75%. Moreover, the initial storage modulus increased by 28.4%, while the wear mass loss decreased by 17.8%. More importantly, the reinforcement by c-PHDT/GO was further enhanced as compared to GO/PF and p-PHDT/GO/PF composites, the impact strength of c-PHDT/GO/PF composite increased by 27.6% and 11.1%, the bending strength increased by 11.8% and 7.6%, the initial storage modulus increased by 16.2% and 4.2% and the mass loss due to wear decreased by 12.7% and 8.8%, respectively. Based on these results, we can conclude that the surface modification of GO by poly(hexanedithiol), which includes synergistic effect by c-PHDT and GO, improves the interfacial adhesion between GO and the resin matrix, thus reinforcing the composites.

关键词： Poly(Hexanedithiol) Graphene Oxide Phenol Formaldehyde Resin Mechanical Properties

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Synthesis and Properties of new Multifunctional Hexaferrite Powders

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Procedia Engineering 2015年 102卷 1885-1889页

作者： J. Li H.-F. Zhang G.-Q. Shao D. Chen G.-G. Zhao Z.-S. Gao J.-H. Liu J.-S. Lu X.-B. Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Key Laboratory of Nondestructive Testing of Ministry of Education Nanchang Hangkong University Nanchang 330063 China

Sr 3 Co 2 Fe 24 O 41 (Sr 3 Co 2 Z) hexaferrite has potential applications in spintronics and multiferroics. To synthesize a single-phase Sr 3 Co 2 Z is very difficult now while the corresponding reaction process lacks investigating. In this work, the reaction mechanism to synthesize Z/W/M-type strontium hexaferrite powders was studied. Results show that the SrFe 12 O 19 (SrM) could react with CoFe 2 O 4 to form SrCo 2 Fe 16 O 27 (SrCo 2 W) in the range 750 o C < T < 1150 o C. The SrCo 2 Fe 16 O 27 (SrCo 2 W) transforms into Sr 3 Co 2 Z in the range 1150 o C < T < 1250 o C.

关键词： Reaction process Z-type hexaferrite spintronics multiferroic

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Oxidation Behaviors of C-ZrB_2-SiC Composite at 2100℃ in Air and O_2

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Journal of materials Science & technology 2014年第12期30卷 1223-1229页

作者： Zhongwei Zhang Cewen Nan Jingjun Xu Zenghua Gao Meishuan Li Junshan Wang State Key Laboratory of New Ceramics & Fine Processing Department of Materials Science and Engineering Tsinghua University Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Institute of Metal Research Chinese Academy of Sciences

The oxidation behaviors of graphite and ZrB2-SiC modified graphite composite were investigated at 2100℃ in1X105 Pa air and 0.2X105 Pa O2. The oxidation tests were conducted in an induction heating furnace. The oxidation of these two materials followed the linear rate law. The determined radius loss rates of graphite and C-ZrB2-Si C at 2100℃ were 2.18X10-2and 1.05X10-2%/s in 1X105 Pa air, and 3.23X10 2 and 2.21X10 2%/s in 0.2X105 Pa O2, respectively. The incorporation of ZrB2 and SiC decreased remarkably the oxidation rate of graphite because the oxide scale formed on the sample surface during oxidation helps in reducing the exposed surface area of the underneath substrate. In two different atmospheres with the same oxygen partial pressure, both graphite and ZrB2-SiC experienced more severe oxidation at 2100℃ in0.2X105 Pa O2than in 1X105 Pa air. The oxidation rate-controlling step for graphite and ZrB2-SiC was proposed to be the inward diffusion of oxygen through the boundary layer and through the pores in the oxide scale, respectively. A model based on diffusion theory was established to discuss the effect of the total gas pressure on their oxidation behaviors.

关键词： Graphite-based composite Ceramic particles Ultra-high temperature oxidation Oxide scale Oxidation mechanism

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Two competitive nucleation mechanisms of calcium carbonate biomineralization in response to surface functionality in low calcium ion concentration solution

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Regenerative Biomaterials 2015年第3期2卷 187-195页

作者： Hua Deng Shuo Wang Xiumei Wang Chang Du Xingcan Shen Yingjun Wang Fuzhai Cui State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Chemistry and Biochemistry Jackson State UniversityJacksonMS 39203USA School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources School of Chemistry and Chemical EngineeringGuangxi Normal UniversityGuilin 541004China

Four self-assembled monolayer surfaces terminated with–COOH,–OH,–NH_(2)and–CH_(3)functional groups are used to direct the biomineralization processes of calcium carbonate(CaCO_(3))in low Ca^(2+)concentration,and the mechanism of nucleation and initial crystallization within 12 h was further ***-COOH surface,nucleation occurs mainly via ion aggregation mechanism while prenucleation ions clusters may be also ***-OH and-NH_(2)surfaces,however,nucleation forms via calcium carbonate clusters,which aggregate in solution and then are adsorbed onto surfaces following with nucleation of amorphous calcium carbonate(ACC).Furthermore,strongly negative-charged-COOH surface facilitates the direct formation of calcites,and the-OH and-NH_(2)surfaces determine the formation of vaterites with preferred crystalline *** ACC nor crystalline CaCO_(3)is observed on-CH_(3)*** findings present a valuable model to understand the CaCO_(3)biomineralization pathway in natural system where functional groups composition plays a determining role during calcium carbonate crystallization.

关键词： calcium carbonate biomineralization self-assembled monolayer prenucleation clusters ions adsorption

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Strain-modulated transport properties of Cu/ZnO-nanobelt/Cu nanojunctions

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Physica Status Solidi (B) Basic Research 2015年第8期252卷 1767-1772页

作者： Sun, Xu Gu, Yousong Wang, Xueqiang Zhang, Zheng Zhang, Yue School of Materials Science and Engineering University of Science and Technology Beijing Beijing China State Key Laboratory for Advanced Metals and Materials Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing100083 China

The transport properties of Cu/ZnO-nanobelt/Cu nanostructures under uniaxial strains were studied using first-principles calculations, with emphasis on the interfacial contacts. The conductivity G is very sensitive to strain, and it decreases linearly when strain varied from compression to tension, and the piezoresistive gauge factors (GFs) of ZnO nanobelts in non-polarized direction are 5.66 and 4.29 for compressive (Ε{lunate}=-0.05) and tensile strain (Ε{lunate}=0.05), respectively. As shown in local density of states (LDOS), the number of carriers nearby the Fermi level decreased obviously when the strains changed from compression to tension, which could be used to explain the linearly decreased conductance. In terms of the transferred interfacial charge and potential profiles, the energy barriers between Cu and ZnO nanobelts could be reduced by strains. These results could help to understand the physics in the strain-induced metal/ZnO contacts and be used to modulate effectively the performances of ZnO nanodevices. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Zinc oxide

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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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Surface Passivation of Nanocrystalline Silicon Powder Derived from Cryomilling

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Journal of Wuhan University of technology(materials Science) 2014年第1期29卷 65-69页

作者：王志浩 HUANG Zhifeng 陈斐 SHEN Qiang ZHANG Lianmeng State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Laboratory of Advanced Technology for Specially Functional Materials Ministry of Education Wuhan University of Technology

The surface passivation mechanism of nanocrystalline silicon powder was studied. The liquid nitrogen/argon was used as the medium to prepare the nanocrystalline silicon powder, using a cryomilling technology. The X-ray diffraction, transmission electron microscopy, plasma emission spectroscopy and infrared spectrum were used to analyze the prepared samples, and density functional theory was used to investigate the cryomilling process. For nanocrystalline silicon powder cryomilled with liquid N2, the amorphous outer layer with N element is formed On the surface, and chemisorption caused by the formation of Si-N-Si bond leads to the surface passivation; although physisorpfion also he confirmed, the Si-N bond is steady after exploded in air for 30 days and no new bond is observed. For nanocrystalline silicon powder cryomilled with liquid At, no new chemical bond is Observed, Ar element absorbs on the surface of the prepared powder only through physisorption, and after exploded in air for 30 days, a Si-O bond can be observed obviously.

关键词： surface passivation nanocrystalline silicon powder cryomilling

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