JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2024
·
IF 2.2
Zhang Fangfang,Zuo Yuanyuan,Wu Degang,Yang Guanda,Schubert Dirk W.,Nie Lin
This study explores the surface modifications and properties of magnesium substrates through the application of alumina coatings for improved functionalities. Surface microstructures were investigated using a field emission scanning electron microscope after roughening treatments and alumina spray coatings. Elemental mapping revealed the distribution of coatings, demonstrating successful modifications with silane coupling agent and uniform alumina distribution. Contact angle measurements showcased enhanced hydrophobicity post-alumina coating, with notable improvements in contact angles over various liquids and self-cleaning assessments. Furthermore, wear resistance tests indicated the durability of the alumina coatings, displaying high stability even after repeated abrasions with sandpaper. The self-cleaning tests unveiled the remarkable performance of alumina-coated surfaces in repelling contaminants, underscoring their effective self-cleaning characteristics. Furthermore, the electromagnetic wave absorption properties of magnesium substrates coated with alumina demonstrated outstanding absorption efficiency, notably within the 7-11 GHz frequency range. This comprehensive analysis highlights the potential and effectiveness of alumina coatings in enhancing the properties of magnesium sheets, specifically in improving hydrophobicity, wear resistance, self-cleaning capabilities, and electromagnetic wave absorption.
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mingcheng Feng,Qingyun Fu,Jian Li,Jingyao Li,Qiong Wang,Xiangning Liu,Weihong Jin,Wei Li,Paul K. Chu,Zhentao Yu
Fast degradation of magnesium (Mg) and its alloys in the physiological environment has impeded their clinical use as temporary implants. To control degradation of Mg in the physiological environment, a sodium alginate coating is fabricated on alkalinized high-purity Mg with a silane transition layer by spin coating . The surface morphology and composition are investigated by scanning electron microscopy, energy-dispersive X-ray spectrometry , X-ray diffraction, and Fourier transform infrared spectroscopy . Electrochemical and immersion tests are performed in the simulated body fluid (SBF) at 37 °C. The composite coating with a thickness of 10.3 µm is uniform and adheres well to the Mg substrate. Compared to the bare substrate, the corrosion current density of the sample with the composite coating decreases from 130.9 ± 6.2–1.3 ± 0.3 μA cm −2 and the charge transfer resistance increases by 190 times. The average degradation rate in SBF drops to 0.80 ± 0.26 mm year −1 from 3.47 ± 0.25 mm year −1 of the pristine Mg substrate and the composite coating is demonstrated to impede corrosion of the Mg substrate after immersion in SBF for 14 days. The excellent protection rendered by the composite coating is ascribed to the effective barrier effects of the dense and adhering sodium alginate coating and blocking effect of chelate compounds of sodium alginate and Mg ions formed during the corrosion process.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Zhihui Tian,Zexuan Wang,Pufan Yao,Chaoqun Xia,Tai Yang,Qiang Li
In this study, some transitional metal carbides (Ti 3 C 2 , Ni 3 C, Mo 2 C, Cr 3 C 2 and NbC) were prepared to enhance the hydrogen storage behaviors of magnesium-based materials. The carbides with a weight ratio of 5 wt% were introduced into magnesium hydride (MgH 2 ) by mechanical ball milling , and the microstructure, phase composition and hydrogen storage properties of the composites were studied in detail. The phase compositions of Ni 3 C, Mo 2 C, Cr 3 C 2 and NbC in the ball-milled composites have not changed during hydrogen absorption and desorption cycles. However, Ti 3 C 2 decompose into multivalent Ti during hydrogenation process . All of these metal carbides can enhance the hydrogen absorption and desorption kinetics of MgH 2 . Among them, Ti 3 C 2 shows the best catalytic effect on dehydrogenation kinetic properties of MgH 2 , followed by the Ni 3 C, NbC, Mo 2 C and Cr 3 C 2 .
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 9
·5211-5226
·
IF 3.917
Jiang Lang,Li Ke,Yang Huiyu,Liu Xin,Xu Weilin,Deng Bo
Flower-shaped hydromagnesite (MgO-P) and magnesium oxide (MgO) micro spheres were synthesized via precipitation-aging method with and without calcination. The disassociated nano flaky petal of around 50 nm (~ 20 nm in thickness) of MgO-P and MgO by sonication were used as flame-retardants for the electrospun cellulose acetate (CA)/MgO-P or CA/MgO nanofiber. SEM, XRD, FTIR, HRTEM were used to characterize all related products. TGA was used to analyze the detailed decomposition procedures of bare, MgO-P, and MgO doped CA nanofiber. Three evaluation methods including broken time after heating, thermography during heating, and combustion observation were adopted to compare the flame-retardancy of composited nanofibers. Doped CA nanofibers showed best flame-retardancy by extending the heat-induced broken time from 0.46 to 12.09 s, which is 26.3 times that of CA nanofiber. The flame of CA/MgO-P and CA/MgO could be self-extinguished once the ignition source was removed. No smoke and size shrinkage could be observed during the combustion of CA/MgO-P or CA/MgO nanofibers. Corresponding flame-retarding mechanism of Mg-based nano flaky petal was proposed.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
STUDIES IN CONSERVATION
·
2020
·
IF 0.623
Lina Xie,Bingjian Zhang
Sandstone is a common sedimentary rock that is easily carved due to its weakly cemented fine grains and relatively low strength. Therefore, numerous large-scale grottoes in China are made of sandstone. However, these sandstone cultural heritage structures are often seriously damaged due to temperature and humidity changes, air pollution, biodeterioration, and repeated dissolution and crystallization of soluble salts. In general, it is imperative that a consolidant capable of providing cohesion by infilling pores between the stone grains is synthesized. In recent years, it has been reported that using organic consolidation materials for sandstone protection comes with various negative effects, such as a short lifetime, poor compatibility, and preservation damage. Using inorganic consolidation materials to protect sandstone seems to be one of the research trends for the future. Herein, this paper introduces a permeable, inorganic magnesium-based material (MMH solution) for silica sand consolidation. To assess this consolidant, the paper investigates the influence of varying molar ratios of MgO:MgCl2·6H2O:H2O on properties such as penetration depth, consolidation weight, colour variation, and compressive strength. The results demonstrate that the molar ratios of MgO:MgCl2·6H2O:H2O can significantly affect the consolidation performance. Additionally, it is believed that the MMH solution of MgO:MgCl2·6H2O:H2O = 5:1:16 can be successfully used for the consolidation of silica sand, as the cubic specimens’ surface micrographs show good compatibility between the consolidation product and sand grains. Experiments (i.e. weight loss rate and mineralogical compositions analysis) are performed to evaluate the cubic specimens’ water resistance properties after being immersed in water. Furthermore, the consolidation material’s failure mechanism as a self-sacrificing material is preliminarily analyzed. Results indicate that MMH solution is a promising conservation material that shows great potential for consolidating severely weathered sandstone.
研究领域:
文物保护
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材料科学
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地质学
✓ 已验证
DOI
高影响因子
SURFACE ENGINEERING
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2021
·
IF 3.169
Hanaa Soliman,Abdel Salam Makhlouf,Guojiang Wan
Since the bioactive surface needs hydrophilic coating; and the high corrosion resistance needs a hydrophobic one, it is a challenge to design a bioactive film that exhibits corrosion protection. In this article, Hexa-Methylene Diamine Tetra-Methylene Phosphonic Acid (HMDTMPA) film was deposited on Mg substrate at different heat treatment conditions. The heat-treated films at 150°C showed remarkable anticorrosion performance about five times the non-heated film. In addition, bioactivity character such as live cells attraction was noticed due to the increase of P–O groups that compensated the decrease of O–H groups in the film structure. Through the post-heat treatment, we were able to provide a new insight towards understanding how particular functional groups (OH) can modify the organic coating quality. The master key here is the formation of a stable film of chloroapatite that plays dual functions to inhibit the corrosive ions penetration and improve the bioactivity to attract the living-cell.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Congwen Duan,Haimei Wang,Jinhui Wu,Ting Qu,Yuling Zhang,Dong Fu,Lianxi Hu,Fei Wang,Dongsheng Lai,Yueru Dai,Ying Wu
Mg/MgH 2 stands out as an excellent hydrogen storage material due to its abundant presence and its capacity for high hydrogen storage density. However, the sluggish hydrogenation/dehydrogenation kinetics make it unsuitable for solid-state hydrogen storage. To tackle these challenges, the MgH 2 -Co@Pd‑c arbon nanotubes composite was created through ball milling , and its hydrogenation/dehydrogenation behavior was examined. The inclusion of Co@Pd notably enhanced the kinetics of hydrogenation/dehydrogenation in Mg/MgH 2 . The Mg-Co@Pd‑c arbon nanotubes composite achieved an absorption of 7.30 wt% H 2 in just 8 h of milling. The study proposed an energy conversion model to investigate the enhanced properties of Mg/MgH 2 . The addition of Co@Pd substantially reduced the activation energy (Ea) for hydrogen desorption to 81.9 kJ/mol. Furthermore, Transmission Electron Microscope and Density Functional Theory simulations were employed to understand how Co@Pd enhances the properties of Mg/MgH 2 . The improved hydriding/dehydriding kinetics of Mg/MgH 2 are likely closely linked to both the confining impact of c arbon nanotubes and the synergistic interplay of the “spillover” and “hydrogen pump” effects facilitated by the Co@Pd bimetallic catalysts . The excellent hydriding/dehydriding behavior is ascribed to the electron spillover and the phase transformation of Mg 2 Co/Mg 2 CoH 5 and Mg 6 Pd/Pd. These findings offer new insights into the new insights into the rational design of Co@Pd bimetallic catalysts, which are expected to be an optimal solution for supported catalysts in Mg-based solid-state hydrogen storage systems.
研究领域:
材料科学
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能源存储
·
催化化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2014
·Vol. 3
·期 5
·878-893
·
IF 0
J. Liu,X. L. Liu,T. F. Xi,C. C. Chu
The goal of this study is to examine whether a member of the newly developed biodegradable pseudo-protein biomaterial family could provide a far better protection and performance than the popular hydrolytically degradable poly(glycolide-co-lactide) (PLGA) biomaterial on an experimental magnesium substrate as a model. A member of the phenylalanine-based poly(ester amide)s, (8-Phe-4), was chosen as a model pseudo-protein polymer to coat onto as-cast magnesium (Mg) metal as the experimental model. The microstructures of the coatings were characterized by SEM, FTIR and water contact angle measurements. Nano-scratch test data indicated that the scratch resistance and elastic resilience of the 8-Phe-4 coating were superior to the PLGA coating. Standard electrochemical measurements along with the long-term immersion results indicated that the 8-Phe-4-coated Mg had preferable in vitro degradation and corrosion behavior than the PLGA-coated Mg. The cytocompatibility test was conducted via vascular smooth muscle cells (VSMCs) and human umbilical vein endothelial cells (ECV304), and the 8-Phe-4-coated Mg showed significantly better cell viability than the pure Mg and PLGA-coated Mg substrates over a 3 day incubation period. The favorable anti-corrosion behavior and cytocompatibility of the 8-Phe-4 coating suggest that the newly developed biodegradable pseudo-protein biomaterials may have great potential as biodegradable coating materials to enhance the protection and performance of Mg-based biomaterials and their application compared to the popular PLGA, and may bring the application of Mg-based biomaterials closer to clinical reality.
研究领域:
生物材料
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腐蚀科学
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生物医学工程
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组织工程
✓ 已验证
产品关联
DOI
PubMed
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