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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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Effect of nanocomposite structure on the thermoelectric properties of 0.7-at% Bi-doped Mg_2 Si nanocomposite

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Chinese Physics B 2011年第10期20卷 355-361页

作者：杨梅君沈强张联盟 Centre for Materials Research and Analysis Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Nanocomposites offer a promising approach to the incorporation of nanostructured constituents into bulk thermo- electric materials. The 0.7-at% Bi-doped Mg2Si nanocomposites are prepared by spark plasma sintering of the mixture of nanoscale and microsized 0.7-at% Bi-doped Mg2Si powders. Microstructure analysis shows that the bulk material is composed of nano- and micrograins. Although the nanograin hinders electrical conduction, the nanocomposite struc- ture is more helpful to reduce thermal conductivity and increase the Seebeck coefficient, hence improving thermoelectric performance. A dimensionless figure of merit of 0.8 is obtained for the 0.7-at% Bi-doped Mg2Si nanocomposite with 50-wt % nanopowder, which is about twice larger than that of the sample without nanopowder.

关键词： intermetallic compounds nanostructures semiconductors thermoelectric effects

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First-principles study on Pr-doped Bilayer Nickelate La3Ni2O7

arXiv

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arXiv 2025年

作者： Huo, Zihao Zhang, Peng Shi, Haoliang Yan, Xiaochun Duan, Defang Cui, Tian Key Laboratory of Material Simulation Methods & Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi’an Jiaotong University Xi’an710049 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo315211 China

Recently, the Pr-doped Ruddlesden-Popper phase of bilayer nickelate La3Ni2O7 has been reported to exhibit a superconducting transition temperature (Tc) of 82.5 K and superconducting volume fraction of about 57 % at high pressure. However, the effect of Pr-doping on La3Ni2O7 remains unclear. Here, we studied the crystal structures and electronic properties of Pr-doped La3Ni2O7 at 0 and 15 GPa based on the first-principles calculations to explore the doping effect of Pr. Our findings indicate that the praseodymium atoms prefer to occupy the outer La-O layers site. We then investigated the evolution of crystal structures in both the ambient pressure phase and high pressure phase of La3Ni2O7 as a function of doping concentration, revealing inconsistent trends in their evolution with increasing doping levels. Finally, by fitting the bilayer two-orbital model, we propose that doping Pr may benefit for superconductivity of La3Ni2O7. These results not only can help the further experimental search of RP phase nickelate at lower pressure, but also provide helpful guide for understanding the effect of chemical pressure in isovalent doped RP phase nickelate superconductor. Copyright © 2025, The Authors. All rights reserved.

关键词： Superconducting transition temperature

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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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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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Sandwich-Structured Composite Based on Performance-Differentiated Phase Change materials for Versatile Thermal Management

SSRN

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SSRN 2025年

作者： Wang, Zihan Li, Xinze He, Chenbo Yang, Rui Yang, Mingyang Tang, Guihua Zhang, Hu Xie, Qi Sun, Jingjing Sun, Chencheng Li, Junning MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an710049 China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong University Xi’an710049 China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing100076 China

Improving thermal management materials is crucial for achieving multifunctional integrated applications and enhancing energy efficiency. Though phase change materials exhibit excellent thermal storage properties, the limited thermal conductivity has hindered widespread use in dynamic and complex thermal environments. To address these challenges, we proposed a novel sandwich-structured composite based on composite phase change materials (CPCMs) with gradient thermal conductivities. The composite incorporates n-octadecane/melamine formaldehyde resin microencapsulated phase change materials (MPCM) as the phase change component, with nanoporous silica aerogel (SA) and flake graphite (FG) serving as the thermal insulation skeleton and high-thermal-conductivity support material, respectively. Characterization results revealed that the prepared CPCMs exhibited excellent shape stability and mechanical strength. Specifically, the SA/PCM composite demonstrated an ultralow thermal conductivity of 0.0725 W·m−1·K−1 and a phase change enthalpy of 109 J·g−1. In contrast, the thermal conductivity of FG/PCM composites increased significantly to 0.48–2.934 W·m−1·K−1 with 10–50 wt% FG loading, reaching up to 13.5 times that of pure MPCM. Transient thermal shock and multidirectional non-uniform heat disturbance tests confirmed the exceptional thermal insulation and temperature regulation capabilities in complex environments. Furthermore, tests based on real outdoor temperatures demonstrated that rooms equipped with the sandwich composite maintained more stable indoor temperatures, with a single-day maximum indoor temperature reduction of 3.15 °C than that using pure aerogel. These findings highlight the significant potential of the proposed sandwich-structured composite for advanced thermal management applications. © 2025, The Authors. All rights reserved.

关键词： Thermal insulation

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Hierarchically porous materials:synthesis strategies and emerging applications

引用

Frontiers of Chemical Science and Engineering 2016年第3期10卷 301-347页

作者： Minghui Sun Chen Chen Lihua Chen Baolian Su State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Laboratory of Inorganic Materials Chemistry

Great interests have arisen over the last decade in the development of hierarchically porous *** hierarchical structure enables materials to have maximum structural functions owing to enhanced accessibility and mass transport properties,leading to improved performances in various *** porous materials are in high demand for applications in catalysis,adsorption,separation,energy and *** the present review,recent advances in synthesis routes to hierarchically porous materials are reviewed together with their catalytic contributions.

关键词： hierarchically porous materials synthesis application

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Effect of Trace V on the Microstructure and Properties of Al-Zn-Mg-Cu Alloys During Heat Treatments by Twin-Roll Casting

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JOM 2025年 1-13页

作者： Meng, Longzhou Xu, Yifei Tang, Hongqun Qian, Xiaoming Peng, Yan Wang, Zhaodong Li, Yong Jezierski, Jan National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi University Nanning China State Key Laboratory of Rolling and Automation Northeastern University Shenyang China Guangxi Advanced Aluminum Processing Innovation Center Co. LTD Nanning China Department of Foundry Engineering Silesian University of Technology Gliwice Poland

The impact of trace V on the microstructure and mechanical characteristics of the Al-Zn-Mg-Cu alloy produced by twin-roll casting has been examined. Following homogenization, AlZnMgCu, S-Al2CuMg, and Al7Cu2Fe were among the primary phases that remained after the majority of the eutectic structure dissolved. The impact of dispersoids on the mechanical characteristics and intergranular corrosion resistance were examined, along with the precipitation behavior and recrystallization of Al3Zr and Al21V2 in the alloy. The hardness and yield strength of the V-containing alloy increase after homogenization, rolling, solution, and aging treatment. This enhancement may be attributed to the fine Al3Zr and Al21V2 particles’ precipitation strengthening, which augmented the traditional η′ phase precipitation strengthening. With the addition of V, the aging treatment alloy’s intergranular corrosion resistance was enhanced since there were fewer high-angle grain boundaries.

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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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Fabrication and Property of SiC Ceramic with Large Thickness/Diameter Ratios

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Journal of Wuhan University of technology(materials Science) 2020年第3期35卷 506-513页

作者： TAN Lin HE Qianglong HU Lanxin TIAN Tian WANG Weimin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Silicon carbide ceramics with different thicknesses/diameter ratios were prepared by using ultra-fine silicon carbide powder with the sintering additives of 1.0 wt% boron and 1.5 wt% carbon. The influence of thickness/diameter ratio on the microstructure and density of SiC ceramics was investigated in detail. The experimental results show that the addition of boron and carbon sintering aids can promote the densification process of SiC ceramic, leading to the low sintering temperature and improve mechanical properties. At 1950 ℃, SiC ceramic with a density of 99% exhibits Young's modulus, hardness, and flexural strength of 476 MPa, 28.3 GPa, and 334 MPa, respectively. It is found that long holding time has a positive effect on the uniformity of the microstructure and density distribution of SiC ceramics with large thickness/diameter ratios. Additionally, the sintering additive of boron can solid-solve into SiC, and then facilitate the phase transformation of SiC to form 6H-SiC and 4H-SiC composite ceramics.

关键词： SiC large thickness/diameter ratios mechanical properties uniformity

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