JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2016
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IF 1.733
Peng Chen,Jiadi Sun,Ye Zhu,Xun Yu,Long Meng,Yang Li,Xiaoya Liu
Degrading Mg and its alloys are a category of implant materials for bone surgery, but rapid corrosion in physiological environment limits their clinical applications. To improve the corrosion resistance of Mg-based implants, a biodegradable composite polymer coating is deposited on an Mg rod in this work. The strategy is to decorate Mg surfaces with poly(γ-glutamic acid)-g-7-amino-4-methylcoumarin/hydroxyapatite (γ-PGA-g-AMC/HAp) composite nanoparticles through electrophoretic deposition in ethanol. The morphology and chemical composition of the resulting coating material are determined by scanning electron microscopy and Fourier transform infrared spectroscopy. Sample rods of bare Mg and coated Mg are implanted intramedullary into the femora of New Zealand white rabbits, periodic radiography and post-autopsy histopathology of each sample are analyzed. The obtained in vivo results clearly confirm that the coating material decreases degradation rate of the underlying Mg sample and appears good histocompatibility and osteoinductivity. The main aim of this work is to investigate the degradation process of bare Mg and coated Mg samples in bone environment and their effect on the surrounding bone tissue.
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Materials Today Sustainability
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2023
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IF 7.8
L. Xie,J. Ding,X. Kong,J. Qin,J. Wang
With the development of modern industry and increasing population around the world, the overuse of fossil fuels for energy supply has produced large amounts of CO 2 in the atmosphere. Metal-organic frameworks (MOFs) with tailorable structures and developed porosity have emerged as promising candidates for CO 2 adsorption and separation. However, the synthesis of MOFs by conventional hydrothermal method faces challenges like low crystallization rate and yield, which limits their industrial application for gas adsorption. In this work, a highly efficient microwave (MW)-assisted method was employed for the synthesis of Mg-gallate. The effects of MW conditions on the structure, morphology, and CO 2 adsorption properties of Mg-gallate were systematically investigated. The highest CO 2 adsorption performance (5.37 mmol g −1 at 298 K and 1 bar) was achieved on the Mg-gallate synthesized at 100 °C for 20 min under an MW power of 100 W. The obtained Mg-gallate also exhibited high adsorption selectivity of CO 2 over N 2 (1500) and superior recyclability . Furthermore, the Mg-gallate@PEI composite beads were designed by incorporating the MOF crystals into the polymeric matrix in order to satisfy the industrial application demands. The combined advantages of rapid MW synthesis, excellent adsorption performance, and shaping make the Mg-gallate a promising material for practical CO 2 capture.
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Nanomaterials
·
2021
·Vol. 12
·期 1
·127
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IF 5.076
Qining Wang,Quanwang Yan,Yu Zhao,Jie Ren,Ning Ai
Cu-Mg-Al layered double hydroxides (LDHs) with amine modification were prepared by an organic combination of an anionic surfactant-mediated method and an ultrasonic spalling method usingN-aminoethyl-γ-aminopropyltrimethoxysilane as a grafting agent. The materials were characterized by elemental analysis, XRD, SEM, FTIR, TGA, and XPS. The effects of the Cu2+content on the surface morphology and the CO2adsorption of Cu-Mg-Al LDHs were investigated, and the kinetics of the CO2adsorption and the photocatalytic reduction of CO2were further analyzed. The results indicated that the amine-modified method and appropriate Cu2+contents can improve the surface morphology, the increase amine loading and the free-amino functional groups of the materials, which were beneficial to CO2capture and adsorption. The CO2adsorption capacity of Cu-Mg-Al N was 1.82 mmol·g−1at 30 °C and a 0.1 MPa pure CO2atmosphere. The kinetic model confirmed that CO2adsorption was governed by both the physical and chemical adsorption, which could be enhanced with the increase of the Cu2+content. The chemical adsorption was suppressed, when the Cu2+content was too high. Cu-Mg-Al N can photocatalytically reduce CO2to methanol with Cu2+as an active site, which can significantly improve the CO2adsorption and photocatalytic conversion.
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Journal of Physical Chemistry C
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2021
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IF 4.126
Joshua Adedeji Bolarin,Zhao Zhang,Hujun Cao,Zhi Li,Teng He,Ping Chen
This paper seeks to present notable insights into the catalytic behavior of a ferroelectric BaTiO3 nanomaterial at the boundary plane in the separation of MgH2 starting from 185 °C. The synergy between mechanical milling and enhanced electronic distribution at the surface of BaTiO3 aided magnesium to a remarkable absorption of 4.5 wt % H2 at room temperature under 30 bar within 20 h. The composite released H2 ∼ 5.7 wt % in 15 min at 310 °C and ∼5.1 wt % in 90 min at 250 °C. The lowered activation energy of decomposition was calculated to be ∼60 kJ/mol with a decomposition enthalpy of 72.3 kJ/mol-H2. The composite reversibly produced ∼5.7 wt % H2 across 20 cycles in less than 120 h at 300 °C. As revealed by detailed experimental results, the interplay between +4 and +3 states of titanium at “111” twin boundaries of BaTiO3, and the formation of oxygen vacancies, play an important role in improving the sorption kinetics and the reversibility of Mg/MgH2. Meanwhile, the anomalous ferroelectric character of the +2 state of barium around Ti–O and Mg after milling of BaTiO3 is also believed to slightly enhance MgH2 desorption enthalpy via a chemisorption process. Our findings have brought MgH2 a few steps closer to practical applications.
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Results in Physics
·
2022
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IF 4.565
Yige Du,Qilong Gao,Andrea Sanson,Hengli Xie,Yangming Hu,Gaojie Zeng,Juan Guo,Xiao Ren,Erjun Liang
Negative thermal expansion (NTE) is an intriguing physical phenomenon, which is of great significance for the high precision application. In this work, we have realized to broaden the NTE temperature zone in Mg 2 P 2 O 7 -based bulk material by doping Cu atom on the Mg site. A joint study of Raman scattering and X-ray diffraction (XRD) indicates that there are double phases in the NTE temperature zone, and the NTE of Mg 1.9 Cu 0.1 P 2 O 7 bulk material comes from the phase transition of α - and β -phase. The present work provides a way to optimize negative thermal expansion property in phase transition typed materials.
研究领域:
材料科学
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凝聚态物理
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无机化学
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功能材料
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热学性能
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Khurshid Hussain,Ijaz Ali,Sayed Hasnain,Sayed Sajid Hussain,Basharat Hussain,Muhammad Shehzad Khan,Syed Muhammad Ammar,Bilal Hussain,Aqib Hussain,Muhammad Amir Javed,Abid Ullah,Saleh Al Arni,Noureddine Elboughdiri,Nadir Abbas
A novel Mg - doped CeO 2 electrode materials were prepared by simple and cost effective hydrothermal method by using three different reagents (ammonium fluoride, potassium hydroxide and hexamethylenetetramine). Successful preparation was confirmed by using various characterizations. In three electrode setup, CeO 2 : Mg-NH 4 F, CeO 2 : Mg-KOH, and CeO 2 : Mg-HMTA showed a high specific capacitance of 432, 275 and 221 F g −1 at 1 A g −1 respectively. After 10,000 continuous cycles of charging and discharging, only 11% fade in the specific capacitance was observed for CeO 2 : Mg-NH 4 F. Moreover, CeO 2 : Mg-NH 4 F was used as a positive electrode and (activated carbon) AC as a negative electrode for asymmetric supercapacitor (ASC) device. The highest specific capacity of 130C g −1 at 1 A g −1 was obtained for ASC device. ASC device delivered a high energy density of 28.8 Wh kg −1 at a power density of 775 W kg −1 . ASC device showed an excellent retention of 83% and an outstanding coulombic efficiency of 99% after 9000 cycles. All these attractive results suggest the importance of this electrode material towards practical applications.
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APPLIED CLAY SCIENCE
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2017
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IF 3.101
Ning Mao,Chun Hui Zhou,John Keeling,Saverio Fiore,Hao Zhang,Liang Chen,Gui Chen Jin,Ting Ting Zhu,Dong Shen Tong,Wei Hua Yu
Dolomite is a widespread carbonate mineral that has been investigated extensively over the past two centuries. Despite the high level of investigation, aspects of the environmental conditions of crystallization, diagenesis and dissolution remain elusive and the transformation of dolomite into other value-added products is still challenging. This work shows a novel, cleaner method to dissolve dolomite by taking advantage of the acidity from the hydrolysis of Lewis acid AlCl 3 and as such the mineral can be efficiently converted into Ca-Mg-Al layered double hydroxide (LDH). The dolomite and the resulting Ca-Mg-Al LDH samples were characterized by powder X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The composition of the products was measured by energy dispersive spectrometer-mapping (EDS-mapping), X-ray fluorescence (XRF) and atomic absorption spectroscopy (AAS). Particle sizes of the products were measured by a dynamic light scattering method. It is documented, for the first time, that dissolution of dolomite in AlCl 3 aqueous solution is facilitated by hydrothermal treatment . Well-crystallized Ca-Mg-Al LDH crystals are achieved under (Ca + Mg): Al molar ratio = 1:1, pH = 10.5 via a simple co-precipitation method. The maximum utilization efficiencies of Ca 2+ , Mg 2+ from dolomite to LDH are 36.3% and 95.5%, respectively. The possible mechanisms of LDH formation were: 1) the dolomite dissolved in the strong acid solution due to the hydrolysis of AlCl 3 and thus provided Ca 2+ and Mg 2+ ; 2) with addition of NaOH, Al 3+ cations precipitated to form Al(OH) 3 (at 8.3 ≤ pH ≤ 9.3) and then part of the Al(OH) 3 reacted with Ca 2+ and Mg 2+ to form the Ca-Mg-Al LDH; 3) at pH = 10.5, the Al(OH) 3 was transformed as [AlO(OH)] and meanwhile Ca 2+ , Mg 2+ and Al 3+ took part in the formation of Ca-Mg-Al LDH; 4) when pH = 10.6, [AlO(OH)] reacted with NaOH to dissolve into [Al(OH) 4 ]− and the [Al(OH) 4 ]− finally co-precipitated with Ca 2+ and Mg 2+ to form the Ca-Mg-Al LDH during heating for drying.
研究领域:
材料科学
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矿物加工
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无机化学
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环境地球化学
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湿法冶金
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Qian Chen,Wenyan Guo,Dan Fang,Ting Li,Lin Chen,Chun Mao,Mimi Wan,Jian Shen
The efficient capture and detection of circulating tumor cells (CTCs) in blood is very important for the early detection of cancer. In this work, efficient detection of CTCs through electrochemical means utilizing Mg-Based micromotors was realized, the prepared Fe 3 O 4 /P/anti-E nanoparticle was subjected to modification using an aldehyde-amine condensation reaction to attach it to the Mg ball. Utilizing the asymmetrical structure of micromotor, we find that the movement range of the magnesium microsphere has obviously improved. On this basis, efficient capture of CTCs can be realized upon the modification of Fe 3 O 4 /P/anti-E with capturing cyclability ability. Such a behavior can be attributed to the anti-E modified on the micromotor can target the epithelial cell adhesion factors on CTCs. Furthermore, A funnel-shaped electrochemical detection device was developed to realize the electrochemical detection of captured CTCs based on the insularity of CTCs. The strategy can potentially provide new visions for the early detection and timely treatment of cancer.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Guoan Lin,Xiaoqin Sun,Xiaoxiang Xu
LaTiO 2 N is modified by Mg doping to construct solid solution series, i.e ., LaTi 1−x Mg x O 2+y N 1−y (0 ≤ x ≤ 0.5). This modification effectively decreases the defect concentration (particularly bulk Ti 3+ species and anion vacancies), increases the surface hydrophilicity, positively shifts the valence band top albeit it also enlarges the bandgap and induces Ti/Mg ordering when x ≥ 0.2. These competitive tensions render an optimal composition at LaTi 0.9 Mg 0.1 O 2+y N 1−y (x = 0.1) where both a low defect concentration and a disordered state of Ti/Mg can be reached, demonstrating much-improved photocarrier separation and exceptional photocatalytic activity with apparent quantum efficiency as high as 13.02 % at 420 ± 20 nm for O 2 -evolution. Overall water splitting (H 2 /O 2 molar ratio = 2/1) with good recycling stability has been realized by integrating LaTi 0.9 Mg 0.1 O 2+y N 1−y into a Z-scheme system. These findings justify the efficacy of Mg as a useful modulator to improve the photocatalytic performance of metal oxynitrides.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
·
IF 8.91
Jia Liu,Shengzhi Wei,Huili Zhang,Yimin Deng,Jan Baeyens,Raf Dewil,Nick Sweygers,Lise Appels
Adsorption is a widely applied waste water treatment technology , especially for removing micro-pollutants and dyes of industrial effluents . Over the past decade, adsorbing metal oxide micron- and nano-particles have been successfully developed and investigated as adsorbents. In the present research, Mg-ferrite adsorbent particles were synthesized and their properties were fully determined. The pore volume is 0.139 cm 3 /g. The BET analysis reveals a surface area of 94.4 m 2 /g. The porosity is of meso- and microporous nature. The adsorbent was used to adsorb acid fuchsine, an important industrial dye. The equilibrium adsorption capacity was 796.4 mg/g, with an adsorption yield of 78.7–82.0%. The adsorption kinetics can be adequately fitted by a pseudo-second-order model. The isotherms of both Langmuir and Freundlich are applicable. The stability, recovery and reuse of the ferrite particles were proven in multi-cycle experiments, and the adsorption activity decreased by less than 3% between the first and fifth cycle. Experimental and fitting results were finally used to design a batch adsorber to remove a given concentration of acid fuchsine from different volumes of wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Congwen Duan,Zhaohua Su,Yating Tian,Dong Fu,Yuling Zhang,Wei Lv,Jinghong Zhang,Lianxi Hu,Ying Wu
MgH 2 , as one of the most potential hydrogen storage materials, has received considerable attention. However, its development has been plagued by its slow hydriding kinetics. Mechanochemical milling is an effective and convenient method for producing MgH 2 @CNTs-Ni through a solid–gas reaction between Mg-CNTs-Ni and H 2 . However, the hydriding kinetics and the corresponding mechanism during the milling have not been mentioned. Thus, hydriding kinetics of Mg-CNTs-Ni was researched for the purpose of gaining insights into the reaction mechanism and obtaining the best milling parameters. Also, phase transition during the milling was analyzed using XRD and TEM . It is apparent that the Avrami-Erofeev (AE) model can well describe the mechanochemical process, which contains solid solution, phase transition and growth-controlled regime. Besides, kinetics of hydrogenation is limited by nucleation and growth of MgH 2 . By fitting with the Arrhenius equation, average apparent activation energy for the hydrogenation of Mg-CNTs-Ni is estimated to be 47.8 kJ mol −1 .
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Materials
·
2022
·Vol. 15
·期 5
·1622
·
IF 3.748
Guonan Liu,Jilei Xu,Baojing Feng,Jinhui Liu,Dongqing Qi,Wenzhan Huang,Peixu Yang,Shaojun Zhang
Adjusting the microstructure through the deformation process is one of the ways to improve the properties of Mg alloys. Most studies have focused on the influence of the microstructure after deformation treatment on the mechanical properties of Mg alloys. In this paper, extruded and forged Mg-Gd-Y-Nd-Zr alloys were selected to investigate the corrosion performance of two deformed magnesium alloys immersed in 0.6 M NaCl solution using a hydrogen evolution test, a weight loss test, an immersion experiment, and an electrochemical test. The results showed that WE43 alloys undergoing different deformation treatments presented different microstructures, which led to different corrosion behaviors and corrosion resistance. The extruded WE43 alloy showed uniform corrosion, while the forged WE43 alloy suffered severe local galvanic corrosion. Meanwhile, the corrosion rate of the forged WE43 alloy was about four times faster than that of the extruded WE43 alloy.Keywords:magnesium;rare earth elements;erosion;weight loss;pitting corrosion
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