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Ultrastrong MXene film bridged by liquid metal

Science China materials 2024年第12期67卷 4115-4116页

作者： Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Two-dimensional(2D)titanium carbide(Ti_(3)C_(2)T_(x))MXene nanosheets show promising mechanical and electrical properties,indicating great potential applications in aerospace and electronic devices,etc.[1,2].There are many assembling approaches including vacuum filtration,blade coating and layer-by-layer[3–5].However,it still remains a great challenge to realize the intrinsic performance of MXene nanosheets into macroscopic film due to low stress transfer efficiency,which usually is indued by the voids and misalignment during the assembling process[6].Thus,it remains a great challenge to assemble MXene nanosheets into high-performance macroscopic MXene films.

关键词： carbide coating film

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Preparation and characterization of new microwave dielectric ceramics Ba_(3-n)La_(1+n)Ti_nNb_(3-n)O_(12)

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中国有色金属学会会刊：英文版 2006年第B02期16卷 521-523页

作者：方亮孟森森张辉吴伯麟 Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of Education Guilin University of TechnologyGuilin 541004China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China 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 430070China Key Laboratory of Nonferrous Materials and New Processing Technology Ministry of Education Guilin University of Technology Guilin 541004 China

A series of new microwave dielectric ceramics Ba3-nLa1+nTinNb3-nO12 (n=0,1,2) were prepared in the BaO-La2O3-TiO2-Nb2O5 system by high temperature solid-state reaction route. The phase and structure of the ceramics were characterized by X-ray diffraction, scanning electron microscope, and microwave dielectric properties measurements. These samples were identified as single phase and adopted A4B3O12-type cation-deficient hexagonal perovskite structure, which can be described as consisting of identical perovskite-like blocks, three corner-sharing BO6 octahedra thick, separated by layers of vacant octahedral. These ceramics have high dielectric constants in the range of 48-42, high quality factors (Q×f) up to 38 000 GHz, and low temperature coefficient of resonant frequencies (τf) in the range of (-40-+6)×10-6℃-1. With increasing content of La and Ti, the dielectric constants slightly decrease butτf gradually increases.

关键词：微波陶瓷介电性质 Ba3-nLa1+nTinNb3-nO12 BaO-La2O3-TiO2-Nb2O5 制备

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Vacuum Infusion Molding Process Part 1:VIMP Based on a High-Permeable Medium

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Journal of Wuhan University of technology(materials Science) 2003年第3期18卷 72-75页

作者：祝颖丹 State Key Lab of Materials Synthesis and Processing Wuhan University of Technology

The visualization experiments were carried out to investigate the permeability of the high permeable medium (HPM) and the roles of the peel ply and the HPM in the mold *** influence of process parameters on mold filling is ***,the whole vacuum infusion molding process (VIMP) procedure is introduced in detail taking the manufacture of a model boat for example.

关键词： vacuum infusion molding process high permeable medium permeability mold filling

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Regulating electron transfer through imine linkage orientations in two-dimensional covalent organic frameworks for efficient electrochromism

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Chemical Engineering Journal 2025年 516卷

作者： Wenping Shi Jing Zhou Yuli Xiong Wen Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 PR China

Two-dimensional covalent organic frameworks (2D-COFs) based on imine linkages have been shown to offer intriguing optical and electrochromic (EC) performance, attracting extensive attention in the field of advanced photo-electrochemistry. However, few studies have explored how the orientation of imine linkages in 2D-COFs regulates electron transfer behavior and subsequently affects EC performance. In this work, we report an isomeric pair (Py-C-TP-COF and Py-N-TP-COF), differing only in the orientations of the imine linkages. Experimental and theoretical results demonstrate that significant differences in the electronic orbital contributions and bandgaps of 2D-COFs with distinct imine linkage orientations. Furthermore, the different orientations of imine linkages play a crucial role in the distribution of the highest occupied and the lowest unoccupied molecular orbital (HOMO and LUMO), thus significantly influencing electron separation and charge transfer. This approach of altering imine linkage orientations allows for the fine control of the charge transport and band structure of the 2D-COFs. As a result, the Py-C-TP-COF film exhibits excellent EC performance with high coloration efficiency (η CE ,1316 cm 2 ·C -1 ), fast switching time (2.0/0.4 s) and outstanding cycling stability (99.5 % retention of EC cyclic stability after 150 cycles). This study provides new insights for further rational design and optimization of functional COFs as EC materials with atomically regulated charge transfer.

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Electrorheological Particles Composed of Polyaniline Core and BaTiO_3 Layer Shell

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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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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 availab.e 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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