JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Cheng Luo,Cong Li,Ke Cao,Junbao Li,Junhui Luo,Qinghua Zhang,QianQian Zhou,Fan Zhang,Lin Gu,Li Yang,Yichun Zhou
Yttrium tantalate (YTaO 4 ) is the next generation of higher service temperature thermal barrier coatings (TBCs) materials due to its smaller volume effect in phase change, lower thermal conductivity and unique ferroelastic domain structure. However, the low fracture toughness limits its application. We first characterized the diffraction patterns of variants, and two variants (M 1 and M 2 ) observed in transmission electron microscopy (TEM) results were determined from four possible variants by mechanical derivation. The role of Zr 4+ doping in ferroelastic toughening was explained in detail. With the increase of Zr 4+ doping concentration, the monoclinic angle β and the domain rotation angle α decrease, respectively. The spontaneous strain component and the principal strain in the main space also have a similar decreasing trend. The decrease of the ferroelastic domain inversion energy barrier is beneficial to the improvement of fracture toughness . Combining the results of Vickers indentation, we found that Zr 4+ could be enriched at the domain boundary to inhibit the generation of cracks. An appropriate amount of Zr 4+ is conducive to the improvement of fracture toughness, and the excessive Zr 4+ will reduce the fracture toughness due to the generation of by-product t -ZrO 2 . So, the optimal composition is Y 0.44 Ta 0.44 Zr 0.12 O 2 and the best fracture toughness (2.9–3.8MPa m 1/2 ) is equivalent to the commercial 8YSZ. This result will promote the application of a new generation of TBCs.
研究领域:
材料科学
·
表面工程
·
结构陶瓷
·
热障涂层技术
·
固态相变
·
力学性能
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Chabi Noël Worou,Jing Kang,Taofic Bacharou,Jimin Shen,Pengwei Yan,Arcadius Degan,Yingxu Gong,Razack Guene,Zhonglin Chen
A single dual thin-film titanium-zirconium as selective layers membrane for divalent and monovalent ions removal was fabricated. Both dioxide of titanium (TiO 2 ) and dioxide of zirconium (ZrO 2 ) have been co-deposited on an ultrafiltration polyacrylonitrile membrane using information given by scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDS). The important insights provided by SEM associated with EDS on the arrangement and potential functions of nanoparticles (NPs) due to their unambiguous chemical signal were used for characterization and modification of membrane surface at an atomic scale. Thus, a novel thin-film composite-nanofiltration membrane (TFC-NFM) has been performed for the first time. The new-born organic–inorganic membrane NF-TiZr exhibited excellent performance rejection towards monovalent ions and its rejection rate for multivalent ions reached 95%. The order of salts rejection was CaCl 2 > MgSO 4 ~ MgCl 2 > NaCl > Na 2 SO 4 . The permeate flux of the NF-TiZr membrane is as high as 58 L m –2 h –1 . 180 h-continuous exploitation of NF-TiZr showed a slight variation of permeate flux less than 1.2% and the salt rejection remained high than 92.5% at the end of the operation. To our best knowledge, it is the first time SEM was combined with EDS to help for optimal co-deposition of nanoparticles on the membrane surface. This study may provide useful insights to design next-generation NFMs.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
International Journal of Ceramic Engineering and Science
·
2023
·Vol. 5
·期 4
·e10181
·
IF 0
Hengchang Wang,Jie Xu,Mingyue Wei,Xuanyu Meng,Lang Lin,Xiaoying Feng,Feng Gao
Lanthanum zirconate (LZO) has high-temperature advantages, including a high melting point, low thermal conductivity, and high structure stability, which has the potential to be used in high-temperature thermal insulation field. However, low mechanical properties of LZO porous ceramics have limited further applications. In this work, LZO nanofibrous membranes were prepared by electrospinning, and the preparation parameters, including PVP content, spinning voltage, feeding rate, received distance, and the heating process, were investigated to optimize the microstructure of the nanofibrous membranes. The LZO nanofibrous membranes with a grain size of 34.5 nm displayed good morphology after calcining at 1000°C. The LZO fibrous membranes had a very low thermal conductivity of 0.0716 W/m·K at room temperature, showing excellent insulating performance. This work indicates that LZO nanofibrous membranes are promising candidate materials for thermal insulation applications.
研究领域:
材料科学
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纳米技术
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热工学
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yajuan Sun,Jingkui Qu,Qiang Guo,Jing Song,Guangye Wei,Xinguo Xi,Guihua Hou,Tao Qi
Zirconia fiber, with its resistance to ultra-high temperature, is irreplaceable in many applications. Herein, a technique combining the sol-gel method and electrospinning was used to fabricate uniform 1D zirconia nanofibers from zirconium polyacetate. A suitable heat treatment process was established, and the effects of spinning parameters and additives on the fiber morphology were investigated using XRD, SEM, TGA , and FTIR. The results showed that addition of silica effectively inhibited grain growth and reduced the grain size to 30–60 nm. By optimizing the electrospinning parameters and the sintering process , fine-grained tetragonal zirconia fibers of 400–700 nm diameter could be produced.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 34
·期 3
·e5454
·
IF 3.259
Ningbo Li,Yijun Wang,Feijun Liu,Xin Zhao,Xinhua Xu,Quan An,Keming Yun
An air-stable complex of zirconium (IV)-salophen perfluorooctanesulfonate ( 1 ) was successfully synthesized by reacting Zr (salphen)Cl 2 and C 8 F 17 SO 3 Ag. Complex 1 was characterized and studied by different techniques (NMR, IR, HRMS, TG-DSC, conductivity and acidity measurements), and was found to be air-stable, water tolerant, thermally stable and strongly Lewis-acidic. Complex 1 exhibited high catalytic efficiency for the synthesis of 3,4-dihydropyrimidin-2-(1H)-ones/thiones via the Biginelli reaction of aldehydes, 1,3-dicarbonyl compounds and urea/thiourea under solvent-free conditions. Furthermore, complex 1 could be reused 5 times with minimal changes in catalytic efficiency. Compared with previously reported methods, the important features of this protocol are the solvent-free conditions, the short reaction times, the wide substrate compatibility, the high efficiency and the good reusability.
研究领域:
化学
·
催化科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2020
·
IF 3.407
Y. Jiang,J. Hou,P. Huang,J. Li,E.H. Wu,Z. Xu,Q.S. Liu,Zhuoming Xie,Qianfeng Fang
Hybrid tungsten composites reinforced with zirconium carbide (ZrC) nanoparticles and tungsten fibers were developed by the conventional powder metallurgy process (ball-mill mixing of powders and fibers followed by spark plasma sintering). The synergistic and mutual influences of the fibers and nanoparticles on tungsten were investigated in tensile behavior and fracture-energy tests. Aided by the ZrC nanoparticles, up to 30% of the fibers could be embedded in the tungsten matrix. The fracture energy was maximized by co-introducing 0.2 wt% ZrC particles with 20 wt% short tungsten fibers. The fracture-energy enhancement of the short fibers is contributed by pseudo-toughness from the fiber–matrix interface, inherent toughness from the fibers themselves, and grain refinement (by 50%) of the tungsten matrix. The fracture energy of the composite is very sensitive to the ZrC content, because the two-way action of ZrC weakens the pseudo-toughness of the interface energy.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
POLYHEDRON
·
2021
·
IF 3.052
Zhao-Yang Liu,Ruo-Ming Tong,Xin Chen,Yu-Teng Zhang
An amino-functionalized Zr-based metal–organic tetrahedron (denoted as ZrT-1-NH 2 ) was synthesized under solvothermal conditions. In addition, the adsorption performances of ZrT-1-NH 2 for sulfachloropyridazine (SCP) from aqueous solution were investigated. Moreover, the experimental results revealed that ZrT-1-NH 2 has adsorption performance for SCP. The adsorption kinetic data were best fitted with the pseudo second order model. Furthermore, a plausible adsorption mechanism was proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2017
·Vol. 11
·期 6
·543-552
·
IF 0.975
Dong Kaijun,Zhang Jun,Luo Weimin,Su Lin,Huang Zhilin
A series of zirconium based catalysts were synthesized to study the transfer hydrogenation of biomass derived ethyl levulinate into γ-valerolactone (GVL) using lower alcohols as hydrogen donors. The essential textural and chemical characteristics of prepared samples were
identified by various techniques including SEM, XRD, NH3-TPD, TGA, CO2-TPD and nitrogen physisorption. Parameters such as hydrogen donor, catalyst type, temperature, stirring rate, and catalyst dosage were found to play a critical role in GVL production. A promising GVL
yield of 98.3 mol% with a highest GVL formation rate at 5239.4 μmol g–1
cat h–1 was obtained in isopropanol at 433 K over zirconium oxide derived from zirconyl nitrate. The recycling experiments revealed that the zirconium oxide catalyst
derived from zirconyl nitrate presented relatively satisfied performance and stability.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Hang Hu,Qiang Chen,Zhanjun Chen,Hongyu Chen
To solve the major problem of interfacial side reactions between LiMn 1.5 Ni 0.5 O 4 (LMNO) and liquid electrolyte at high voltages, zirconium phosphate (ZrP) wrapped cathode material LMNO@ZrP, with different aspect of ZrP in 2 wt% and 4 wt%, have been prepared by a hydrothermal method. In particular, we focus on the distribution of ZrP on the LMNO surface to find out the optimal coating material and amount. The effects of ZrP coating layer have been investigated by comparison of the properties of the ZrP coated LMNO (LMNO@ZrP) and pristine LMNO electrodes by several electrochemical characterizations. The electrochemical impedance spectroscopy results show that LMNO@ZrP-3M-2 electrode exhibits an improved electrochemical property of suppressing the impedance increase. In the cell life test, LMNO@ZrP-3M-2 electrode shows a high capacity retention of 94.6% after 200 cycles at 55 °C.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Xiaoxiao Xia,Meng Cao,Zhilu Liu,Wei Li,Song Li
The use of metal-organic frameworks (MOFs) for adsorption cooling has won increasing research interests due to their outstanding adsorption performance. Zr-MOFs with relatively stable water stability and distinct structure properties are potential adsorbents for cooling. In this work, three Zr-MOFs: UiO-66, UiO-67 and NU-1000 with varying pore sizes were synthesized, and their water and ethanol adsorption isotherms were measured. The specific cooling effects (SCE) and coefficient of performance (COP) of MOF/water and MOF/ethanol working pairs in adsorption cooling system (ACS) were evaluated by adsorption system modeling. The results revealed that the MOFs with small pores and low steps (P/P 0 ) (i.e. UiO-66) in isotherms are favorable for water working fluid, which can achieve high SCE and COP at relative low temperatures. In contrast, MOFs with large pores and suitable steps (i.e. NU-1000) is preferential for ethanol working fluid due to the high uptake. Although water working fluid generally exhibited higher SCE and COP than ethanol, MOF/ethanol outperformed MOF/water because the equivalent cooling performance can be achieved at low temperature as well as the high recycle stability of MOFs/ethanol working pairs.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
NUCLEAR ENGINEERING AND DESIGN
·
2020
·
IF 1.62
Shijiao Zhao,Jingtao Ma,Xuping Lin,Xing Cheng,Xingyu Zhao,Shaochang Hao,Ziqiang Li,Changsheng Deng,Bing Liu
Zirconia (ZrO 2 ) microspheres are of great interest as a surrogate precursor material for preparation of uranium nitride (UN) microspheres in High Temperature Reactor (HTR). However, the crystallite transformation of ZrO 2 microspheres in cooling process causes cracking of the microspheres. In our study, crack-free nanocrystalline ZrO 2 microspheres were obtained. The tetragonal phase was stabilized at room temperature without doping any stabilizing additives. Firstly, gel microspheres were prepared through internal gelation process. Subsequent heat treatment of gel microspheres in nitrogen was conducted. The effect of heat treatment was investigated by using simultaneous thermogravimetric analysis and differential scanning calorimetric analysis (TGA/DSC). By using X-ray diffraction (XRD), optical microscopy, and field-emission scanning electron microscopy (FE-SEM), the phase compositions, morphology and microstructures of the heat treated microspheres were characterized. The ZrO 2 microspheres treated at 800 °C exhibit room-stabilized tetragonal zirconia phase, with uniform size of 650 ± 15 μm, good sphericity of 1.02 ± 0.01, and relatively high crush strength 122.5 ± 13.8 N/sphere. Finally, a preliminary nitridation was conducted. Those room-stabilized tetragonal zirconia microspheres can be used as a good surrogate precursor for subsequent preparation of nitride microspheres.
研究领域:
材料科学
·
核能工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 42
·22297-22304
·
IF 8.867
Chao Yang,Yelong Zhang,Fan Lv,Chunfu Lin,Yao Liu,Kai Wang,Jianrui Feng,Xiaohong Wang,Yongjun Chen,Jianbao Li,Shaojun Guo
The ever-increasing power and energy demands for modern consumer electronics and electric vehicles are driving the pursuit of energy-storage technologies beyond the current horizon. Pseudocapacitive charge storage is one of the most effective and promising approaches to fill this technology gap, owing to its potential to deliver both high power and energy densities. Typically, titanium niobium oxides (TiNbxO2+2.5x (x = 2, 5 and 24)) with intrinsic pseudocapacitance, high safety and theoretical capacities of 388–402 mA h g−1 are recognized as promising anode materials for lithium-ion batteries. However, their poor conductivity and low Li+-ion diffusion coefficient are known to be the major hurdles limiting the full utilization of their pseudocapacitive effects, leading to their lackluster rate capabilities. Herein, we employ a facile electrospinning method to prepare one-dimensional hierarchically porous ZrNb24O62 nanowires (P-ZrNb24O62) with an ultra-large Li+-ion diffusion coefficient as a new intercalating pseudocapacitive material for boosting Li+-ion storage. The P-ZrNb24O62 exhibits excellent electrochemical performances, including a high reversible capacity (320 mA h g−1 at 0.1C), safe working potential (∼1.67 V vs. Li/Li+), high initial coulombic efficiency (90.1%), outstanding rate capability (182 mA h g−1 at 30C) and durable long-term cyclability (90.2% capacity retention over 1500 cycles).
研究领域:
材料科学
·
能源储存技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）