INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 24
·期 1
·272
·
IF 6.208
Lei Chen,Yijia Yin,Linjia Jian,Xianglong Han,Xuefeng Zhao,Donghui Wang
Osteogenic and antibacterial abilities are the permanent pursuit of titanium (Ti)-based orthopedic implants. However, it is difficult to strike the right balance between these two properties. It has been proved that an appropriate alkaline microenvironment formed by Ti modified by magnesium–aluminum layered double hydroxides (Mg–Al LDHs) could achieve the selective killing of bacteria and promote osteogenesis. However, the existence of Al induces biosafety concerns. In this study, iron (Fe), an essential trace element in the human body, was used to substitute Al, and a calcinated Mg–Fe LDH film was constructed on Ti. The results showed that a proper local alkaline environment created by the constructed film could enhance the antibacterial and osteogenic properties of the material. In addition, the introduction of Fe promoted the Fenton reaction and could produce reactive oxygen species in the infection environment, which might further strengthen the in vivo bactericidal effect.Keywords:antibacterial;osteogenic;Mg–Fe layered double hydroxides;alkaline microenvironment;Fenton reaction
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DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Jing Bai,Xianli Wang,Xin Ye,Xiaoyu Li,Xi Tan,Cheng Wang,Yunfei Guo,Jiaqi Dong,Yi Shao,Chenglin Chu,Feng Xue,Li Tao,Liqu Huang
Due to bacteria in urine and inadequate blood supply, urethral defect repair faces great clinical difficulties. Inspired by the natural structure of the urethra, in this study, we designed a multifunctional hydrogel urethral patch with a Janus structure. The inner layer was a double-network hydrogel of polyvinyl alcohol/carboxymethyl chitosan (PVA/CMCS) enhanced by natural phytic acid (PA) and Mg 2+ (Mg 2+ -PA/PVA/CMCS). The outer layer was composed of poly (L-lactic acid) (PLLA) nanofibers to form a hydrophobic barrier, coupling via a micelle layer to ensure interfacial bonding. The patch exhibited mechanical properties matching soft tissues, with maximum tensile strength and toughness of 1.69±0.13 MPa and 24.7±0.9 MJ/m 3 , respectively, under the strengthening effect of Mg 2+ -PA chelation. Therein, the 4 % Mg 2+ -PA/PVA/CMCS composite patch could maintain unilateral hydrophobicity for at least 14 days and demonstrated an antibacterial rate of 99.0 %±0.1 % against E. coli . In PBS, the patch could deliver Mg 2+ for at least 7 days and stabilize the surrounding pH environment for up to 28 days. In vitro cell experiments indicated that the 4 % Mg 2+ -PA/PVA/CMCS composite patch could promote the human umbilical vein endothelial cell (HUVEC) proliferation and migration, with the angiogenic protein expression enhanced more than 1.2 times compared with the Control group. In conclusion, the patch constructed in this study may provide a new approach to clinical urethral injury repair.
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DOI
高影响因子
CATALYSIS TODAY
·
2017
·
IF 4.636
Tianxin Li,Qian Li,Hongyu Long,Kuo-Chih Chou,Qun Luo
A modified Chou model with parameters of temperature ( T ), initial hydrogen pressure ( P 0 ), enthalpy change (Δ H ) and entropy change (Δ S ) is proposed in consideration of thermodynamic driving force. The meaningful activation energy E v can be calculated for the negative temperature dependence of hydriding reaction in hydrogen storage materials. This model is verified by the hydriding/dehydriding experimental data of (LaNi 5 ) 1− x Mg x ( x = 0, 0.018, 0.041, 0.063). The calculated results indicate that the hydriding kinetics of (LaNi 5 ) 1− x Mg x alloys are controlled by diffusion of hydrogen atom in hydride. The addition of small amount of magnesium improves the kinetic performance of LaNi 5 slightly. Furthermore, the modified Chou model was compared with the previous model that successfully explain the negative temperature depending hydrogenation reaction of Mg-based alloys. The fitting results show that the modified Chou model can describe the hydrogen absorption kinetic mechanism of negative temperature dependent materials more accurately.
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DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 5
·2763-2772
·
IF 9.3
Lei Guo,Shuaibo Gao,Zuojun Hu,Yongxin Wu,Fangzhao Pang,Huayi Yin,Dihua Wang
Green metal-electrode batteries call for the clean production of s-block metals. Herein, we developed an electrolysis–displacement–distillation (EDD) approach for producing s-block metals with low-carbon emissions and no chlorine gas evolution. The clean production stems from the choice of a molten NaCl–Na2CO3 electrolyte to prevent chlorine gas evolution, an inert nickel-based anode to produce oxygen, and a liquid metal cathode to make the cathodic product (e.g., Na–Sn) sit at the bottom of the electrolytic cell. Later, M–Sn (M = Li, Mg, Ca, Sr, and Ba) alloys were successfully prepared by a displacement reaction between the Na–Sn alloy and molten NaCl–LiCl, NaCl–MgCl2, NaCl–CaCl2, NaCl–SrCl2, or NaCl–BaCl2 with a displacement efficiency of >96.0%. Furthermore, Li, Mg, Ca, Sr, and Ba metals were separated from M–Sn alloys using vacuum distillation with a separation rate of >95.0%. We achieved a current efficiency of 81.0% for the electrolytic production of 100 kg of a liquid Na–Sn alloy, which holds promise to produce s-block metals at a large scale.
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DOI
高影响因子
ENERGY
·
2017
·
IF 4.52
J. Yan,C.Y. Zhao,Z.H. Pan
Cyclic stability is a key factor in the design of thermochemical heat storage systems . Because carbon dioxide (CO 2 ) may react with heat storage materials and lead to a decrease in energy storage efficiency, the effect of CO 2 on Ca(OH) 2 /CaO and Mg(OH) 2 /MgO systems is investigated in this study. The experimental results show that CO 2 reacts with CaO in the water vapor that appears during the heat release process. Therefore, in the design of Ca(OH) 2 /CaO systems, CO 2 should be cleared from the system. The results from Mg(OH) 2 /MgO systems show that CO 2 only slightly reacts with MgO and Mg(OH) 2 during heat storage and release processes. This study indicates that carbonic acid (H 2 CO 3 ) could easily react with CaO/Ca(OH) 2 to form CaCO 3 during heat release processes. Generally, the remaining CO 2 reduces the reversibility of Ca(OH) 2 /CaO systems but has only a slight influence on Mg(OH) 2 /MgO systems. In addition, the experimental results show that carbonate shell does not exist in rehydration for both of the CaO/MgO samples, but the influence of CO 2 on the entire process increases after each cycle.
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DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Tianqi Yuan,Miao Chen,Xiaotong Sun,Jianping Guan,Fawei Zhu,Kai Tang,Zhipeng Zhang,Qi Liu,Xiaoqing Chen
Designing chiral adsorption separation material with high enantioselectivity and stability is a promising route to realize the enantioselective recognition and separation of racemic molecules. Here, for the first time, camphor sulfonic acid derivatives (CSA) were synthesized as a chiral resolving agent, and it was modified on Mg/Al layered double hydroxide (Mg/Al-LDH) through electrostatic self-assembly to construct functionalized chiral adsorption separation material (CSA@LDH), which could be served as an adsorbent for enantioselective recognition and separation of propranolol enantiomers ( R,S -PRO). The CSA@LDH maintained the advantage of limited chiral space in layered structures to achieve the selective enrichment of R -PRO, and the e.e. % value of single separation could reach 19.5%. Meanwhile, density functional theory (DFT) calculations supported that chiral recognition and separation were ascribed to the discrepancy in affinities stemming from the difference of π-π interaction force and hydrogen bonding capacity of CSA with R,S -PRO. Hence, considering the superior ability of hydrogen bond coordination and stereocontrol of camphor sulfonic acid derivatives, it is expected to be more widely used as a chiral resolving agent for other enantiomeric recognition and separation.
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Lucheng Li,Jie Ni,Zehua Zhu,Xiaojun Zuo
A novel Mg-loaded chitosan carbonized microsphere (MCCM) was prepared for simultaneous adsorption of ammonium and phosphate in this study, through the investigation of preparation procedures, addition ratio, and preparation temperature. Pollutants removals by MCCM were more acceptable with 64.71% for ammonium and 99.26% for phosphorus, compared with chitosan carbonized microspheres (CCM), Mg-loaded chitosan hydrogel beads (MCH) and MgCl 2 ·6H 2 O. Addition ratio of 0.6:1 (m chitosan : m MgCl2 ) and preparation temperature of 400 °C in MCCM preparation were responsible for pollutant removal and yield. The effect analysis of MCCM dosage, solution pH, pollutant concentration , adsorption mode and coexisting ions on the removal for both ammonium and phosphate indicated that pollutants removals were increased with increasing MCCM dosages, and achieved the peak at pH 8.5, but presented to be stable with Na + , K + , Ca 2+ , Cl − , NO 3 − , CO 3 2− and SO 4 2− , except for Fe 3+ .Adsorption mechanisms discussion implied that simultaneous ammonium and phosphate removal with MCCM was attributed to struvite precipitation, ion exchange, hydrogen bonding, electrostatic attraction and Mg–P complexation, suggesting that MCCM presents a new way for simultaneous concentrated ammonium and phosphate removal in wastewater treatment .
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Luyao Xu,Xiaojing Fu,Huijuan Su,Huilai Sun,Ruichuan Li,Yong Wan
This study is aimed at the enhancement of the corrosion and tribocorrosion performance of AZ31B magnesium (Mg) alloys after plasma electrolytic oxidization (PEO) treatment. Some PEO-treated Mg samples were coated with chitosan (CS) film by dip-coated method, while others were subjected to hydrothermal treatment (HT) followed by CS film. The microstructure and chemical composition of coatings were investigated via X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy . Corrosion resistance of the specimens was evaluated via electrochemical measurements (open circuit potential and electrochemical impedance spectroscopy) in simulated body fluid. The tribocorrosion performance was determined by simultaneously recording the variation of the friction coefficient and the open circuit potential with the sliding time. The results indicated that better corrosion and tribocorrosion performance were observed when CS layer is applied on hydrothermally treated PEO samples than on the bare PEO samples. Thus, fabrication of hydrothermally treated PEO surface coatings with chitosan is a significant approach to protect the Mg from corrosion and tribocorrosion, thereby increasing the potential application of Mg alloy as biological implants .
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DOI
高影响因子
Arabian Journal of Chemistry
·
2015
·
IF 3.725
Shifeng Li,Yanming Shen,Min Xiao,Dongbin Liu,Lihui Fan
Controlled release formulations have been proven to have potential in overcoming the drawbacks of conventional plant growth regulators. Novel controlled-release formulation of β -naphthoxyacetic acid (BNOA) intercalated MgAl-layered double hydroxides (LDHs) was prepared by co-precipitation method. The effects of temperature, pH value, and release medium on BNOA release were studied and the releasing mechanisms were discussed. The results of release show that the increase of temperature induces the increase of BNOA release extent. The release rate and accumulated release amount of BNOA are found to be dependent to the anion in the aqueous solution in the order of CO 3 2− > SO 4 2− > Cl − . Moreover, the pH is the key controlling factor for the BNOA release processes, and with strong acid medium, the release character of BNOA is different from those at pH 7 and 12, which accompanies with fast collapse of LDHs nanolayered structure. The nanohybrid of BNOA intercalated LDHs possessed good controlled release properties and the BNOA release character from the nanohybrid fitted pseudo-second-order model in neutral medium.
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DOI
高影响因子
Metals
·
2025
·Vol. 15
·期 3
·337
·
IF 2.5
Shuaipeng Gao,Shaoyuan Lyu,Qian Zhao,Minfang Chen
The effects of extrusion temperatures on the microstructure, mechanical properties, and corrosion performance of biomedical Mg-1Zn-0.4Ca-1MgO composites were systematically investigated. The results indicated that lower extrusion temperatures notably refined the grain size and promoted the formation of numerous nano-scaled secondary phase particles. The grain sizes were 0.8 μm, 1.7 μm, and 3.4 μm for the materials extruded at 280 °C, 310 °C, and 330 °C, which were named ET280, ET310, and ET330. The finest grain size and abundant precipitates enhanced the mechanical properties of the composite with a microhardness of 86.9 HV, a yield strength of 305 MPa, and a fracture elongation of 15.2%. Moreover, the ET280 alloy with ultra-fine grains exhibited the optimal corrosion resistance among these three composites, and its annual corrosion after immersion in Hank’s solution for 14 days was only 0.17 mm/y. The excellent performance in vitro immersion was mainly attributed to the formation of the uniformly dense Ca-P layer on its surface and the contiguous compact Mg(OH)2layer, which could effectively weaken the contact between the corrosive solution and the Mg matrix.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jie Zhou,Siyuan Jin,Ruizhi Wu,Xiaochun Ma,Mengyao Pang,Zhe Yu,Guixiang Wang,Jinghuai Zhang,Boris Krit,Sergey Betsofen,Vitalii Neshchimenko,Buzikov Ruslan,Min Qiu,Yurong Yang,Jiaming Chen
Microarc oxidation (MAO) coatings incorporating hexagonal boron nitride (h-BN) nanoparticles were synthesized on Mg-Li alloys. The effects of h-BN nanoparticle concentration on the structure, phase composition, and tribological properties of the MAO coatings were systematically investigated. The results indicate that the addition of h-BN nanoparticles induces the formation of protrusions on the coating surface, varied in size and distribution with the concentration of h-BN particles. The protrusions are advantageous for enhancing the wear resistance of the coating, owing to the effective reduction of the contact area and the lubricating impact of the released h-BN particles during wear. The thickness and hardness of the coating contained h-BN particles are significantly elevated. At an optimal h-BN concentration of 7 g/L, the composite coating exhibits the lowest average coefficient of friction (COF = 0.59) and the minimum wear rate (W = 2.6 × 10 −6 mm 3 /N·m), thereby demonstrating superior tribological performance.
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高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Jiangyu Yu,Yingbo Zhang,Decai Zhu,Wenliang Fan,Nan Wang,Yaohui Niu,Jiali Zhou,Chengjun Zhu
A major challenge for semiconductor ion fuel cells (SIFCs) is to design an electrolyte with proton transport properties so that it can maintain high ionic conductivity within relatively low temperatures. Herein, we develop a Sr and Mg codoped LaAlO3 electrolyte that facilitates efficient conduction of protons and oxygen ions by enriching oxygen vacancies and reducing the activation energy of ion conduction. The optimized electrolyte shows a low activation energy of 0.31 eV and demonstrates remarkably elevated ionic conductivity at low temperatures, e.g., 0.1994 S cm–1 at 550 °C. This is attributed to the significant increase in oxygen vacancies, which has been verified by XPS technology. Meanwhile, the Sr and Mg codoped LaAlO3 electrolyte exhibits remarkable proton transport properties, confirmed by proton filtration experiments, which provide further evidence for the improvement of the electrolyte ionic conductivity. As a result, the fuel cell with an optimized LaAlO3 electrolyte delivers an impressive peak power density of 977 mW·cm–2 with an open circuit voltage (OCV) of 1.126 V at 550 °C. Particularly, compared with the fuel cell with a pure LaAlO3 electrolyte, the peak power density is increased by 38.4%. The dual-ion doping strategy provides crucial insight into the further development of high ionic conductivity electrolytes for SIFCs.
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