APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jiaojiao Tan,Jiaming Wang,Ziyang Zhang,Zhi Ma,Luhui Wang,Yuan Liu
To improve the catalytic activity of CO 2 methanation at low temperature, a series of Ni/ZrO 2 catalysts with different Ni loadings were prepared by citrate complexing method. Based on the optimal Ni loading of 6 wt%, a certain amount of MgO was doped to improve the thermal stability of Ni/ZrO 2 catalyst. When Ni/Mg molar ratio was 4, there was the best performance, getting as high as 90% CO 2 conversion and nearly 100% CH 4 selectivity at 250 °C, 0.1 MPa and a WHSV of 15,000 ml g −1 h −1 , and the equilibrium CO 2 conversion was obtained at 300 °C. XRD , BET, TPR, CO 2 -TPD, H 2 -TPD, XPS , TG and TEM were conducted to investigate the reason of high activity of Ni/ZrO 2 catalyst at low temperature and the effect of doping MgO. Results suggested that highly dispersed Ni nanoparticles are responsible for the excellent catalytic activity. MgO can effectively improve stability of Ni-based catalysts by the confinement effect. Meanwhile, it is also found that there are little improvements on catalytic activity after doping MgO, and the TOF of catalysts with different MgO doping is basically the same, indicating CO 2 can be efficiently adsorbed and activated on the monoclinic ZrO 2 , and MgO do not contribute to the intrinsic activity.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
J.X. Bi,C.F. Xing,C.H. Yang,H.T. Wu
A novel series of rock salt structured (1-x)Li 2 ZrO 3 -xMgO ceramics were prepared via the conventional solid state method. The tetragonal-cubic phase transition can be observed in the case of 0.5 ≤ x ≤ 0.6, which has been testified by the results of XRD and SEM-EDS. Relatively dense and homogeneous microstructure can be obtained for all the compositions sintered at 1500 °C. With the x value increasing from 0.5 to 0.8, the relative permittivity linearly decreases from 16.50 to 12.65, and the τ f value decreases from ∼−10 ppm/°C to ∼−35 ppm/°C. The addition of MgO stabilizes the crystal structure and increases the bond energies in Li 2 ZrO 3 -MgO system, so there is an upward tendency in Q· f values from ∼77,000 GHz to ∼166,000 GHz. Typically, the Li 2 Mg 4 ZrO 7 ceramics sintered at 1500 °C possesses excellent properties with ε r = 12.65, Q· f = 165,924 GHz and τ f =-34.66 ppm/°C, which makes these materials good candidates for microwave devices.
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高影响因子
Processes
·
2022
·Vol. 10
·期 7
·1302
·
IF 3.352
Hailun Ren,Weihong Li
3-hydroxybutyraldehyde (3-HBA) is mainly employed to synthesize 1,3-BDO (1,3-butanediol), which is one of the most important components in cosmetics moisturizers. In this study, a series of composite oxide catalysts were prepared by bringing alkaline earth metal Ca and rare earth metal La to the composite oxide MgO/Al2O3, which were made through the co-precipitation method. These catalysts were applied in the synthesis of 3-HBA through acetaldehyde (AcH) condensation. The structure, texture, and acidic properties of these catalysts were characterized using various characterization methods, and the effects of catalyst composition, reaction temperature, reaction pressure, and residence time on the conversion of AcH were investigated as well. The results showed that the introduction of Ca and La weakened the acidic property and enhanced the basic property, which favored the AcH condensation to synthesize 3-HBA. At a temperature of 20 °C, pressure of 200 kPa, and residence time of 70 min, 0.5%La-2.3%Ca-2MgO/Al2O3exhibited a better catalytic activity, and the conversion of AcH reached 95.89%. The selectivity and yield of 3-HBA were 92.08% and 88.30%, respectively. The stability test indicated that the high AcH conversion could be maintained for 5 h.Keywords:composite oxides;acetaldehyde;condensation catalyst;3-hydroxybutyraldehyde
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Qiangqiang Xue,Zhengwen Li,Zhao Jiang,Meng Chen,Yujun Wang,Binhang Yan,Guangsheng Luo
Steam reforming (SR) is a process for converting transportation fuels into hydrogen-rich gas, which can be fed to SOFCs for on-board power supplies. Herein, we prepare Mg x Ni 1-x O (0.5
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高影响因子
Frontiers in Bioengineering and Biotechnology
·
2021
·
IF 5.89
Peng Wenzao,Ren Shuangshuang,Zhang Yibo,Fan Ruyi,Zhou Yi,Li Lu,Xu Xuanwen,Xu Yan
Electrospinning technique has attracted considerable attention in fabrication of cellulose nanofibrils or nanocellulose membranes, in which polycaprolactone (PCL) could be used as a promising precursor to prepare various cellulose nanofibril membranes for periodontal tissue regeneration. Conventional bio-membranes and cellulose films used in guided tissue regeneration (GTR) can prevent the downgrowth of epithelial cells, fibroblasts, and connective tissue in the area of tooth root but have limitations related to osteogenic and antimicrobial properties. Cellulose nanofibrils can be used as an ideal drug delivery material to encapsulate and carry some drugs. In this study, magnesium oxide (MgO) nanoparticles-incorporated PCL/gelatin core-shell nanocellulose periodontal membranes were fabricated using coaxial electrospinning technique, which was termed as Coaxial-MgO. The membranes using single-nozzle electrospinning technique, namely Blending-MgO and Blending-Blank, were used as control. The morphology and physicochemical property of these nanocellulose membranes were characterized by scanning electron microscopy (SEM), energy-dispersive spectrum of X-ray (EDS), transmission electron microscopy (TEM), contact angle, and thermogravimetric analysis (TGA). The results showed that the incorporation of MgO nanoparticles barely affected the morphology and mechanical property of nanocellulose membranes. Coaxial-MgO with core-shell fiber structure had better hydrophilic property and sustainable release of magnesium ion (Mg2+). CCK-8 cell proliferation and EdU staining demonstrated that Coaxial-MgO membranes showed better human periodontal ligament stem cells (hPDLSCs) proliferation rates compared with the other group due to its gelatin shell with great biocompatibility and hydrophilicity. SEM and immunofluorescence assay results illustrated that the Coaxial-MgO scaffold significantly enhanced hPDLSCs adhesion. In vitro osteogenic and antibacterial properties showed that Coaxial-MgO membrane enhanced alkaline phosphatase (ALP) activity, formation of mineralized nodules, osteogenic-related genes [ALP, collagen type 1 (COL1), runt-related transcription factor 2 (Runx2)], and high antibacterial properties toward Escherichia coli (E. coli) and Actinobacillus actinomycetemcomitans (A. a) when compared with controls. Our findings suggested that MgO nanoparticles-incorporated coaxial electrospinning PCL-derived nanocellulose periodontal membranes might have great prospects for periodontal tissue regeneration.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Ying-juan Hao,Li-gang Tian,Erhong Duan,Jixing Liu,Tian-yuan Qi,Wei-qi Kong,Xue-han Qi,Xinying Liu,Ying Liu,Jun Zhao,Fa-tang Li
Methane is a greenhouse gas that contributes to global warming. Hence, effectively removing the low concentration (<1000 ppm) of methane in the environment is an issue that deserves research in the field of catalysis. In this study, oxygen–magnesium bivacancies are simultaneously imbedded into MgO by designing an in situ reduction combustion atmosphere for oxygen release and substituting magnesium with carbon to induce the formation of magnesium vacancies. The DFT calculations reveal that the surface electron density of MgO is improved by the oxygen vacancy structure and the substitution of Mg by C in bulk; this accelerates migration of the charge from the material surface to the adsorbed oxygen species, which leads to abundant surface peroxide species that enable activation and oxidation of methane at a low temperature (below 200 °C). This work could provide a concept for developing non-noble or transition metal oxides for low-temperature activation and conversion of alkanes in the thermocatalytic field through reactive oxygen species.
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DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 28
·6100-6114
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IF 5.344
Haotian Pan,Huichang Gao,Qingtao Li,Zefeng Lin,Qi Feng,Chenxi Yu,Xiaohua Zhang,Hua Dong,Dafu Chen,Xiaodong Cao
Hydrogels are appealing biomaterials for regenerative medicine since biomimetic modifications of their polymeric network can provide unique physical properties and emulate the native extracellular matrix (ECM). Meanwhile, therapeutic metal ions, such as magnesium ions (Mg2+), not only regulate cellular behaviours but also stimulate local bone formation and healing. However, the absence of a meaningful macroporous structure and the uncompromising mechanical strength are still challenges. Herein, we designed a macroporous composite hydrogel based on mild and fast thiol–ene click reactions. The Pickering emulsion method was adopted to form a macroporous structure and introduce MgO nanoparticles (NPs). The results show that the composite hydrogel possesses good mechanical strength and an evenly distributed macroporous structure. MgO NPs stabilized at the oil/water interface not only function as effective emulsion stabilizers, but also enhance the mechanical properties of hydrogels and mediate the sustained release of Mg2+. In vitro cell experiments demonstrated that the composite hydrogel displays good biocompatibility. More importantly, the release of Mg2+ ions from hydrogels can effectively promote the osteogenic differentiation of BMSCs. Furthermore, an in vivo study showed that macroporous hydrogels can provide a good extracellular matrix microenvironment for in situ osteogenesis and accelerate bone tissue regeneration.
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PubMed
高影响因子
Journal of the Australian Ceramic Society
·
2019
·Vol. 56
·期 3
·895-903
·
IF 0.692
Ma Jing-Yi,Zhang Yi-Bing,Wang Jun-Xia,Song Yu-Yang,Zhou Tong,Wang Yan,Wang Hao-Yu,Wang Jin
In the present paper, the ordered Nd 2 Zr 2 O 7 pyrochlore was primarily synthesized by flux method and the MgO-Nd 2 Zr 2 O 7 composite ceramics were fabricated subsequently through a conventional sintering route. A suite of characterization techniques, including XRD, Raman and BSE-EDS were employed to investigate the phase composition and microstructure of the as-prepared Nd 2 Zr 2 O 7 and MgO-Nd 2 Zr 2 O 7 samples. The acid solubility of the MgO-Nd 2 Zr 2 O 7 composite ceramics was also tested. XRD results showed that the ordered Nd 2 Zr 2 O 7 pyrochlore can be synthesized when the calcination temperature is in the range of 850–1200 °C. Raman results suggested that the chemical bonds of Nd 2 Zr 2 O 7 pyrochlore get stronger, and more ordered structure can be gradually formed with the increase of calcining temperature. For the MgO-Nd 2 Zr 2 O 7 composite ceramics, XRD results also showed that the Nd 2 Zr 2 O 7 phase in the composite ceramics presents higher crystallinity degree and no other phase is formed after sintering at 1400–1550 °C. Moreover, BSE-EDS results indicated that the MgO-Nd 2 Zr 2 O 7 composite ceramics are compact and dense, and the MgO and Nd 2 Zr 2 O 7 phases are almost uniformly distributed between each other. In addition, the relative density of the bulk ceramics was about 96–98%, and it was concluded that ≥ 1500 °C could be the suitable sintering temperature to produce MgO-Nd 2 Zr 2 O 7 composite ceramics. At last, the dissolution behavior of the ceramics in nitric acid solution revealed that only MgO in the MgO-Nd 2 Zr 2 O 7 composite ceramics can be dissolved in the 11 M HNO 3 solution within 24 h, and the dissolution rate was relatively low because of the high densification of the sample.
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高影响因子
LUMINESCENCE
·
2025
·Vol. 40
·期 7
·e70255
·
IF 3
Keyue Wu,Yi Yang,Zeya Wang
Near-infrared (NIR) phosphors activated by Cr 3+ ions hold significant potential for applications such as night vision and plant growth lighting due to their tunable emission properties governed by crystal field (CF) strength. In this study, Cr 3+ and Ti 4+ co-doped MgO phosphors were synthesized via a high-temperature solid-state reaction to modulate the NIR emission. Structural and optical characterizations revealed that Ti 4+ incorporation enhances the CF strength ( D q/ B ratio increases from 2.4 to 2.6), inducing a blue shift in the emission peak from 810 (MgO:Cr 3+ ) to 780 nm (Mg 0.8 Ti 0.2 O:Cr 3+ ) and with a strong sharp emission at 720 nm. The Ti 4+ doping also increases the fluorescence lifetime from 150.9 to 816.4 μs, attributed to altered Cr 3+ occupancy in octahedral sites and modified spin-allowed transitions. These findings demonstrate that Ti 4+ co-doping effectively tunes the NIR emission of MgO:Cr 3+ phosphors, offering a promising strategy for designing wavelength-adjustable NIR light sources.
研究领域:
材料科学
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光学材料
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固体物理
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光子学
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PubMed
高影响因子
Catalysts
·
2024
·Vol. 14
·期 5
·332
·
IF 3.8
Xiongxiong Zuo,Xing Tang
The catalytic isomerization of glucose to fructose plays a pivotal role in the application of biomass as a feedstock for chemicals. Herein, we propose a facile solid-state-grinding strategy to construct ZrO2/MgO mixed oxides, which offered an excellent fructose yield of over 34.55% and a high selectivity of 80.52% (80 °C, 2 h). The co-mingling of amphiphilic ZrO2with MgO improved the unfavorable moderate/strongly basic site distribution on MgO, which can prohibit the side reactions during the reaction and enhance the fructose selectivity. Based on the catalyst characterizations, MgO was deposited on the ZrO2surface by plugging the pores, and the addition of ZrO2lessened the quantity of strongly basic sites of MgO. Additionally, the presence of ZrO2largely enhanced the catalyst stability in comparison with pure MgO by recycling experiments.
研究领域:
生物化学
·
催化化学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yunxi Chen,Zikang Yu,Xin Liu,Hongjin Zhang,Yang Peng,Jian Xu,Li Liu
Phosphor-in-glass (PiG) materials have been widely fabricated into various types of luminescent films due to their simple fabrication process, high color purity, and adjustable luminescence. However, existing reflective PiG films (PiGFs) still face significant challenges in serving as reliable color converters, mainly stemming from inadequate thermal management capabilities and limited optical efficiency. Herein, magnesium oxide (MgO) with a high thermal conductivity of 47–53.5 W/(m·K) was selected to form a MgO-in-glass (MiG) layer aimed at simultaneously enhancing heat dissipation and light extraction. A reflective PiGF@AlN converter with a sandwich structure—Y 3 Al 5 O 12 :Ce 3 + (YAG) PiGF and MiG layer on AlN substrate (YAG@MiG@AlN, YMA)—was developed. This structure effectively leverages the high thermal conductivities of AlN and MgO to improve heat dissipation. The optimized YMA converter with 60 wt% YAG and 4 wt% MgO achieves a high saturation threshold of 29 W/mm 2 and a luminous flux (LF) of 3682 lm, which exhibits a 24 % enhancement in maximum LF over the YAG@TiO 2 @AlN (YTA) converter and a 39 % improvement over the YAG@AlN converter (2649 lm@31 W/ mm 2 ). These results highlight the potential of the YMA converter in high-brightness and efficiency laser-driven lighting.
研究领域:
材料科学
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光学工程
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热管理
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固态照明
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激光驱动照明
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 105
·86485-86489
·
IF 3.84
Xiu-xiu Dong,Mei-ying Li,Nan-nan Feng,Yuan-ming Sun,Chi Yang,Zhen-lin Xu
In this work, a nonenzymatic electrochemical sensor based on nanoporous magnesium oxide (MgO) was developed for the rapid screening of hydrogen peroxide (H2O2) in milk. The nanoporous MgO, which was synthesized by a novel one-pot reaction process at low temperature, showed a large specific surface area and was favorable for constructing biosensors. Based on the nanoporous MgO, a nano-sensor for H2O2 was developed. The sensor exhibited extremely high electrocatalytic activity toward the oxidation of H2O2 with a detection limit of 3.3 μM and a wide linear range from 0.05 to 0.2 and 0.2 to 10 mM. The averaged recovery was determined to be from 94.3% to 119% for spiked milk samples. The proposed method is ideally suited for the fast screening of H2O2 misuse in milk at low cost.
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