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Effects of PSMA and experimental conditions on the morphologies of BaCO_3 whiskers

Rare Metals 2006年第4期25卷 382-388页

作者： CHENG Bei YU Xiaoxiao YU Jiaguo ZHAO Xiujian State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

BaCO3 whiskers exhibiting different morphologies were fabricated by a simple precipitation reaction of barium ch/oride with sodium carbonate in the absence and presence of poly-（styrene-alt-maleic acid）（PSMA） as a crystal growth modifier at room temperature. The as-prepared products were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and X-ray diffraction （XRD）. The influences of experimental parameters on the size and morphology of BaCO3 whiskers were investigated and discussed. It was found that the as-prepared BaCO3 whiskers are single crystals with diameter ranging from 100 to 300 run, and grow along the crystallographic a-axis or [100] direction. BaCO3 whiskers with different morphologies, such as branching and dendritic structure, can be obtained depending on the experimental conditions. With increasing PSMA concentration, the diameter of BaCO3 whiskers decreases.

关键词： BaCO3 whiskers morphological control poly-（styrene-alt-maleic acid） single crystal

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Cytocompatibility Evaluation of Grafted IKVAV PLEOF Hydrogels with Bone Marrow Mesenchymal Stem Cells

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Journal of Wuhan University of technology(materials Science) 2014年第4期29卷 824-831页

作者：李宾斌 ZHANG Ping YIN Yixia QIU Tong TAO Yuan WANG Xinyu 李世普 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and Biomaterials Science and Engineering Research Center Wuhan University of Technology

The novel hydrogels-grafted IKVAV poly（lactide-co-ethylene oxide-co-fumarate）（PLEOF） hydrogels（GIPHs） were developed. The rat bone marrow mesenchymal stem cells（BMMSCs） were employed, and the cell vitality and apoptosis assays were carried out to evaluate the cytocomptibility of GIPHs. Our data demonstrated that the infl uence of GIPHs on the proliferation of BMMSCs was in a concentration and time dependent manner. The proliferative ability of BMMSCs in GIPHs-treated group（100 μg/mL） after 72 h presented a maximum response which was 30.1% more than that of control group. The numbers of apoptotic cells in GIPHs-treated group（100 μg/mL） were just as much as that of control group after 24 h treatment. The GIPHs are able to provide an appropriate environment for BMMSCs survival and proliferation.

关键词： proliferation IKVAV hydrogels vitality apoptosis

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Preparation and Microstructure of Porous ZrB_2 Ceramics Using Reactive Spark Plasma Sintering Method

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Journal of Wuhan University of technology(materials Science) 2015年第3期30卷 512-515页

作者：袁辉平李俊国 SHEN Qiang ZHANG Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Beijing Glass Research Institute

Zirconium oxide （ZrO：） and boron carbide （B4C） were added to ZrB2 raw powders to prepare ZrB2 porous ceramics by reactive spark plasma sintering （RSPS）. The reactions between ZrO2 and B,C which produce ZrB2 and gas （such as CO and B2O3） result in pore formation. X-Ray Diffraction results indicated that the products phase was ZrB2 and the reaction was completed after the RSPS process. The porosity could be controlled by changing the ratio of synthesized ZrB2 to raw ZrB2 powders. The porosity of porous ceramics with 20 wt% and 40 wt% synthsized ZrB2 are 0.185 and 0.222, respectivly. And dense ZrB：SiC ceramic with a porosity of 0.057 was prepared under the same conditions for comparison. The pores were homogeneously distributed within the microstructure of the porous ceramics. The results indicate a promising method for preparing porous ZrB：based ceramics.

关键词： zirconium diboride porous ceramic reactive spark plasma sintering

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Bias Voltage Controlled Inversions of Tunneling Magnetoresistance in van der Waals Heterostructures Fe3GaTe2/hBN/Fe3GaTe2

arXiv

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arXiv 2025年

作者： Zhang, Lihao He, Miao Wang, Xiaoyu Zhang, Haodong Han, keying Liu, Yonglai Zhang, Lei Cheng, Yingchun Pan, Jie Qu, Zhe Wang, Zhe MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Materials and Mesoscopic Physics School of Physics Xi’an Jiaotong University Xi’an710049 China Anhui Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field Laboratory Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China Science Island Branch of Graduate School University of Science and Technology of China Hefei230026 China State Key Lab of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China Key Laboratory for Microstructure Material Physics of Hebei Province Yanshan University Qinhuangdao066004 China

We report the bias voltage-controlled inversions of tunneling magnetoresistance (TMR) in magnetic tunnel junctions composed of Fe3GaTe2 electrodes and hBN tunneling barrier, observed at room temperature. The polarity reversal of TMR occurs consistently at around 0.625 V across multiple devices and temperatures, highlighting the robustness of the effect. To understand this behavior, we developed a theoretical model incorporating spin-resolved density of states (DOS) at high energy levels. By adjusting the DOS weighting at different k-points to account for misalignment between the crystal structure of electrodes in experimental devices, we improved agreement between experimental and theoretical inversion voltages. Our results provide valuable insight into the voltage-controlled spin injection and detection in two-dimensional magnetic tunnel junctions, with implications for the development of energy-efficient spintronic devices. © 2025, CC BY.

关键词： Van der Waals forces

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Heterogeneous Acid Catalytic Esterification by Porous Polyoxometalate-tantalum Pentoxide Nanocomposites

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Journal of Wuhan University of technology(materials Science) 2013年第3期28卷 580-585页

作者：许蕾蕾 GUOYihang MA Huiru 官建国 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Chemistry Northeast Normal University

Polyoxometalates （POMs） are useful catalysts in both redox and acid catalysis reactions since its catalytic features can be controlled at a molecular level. We investigated POM （POM = H3PW12040） on tantalum pentoxide （Ta2O5） via hydrolysis of tantalum pentachloride （TaCl5） in the presence of POM using the sol-gel method for acid catalytic reaction. All obtained amorphous materials have been characterized by inductively coupled plasma atomic emission spectroscopy （ICP-AES）, Fourier transform infrared （FT-IR） spectra, Raman scattering spectroscopy, 31P magic-angle spinning （MAS） NMR, field emission scanning electron microscopy （FESEM）, and nitrogen adsorption/desorption analysis, in order to confirm the structure integrity of the Keggin unit in as-prepared composites and investigate the morphology and surface textural property of the composites. Catalytic activity of the catalysts has been evaluated for esterification of acetic acid with ethanol as a model reaction with different catalytic reaction parameters such as POM loading, reaction time, catalyst dose, molar ratio of the reactants, etc. The conversion of ethanol reached 87.4 % and the turnover frequency （TOF） was 2.9x ***, it is easy to separate and recover POM/Ta205 from the reaction system.

关键词： esterification polyoxometalate tantalum pentoxide sol-gel porous mataterials

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Preparation of layered oxide Li(Co_(1/3)Ni_(1/3)Mn_(1/3))O_2 via the sol-gel process

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Rare Metals 2008年第2期27卷 158-164页

作者： ZHANG Wen LIU Hanxing HU Chen ZHU Xianjun LI Yanxi State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

To obtain homogenous layered oxide Li（Co1/3Ni1/3Mn1/3）O2 as a lithium insertion positive electrode material, the sol-gel process using citric acid as a chelating agent was applied. The material Li（Co1/3Ni1/3Mn1/3）O2 was synthesized at different calcination temperatures. XRD experiment indicated that the layered Li（Co1/3Ni1/3Mn1/3）O2 material could be synthesized at a lower temperature of 800℃, and the oxidation state of Co, Ni, and Mn in the cathode confirmed by XPS were ＋3, ＋2, and ＋4, respectively. SEM observations showed that the synthesized material could form homogenous particle morphology with the particle size of about 200 nm. In spite of different calcination temperatures, the charge-discharge curves of all the samples for the initial cycle were similar, and the cathode synthesized at 900℃ showed a small irreversible capacity loss of 11.24% and a high discharge capacity of 212.2 mAh·g^-1 in the voltage range of 2.9-4.6 V.

关键词： lithium-ion battery layered transition metal oxide sol-gel process high capacity

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Preparation of Layered Potassium Titanate Whiskers with Large Length-diameter Ratio by KDC Method

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Journal of Wuhan University of technology(materials Science) 2014年第4期29卷 669-673页

作者：吉晓莉 WU Shijiang 章嵩 ZHAO Xiujian State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

Pure K2Ti4O9 whiskers were prepared by KDC（Kneading-Drying-Calcination） method with TiO2 and K2CO3 as raw materials. The influences of TiO2/K2CO3 molar ratio（RT/K）, calcination temperature（TC） and cooling process on phase composition and morphology of the whiskers were investigated by TG-DSC（thermo gravimetric-differential scanning calorimeter）, XRD（X-ray diffraction）, and SEM（scanning electron microscope）. Pure K2Ti4O9 potassium titanate whiskers with large length-diameter ratio（r）（over 250） can be obtained at RT/K = 2.9 and TC = 950 ℃.

关键词： KDC（kneading-drying-calcination） method potassium titanate whiskers TiO2/K2CO3 molar ratio（RT/K） length-diameter ratio（r）

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Influence of pore size optimization in catalyst layer on the mechanism of oxygen transport resistance in PEMFCs

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Progress in Natural Science:materials International 2020年第6期30卷 839-845页

作者： Shumeng Guan Fen Zhou Jinting Tan Mu Pan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Provincial Key Laboratory of Fuel Cells Wuhan University of Technology

In PEMFC, the oxygen transport resistance severely hinders the cell from achieving high performance. In this paper, pore-forming agent was used to optimize the pore size distribution of the catalyst layer(CL), and to study its effect on the mechanism of oxygen transport resistance, including molecular diffusion resistance, Knudsen diffusion resistance, and local O2resistance in CL. The results showed that with the pore formation the cell performance had a significant improvement at high current density, mainly due to its better oxygen transport properties, especially under low platinum conditions. The addition of pore-forming agent moved the pore diameter toward a larger pore diameter with a range from 70 to 100 nm, and also obtaining a higher cumulative pore volume. It was found that the increase of the cumulative pore volume and larger pore size were conducive to the diffusion of oxygen molecules in CL, and the resistance caused by which was the dominant part in total transport resistance. Further tests indicated that the improvement of molecular diffusion resistance was much larger than that of Knudsen diffusion resistance in the catalyst layer after pore formed. In addition, the optimized pore structure will also get a higher number of effective pores, which resulted in an increased effective area of the ionomer on the Pt surface. The higher effective area of the ionomer was particularly beneficial for the reduction of local O2resistance with low Pt loading.

关键词： Pore size optimization Pore-forming agent Oxygen transport resistance PEMFC

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Effect of Particle Size on Silicon Nitride Ceramic Slurry by Stereolithography

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Journal of Wuhan University of technology(materials Science) 2023年第3期38卷 514-519页

作者：汪春柳 ZHANG Jinyong 雷丽文 School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070China

The effects of particle size,gradation and solid loading of silicon nitride (Si_(3)N_(4)) on the rheological behavior and curing properties of ceramic slurry are studied by stereolithography (SLA).The results show that the particle size of Si_(3)N_(4) powder has a signif icant influence on the rheological properties and stability of the *** m_(D50=1.3μm):m_(D50=2.3μm)=3:7,the slurry viscosity is low and the sedimentation is *** most important thing is that with the increase of the solid loading of the slurry,the viscosity of the slurry increases,the stability becomes higher,and the curing thickness *** curing thickness of Si_(3)N_(4) ceramic slurry with solid loading of 50 vol% can reach nearly 50μ*** above results finally show that the process optimizes the formulation of the slurry in rheological and curing properties.

关键词： silicon nitride stereolithography dispersion stability

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Functionalized carbon nanotubes interconnected with metal-organic frameworks for in-situ solar-driven evaporation and salt recovery from seawater

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Water Research 2025年 282卷 123643页

作者： Asghar, Muhammad Sohail Irshad, Muhammad Sultan Arshad, Naila Huwayz, Maryam Al Alomar, Muneerah Maqsood, Ghazala Ali, Muhammad Atif Ghanzanfar, Uzma Sabir, Muhammad Li, Jinhua Dao, Van-Duong Ho, Nang Xuan Wang, Xianbao Guo, Zhiguang Ministry of Education Key Laboratory of Green Preparation and Application for Functional Materials School of Materials Science and Engineering Hubei University Wuhan430062 China Ministry of Education Key Laboratory of Green Preparation and Application for Functional Materials School of New Energy and Electrical Engineering Hubei University Wuhan430062 China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics Shenzhen University Shenzhen518060 China Department of Physics College of Science Princess Nourah bint Abdulrahman University P. O. Box 84428 Riyadh11671 Saudi Arabia Department of Physics University of Wah Wah Cantt47040 Pakistan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Faculty of Biotechnology Chemistry and Environmental Engineering Phenikaa University Hanoi100000 Viet Nam Faculty of Vehicle and Energy Engineering PHENIKAA University Hanoi Viet Nam

Innovative solutions are needed to meet global water demand and to ensure the sustainable management of saline water resources. Indeed, solar-driven interfacial evaporation systems hold great environmental significance as they offer a sustainable and eco-friendly solution to several pressing issues. Herein, a 3D umbrella-shaped hybrid solar evaporator is innovatively developed by functionalized carbon nanotubes interlinked with metal-organic framework (MOF) nanocubes ZIF-67@CNT is sequentially anchored on cotton fabric with a centralized water supply. Combining these two materials results in a remarkable synergy, where the MOFs may trap and release water molecules (5.75 gg-1), and the CNTs facilitate broadband solar absorption (95 %). The hybrid solar evaporator endows solitary heat accumulation (49.5 °C) under 1k Wm-2 solar irradiance owing to its effective thermal management supported by centralized wicks-inspired water supply as compared to the conventional direct contact structures. More importantly, an efficient evaporation rate (2.1 kg m-2 h-1) was achieved, along with 99.9 % rejection efficacy and sustained reproducibility under natural conditions. Meanwhile, the system effectively concentrates and recovers salts from the brine stream, reducing waste and minimizing environmental impact. The sustainable utilization of solar energy reduces the energy cost associated with desalination, contributing to the economic viability of this technology. © 2025 Elsevier Ltd

关键词： Seawater

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