DIAMOND AND RELATED MATERIALS
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2022
·
IF 3.806
Miaomiao Li,Dening Zou,Bifang Zhao,Jinghui Chu,Libo Tong
The extensive application of Mg alloys is restricted by their poor corrosion, wear resistances and long-term service performance. Although the low-cost epoxy (EP) coating has excellent corrosion resistance , many pores and cracks are easily formed during the curing process, leading to the deterioration of barrier capacity. This study reports an epoxy-based nanocomposite coating, fabricated through the hybridization of γ-(2, 3-epoxypropoxy) propytrimethoxy silane modified silica nanoparticles and graphene oxide (mSiO 2 /GO). The insulating SiO 2 particles can isolate the direct contact between Mg alloy substrate and GO sheets, avoiding the formation of micro-cells and preventing the galvanic corrosion . The SiO 2 /GO in EP coating with “crack pinning and bridge” structure has reduced porosity and enhanced consistency, which effectively prevents crack propagation and electrolyte penetration. The corrosion rate of SiO 2 /GO/EP coating is 374 and 10 times lower than that of pure EP coating and individual GO/EP coating, respectively. The wear rate of GO/EP and SiO 2 /GO/EP coating specimens is 81.2 % and 70.4 % less than that of the pure EP coating, which is related to the favorable lubricating performance and high hardness of GO nanosheets . The results show that the embedding of well-distributed mSiO 2 -GO hybrids can remarkably improve the barrier effect and anti-corrosion of EP coating.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Wenjiang Huang,Di Mei,Haotian Qin,Jingan Li,Liguo Wang,Xiaoshuang Ma,Shijie Zhu,Shaokang Guan
To reduce the degradation of magnesium alloy , improve its antibacterial activity , and fulfil specific requirements for bone implant material applications, a chitosan (CS)/boron nitride nanosheet (BNNS) composite coating was constructed on the surface of Mg–Zn–Y–Nd–Zr alloy via electrodeposition . The results show that BNNS was uniformly embedded and significantly changed the morphology and roughness of the CS coating. Electrochemical and immersion tests suggest that the CS–BNNS composite coating can effectively provide a long-term protection to the substrate. The antibacterial activity results show that BNNS significantly improved the antibacterial activity of the CS coating against E. coli and S. aureus , and verified the sterilisation mechanism of BNNS in contact with bacterial membranes. Meanwhile, cytocompatibility tests showed that the CS–BNNS coating has no adverse effect on the adhesion and proliferation of mouse osteoblasts cells. Thus, the fabricated CS–BNNS composite coating could be a promising application in surface modification for Mg-based bone implants.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
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IF 4.1
Minghui Duan,Guo Zeng,Jian He,Weiguo Wang
Carbon nitride (g-C 3 N 4 ) is a potential material that can be used for the treatment of the wastewater contains organic dyes. However, the photocatalytic efficiency of g-C 3 N 4 is limited by the wide band gap and fast recombination of photon-generated carriers. In this work, the co-doped with Mg and Zn of Mg Zn 0.07 -g-C 3 N 4 was designed and prepared to enhance the photocatalytic efficiency. The co-doped Mg and Zn shorted the band gap of g-C 3 N 4 from 2.74 eV to 2.50 eV. Interestingly, according to the DFT calculation, a Zn-bridge is formed between the interlayers of g-C 3 N 4 . The Zn-bridge reduces the electron localization and prolongs the existence time of photon-generated carriers. The as-prepared Mg Zn 0.07 -g-C 3 N 4 was applied for the photodegradation of methylene blue. The degradation ratios and photodynamic parameter of Mg Zn 0.07 -g-C 3 N 4 are higher than that of g-C 3 N 4 and Mg-g-C 3 N 4 (29.51 × 10 −3 min vs 8.00 × 10 −3 min).
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高影响因子
Materials Today Nano
·
2021
·
IF 8.109
B. Liu,B. Zhang,X. Chen,Y. Lv,H. Huang,J. Yuan,W. Lv,Y. Wu
Transition metals are the traditional catalysts to improve the hydrogen storage performance of Mg. In the present article, the multi-valence Co catalyst (Co@CNTs) is prepared to improve the kinetics of Mg. The dehydrogenation temperature decreases, and desorption kinetics of MgH 2 is significantly enhanced by the addition of the catalyst. The dehydrogenation of MgH 2 –Co@CNTs composite is a random bulk nucleation/surface and three-dimensional growth with constant interface velocity reaction. Although the dehydrogenation activation energy of MgH 2 –Co@CNTs composite is reduced, the enthalpy change and entropy change of the composite are similar to the raw MgH 2 , which means the dehydrogenation is mainly dissociation of MgH 2 . Besides, the cycle performance of MgH 2 –Co@CNTs composite is stable. The damping of the performance for the composite is negligible after 50 cycles, which benefits from the in-site formed Co 3 MgC 0.5 in the composite. The Co 3 MgC 0.5 can act as a ‘hydrogen pump’ to adjust the hydrogen storage performance of Mg. Theoretical studies show that multi-valence Co can trap H 2 molecules and weaken their σ-bonds. In the first cycle, the bridging effect of Co plays an important role in the improvement of H 2 dissociation and release. In the subsequent cycles, Co 6 C 1 becomes the active site to assist the hydrogenation and dehydrogenation of the composite.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Xuan Zhu,Yan Liu,Menglin Wang,Li Zhang,Qiaoli Li,Entao Zhang,Hongfen Mo,Yuan Gao,Chenyu Xu,Yanwei Zhang
The synergistic coupling of light and heat in solar energy has attracted increasing research attention. In this work, both codoping and coloading were applied to SrTiO 3 -based catalysts to improve their solar photo and thermal conversion, respectively, and maximum productivities of 51.55 and 25.59 mmol·g −1 ·h −1 were achieved for H 2 and O 2 in photothermal synergistic water splitting. The yield of H 2 was nearly double that achieved via pure photocatalysis. In addition to many experiments and characterizations, DFT calculations were also performed to clarify the photothermal synergy. It was found that both the light absorbance and mobility of photoinduced carriers could be promoted by solar thermal effects in the material. Meanwhile, the energy barriers of the key steps were reduced with increasing temperature in the hydrogen production driven by solar photo effects. This work offers new ideas for designing catalysts for solar hydrogen production with photothermal synergistic strategies.
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FUEL
·
2023
·
IF 7.4
Xiaoqian Feng,Yilin Zhao,Shenghua Liu,Kun Wang,Baoshan Liu,Qijian Zhang,Huan Wang,Yonghua Zhao,Jing Liu,Peng Zhang,Lian Gao
Dry reforming of methane (DRM) suffers catalysts deactivation due to severe coking. Ni/MgO-Al 2 O 3 is a promising system for DRM catalysts with high coking resistance, as the addition of MgO in Ni/Al 2 O 3 catalysts can improve the alkalinity of the support and enhance the metal-support interaction. However, so far the activity and stability of Ni/MgO-Al 2 O 3 is still unsatisfactory while the role of Mg addition remains unclear. In this paper, a series Ni 0.5 /xMgO-Al 2 O 3 catalysts with flower-like hollow sphere morphology and high surface area were synthesized via a facile hydrothermal method. Appropriate Mg addition promotes the formation of NiAl 2 O 4 while more Mg addition leads to the formation of Ni x Mg y O. Both cases can enhance the MSI of the catalysts without changing the morphology of the catalyst. More Mg addition also leads to stronger CO 2 adsorption via improving the alkalinity. Nevertheless, overdose of Mg results in weaker MSI and the blockage of Ni active sites. Ni 0.5 /0.5MgO-Al 2 O 3 with moderate Mg addition shows excellent activity (CH 4 ∼ 75 %, CO 2 ∼ 85 %) and stability (>100 h) at a high GHSV = 144000 ml/g cat ·h −1 and 800 °C with nearly no coking formation (<0.8 wt%). This work helps reveal the role of MgO addition in Ni/Al 2 O 3 systems and gives new insights into the design of DRM catalysts with high activity and stability.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2020
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IF 4.389
Luxin Liang,Qianli Huang,Hong Wu,Zhengxiao Ouyang,Tang Liu,Hao He,Jian Xiao,Guanghua Lei,Kun Zhou
Magnesium (Mg) is well-known for its bioactivity and degradability. However, due to its low evaporation temperature and limited solubility in titanium (Ti), the fabrication of Ti-Mg alloys remains a huge challenge. In this study, Ti-xMg (x = 0.312, 0.625, 1.25 and 2.5 wt.%) alloys were fabricated by the combination of mechanical alloying (MA) and spark plasma sintering (SPS). Mg mainly existed as a solid solute element in the Ti matrix, while it also existed as second-phase particles due to its precipitation and dispersion during the SPS process. At a low content of 0.625 wt.%, Mg could increase the mechanical strength of Ti by the solid solution strengthening. However, it was detrimental to material mechanical properties when the Mg content increased to 1.25 wt.%. Being immersed in phosphate buffered solution (PBS), Ti-Mg alloys exhibited a burst Mg 2+ release behavior within the first day, and then the rates of Mg 2+ release gradually decreased within the following 27 days. The results suggested that the cell viability was dependent on the content of Mg in the Ti-Mg alloys. The high Mg content (2.5 wt.%) in the Ti-Mg alloys could lead to significant cytotoxicity. However, appropriate Mg content (0.312∼0.625 wt.%) could promote cell attachment, proliferation and differentiation. The Ti-0.625Mg alloy exhibited the best in vitro biological performance among all groups. In vivo results obtained by implanting the Ti-0.625Mg alloy in the femurs of rats further revealed its enhanced regenerative potential and osteointegration compared to pure Ti implants.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Wei-Ming Yin,Yan Wang,Yu-Chang Hou,Yuan Sun,Ji-Guo Zhang,Hui-Liang Sun,Shu-Jun Li,Qing-Jiang Pan,Yuan-Ru Guo
The ever-growing contamination of water resources generated by heavy metals is posing significant threat to sustainable development, and urging the necessity of safe disposal. In this work, we designed a facile method to prepare carbon dots/Mg(OH) 2 (marked as CDs/Mg(OH) 2 ) composite, which enables to remove and recover potentially toxic metal of Cd 2+ from water. The newly-prepared CDs/Mg(OH) 2 features a hierarchical petaloid-array structure and has large specific surface area of 96.2 m 2 g −1 . It is evident that the composite is composed of Mg(OH) 2 slices, to which CDs are attached. Density functional theory calculation recognized the composite microstructure at the atomic level. Weak chemical coupling between sub-units were borne out by optimized structures, energetics, infrared vibrations, and electronic structures. The CDs/Mg(OH) 2 composite shows high removal capacity and long durability while treating Cd(II)-contaminated water. The incorporation of CDs could regulate and control the up-taking rate of Cd 2+ ions and consequently fabricate well-dispersed 1D nanowires of Cd(OH) 2 . The corresponding mechanism was proposed. Specifically, the sample CDs/Mg(OH) 2 -60 reaches 1015.4 mg g −1 removal capacity; it can be used for 12 cycles and still keep removal efficiency as high as 98.6%.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2020
·Vol. 27
·期 5
·394-408
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IF 0
Zhang Luhong,Guo Dandan,Tantai Xiaowei,Jiang Bin,Sun Yongli,Yang Na
In this work, a facile and effective strategy to prepare three-dimensional (3D) hierarchical flower-like Mg–Al layered double hydroxides (3D-LDH) was developed via a one-step double-drop coprecipitation method using γ-Al 2 O 3 particles as a template. The characterization and experimental results showed that the calcined product, 3D-LDO, features a large specific surface area of 204.2 m 2 /g, abundant active sites, and excellent adsorption performance for Congo red (CR), methyl orange (MO), and methyl blue (MB). The maximum adsorption capacities of 3D-LDO for CR, MO, and MB were 1428.6, 476.2, and 1666.7 mg/g, respectively; such performance is superior to that of most reported adsorbents. The adsorption mechanism of organic anionic dyes by 3D-LDO was extensively investigated and attributed to surface adsorption, the memory effect of 3D-LDO, and the unique 3D hierarchical flower-like structure of the adsorbent. Recycling performance tests revealed that 3D-LDO has satisfactory reusability for the three organic anionic dyes.
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Polymer-Plastics Technology and Materials
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2019
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IF 0
Ying Pan,Ke Ke,Lin Cheng,Hongting Zhao
In this study, flexible polyurethane foam (FPUF) was successfully coated with nano-Mg(OH)2 platelets. Due to the strong interaction between chitosan and nano-Mg(OH)2, it was possible to yield modified foam with a weight-gain of up to 15 wt% by depositing one chitosan layer and one nano-Mg(OH)2 layer. Meanwhile, the adsorption isotherms of Cu2+ on FPUF covered with 10 wt% coating (FPUF-10) shows the Langmuir behavior. It was found that for the FPUF-10, the removal % for Cu2+ after 30 min and 50 min treatment were 86% and 90%, respectively. Moreover, the maximum removal % could reach up to 95%.
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IONICS
·
2019
·Vol. 25
·期 11
·5353-5360
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IF 2.289
Ren Xiaoying,Xu Tao,Du Junlin,Pu Zhaohui,Wang Runbo,Wu Zhu
High-temperature battery system operated at or below 300 °C is highly desired for geothermal borehole applications. However, it remains a challenge to find suitable electrode materials meeting the need of wide borehole temperature. In this study, the discharge performance of Li 2 MoO 4 /LiNO 3 -KNO 3 /Li-Mg-B alloy battery system was studied over the temperature range of 150~300 °C with different current densities ranging from 10 to 30 mA cm −2 . The electrochemical test result showed that the single cell delivered maximum discharge capacity at 250 °C, with value of 1178.6 mAh g −1 at a current density of 10 mA cm −2 . Besides, it is found that the discharge capacities of the single cell increased as the current density rose at 300 °C attributed to the enhanced ionic conductivity at high temperature. As a result, the Li 2 MoO 4 /LiNO 3 -KNO 3 /Li-Mg-B alloy system is capable of being used in instrumentation for geothermal and oil/gas borehole explore between 200 and 250 °C.
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ORGANIC ELECTRONICS
·
2019
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IF 3.495
Rashed Alsharafi,Yangbin Zhu,Fushan Li,Zhongwei Xu,Hailong Hu,Tailiang Guo
Zinc oxide (ZnO) nanoparticles (NPs) are extensively adopted material to be used as efficient electron transport layer (ETL) in quantum dot light emitting diodes (QLEDs) due to their suitable properties of high electron mobility , good stability, and easy processability. However, because of the naturally high work function of ZnO NPs, the electrons can be spontaneously transferred at the quantum dot/ZnO interface. In addition, the enormous difference in electron and hole mobility can lead to interfacial exciton quenching and unbalanced charge injection. In this paper, the strategy of replacing the ZnO in QLEDs with Mg and polyvinylpyrrolidone (PVP) inorganic-organic hybrid co-doped ZnO NPs are introduced. The energy band structures of ZnO NPs are tailored by tuning the concentrations of Mg, resulting in a significant suppression of the spontaneous charge transfer at the quantum dot/ETL interface. Furthermore, the surface quenching sites and the electronic mobility of ETL were adjusted via PVP doping. The proposed method significantly enhances the current efficiency and external quantum efficiency to 16.16 cd/A and 15.45%, respectively, an improvement of about 2.5-fold compared to the devices with pure ZnO NPs.
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危险品化学品经营许可证（带存储）