CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yue Dong,Mengying Zhou,Huaguang Zhou,Ying Deng,Xuchun Wang,Xuemei Zhang
In this paper, a MOD (Metal organic decomposition) Al doped ZnO (AZO) ink was directly used for inkjet printing transparent and conductive AZO films. The ink was synthesized by using zinc acetate dihydrate and aluminum nitrate nonahydrate as precursor, 1,2-diaminopropane as a complexing agent, ethyl alcohol as solution, ethyl cellulose as addition agent. The thermal decomposition behavior of the MOD ink was investigated. The various MOD AZO inks were inkjet printed and heated at different temperatures for different times. The films were studied by X-ray diffraction, scanning electron microscopy, resistivity measurements and ultraviolet–visible spectroscopy. The results demonstrated that 0.2 M AZO (2 at%) film heated at 250 °C for 120 min showed highly preferential growth along the c -axis, uniform microstructure with a resistivity of 0.03 Ω cm and high transmittance more than 90% in the visible range of the spectrum with an optical band gap at 3.326 eV.
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高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Liyu Chen,Jiaxin Yang,Yifan Zhang,Shaohua Wu,Youjian Yang,Wenju Tao,Jiangyu Yu,Zhaowen Wang
The electrochemical behavior of Zr(IV) on a molybdenum (Mo) electrode in a KF-AlF 3 -Al 2 O 3 -ZrO 2 molten salt system was studied using cyclic voltammetry (CV), square-wave voltammetry (SWV) and chronopotentiometry (CP). The reduction process of Zr(IV) was found to follow a two-step, two-electron transfer mechanism: Zr(IV)+2e − →Zr(II) and Zr(II)+2e − →Zr(0). The reduction process was quasi-reversible and controlled by diffusion. Al-Zr alloys were successfully obtained on Mo and liquid aluminum electrodes by potentiostatic electrodeposition . Flower-like AlZr 3 and irregular granular Al 3 Zr were obtained on the Mo electrode, which were mainly attributed to the electrochemical co-reduction of Al(III) and Zr(IV) in the molten salt. Three Al-Zr alloy phases, Al 3 Zr , Al 3 Zr 2, and Al 2 Zr, were obtained on the liquid aluminum electrode, among which Al 3 Zr was dominant in the product, followed by Al 3 Zr 2 .
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SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Xiang Hou,Hao Wang,Qun Yang,Yanxia Chen,Linjiang Chai,Bo Song,Ning Guo,Shengfeng Guo,Zhongwen Yao
An Al-containing ODS steel was coated with a composite Cr-AlN layer by pack-cementation treatment. Constituent phases and microstructures of the coating layer were carefully characterized. The results show that the Cr-layer is a Cr-Fe solid solution with {Cr,Fe} 2 N 1-x particles and Cr 2 C particles, while the AlN-layer is composed of AlN particles and α-Fe matrix. The formation of Cr 2 C and {Cr,Fe} 2 N 1-x particles in the Cr-layer is due to the drag effect of the strong carbide-forming element Cr on the carbon in ODS steel and nitridation reaction of NH 4 Cl and Cr, Fe, respectively. During high-temperature pack-cementation, N atoms in the air diffuse into the ODS steel substrate and react with Al in the steel under the catalytic action of yttria , resulting in the formation of the AlN particles. Due to the limited diffusion depth of N and the high nitrogen concentration in the surface layer, the density and size of AlN particles are distributed in a gradient. The particle size is small and high on the side of the Cr-layer, while the particles on the side near the substrate are coarse and low in density. The composite coating greatly improves the surface hardness and friction resistance of the ODS steel.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Yanling Cheng,Haoxian Huang,Xinxin Xi,Yuqiang Deng,Hainan Zhang,Chengyong Wang,Huatay Lin
Al flake was used as the filler to optimize the properties of vinyl-polysilazane based photo-curable resin derived ceramics (P-PDCs) manufactured by digital light processing. Al flake addition showed a significant inhibitory effect on the macroscopic cracking and the micrometer voids of the P-PDCs. With the Al flake content of 0.6 wt%, P-PDCs pyrolysed at 1300 °C exhibited a maximum Vickers hardness and bending strength of 9.47 GPa and 89.39 MPa, respectively. The Nano-indentation measurements showed an improvement of the elastic modulus from 74.56 GPa to 85.62 GPa, and the indentation hardness from 7.12 GPa to 12.47 GPa as the increase of the Al flake. During pyrolyzing, the pristine Al flake reacted with the pyrolysed by-product obtained hollow lamellar Al 2 O 3 phase of varying aspect ratios in the forming matrix, which acted not only as a strengthening phase on the mechanical properties but also as a channel for the release of gaseous.
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Materials Today Energy
·
2022
·
IF 9.257
Xianglei Liu,Changjian Yuan,Hangbin Zheng,Chao Song,Cheng Tian,Ke Gao,Nan Sun,Zhixing Jiang,Yimin Xuan,Yulong Ding
Calcium carbonate (CaCO 3 ) pellets are suitable for scalable solar thermochemical energy storage but suffer from low solar absorptance, poor stability, and slow reaction kinetics, which lead to low solar energy storage efficiency. Here, for the first time, we successfully achieve fast and efficient solar thermochemical energy storage via synergistically employing Al, Mn, and Fe stabilizers for improving both cyclic stability and solar absorptance, and Li 2 CO 3 promoters for accelerating decomposition of CaCO 3 pellets. The average solar absorptance is 1500% higher than that of pure CaCO 3 pellets. After 60 cycles, the energy storage density is still as high as 1671 kJ/kg with a decay rate of only 4.14%, in stark contrast to energy density of 1121 kJ/kg and decay rate of 56.73% for pure CaCO 3 pellets. The average decomposition rate is about twice as fast as that of pure CaCO 3 pellets due to enhanced Ca 2+ diffusion by doped Li 2 CO 3 . Under direct light irradiation, novel CaCO 3 pellets demonstrate high energy storage rate due to both high solar absorptance and fast decomposition rate, while pure CaCO 3 pellets cannot even reach the decomposition temperature. This work opens new opportunities for scalable deployment of direct solar-driven thermochemical energy storage techniques based on Li 2 CO 3 -doped dark CaCO 3 pellets.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Xiaolei Ren,Jinwu Bai,Xingxing Gu,Hui Xu,Bochuan Tan,Shenying Xu,Jiangyu Hao,Fang Gao,Xin Li
Imidazo-pyridazine and Bromo/Chloro-Imidazo-pyridazines are employed as the inhibitors for Al alloy in 0.1 M HCl and 0.5 M HCl solutions. The electrochemical tests and adsorption model analysis revealed that three compounds are mixed-type inhibitors and Imidazo-pyridazine exhibited the best anti-corrosion performance for Al electrode in HCl solutions by physicochemical. From electrochemical results, the best anti-corrosion efficiency is 88.1 % for Al in 0.5 M HCl with 2.0 mM IP, while the efficiency is 75.5 % for Al in 0.5 M HCl with 1.0 mM IP. The different inhibition behaviors result from the probability of the formation of AlCl - ads and N-onium ions. The formation of adsorption is due to the electrostatic attraction between AlCl - ads and N-onium ions. The surface topography test revealed that the Imidazo-pyridazine is the best corrosion barrier for Al in 0.5 M HCl. The dynamic simulation demonstrated that the inhibition molecules and protonated molecules can adsorb on the Al surface spontaneously with parallel adsorption configuration no matter in more or less Cl - atmosphere.
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WATER RESEARCH
·
2022
·
IF 13.4
Kangying Guo,Zhining Wang,Jingwen Pan,Beibei Liu,Yan Wang,Qinyan Yue,Yue Gao,Baoyu Gao
In view of the insufficient coagulation efficiency of traditional inorganic coagulants, a series of Al-Ti gels with different Ti/triethanolamine (TEA), Ti/H 2 O, and Ti/Al molar ratios were prepared by sol-gel process in this study. Fourier transform infrared (FTIR) spectra of the Al-Ti gels preliminarily confirmed the interaction between Al and Ti by detecting the appearance of the Al-O-Ti bond. The peak shift of the chemical bonds in X-ray photoelectron spectra (XPS) and the transformation of the hydrolysate species in the Al-Ti gels were analyzed to further explore the interaction mechanism between Al and Ti. It was found that moderate TEA could inhibit the hydrolysis of Ti precursors by taking up the coordination sites of H 2 O to form a C O-Ti bond. Density functional theory (DFT) calculation results showed that Ti could be incorporated into the framework of aluminum hydrolysates to form an Al-O-Ti bond, and [Al 2 Ti 2 (OH) x (TEA) y (H 2 O) 8-x-y ] 14-x was the most possible copolymerization hydrolysate. Based on the above research results, the most efficient Al-Ti gel was selected and applied to the actual lake water treatment. The highest UV 254 removal efficiency with the addition of Al-Ti gel was > 60%, nearly 25% higher than that of Ti gel. The hydrolysates of Al-Ti gel, such as TiO(OH) 2(am) , Al(OH) 3(am) , and [Al 2 Ti 2 (OH) x (TEA) y (H 2 O) 8-x-y ] 14-x , could remove organic matters through the incorporation of charge neutralization, adsorption, complexation, and sweeping effects. These results provide a new idea for studying the interaction mechanism between Al and Ti in composite coagulants, and have theoretical guiding significance to actual water treatment.
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PubMed
高影响因子
Journal of Magnesium and Alloys
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2022
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IF 11.813
Xinfang Zhang,Ruihong Li,Xiaoyan Feng,Xue Pang,Xu He,Zili Jin,Huiping Ren,Dashuang Wang,Kailin Li,Xingjian Dai,Zhilan Du,Quan Zhou,Yuxin Zhang
A hierarchical superhydrophobic Al-Li layered double hydroxide (LDH) films with different Li + /Al 3+ molar ratios of 1:1, 1:2, 2:1, pH value of 11.5 and reaction temperature of 125 °C, have been fabricated on the surface of Mg-5Li-1Al (LA51) alloys by hydrothermal method following the characteristics of controllable cation structure and exchangeable anion between layers. The properties of the films were investigated by X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). XRD and SEM results indicate that the Al-Li LDH films are successfully prepared on LA51 alloys. The contact angle (CA) was measured to be about 100.7°, indicating that the surface wettability of the film converted from hydrophilic to hydrophobic by surface modification. The corrosion resistance of Al-Li LDH films was evaluated by Tafel polarization curve and electrochemical impedance spectroscopy (EIS). Surprisingly, Tafel polarization curve and EIS test reveal that the Al-Li LDH films prepared at the molar ratio of Li + /Al 3+ 1:2, pH 11.5 and temperature 125 °C have better corrosion resistance in 0.1 M NaCl neutral solution. In addition, the formation mechanism and corrosion mechanism of the films on the surface of LA51 alloy are also proposed. It provides innovative synthetic materials and novel design ideas for the preparation of high-efficiency anti-corrosion coatings on LA51 alloys, whose application can be extended in industrial fields.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2022
·Vol. 102
·期 11
·4714-4723
·
IF 4.125
Ke Cheng,Jianghua Zhang,Shasha Yang,Fawen Yin,Zixuan Li,Ting Wang,Dayong Zhou
BACKGROUND Efficient and sustainable production of structured phospholipids (SPLs) enriched in medium-chain fatty acids (MCFAs) in a heterogeneous manner is crucial for their potential applications in functional foods and drugs. Herein, for the first time, Zn- and Al-incorporated SBA-15 silicas were prepared by the coprecipitation method and further researched for catalytic synthesis of MCFA-enriched SPLs through acidolysis reaction of natural phospholipids with capric or caprylic acid. RESULTS The as-prepared Zn- and Al-incorporated SBA-15 samples exhibited superior catalytic activities under mild experimental conditions (50 °C, 6 h) to commercial homogeneous Lewis acids and benchmark enzymes. Correspondingly, the capric acid and caprylic acid incorporations were respectively achieved up to ~40.25 ± 0.40% (or 35.08 ± 0.09%) and 37.26 ± 0.38% (or 33.02 ± 0.13%) for Zn- (or Al-) incorporated SBA-15 catalyst. Moreover, various methods such as scanning electron microscopy with energy-dispersive X-ray spectrometry, ultraviolet–visible diffuse reflectance spectroscopy and pyridine–Fourier transform infrared spectroscopy were utilized to characterize the two catalysts in order to elucidate the possible structure–performance relationship. Accordingly, the above-mentioned satisfactory results are most probably due to the well-ordered mesostructures and large amounts of active Lewis acid sites existing in the investigated materials. Noticeably, the two catalysts featured good separation and excellent recyclability as well. CONCLUSION The Zn- and Al-incorporated SBA-15 catalysts studied in this work might shed light on novel, sustainable and economic alternatives for effective SPL production to diminish the applications of conventional homogeneous catalysts and biocatalysts in food industries. © 2022 Society of Chemical Industry.
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PubMed
高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Jun Li,Qinglong Luo,Mingzhe Dong,Guoliang Nie,Zhong Liu,Zhijian Wu
Powder Li/Al-layered double hydroxides (LDHs) of Li 2 Al 4 (CO 3 )(OH) 12 ·3H 2 O were hydrothermally synthesized in one pot with sodium alginate as a structure modifier and granulated by crosslinked sodium alginate. The powder and granulated Li/Al-LDHs lithium adsorbents were characterized by FT-IR spectroscopy, XRD, SEM, TEM, XPS, and porosity. The adsorption-desorption performance of the granulated Li/Al-LDHs adsorbents was evaluated. Adsorption isotherm , adsorption kinetics , adsorption thermodynamics were investigated. The effects of solution pH, temperature, and the electrolytes (NaCl, Na 2 SO 4 , MgCl 2 , and KCl) on lithium adsorption, and the dissolution of granulated Li/Al-LDHs adsorbents after cyclic adsorption-desorption were also investigated. The granulated Li/Al-LDHs adsorbed 14.5 mg/g of lithium from the brine of East Taigener Salt Lake with a lithium concentration of 1400 mg/L. The granulation of powder Li/Al-LDHs by crosslinked alginate greatly reduced the dissolution of powder Li/Al-LDHs. The granulated Li/Al-LDHs adsorbents prepared in this report are promising materials for Li + extraction from salt lake brines.
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Materials Today Communications
·
2021
·
IF 3.383
Jinzhao Guan,Kaiyu Xie,Aimin Liu,Zhongning Shi,Gong Chen,Miroslav Boca
In this study, Al–Si alloy, a precursor of the solar-grade silicon , was prepared via the aluminothermic reduction–molten salt electrolysis of SiO 2 in KF–AlF 3 molten salt by employing liquid aluminum as the working cathode. The reaction mechanism of the aluminothermic reduction of SiO 2 in KF–AlF 3 molten salt at 750 °C was determined by thermogravimetry–differential scanning calorimetry. The reaction rate equation for the aluminothermic reduction of SiO 2 in KF–AlF 3 molten salt was: d α dt = 7.156 × 10 24 e − 4.688 × 10 5 RT ( 1 − α ) 1.734 . In 49.4 wt% KF–47.6 wt% AlF 3 –3 wt% SiO 2 molten salt at 750 °C, the Si content in the Al–Si alloy obtained by the aluminothermic reduction–molten salt electrolysis of SiO 2 was 24.53 wt%. Compared with solely aluminothermic reduction of SiO 2 , the current efficiency in the process of the aluminothermic reduction–molten salt electrolysis of SiO 2 was evaluated. The results reveal that the Al–Si alloy is predominantly prepared in the aluminothermic reduction step, while supplemented by electrolysis. The calculated Faradic current efficiency of the proposed aluminothermic reduction–molten salt electrolysis process was 28.4%.
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2026
·
IF 4.7
Tao Guo,Qiulin Niu,Lu Jing,Tao Zhong,Chenyi Zhu,Binghui Wu,Shengfeng Zhang,Shibo Guo
To improve h-BN dispersion and the local interfacial environment in WC-based cemented carbides, an h-BN@Al₂O₃ composite powder was prepared by heterogeneous nucleation and calcination, with h-BN as the designed core phase and Al₂O₃ as the designed outer-layer component. The composite powder was incorporated into WC-based cemented carbides consolidated by spark plasma sintering (SPS), and the effects of powder content and sintering temperature on phase composition, microstructure, mechanical properties, and densification characteristics were examined. The h-BN@Al₂O₃ content was closely related to WC grain size, microstructural uniformity, and porosity. At 1300 °C, the specimen containing 5 vol% h-BN@Al₂O₃ had a fine, relatively homogeneous microstructure with few visible pores; higher additions increased porosity and local particle agglomeration. For the 5 vol% composition, raising the sintering temperature from 1100 to 1400 °C increased the relative density and reduced visible porosity. At 1500 °C, local WC grain coarsening, microstructural inhomogeneity, and residual porosity increased, accompanied by lower mechanical properties. The best overall performance was obtained with 5 vol% h-BN@Al₂O₃ at 1400 °C: a relative density of 99.1 ± 0.4%, flexural strength of 871.3 ± 26 MPa, Vickers hardness of 1912.1 ± 38 HV, and fracture toughness of 9.86 ± 0.2 MPa·m 1/2 .
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危险品化学品经营许可证（带存储）