Frontiers of Materials Science
·
2023
·Vol. 17
·期 2
·1-10
·
IF 2.7
Liu Tianli,Zhang Jian,Xu Mingjie,Tian Chuanjin,Wang Chang-An
Sintering resistant noble metal nanoparticles are critical to the development of advanced catalysts with high activity and stability. Herein, we reported the construction of highly dispersed Pd nanoparticles loaded at the inner wall of ZrO 2 hollow spheres (Pd@HS-ZrO 2 ), which shows improved activity and thermal stability over references in the Pd-ZrO 2 (catalyst-support) system. Even after 800 °C high temperature calcination, the Pd nanoparticles and ZrO 2 hollow spheres did not undergo morphological changes. The Pd@HS-ZrO 2 manifests batter catalytic activity and thermal stability than the counterpart Pd/ZrO 2 catalysts. In comparison to Pd/ZrO 2 -800, Pd@ZrO 2 -800 exhibits a 25°C reduction in the temperature required for complete conversion of CO. The enhanced catalytic activity and thermal stability of Pd@HS-ZrO 2 can be attributed to the nanoconfinement effect offered by the 10 nm wall thickness of the ZrO 2 hollow spheres, which suppresses the coarsening of the Pd nanoparticles (active center for catalysis).
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Zhijian Li,Changhui Zhu,Haiyong Wang,Yuan Liang,Haosheng Xin,Song Li,Xiaohong Hu,Chenguang Wang,Qi Zhang,Qiying Liu,Longlong Ma
For the biomass catalytic valorization in the presence of a H2 atmosphere, large amounts of H2O and H2 are necessary to improve the processing efficiency, which resulted in the waste of such generous inputs. As a model reaction, the traditional hydrodeoxygenation of 5-hydroxymethylfurfural (5-HMF) selectively produces 2,5-dimethylfuran (2,5-DMF) under high pressure H2. Meanwhile, the water-gas shift reaction (WGSR) can counteract the harmful CO by simultaneously producing H2 from H2O. The hydrogenolysis of 5-HMF to 2,5-DMF produces H2O because of the hydroxyl group removal. Therefore, adding a trace amount of H2O to initiate 5-HMF hydrodeoxygenation coupled with WGSR to achieve H2O recycling in the reaction process is of great significance but extremely challenging. Herein, we reported a new process for the selective hydrodeoxygenation of 5-HMF to 2,5-DMF coupled with WGSR using a single catalyst, Au/ZrO2. A detailed study showed that the hydrogen species produced in situ by WGSR was used for 5-HMF hydrodeoxygenation to obtain 78.5% of 2,5-DMF yield. The H/H2O cycle in the coupling reactions exhibited a H2 utilization efficiency of 88.2%. Without using external H2, this work provided a new method for 5-HMF hydrodeoxygenation to 2,5-DMF triggered by WGSR and also showed the potential for application in H2O-saving conversion of cellulosic biomass with C–OH or C═O groups to value-added chemicals and fuels.
研究领域:
生物质催化转化
·
绿色化学
·
可再生资源利用
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Le Fu,Wenjun Yu,Bohan Wang
Ceramic sintering is an energy-consuming process. Reducing sintering temperature and shortening dwelling time are significant to the reduction of carbon footprint. It has been reported that utilizing mesoporous particles as raw powder for sintering is a promising strategy to achieve the above goal. The goal of this study is to verify if this strategy also works for the sintering of ZrO 2 –SiO 2 glass-ceramics. We synthesized mesoporous particles through a micelle-assisted co-precipitation process, followed by sintering by fast hot pressing (FHP) and pressureless sintering (PS) to obtain ZrO 2 –SiO 2 glass-ceramics. For comparison, solid particles without mesopores were synthesized by a sol-gel method and consolidated by the two sintering techniques. The densification behaviors of the two types of particles were comparatively investigated. Results showed that the mesopores collapsed at ∼850 °C during FHP due to the applied pressure, which resulted in a peak densification rate during the whole sintering process. The mesoporous particles (∼820 °C) had a lower densification starting temperature than that of the solid particles (∼910 °C). However, the mesoporous particles showed a longer densification process and a lower average densification rate than those of the solid particles. The samples sintered from mesoporous particles showed a heterogeneous microstructure, predominately consisting of ZrO 2 nanocrystallites embedded in a SiO 2 matrix, but in some regions ZrO 2 sub-microcrystallites were connected with each other by grain boundaries, without the presence of SiO 2 matrix. During PS, there was not significant differences in the densification between the mesoporous particles and the solid ones. These results demonstrated that the mesoporous particles did not show significant advantages over solid ones, in terms of the densification of ZrO 2 –SiO 2 glass-ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Xueqin Wang,Lvye Dou,Zhaoling Li,Liu Yang,Jianyong Yu,Bin Ding
Functional nanoparticles modified silica nanofibrous materials with good flexibility, a hierarchical mesoporous structure, and excellent durability would have broad applications in efficient removal of contaminants, yet have proven to be enormously challenging to construct. Herein, we reported a strategy for rational design and fabricating flexible, hierarchical mesoporous, and robust ZrO2 nanoparticle-embedded silica nanofibrous membranes (ZrO2/SiO2 NM) for phosphate removal by combining the chitosan dip-coating method with the electrospinning technique. Our approach allows ZrO2 nanoparticles to be in situ firmly and uniformly anchored onto SiO2 nanofibers to drastically enlarge the specific surface area and porosity of membranes. Therefore, the resultant ZrO2/SiO2 NM exhibited a prominent removal efficiency of 85% and excellent adsorption amount of 43.8 mg P g–1 membranes in 30 min toward phosphates. Furthermore, the removal performance toward different types of phosphates revealed that the resultant membranes also could be used to remove phosphates in detergent and fertilizer water samples. More importantly, the membranes with good flexibility could directly be taken out from solution after use without any post-treatment. Such a simple and intriguing approach for fabricating nanofibrous membranes may provide a new platform for constructing membranes with superb phosphate removal performance.
研究领域:
环境科学
·
纳米材料学
·
水处理技术
·
功能材料
·
污染控制
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Na Li,Yaru Peng,Zeng Chen,Wenjuan Xiong,Jiaqi Sun,Yiming Chen,Putao Zhang,Meiyue Liu,Shengjun Li
The electro-deoxidation of MgO does not proceed efficiently due to the electrical insulation properties of MgO and large molar volume of metallic magnesium. In this experiment, an attempt was done to prepare Mg-Zr alloy from their oxides using the method of electro-deoxidation. The electrochemical mechanism of the deoxidation process of MgO, ZrO 2 and MgO-ZrO 2 composite was studied through cyclic voltammetry using metallic cavity electrode (MCE). There was an intermediate phase (Zr 3 O) in the reduction process of ZrO 2 . The electro-deoxidation of MgO occurred for MgO-ZrO 2 composite in CaCl 2 -NaCl molten salt. Moreover, the electro-deoxidation of MgO was promoted by the addition of polyvinyl butyral (PVB). The formation of metal phase Mg was confirmed by XRD, EDS, Raman spectroscopy, and inductively-coupled plasma spectroscopy. The electro-deoxidation products showed significant differences with the concentration of PVB and the ratio between MgO and ZrO 2 . The electro-deoxidation of MgO and ZrO 2 was favorable when the PVB concentration was 5.0% (wt.%). Pure metal phase of Mg-Zr alloys was formed when the molar ratio of MgO and ZrO 2 was 1:2. The atomic fraction of Mg in the electrolytic product was ca. 28.0 mol.%. This work shows that MgO could be directly electro-deoxidized to Mg without the formation of intermediate phase oxide.
研究领域:
材料科学
·
冶金工程
·
无机化学
·
电化学
·
金属合金制备
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Lu Zhu,Yousen Zhu,Xuanru Ren,Ping Zhang,Jianghao Qiao,Peizhong Feng
MoSi 2 -MoB-ZrO 2 composite powders are one-step synthesized prepared by self-propagating high-temperature synthesis (SHS), which are further utilized to prepare the oxidation protective coatings by spark plasma sintering (SPS) method on molybdenum substrate. Microstructure and properties of the coatings were investigated and determined. Oxidation behavior of the coatings at high temperature was also studied. The results showed that the composite coating is dense and crack-free due to the addition of ZrO 2 , which is beneficial for the decrease of mismatch in coefficient of thermal expansion, and no void exists in the diffusion layer owing to the diffusion of Si, which is inhibited by adding MoB. Compared with the pure MoSi2 coating, the high hardness of the composite coating is enhanced by about 20% while the fracture toughness of the composite coating is improved by about 25%, which makes the occurrence of intergranular fracture , crack deflection and crack bridging. After oxidation at 1400 °C for 80 h, MoSi 2 coating failed while xMoSi 2 -MoB-3ZrO 2 (x = 3, 4, 5) composite coating still kept its protective effect. Only a little substrate is consumed during oxidation and improved oxidation resistance is gained by MoSi 2 -MoB-ZrO 2 composite coating. 3MoSi 2 -MoB-3ZrO 2 coating shows the relatively best oxidation resistance due to the formation of crack-free oxide film on the surface of the coating.
研究领域:
材料科学
·
表面工程
·
高温氧化
·
陶瓷涂层
·
粉末冶金
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DOI
高影响因子
IONICS
·
2018
·Vol. 25
·期 3
·1157-1165
·
IF 2.347
Luo X. Y.,Meng B.,Zhao M. Y.,Xie H.,Bian L. F.,Yang X.
To improve the sintering performance of doped barium zirconate, (ZrO 2 ) 0.92 (Y 2 O 3 ) 0.08 (YSZ) was added and BaZr 0.8 Y 0.2 O 3-δ (BZY)- x %YSZ ( x = 20, 30 and 50% by weight) composite ceramics were prepared by mechanical ball milling combined with high-temperature sintering in air. The crystalline structure, chemical composition, microstructure and electrical properties of the composite electrolytes were characterized by XRD, SEM, TEM, EDS and EIS, respectively. The composite electrolytes only consist of BZY and YSZ phases, and there are no precipitates in BZY/YSZ grain boundaries according to the HR-TEM analysis. YSZ addition can improve the sintering properties of the composite electrolytes. When the composite ceramics with YSZ content of 50 wt% are sintered at 1450 °C for 6 h, the relative density and linear shrinkage are optimal. At 700 °C, the electrical conductivity of BZY-50%YSZ ceramic reaches 1.95 × 10 −4 S/cm and 1.67 × 10 −4 S/cm in the dry air and moist air, respectively.
研究领域:
材料科学
·
陶瓷学
·
固体离子学
·
能源材料
·
电子陶瓷
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xiang Shen,Tiande Xie,Jiangang Wang,Fan Wang
In this work, poly(N-acryloylmorpholine)-grafted ZrO 2 nanoparticles (ZrO 2 -g-PACMO) were directly blended with poly(vinyl chloride) (PVC) to prepare a hybrid membrane via the phase inversion method. In addition, the effects of ZrO 2 -g-PACMO and ZrO 2 nanoparticles on the structure and performance of resultant PVC membranes were comparatively investigated. The results indicated that the PVC/ZrO 2 -g-PACMO membrane exhibited a large macroviod of cross-section and a rough membrane surface. During membrane formation, the hydrophilic PACMO chains were preferably enriched onto the membrane surface, leading to the enhancement of surface hydrophilicity and the reduction of adhesion force between protein and membrane surface. The amount of adsorbed bovine serum albumin (BSA) on the poly(vinylidene fluoride)/ZrO 2 -g-PACMO decreases about 73% and 48% respectively, compared with original PVC and PVC/ZrO 2 membranes. Cycle filtration of pure water and BSA solution (0.5 g/L) confirmed that the total and irreversible membrane fouling were remarkably suppressed after incorporating ZrO 2 -g-PACMO into PVC membrane. Although the original ZrO 2 nanoparticle was also found to improve the protein fouling resistance of PVC membrane, there was a fatal limitation that the original ZrO 2 exhibited an agglomeration tendency during the membrane formation. The outcomes of the present work demonstrate that the synthesized ZrO 2 -g-PACMO nanoparticles have the potential for the design and preparation of anti-fouling PVC membrane.
研究领域:
材料科学
·
膜技术
·
化学工程
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.1
Min Zhao,Wenhao Shao,Jing Zhang,Yujie Xiao,Mingyang Xu,Chenmin Liu,Fanru Zhong,Xuehong Li,Min He,Lang Zhao,Xia Cui,Pengqi Guo
The usage of antineoplastic drugs and immunosuppressants, represented by methotrexate (MTX), has been increasing. However, their administration is characterized by significant inter-individual variability, often leading to ineffective treatment or severe adverse reactions, necessitating therapeutic drug monitoring (TDM). This study proposes a fabrication strategy for an electrochemical sensor, involving the electroreduction of graphene oxide (GO) followed by the deposition of zirconium dioxide nanoparticles (ZrO 2 NPs) to construct a ZrO 2 -decorated electrochemically reduced graphene oxide-modified glassy carbon electrode (ZrO 2 -ERGO/GCE). The developed electrochemical sensor was employed to detect MTX in phosphate-buffered saline (PBS) and diluted calf serum simulated samples. The ZrO 2 -ERGO/GCE sensor exhibited two segments of good linearity within a wide concentration range of 1 μmol/L - 600 μmol/L (with R 2 values of 0.9954 and 0.9936, respectively)， with a sensitivity of 7.09 μA/(μM·cm 2 ) and a low detection limit of 7.72 nmol/L. The platform achieved high sensitivity, a low detection limit, wide linear range, excellent reproducibility, long-term stability, and robust anti-interference capability against common biological species, demonstrating its promising potential for clinical TDM applications.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Sen Liu,Shuaishuai Wu,Beibei Tang,Mao Chen,Yongqiang Chen,Hailong Wang,Rui Zhang,Bingbing Fan
High-density h-BN@SiC/ZrO 2 composites with different ZrO 2 contents were prepared by hot-pressing. The microstructure, flexural strength, thermal shock behavior, thermal expansion properties and corrosion resistance of the composites in molten steel were systematically investigated. The construction of the h-BN@SiC core-shell structure is conducive to the formation of a uniform and continuous network structure during the sintering process. This significantly improves the sintering performance of h-BN-based materials and enables the low-temperature preparation of high-density products. Moreover, the uniform distribution of SiC can effectively coordinate the thermal matching between h-BN and ZrO 2 , significantly improving the high-temperature performance of the material. During the corrosion process, the SiC network structure can effectively bind ZrO 2 and BN particles, effectively resist the erosion of high-temperature molten steel, and its erosion resistance increases with the increase of ZrO 2 content. Especially, when the ZrO 2 content reached 40%, the erosion depth of the sample was merely 160.61 μm after being immersed in static molten steel for 120 min. Moreover, the h-BN@SiC/ZrO 2 composite with 30 wt% ZrO 2 demonstrates superior comprehensive performance: It achieves a flexural strength of 159.63 MPa, retains 87.08% of its original strength after thermal shock testing, exhibits a low apparent porosity of 3.37%, and possesses an average coefficient of thermal expansion as low as 3.95 × 10 −6 /K −1 . The comprehensive properties of h-BN@SiC/ZrO 2 composites were obviously improved by SiC network structure.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Zeyuan Li,Yuze Jiao,Huang Lin,Qianhong Shen,Xinglei Zhao,Peng Wang,Qilong Zhang
Traditional zirconia (ZrO 2 ) fibers suffer from severe limitations in mechanical performance under extreme conditions due to high-temperature phase transformation-induced cracking, abnormal grain growth, and inherent brittleness, making it difficult to meet the stringent requirements of fields such as aerospace and energy systems. This work proposes an innovative fabrication strategy that successfully achieves in-situ growth of an amorphous carbon coating layer on the surface of Al/Y co-doped ZrO 2 nanofibers through electrospinning and hot-stretching processes. In this work, zirconium acetate acts as both zirconium source and solvent, simplifying precursor preparation. The hot-stretching process utilizes the micropores on the fiber surface to form an in-situ amorphous carbon layer, which significantly enhances the mechanical properties of the fibers: tensile strength reaches 8.08 MPa, and the fiber membrane maintains structural integrity after 500 bending cycles at 80% strain, demonstrating excellent fatigue resistance and elastic recovery capability; it also exhibits outstanding thermal shock resistance at extremely low (-196°C) and ultra-high (1350°C) temperatures. Through the key innovation of introducing an amorphous carbon layer via hot-stretching, this work successfully integrates high strength, superior flexibility, and outstanding fatigue resistance into ZrO 2 fibers. Furthermore, owing to its high porosity (92%), the fiber membrane exhibits ultra-low thermal conductivity and effective sound absorption. Ultimately, this provides a reliable solution for multifunctional ceramic fiber materials applied in high-temperature environments (up to 800°C).
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 9
·e71194
·
IF 4.2
Le Fu,Bohan Wang,Zihua Lei,Mingxi Deng,Guanghua Liu
The in situ formation of carbon fillers has been demonstrated as an effective strategy to eliminate the agglomeration of carbon fillers in ceramic composites. In this study, combustion synthesis was employed to in situ incorporate carbon into a ZrO 2 –SiO 2 ceramic powder using CO 2 gas as the carbon source and magnesium powder as the exothermic medium. The resulting disordered carbon is uniformly distributed within the powder matrix. Furthermore, magnesium element is simultaneously incorporated into the powder as a byproduct. The co-presence of carbon and magnesium elements synergistically enhances the solid-state reaction between ZrO 2 and SiO 2 during sintering, facilitating the formation of ZrSiO 4 at a significantly reduced temperature of 1080°C. Meanwhile, the solid-state reaction significantly promotes the densification of the ceramic composite. The incorporated carbon exhibits strong bonding with the ceramic matrix and remains stable within the matrix up to at least 1000°C. Compared with conventional ZrSiO 4 , the ZrSiO 4 phase formed in this study exhibits much lower decomposition temperature in range of 1000°C–1200°C. Molten copper exhibits pronounced corrosion toward the ceramic composite, primarily through reactions with the SiO 2 phase released from the decomposition of ZrSiO 4 .
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DOI
高影响因子
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