JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Rui Zhao,Cheng Cheng,Xiurong Wu,Xueyan Bai,Fenghuan Wang
Due to the excellent pore structure , MOFs as the stationary phase was playing an important part in chromatography . In this work, the shell-core MIL-101(Al)@SiO 2 composites post-synthetic modified by ligands with different polarities were fabricated for separation of estrogens. The structure and morphology of these materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FTIR), scanning electron microscope (SEM) and Brunauer-Emmett-Teller (BET). In order to investigate the influence of the ligand polarity on chromatographic separation performance of estrogens, alkyl molecules with different chain length were introduced as the ligands. With the hydrophobicity and chain length of the ligands increasing, the resolutions of the MIL-101(Al)@SiO 2 columns for the separation of estrogens exhibited the tendency of a parabola. Best result was achieved on the C4-MIL-101(Al)@SiO 2 column. On that basis, the possible retention mechanism on C4-MIL-101(Al)@SiO 2 column was elucidated by studying the mobile phase effect on separation behavior.
研究领域:
化学
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材料科学
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分析化学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 41
·e54523
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IF 3
Guiyou Jiang,Song Wu,Wei Yan,Tian Tian,Yang Li,Youwei Liao,Yan Yang
This paper presents a viable coating design for the production of waterborne coatings using PUA, Silicone-modified-PUA, Al-SiO 2 , and PTFE as key ingredients. The coatings are prepared through an air compression spraying technique followed by a photocuring procedure. The resulting PUA/Silicone-modified-PUA/Al-SiO 2 /PTFE coating exhibits exceptional properties including high hardness, low surface tension, and a low coefficient of friction. Experimental findings reveal noteworthy characteristics of the coating. It possesses a gloss level of 4–6°, a hardness of 492.69 N/mm, an elasticity modulus of 11469.94 MPa, a surface roughness of 0.87 μm, a dynamic coefficient of friction of 0.125 μN, and a surface tension of 0.4967 mN/m. To assess its performance, the coating underwent rigorous tests such as the CS-5 Wool Touchpad Shinning Friction test with a 200 g load over 250,000 cycles. It exhibited minimal changes in gloss (≤2°) and color difference (∆E ≤ 0.75). Additionally, the CS-10 abrasive head Optical Surface Taber Abrasion Resistance test was conducted using a 500 g load for 10 cycles, resulting in a Class 1 rating, and after 100 cycles, it achieved a Class 3 rating. This demonstrates its remarkable resistance to tribological environments, enduring tapping, touching, and scraping by fingers over extended periods.
研究领域:
材料科学
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表面工程
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2016
·Vol. 16
·期 12
·12635-12639
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IF 1.338
Du Jingjing,Xie Shaowen,Li Na,Xu Jianxiong,Xu Lijian
Hierarchical nanoporous Al–SiO2 particles were prepared in this study by dissolving template method. The hierarchical nanoporous Al–SiO2 particles with hollow structure were analyzed by transmission electron microscope (TEM), energy dispersive spectrometer
(EDS), scanning electron microscope (SEM), nitrogen adsorption stripping curves and Barrett-Joyner-Halenda (BJH) pore size distribution curves. Hierarchical nanoporous Al–SiO2/Ni–Mo composite electrodes were prepared by composite deposition of hierarchical nanoporous
Al–SiO2 particles onto electroplating bath of Ni–Mo. Results showed that the specific surface area for the hierarchical nanoporous Al–SiO2 sample was 396 m2/g, with pore volume being 1.37 cm3/g and mesoporous pore size being 3.3
nm. The hydrogen evolution electrocatalytic activities for the composite electrodes reached the optimal value when the concentration of the hierarchical nanoporous Al–SiO2 in the electroplating bath was 2 g/L, indicating that their “foam” structure did not only
enhance the electrode surface area but also effectively improved the electrocatalytic properties of aluminum and showed that the electrocatalytic hydrogen evolution by the hierarchical nanoporous Al–SiO2/Ni–Mo composite electrodes had more advantages than that of the
Ni–Mo electrodes alone.
研究领域:
材料科学
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电化学
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纳米技术
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催化
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DOI
高影响因子
COMBUSTION SCIENCE AND TECHNOLOGY
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2025
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IF 1.5
Baichen Chen,Yi Wang,Jianchen He,Xiaolan Song,Chongwei An
This article uses a combination of experimental and simulation methods for mutual verification to explore the possibility of nano aluminum thermite damaging chips and disrupting circuit systems. In terms of experiments, Fe2O3/SiO2/Al and SnO2/SiO2/Al aluminum thermites were prepared by physically mixing micro Al powder, nano SiO2, and nano metal oxide powder in a certain proportion. The binder was added and pressed into a charge column for ignition testing. The prepared aluminum thermite was characterized and its performance was tested using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy(XPS), and constant pressure combustion experiments.In terms of molecular dynamics simulation, Materials Studio software was used to investigate the interaction relationships between atoms in the aluminum thermite. The reaction process and properties of the aluminum thermite under adiabatic conditions at different initial temperatures were explored from the perspectives of potential energy, radial distribution function, mean square displacement, and self diffusion coefficient. The simulation results were compared with experimental reaction phenomena. The results show that the aluminum thermite prepared by physical method is uniformly mixed, various materials are fully adhered, well dispersed, and there is no agglomeration phenomenon. In terms of combustion performance, the overall performance of Fe2O3/SiO2/Al thermite is better than that of SnO2/SiO2/Al thermite, with higher combustion efficiency, higher reaction temperature, and the ability to maintain high temperature for a longer period of time. The combustion of Fe2O3/SiO2/Al aluminum thermite is more complete, and the reaction generates more elemental Si, which plays a positive role in the damage of chips. In terms of molecular dynamics simulation, the aluminum thermal reaction of Fe2O3/SiO2/Al at different initial temperatures is more stable, with a faster energy release rate and a higher total energy content than SnO2/SiO2/Al. The aluminum thermal reaction generates oxides of elemental Fe/Sn, Si, and Al. Overall, the diffusion coefficients of both aluminum thermites increase with the increase of initial temperature, and the intensity of the reaction also increases with the increase of initial temperature. Temperature has an accelerating effect on their diffusion, and SnO2/SiO2/Al has stronger diffusion ability than Fe2O3/SiO2/Al. The Fe2O3/SiO2/Al aluminum thermite has a better damage effect on chips, and the simulation and experimental results are consistent.
研究领域:
材料科学
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计算化学
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工程学
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yun Wu,Yanqun Yang,Ming Wen,Jing Xie,Linchun Bao,Shuting Yang,Xiangming Luo,Xingyi Wang,Qianchun Zhang
Monoamine neurotransmitters play vital roles in cognitive and various physiological and pathophysiological processes, but their trace levels, small sample volumes, and complex biological matrices in biological samples pose significant analytical challenges. This study developed a novel method for the simultaneous quantification of six monoamine neurotransmitters—tyrosine, vanillylmandelic acid, tryptophan, 3,4-dihydroxyphenylacetic acid, 5-hydroxyindole-3-acetic acid, and homovanillic acid—in human serum and urine. The method utilizes magnetic solid-phase extraction coupled with ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). A multifunctional magnetic composite, polyethylenimine@polymer dopamine hydrochloride@NH 2 -MIL-53(Al)-SiO 2 @Fe 3 O 4 , was synthesized, exhibiting high extraction selectivity and capacity and achieving an extraction range of 9.61–25.4 nmol/mg for the target neurotransmitters. The analytical method, optimized for the aforementioned composite, exhibited robust linearity for all six monoamine neurotransmitters, with correlation coefficients ( R 2 ) exceeding 0.998. The limits of detection (S/N = 3) ranged from 1.1 to 22 ng/L, indicating high sensitivity. Recovery rates for the targeted analytes varied between 94.5 % and 112 %, and relative standard deviations remained within the range of 1.5–9.4 %. These findings confirm that the developed methodology is sensitive, accurate, selective, and reliable for the quantitative determination of trace monoamine neurotransmitters in complex biological samples.
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高影响因子
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