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Electrorheological Particles Composed of Polyaniline Core and BaTiO_3 Layer Shell

Journal of Wuhan University of technology(materials Science) 2002年第1期17卷 30-32页

作者：魏建红 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan

Composite particles consisting of polyaniline( PAn) core and barium tilanate ( BaTiO3) Layer shell were synthesized. The PAn-BaTiO3 composites particles were characterized with TEM and XRD. The dielectric behavior of particles was tested and the electrorhcologicak(ER) behavior of the suspensions of PAn/ BaTiO3 panicles in chlorinated paraffin oil with a 20vol % was investigated under DC electric field. The results show that the ER effect of composite particle is far stronger than that of pure polyaniline and barium titanate which mere synthesized by the stone method. pH and thickness of BuTiO3 have an important. influence on the ER effects.

关键词： polyaniline bariam titanate core-shell ER effects.

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

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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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Preparation of Nano-sized Zirconium Carbide Powders through a Novel Active Dilution Self-propagating High Temperature synthesis Method

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Journal of Wuhan University of technology(materials Science) 2015年第4期30卷 729-734页

作者：达奥运龙飞 WANG Jilin XING Weihong WANG Yang ZHANG Fan 王为民 FU Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Lab of New Processing Technology for Nonferrous Metals & Materials Ministry of Education China Guilin University of Technology

High quality nano-sized zirconium carbide （ZrC） powders were successfully fabricated via a developed chemical active dilution self-propagating high-temperature synthesis （SHS） method assisted by ball milling pretreatment process using traditional cheap zirconium dioxide powder （ZrO2）, magnesium powder （Mg） and sucrose （C12H22Oll） as raw materials. FSEM, TEM, HRTEM, SAED, XRD, FTIR and Raman, ICP- AES, laser particle size analyzer, oxygen and nitrogen analyzer, carbon/sulfur determinator and TG-DSC were employed for the characterization of the morphology, structure, chemical composition and thermal stability of the as-synthesized ZrC samples. The as-synthesized samples demonstrated high purity, low oxygen content and evenly distributed ZrC nano-powders with an average particle size of 50nm. In addition, the effects of endothermic rate and the possible chemical reaction mechanism were also discussed.

关键词： zirconium carbide ZrC self-propagating high-temperature synthesis active dilution nano-powders ball milling

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Combustion synthesis of TiB_2 Ceramics Powder from B_2O_3-TiO_2-Mg System in Air Atmosphere

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Journal of Wuhan University of technology(materials Science) 2005年第2期20卷 90-93页

作者：何金云王为民 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Prof

TiB_2 ceramics powder was synthesized from B_2O_3-TiO_2-Mg system. The effects of TiB_2 addition as diluent on the combustion synthesis process were investigated. The results of thermodynamic calculation and experiments show that the increase of TiB_2 content ranging from 0 to 20wt% can reduce the adiabatic temperature T_(ad) from 3100 K to 2896 K and combustion temperature T_c from 2139 K to 1621 K respectively. The particle size and half width of the particle distribution are also increased with the addition of TiB_2 increasing from 0 to 20wt%. The combustion product is a mixture of TiB_2, MgO, and other intermediate phases. The leached product contains mainly TiB_2, TiO_2 and TiN, and its oxygen content is 7.77wt%.

关键词： combustion synthesis B_2O_3-TiO_2-Mg TiB_2

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Three dimensional profile for the valence electronic structure across the triple pocket junction in SrTiO3 ceramic

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Journal of advanced Microscopy Research 2013年第2期8卷 128-136页

作者： Tan, Guo-Long State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The three dimensional profile for valence electron structure across the triple pocket junction in SrTiO3 ceramic has been quantitatively determined by analysis of spatially resolved low loss electron energy-loss spectroscopy (EELS) data, which were collected from one front grain across the triple pocket junction to another backside grain by line scan technique. From the experimental data, local complex dielectric functions were determined, from which interband transition strength Jcv spectra can be locally analyzed. A three dimensional surface profile of the interband transition strength spectra across the triple pocket junction has been built up, the front view of which looks like a valley with a horse-hump shaped grooving gap across the triple pocket junction (TPJ). The dramatic change of the valence electronic structure across the triple pocket junction has been observed. The transition strength between the energy range of two major transition peaks at 28.9 eV (F ) and 47.3 eV (H) drops dramatically across the triple pocket junction, a new transition peak E at 15.3 eV appears. This new feature was corresponding to the interband transition relative to one of the splitting O 2s sub-bands of TiO2. The bulk plasmon excitation peak for SrTiO3 disappeared at the central point of the triple pocket junction, where a new plasmon resonance peak at 24.6 eV for TiO2 shows up. The disappearance of peak H at 47.4 eV and the occurrence of a new peak E suggest that TiO2 be the only component at the central point of the triple pocket junction. Copyright © 2013 American Scientific Publishers.

关键词： Perovskite

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One-step preparation of porous aminated-silica nanoparticles and their antibacterial drug delivery applications

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Journal of materials Science & technology 2020年第15期47卷 139-146页

作者： Yongren Wu Shun Chen Yang Liu Zhiwei Lu Shaokun Song Yang Zhang Chuanxi Xiong Lijie Dong Center for Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan430070China

Porous functionalized silica nanoparticles have attracted the interest of researchers as they are excellent carriers for antibacterial drug delivery *** this work,porous aminated-silica nanoparticles(SiO2-NH2 NPs) were prepared via one-step approach through the ammonia-catalyzed hydrolysis of tetraethylorthosilicate(TEOS) and(3-aminopropyl) triethoxysilane(APTES) in a mixed water-ethanol *** obtained SiO2-NH2 NPs displayed a spherical morphology and relatively uniform size distribution,while the morphology and structure of SiO2-NH2 NPs were mainly determined by the order of the reagents added and the pH value of the *** characterization,the results showed that there were a large number of-NH2 groups on the surface of porous SiO2-NH2 NPs and that the porous SiO2-NH2 NPs had a large surface area of 476 m2 g-1 with an average pore width of 4.3 *** an absorbing-releasing experiment and bacterial test,those SiO2-NH2 NPs were found to exhibit efficient absorption and release of drugs as well as a pH-de pendent release pattern of epirubicin-loaded SiO2-NH2 ***,SiO2-NH2@capsaicin NPs exhibited antibacterial *** porous SiO2-NH2 NPs could be a candidate for drug delivery for antibacterial applications owing to their tailored porous structure and high surface area.

关键词： Porous aminated-silica nanoparticles Surface area Drug delivery Antibacterial property

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XRD and HRTEM Analyses of the Ball Milled Nanocrystalline FeCo Alloy

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Journal of Wuhan University of technology(materials Science) 2006年第1期21卷 68-71页

作者：王琦官建国 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070ChinaSchool of Materials Science and EngineeringJinan UniversityJinan 250022China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070China

The nanostractures of the ball milled FeCo particles were characterized as functions of the ball milling time （ t ） using quantitative X- ray diffraction （ XRD ）, high resolution transmission electron microscopy （HRTEM） analysis techniques. The results show that the nanocrystalliue bcc FeCo particles are available using carbonyl iron and cobalt powders as the start materials during the high-energy ball milling. At the early stage of ball milling, Co powders are easily mashed into nanocrystalllites, by which the surface of the larger Fe particles of about 80- 150 nm is coated. With t increasing, the refinement of grain size and the incorporation of defects including dislocations, disclinations and grain boundaries happen, and then FeCo alloy with a certain layered structure is formed, finally the layered stractare disappears with the formation of isotropic grains having a steadystate grain size in the nanometer regime after a certain period of t.

关键词： high energy ball milling carbonyl iron cobalt alloy nanocrystalline materials

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Study on the Pyrolysis Behavior of Polycarbosilane

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Journal of Wuhan University of technology(materials Science) 2015年第4期30卷 679-683页

作者：陈文怡 ZHOU Jian Materials Research and Testing Center Wuhan University of Technology State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The pyrolysis behavior of polycarbosilane （PCS） and chemical reaction mechanism during the pyrolysis process were studied by thermogravimetric-mass spectrometry （TG-MS） combined with X-ray diffraction and infrared spectroscopic analysis methods. The experimental results indicate that the main gas phase products generated during pyrolysis of PCS in nitrogen atmosphere include H2, -CH3 and CH4. The heating rate has a large effect on the pyrolysis process of PCS, the lower heating rate releases more small molecule gases and gets bigger rate of pyrolysis mass loss, demonstrating that the lower heating rate is beneficial to fully pyrolysis of PCS and obtain ceramics products with better microstructure.

关键词： polycarbosilane pyrolysis behavior thermogravimetric-mass spectrometry heating ratemass loss

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One-pot synthesis of Hollow Octahedral Cu_2O Nanostructures at Room Temperature

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Journal of Wuhan University of technology(materials Science) 2013年第1期28卷 40-43页

作者：雷丽文 ZHANG Qi ZHANG Yu ZHANG Jinyong WANG Hao FU Zhengyi State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Materials Science and Engineering Wuhan University of Technology

Homogeneous hollow Cu20 octahedral nanostructures have been fabricated by a facile onepot reduction reaction at roomtemperature. The microscope analysis revealed that the edges of as-prepared hollow structures were around 200 nm with a wall thickness of about 20 nm. To investigate the influence factors and formation mechanism of the hollow octahedral structure, samples subjected to different reaction conditions were studies. The results showed that the morphology and structures of Cu20 particles were greatly affected by the concentration of pH value of the reaction environment and the reaction time. Ostwald ripening process is orooosed to exolain the growth mechanism of the hollow octahedral nanostructures.

关键词： nanoparticles crystal growth octahedral hollow nanostructure

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Fabrication of Homogenous Dispersion TiB_2-Al_2O_3 Composites

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Journal of Wuhan University of technology(materials Science) 2011年第4期26卷 681-683页

作者：张金咏 State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

In order to get a homogenous mixture and compact of TiB2-Al2O3, hybridization as a surface modification method was used to prepare nano-scale Al2O3 coated TiB2 particles. PE-wax particles were first coated onto TiB2 particles by hybridization, and then the nano-scale Al2O3 particles were coated onto the surface of TiB2 coated by PE-wax particles again. SEM, TEM and EDS were used to characterize the microstructure of as-received core/shell particles and its compacts. The experimental results show that a particle-scale homogenous dispersion of TiB2 and Al2O3 can be formed not only in mixed powder but also in dewaxed compacts. The compacts then were sintered by gas-pressing sintering （GPS）. Finial products show improved mechanic properties comparing with reference samples fabricated by normal ways.

关键词： TiB2/Al2O3 hybridization dispersion

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