International Journal of Applied Ceramic Technology
·
2020
·Vol. 17
·期 5
·2094-2103
·
IF 1.762
Kangkang Yuan,Xiaotong Jin,Xinqiang Wang
In this work, MgO-ZrO 2 and MgO-6YSZ ceramic fibers were prepared with sol-gel method via electrospinning. Polymorph stability and microstructure evolution of zirconia fibers were fully characterized by X-ray diffraction, Raman spectra, X-ray photoelectron spectroscopy, and Scanning electron microscope. The results indicated that tetragonal zirconia for MgO-ZrO 2 was obtained and cubic zirconia could be fully stabilized for MgO-6YSZ with MgO molar fractions varying from 0.1 to 0.5 at 800°C. Monoclinic phase appeared with MgO molar fractions even up to 0.5 for MgO-ZrO 2 system and partially or fully stabilized zirconia could be achieved for MgO-6YSZ at 1000°C and 1200°C. Grain size was gradually decreased with increasing of MgO content at 800°C both for MgO-ZrO 2 and MgO-6YSZ ceramic fibers. The grain size of both systems increased with MgO molar fractions varying from 0.1 to 0.2 and then decreased at higher contents at 1000°C and 1200°C. A discussion on relationship among MgO state and the phase stability and grain size was presented. This work shows surface excess and solid solution of MgO predominantly controlled the phase stability and microstructure evolution of zirconia fibers.
研究领域:
材料科学
·
陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yilin Zhao,Shenghua Liu,Xiaoqian Feng,Jiaxin Wang,Lijiao Chen,Yonghua Zhao,Huan Wang,Qijian Zhang
Dry reforming of methane (DRM) is a promising pathway to convert greenhouse gas into syngas. However, the commonly used Ni based catalysts suffer deactivation due to severe sintering and coking. In this paper, a series of porous Ni/MgO-ZrO 2 catalysts (5Ni/xM(1-x)Z, x = 0, 20, 40, 60, 80 wt%, respectively) with high specific surface area were synthesized by a facile combustion method followed by incipient impregnation. It is found that the appropriate amount of MgO (40 %) addition in ZrO 2 favors high porosity and high specific area. More MgO enhances the basicity of the catalyst as well as the metal-support interaction (MSI) by the formation of NiO-MgO solid solution, thus improving DRM activity and coking resistance. However, excessive MgO addition leads to over-strong MSI and lower porosity, resulting in lower DRM activity. The catalyst with 40 % MgO addition (5Ni/40M60Z) exhibits the best activity (conversions of CH 4 ∼ 76 %, CO 2 ∼ 83 %) and stability (>50 h) at high GHSV = 96000 ml/g cat ·h and 750 °C. in situ DRIFTS reveals the mechanism that MgO addition improves DRM activity and stability. Compared with ZrO 2 where CO 2 adsorbs as monodentate carbonate, CO 2 tends to adsorb on 40 %MgO-60 %ZrO 2 as bidentate carbonate and then easily transfer to more stable intermediate bidentate formate, thus improving DRM activity and coking resistance. This study provides new insights on the role of Mg addition in Ni/MgO-ZrO 2 DRM catalysts.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yi Hu,Yuqiang Guo,Fenghua Zhao,Rui Zuo,Xugang Lu,Shibing Xiong,Ping Huang,Bangcheng Yang
In the field of hard tissue repair, titanium-based materials have excellent mechanical properties and magnesium-based materials have good bioactivity, but their shortcomings are that titanium-based materials do not have good bioactivity, while magnesium-based materials are limited in application due to their rapid degradation rate. In order to give full play to the advantages of these two materials, the TiO 2 –MgO composite ceramic materials were prepared by combining the two elements and sintering at high temperature. By changing sintering temperature and MgO content, the structure composition and bioactivity of composite ceramic materials can be controlled. The surface morphology , mineralization ability in vitro, cytotoxicity and bone-promoting properties of composite ceramic materials were studied. The experimental results show that high MgO content composite ceramic materials will bring too strong alkalinity to the environment, which will accelerate the mineralization ability of materials, but is not conducive to the survival of cells. Composite ceramic materials with suitable sintering temperature and MgO content have good bioactivity and bone-promoting performance, while the porous structure produced by MgO degradation is beneficial to cell spreading and can form a good combination between the material and bone tissue at an early stage. Porous structure and Mg 2+ can adjust the bone-promoting properties of materials together. Through the above experimental research, it is found that TiO 2 –MgO composite ceramic material is a new type of material which is used in the field of hard tissue repair due to its good bioactivity.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
高影响因子
POWDER METALLURGY AND METAL CERAMICS
·
2022
·Vol. 60
·期 11
·738-747
·
IF 0.913
Sun W.Z.,Huang Z.K.,Lu Y.J.,Liu L.M.,Xiao Z.
Preliminary experiments revealed solid-state reactions in the SiC–TiO 2 –MgO system that resulted in forming TiC compound, providing, thus, a new reaction system for the formation of TiC–SiC ceramic matrix composites. This system’s high-temperature physicochemical reaction and the phase equilibrium relations of TiC–SiC with salt compounds in the SiC–TiO 2 –MgO system will be examined in this paper. The obtained findings may significantly contribute to the composition of TiC–SiC ceramic composites. Solid-state reactions in the SiC–TiO 2 –MgO system were investigated during experimental procedures employing thermodynamic computing. Chemical kinetics of some reactions were highlighted and discussed, including mutual displacement reaction of SiC + TiO 2 = = TiC + SiO 2 to form TiC, the acid-based reaction of MgO with SiO 2 or TiO 2 to form Mg-silicates (Mg 2 SiO 4 , MgSiO 3 ) or Mg-titanates (Mg 2 TiO 4 , MgTiO 3 , MgTi 2 O 5 ), the reduction reaction of 2TiO 2 + C = Ti 2 O 3 + CO (g) with the involvement of excessive TiO 2 . The appearance of Ti 2 O 3 may also be due to significant surface defects of rutile TiO 2 (110) derived from its bulk Ti 3+ defects. However, Mg-silicates and Mg-titanates were not found in the design of the current SiC–TiO 2 –MgO system but the oxide design of the MgO–TiO 2 –SiO 2 system. As the SiC–TiO 2 –MgO ternary system was extended to the SiC–SiO 2 –TiC–TiO 2 –MgO quinary system, the phase relations form a combination of the TiC–SiC phase relations with all salts of the TiO 2 –MgO–SiO 2 system. Experiments confirmed the formation of TiC and its coexistence with SiC and all binary compounds of the TiO 2 –MgO–SiO 2 system, specifying an interaction in the SiC–SiO 2 –MgO–TiO 2 –TiC system. The phase relations of the quinary system were established, followed by constructing its phase diagram relations at 1400°C, which would be beneficial for the compositional design of TiC–SiC, TiC–ceramic, and SiC–ceramic composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Wang,Jin Wang,Junxia Wang,Xusheng Li,Yijie Tang,Nan Li
MgO-Nd 2 Zr 2 O 7 composite ceramic is a promising candidate as an inert matrix material for the transmutation of Pu and minor actinide. In this work, the MgO-Nd 2 Zr 2 O 7 composite ceramics (hereafter M-NZO) with 30–70 wt% mass percent of MgO were successfully prepared at 1500 °C for 24 h via direct solid-state reaction one-step method. This method achieved the integration of Nd 2 Zr 2 O 7 pyrochlore synthesis and M-NZO composites sintering, which shows a significant improvement in the simplification of the preparation process than the traditional two-step method. The structural properties and compactness of the as-prepared composite ceramics were systematically investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM). It was confirmed that the as-prepared M-NZO ceramics are composed of only crystalline MgO and Nd 2 Zr 2 O 7 phases, and the mass fractions of two phase are almost the same as the designed nominal chemical composition. The composite ceramics showed remarkable densification and the relative density is higher than 98.2%.
研究领域:
材料科学
·
核能工程
✓ 已验证
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Modong Jiang,Lijie Qu,Yuan Tao,Jincheng Ni,Yanlei Hu,Dong Wu,Jiaru Chu,Jiawen Li
Transparent ceramics face fabrication challenges in achieving high-resolution 3D architectures with optical isotropy and thermal/mechanical stability. While two-photon lithography (TPL) enables nanoscale 3D printing, existing inorganic TPL materials suffer from opacity, big shrinkage, and costly postprocessing. Here, we report a solvent-free, high-loading Mg-cross-linked photoresist for TPL fabrication of sub-200 nm 3D MgO transparent ceramics with high fidelity via two-step sintering. With a high-purity cubic lattice, defect-free and fully dense MgO structures exhibit a wide range of transparent thicknesses. Demonstrations include excellent optical imaging, focusing capabilities, and stable mechanical and optical durability of MgO under various harsh working conditions, like high temperature and high-energy laser radiation. This simple and relatively low-cost method also showcases a fiber-integrated micro-optic device for high-intensity laser systems. This synergy of nanoscale precision, wide-thickness transparency, and outstanding stability will position 3D MgO transparent ceramics as next-generation optical components to make micro-optical devices with high damage thresholds.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomaterials Science
·
2025
·
IF 5.7
Shu Sun,Jing Qin,Yifu Zhuang,Pengfei Cai,Xiao Yu,Hongsheng Wang,Xiu-Mei Mo,Jinglei Wu,Mohamed El-Newehy,Meera Moydeen Abdulhameed,Mingyue Fan,Wenhao Qian,Binbin Sun
Clinically, gingival tissue repair is challenging due to the complex oral microbial environment and inflammation. The development of gingival membranes using tissue engineering techniques offers a promising solution to this issue. This study focuses on developing the nanofibrous gingival membrane, combining polylactic acid (PLA), decellularized extracellular matrix (dECM), and magnesium oxide (MgO) nanoparticles. Electrospinning was used to fabricate membranes with varying ratios of PLA, dECM, and MgO, and their mechanical, antibacterial, and cell-proliferation properties were evaluated. NIH-3T3 and rat gingival fibroblasts (RGF) cells were cultured on the membranes to assess biocompatibility. A rat model with gingival defects was used to test in vivo tissue regeneration. It was indicated that the antibacterial nanofibrous membranes with MgO showed enhanced antibacterial effects, reduced inflammation, and promoted gingival tissue repair.
研究领域:
生物材料学
·
组织工程学
·
口腔医学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhidong Xia,Bin Meng,Heng Zhang,Qian Zheng,Wenke Liang,Xinyu Ping
Ce 0.8 Sm 0.2 O 1.9 (SDC)-xMgO (x = 0, 5, 10, 15, and 20 mol%) composite powders were synthesized by a sol-gel method and then densified by spark plasma sintering (SPS) to investigate the effects of MgO additions on the electrical conduction behavior of CeO 2 -based ceramics. The microstructure and electrical performances of the SDC-MgO composite ceramics were characterized and measured by XRD , SEM, TEM, EDS and EIS . Results show that the second phase of MgO segregates at the grain boundaries of SDC when its content is higher than 5 mol% in the ceramics. The SPS process accelerates the formation of MgO lamellar grains with incomplete crystallization. As the MgO content rises from 0 to 20 mol%, the grain boundary and total electrical conductivities first increase and then decrease, and the SDC-5%MgO sample exhibits the highest total conductivity, i.e., 2.76 × 10 −2 S/cm at 650 ° C, which is 9.65% higher than that of pure SDC.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Haipei Zhang,Bo Li,Yonggang Wei,Hua Wang,Yindong Yang
The cleaning of copper slag is an important way to realize the sustainable development of the copper metallurgy industry. MgO is a commonly used additive in the cleaning process and has an important impact on the physicochemical properties of copper slag. However, there are few studies on the mechanism of the phase transformation of the ISASMELT copper slag with different additive amounts of MgO. In this study, the mechanism of the phase transformation of copper slag with different additive amounts of MgO and the effect of MgO on the mass action concentration of slag component, physicochemical properties of copper slag and copper loss were elucidated. The results showed that when the MgO was added to copper slag, high melting point hortonolite was formed in the slag. When the additive amount of MgO was more than 4%, high melting point pleonaste was formed. With increasing MgO additive amount, the slag viscosity increased, and the silicate structure tended to be complex. Adding MgO to slag was not conducive to the recovery of matte from copper slag. The results provide a theoretical basis for selecting the most reasonable slag type in the cleaning process of ISASMELT copper slag and selecting the reasonable raw material in the ISASMELT process of copper concentrate.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Qiangqiang Zhu,Bin Wang,Tianwei Tan
For the effect of structural features on the catalytic performance of the conversion of ethanol and acetaldehyde to butadiene to be investigated, a series of MgO–SiO2 catalysts with different structural properties were synthesized by tuning the calcination temperature, investigated, and characterized. The best butadiene selectivity of 80.7% appears for the MgO–SiO2 catalyst calcined at 500 °C using a mixture of acetaldehyde/ethanol/water (22.5:67.5:10 wt %) as feed. Addition of the appropriate amount of water (10 wt %) improved butadiene selectivity by inhibiting the formation of 1-butanol and C6 compounds. Results from XRD, FT-IR, and 29Si MAS NMR indicate the generation of a significant amount of amorphous magnesium silicates along with few crystalline magnesium silicates for the catalyst calcined at 500 °C. XPS results indicate that it contains the lowest binding energies of both Si–O and Mg–O from Si–O–Mg bonds. For the catalysts calcined at low temperature (350 and 400 °C), more 1-butanol and C6 compounds formed, which are considered to be related to residual Mg(NO3)2. Additionally, more ethylene, diethyl ether, and butylene isomers were produced over the MgO–SiO2 catalyst calcined at 700 °C with the formation of forsterite Mg2SiO4. Further results from Fourier transform infrared spectroscopy after pyridine adsorption and CO2 temperature-programmed desorption show that the high catalytic performance is related to the presence of Lewis acidic sites and an intermediate number of basic sites.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 14
·期 2
·334-342
·
IF 5
Zhou Yang,Ru Wang,Hongji Liu,Zhou Chen,Xiaoli Hu,Limin Sun,Weikun Lai,Yunyun Dong,Weiping Fang,Xiaodong Yi
Selective hydrogenation is a significantly important catalytic process in many industrial processes, where Pd-based catalysts are the most commonly used. Herein, the surface properties of γ-Al2O3 were modified by the layered flower-like architectures of alkaline MgO using a simple hydrothermal method. Then, a series of Pd/Al2O3–MgO catalysts were prepared by an incipient wetness impregnation method for the selective hydrogenation of isoprene. The results showed that the Pd/Al2O3–0.12MgO catalyst exhibited superior catalytic performance with a high activity (93%) and high selectivity (99%) for the semi-hydrogenation products. Systematic studies have demonstrated that the support effect plays an important role in dispersing and stabilizing palladium particles. The reasons for the improved catalytic performance were attributed to the high dispersion of Pd nanoparticles, the changed electronic structure of Pd, and the strong interaction between Pd nanoparticles and supports. This work opens a simple route to regulate the electronic properties of active metal sites via support modification for selective hydrogenation reactions.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Le Zhang,Yong Liu,Jianlong Wang
The oxidation of ammonium (NH 4 + ) to dinitrogen (N 2 ) with high selectivity and high efficiency is still a challenge. Herein, a novel sunlight induced persulfate (PS)-based AOPs process (MgO/Na 2 SO 3 /PS/ hv ) was proposed by introducing solid base (MgO) and hydrated electron (e aq − ), to selectively oxidize NH 4 + to N 2 , with high selectivity and high efficiency at a wide range of pH value. The deprotonation of NH 4 + into NH 3 by MgO and the generation of •OH and SO 4 −• by PS activation were responsible for the high efficiency of NH 4 + oxidation. The buffering capacity provided by MgO to proton released from PS activation made the NH 4 + oxidation possible at a wide pH range. The e aq − from the Na 2 SO 3 / hv process was the main active specie to reduce NO 2 − and NO 3 − (NO x − ) into N 2 , responsible for high N 2 selectivity of NH 4 + oxidation. 100% NH 4 + could be oxidized within 30 min, and N 2 selectivity exceeded 96% at the initial pH range of 3–11 and the initial concentration of NH 4 + of 30 mg N/L. This work could offer an efficient AOPs process for selective NH 4 + oxidation, which is promising for the chemical denitrification of wastewater ….
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）