JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 27
·15463-15480
·
IF 4.22
Chen Tianchi,Guo Jie,Zhang Yingying,Hu Ningning,Zhang Jialu
Due to the construction of complicated micro-/nanohierarchical structures, designing durable superamphiphobic Al surfaces by a simple, environmentally friendly, and fast method remains a great challenge. In this article, we used a simple and environmentally friendly technique that includes laser marking and water boiling treatment to create triple-scale micro-/nanostructures on 1060 Al surfaces. The as-prepared 1060 Al surfaces revealed excellent superamphiphobicity with low sliding angles, owing to great Cassie state stability after 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS-17) modification. The contact angle of the water droplets reaches 160°, and that of peanut oil droplets reaches 155° on this surface. Meanwhile, this superamphiphobic Al surface also possesses excellent self-cleaning ability and oil resistance. Even when entirely immersed in oil sludge, the as-prepared Al surfaces can retain superamphiphobicity. Furthermore, the as-prepared superamphiphobic Al surface demonstrates outstanding chemical stability and endurance in a variety of application environments. In addition, the as-prepared superamphiphobic Al surface offers potential anti-icing and anti-frosting properties. Therefore, the as-prepared superamphiphobic Al surface will be a potential candidate with broad applications in aerospace, construction, and marine industries. Graphical abstract
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 36
·期 2
·149-156
·
IF 1.692
Shi Tong,Zheng Quan-De,Zuo Wei-Wei,Liu Shao-Feng,Li Zhi-Bo
Two types of bifunctional bis(salicylaldimine) ligands ( syn - L and anti - L ) were designed and synthesized to support bimetallic aluminum complexes. Owing to the rigid anthracene skeleton, syn - L and anti - L successfully locked two Al centers in close proximity ( syn - Al2 ) and far apart ( anti - Al2 ), respectively. The distance between two Al centers in syn - Al2 was defined by X-ray diffraction as 6.665 Å, which is far shorter than that in anti - Al2 . In the presence of stoichiometrical BnOH, syn - Al2 and anti - Al2 were both efficient for ring-opening polymerization (ROP) of rac -LA with the former being more active. In the presence of excess BnOH, syn - Al2 showed an efficient and immortal feature, consistent with high conversions, matched M n s, narrow molecular weight distributions and end group fidelity, while anti - Al2 had a much lower activity or even became entirely inactive due to rapid decomposition, indicated by in situ 1 H-NMR experiments of Al complexes with BnOH.
研究领域:
化学
·
高分子科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Xiao-lu Fan,Jin-lan Xia,Duo-rui Zhang,Zhen-yuan Nie,Yun-peng Liu,Li-juan Zhang,Da-yi Zhang
A novel sinter method using ZnO as the activator instead of the conventional Na 2 CO 3 /CaCO 3 , (NH 4 ) 2 SO 4 , and K 2 S 2 O 7 was developed to achieve efficient sequential extraction of rare earth elements (REEs), alumina (Al), and silica (Si) from coal fly ash (CFA). Up to 93.3% Si, 87.1% REEs (70.7% Ce, 82.5% La, 83.2% Gd, 87.1% Nd, 62.3% Dy, and 81.7% Y), and 92.9% Al were extracted from CFA, respectively. Moreover, 93.1% of the ZnO activator was efficiently recycled, and the yield of red mud was only 14.9%. X-ray diffraction (XRD) and X-ray absorption near edge structure (XANES) results showed that the speciation transformation of Al/Si during CFA/ZnO roasting was as follows: mullite , quartz, amorphous Al 2 O 3 , and SiO 2 → Zn 0.75 Al 1.5 Si 1.5 O 6 , kyanite and willemite → gahnite and quartz/cristobalite solid solutions . The change in the REEs occurrence mode hinted at the migration of most REEs in aluminosilicates forms with Si during roasting, and disassociation with Si into the acid-soluble form after alkali leaching. These results indicate that the coupling of Al-Si-REE in CF was broken by this ZnO sinter method, promoting the sequential and efficient extraction of REEs, Al, and Si from CFA. This study provides a green and efficient strategy for element recovery from CFA, substantially reducing residues and favoring REEs concentration.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jiayan Wu,Jieyu Liu,Pingxiao Wu,Leiye Sun,Meiqing Chen,Zhongbo Shang,Quanyun Ye,Nengwu Zhu
The ubiquitous Al 2 O 3 is anticipated to interact with nanoplastics , affecting their fate and transport in aquatic environments. In this study, the heteroaggregation and deposition behaviors of polystyrene nanoplastics (PSNPs) on Al 2 O 3 were systematically investigated under different conditions (ionic strength, pH, and natural organic matter). The results showed that significant heteroaggregation occurred between PSNPs and Al 2 O 3 particles under acidic and neutral conditions. When the NaCl concentration was increased from 50 to 500 mM, the heteroaggregation ratio gradually increased. However, poly (acrylic acid) (PAA) inhibited the heteroaggregation of PSNPs-Al 2 O 3 due to steric repulsion. The deposition of PSNPs on Al 2 O 3 surfaces was inhibited as the NaCl concentration or pH values increased. Due to charge reversal and steric repulsion, humic acid (HA) and fulvic acid (FA) prevented the deposition of PSNPs onto Al 2 O 3 surfaces, and the former was more effective in reducing the deposition rate . The interaction mechanism between PSNPs and Al 2 O 3 was revealed by using various characterization techniques and density function theory (DFT) calculation. The results demonstrated that in addition to the dominant electrostatic interaction, there were also weak hydrogen bonds and van der Waals interactions. Our research is of great significance for predicting the migration and fate of PSNPs in aquatic environments.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 18
·8514-8523
·
IF 7.79
Xiaodan Huang,Xiaojun Wei,Yan Zeng,Lihong Jing,Haoran Ning,Xiaodan Sun,Yingying Li,Di Li,Yuanping Yi,Mingyuan Gao
Spinel oxide nanocrystals are appealing hosts for Cr3+ for forming persistent luminescent nanomaterials due to their suitable fundamental bandgaps. Benefiting from their antisite defect-tolerant nature, zinc gallate doped with Cr3+ ions has become the most studied near-infrared (NIR) persistent luminescent material. However, it remains challenging to achieve persistent luminescence from its inexpensive analogs, e.g., zinc aluminate (ZnAl2O4). Because the radius difference of the cations in the latter system is bigger, it is intrinsically unfavorable for ZnAl2O4 to form Zn–Al antisite defects under mild conditions. Herein, we report a wet-chemical synthetic route for preparing Cr3+-doped ZnAl2O4 nanoparticles with long NIR persistent luminescence. It was demonstrated that methanol (MeOH) as an important component of the mixed solvent played a critical role in tailoring the morphology of the resulting ZnAl2O4:Cr nanocrystals. It could particularly drive the formation of antisite defects in the resulting coral-like nanoparticles bearing zinc-rich cores and zinc gradient peripheries. To disclose the effects of MeOH on the formation of antisite defects as well as particle morphologies, small molecules released during the pyrolysis of metal acetylacetonate precursors were analyzed by using gas chromatography-mass spectrometry. In combination with density functional theory (DFT) calculations, it was found that MeOH can effectively catalyze the thermolysis of metal acetylacetonate precursors, in particular Zn(acac)2. Therefore, MeOH exhibits remarkable effects on the formation of antisite defects by balancing the decomposition rates of Zn(acac)2 and Al(acac)3 through its volume fraction in the reaction system. This work thus constitutes a hitherto less common strategy for achieving NIR persistent luminescence from Cr3+-doped ZnAl2O4 nanoparticles by engineering the cation defects under mild conditions.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2022
·Vol. 36
·期 1
·327-341
·
IF 1.675
Li Pengwei,Li Jie,Wang Yonglun,Yao Kai,Shan Shuo,Suo Xing,Ma Saisai
Praseodymium (Pr)–aluminum (Al)-co-doped M-type barium ferrite with Ba 0.85 Pr 0.15 Fe 12-x Al x O 19 ( x = 0.0–1.0) was prepared by combining solid-phase sintering with high-energy ball milling. The samples were characterized using a thermogravimetric analyzer, X-ray diffractometer, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and vibrating sample magnetometer. Thermogravimetric analysis indicated that M-type barium ferrite was formed at 1250 °C. X-ray diffraction patterns showed that Al doping did not destroy the crystal structure of barium ferrite. Field emission scanning electron microscopy showed that the samples had a hexagonal crystal structure. The wave numbers of Fourier transform infrared spectroscopy in the 597–607 and 452–459 cm −1 bands represent tetrahedral and octahedral clusters, respectively. With the increase in the amount of Al doping ( x ) from 0.0 to 1.0, the saturation magnetization ( M s ) and residual magnetization ( M r ) decreased continuously, and the magnetic anisotropy field ( H a ) and coercivity ( H c ) increased significantly.
研究领域:
材料科学
·
无机化学
·
磁性材料
·
固体物理
✓ 已验证
DOI
高影响因子
FirePhysChem
·
2024
·
IF 0
Jiashuai Wang,Bo Wu,Lingfeng Yang,Yuan Bian,Renjie Li,Ke Zeng,Juan Zhu,Liangyou Zhao,Jinpeng Shen,Chonghua Pei
Thermites are widely used in propellants, explosives and ignition materials because of their high heat release rate and good combustion efficiency. Structural control over thermites to achieve improved performance leads to a promising research area. Among these, core-shell structured composites have attracted wide attention due to their excellent properties and close contact among components. Herein, core-shell structured α -AlH 3 /Fe 2 O 3 thermites were prepared, which exhibit high heat-release and excellent combustion performance. At an equivalence ratio of 2.0, the core-shell structured α -AlH 3 /Fe 2 O 3 has the most heat release (1213.8 J/g) and the lowest reaction activation energy (147.5 kJ/mol). The ignited combustion performance of α -AlH 3 /Fe 2 O 3 was notably strengthened by the shorter ignition delay period (11 ms). Interestingly, the core-shell structured α -AlH 3 /Fe 2 O 3 was less sensitive to electrostatic discharge, which suggests that the core-shell structured α -AlH 3 /Fe 2 O 3 reaches the goal of high energy release and electrostatic safety. The core-shell thermite system with α -AlH 3 as metal fuel could provide an efficient alternative to hunt for thermites with high reactivity.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
DOI
ACS Applied Engineering Materials
·
2023
·
IF 0
Peng Liu,Xiulin Huang,Zhiguang Guo
Based on the ion exchange properties of hydrotalcite, dense hydrotalcite films with citric acid or tetraborate ions were prepared by a one-step hydrothermal method on aluminum flake, and superhydrophobic modified by sodium laurate to obtain a superhydrophobic corrosion resistant film with a water contact angle of about 154° and a sliding angle of less than 5°. The super hydrophobicity of the film can greatly slow down the infiltration of water and corrosive ions. The LDHs can release corrosion inhibitor ions to promote the formation of the passivation layer and can absorb chloride ions to reduce the corrosion of the metal. In addition, a very uniformly grown hydrotalcite film was obtained using urea. Electrochemical analysis of the coating after immersion in 3.5 wt % NaCl solution has shown that U-LDH-SC/SL film has the most positive corrosion potential (−0.056 eV), the best corrosion resistance, and long-term stability, which is related to the larger layer spacing and more uniform growth.
研究领域:
材料科学
·
表面工程
·
腐蚀防护
✓ 已验证
DOI
GEODERMA
·
2022
·
IF 7.422
Ke-wei Li,Hai-long Lu,Jackson Nkoh Nkoh,Zhi-neng Hong,Ren-kou Xu
Soil acidification is an increasing challenge to food security due to the production of free aluminum ion (Al 3+ ) that is toxic to crops. The production of exchangeable Al 3+ in soils during acidification is a complex process and its specific mechanism is not clear. In this study, kaolinite, montmorillonite, and three acidic soils (two Ultisols and one Alfisol) were used to investigate the changes in exchangeable and soluble Al with pH using a constant pH automatic potentiometric titrator. The effect of soil organic matter (SOM) on soil pH and Al change was also investigated. The results showed that montmorillonite consumed more acid than kaolinite under the same conditions, which were consistent with the larger cation exchange capacity (CEC) of montmorillonite than kaolinite. When the pH was adjusted from 4.8 to 4.3, the exchangeable Al of montmorillonite was significantly higher than that of kaolinite. This was consistent with their CEC and indicated that montmorillonite adsorbed more H + than kaolinite at the same pH, resulting in more exchangeable Al on its surface. Besides CEC, SOM shows a significant effect on acid buffering capacity and Al activation of acid soils. When acidified to the same pH, the content of exchangeable Al in Alfisol was larger than that in Ultisols. This observation was consistent with the larger CEC and smaller organic matter content of Alfisol. The presence of more organic matter in the Ultisols not only improved their acid buffering performance, but also inhibited the production of exchangeable and soluble Al. In conclusion, CEC of soils and minerals play an important role in soil acid buffering performance. While, SOM not only improves soil acid buffering performance, but also inhibits the mobilization of soil Al.
研究领域:
土壤学
·
环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
S.H.E.N. Ya-Qiang,L.I. Dong-Yun,X.U. Yang,G.E. Hong-Liang,X.U. Qiang,Y.A.N.G. Hui
High purity ultrafine alumina powders with different crystalline phases and morphologies were prepared by solid-phase sintering method. The influence mechanism of halides on the particle characteristics of alumina powders was studied. The results showed that NH 4 F additives induced the conversion of metastable alumina to α-alumina at high temperature, lowered the phase transformation temperature of α-alumina by about 300 °C, increased the α-alumina conversion rate by about 11.6%, reduced the sodium oxide content by about 72.3 wt%, and caused the alumina crystals to grow in a platelet shape manner. By comparison, NH 4 Cl additives had less effect on the transition temperature of α-alumina and the impurity content, and the particle morphology of alumina was a mixture of vermicular and platelet shapes. This study revealed the influence mechanism of two kinds of halides on the phase conversion, morphology evolution, and sodium removal of alumina powders from sintering mechanism and the theories of crystal structure, adsorption on the solid surface, and electronegativity of atoms.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 2
·026401
·
IF 1.929
Guoyong Liu,Yuan Yuan,Zhou Jiang,Jiang Youdong,Wang Liang
Superhydrophobic (SHP) surfaces had promising application in anti-icing field. In this work, ZnO SHP surfaces were prepared on aluminum alloy by radio frequency (RF) magnetron sputtering. The structure, chemical composition, morphology, wettability of the SHP surfaces were investigated by using corresponding methods. The anti-frosting/anti-icing performance of the ZnO SHP surfaces were investigated. Morphology of surfaces showed that sputtering time affected the surface morphology of the ZnO surfaces. When the sputtering time was 15 min, the rough structure exhibited excellent anti-frosting/anti-icing property due to the exceptional superhydrophobicity and self-transfer behavior at subzero temperature, which composed by densely gathered nanoclusters. The freezing of water droplets was delayed for about 2 h, and frosting was delayed for approximately 5 h at the temperature of −10 °C. The SHP surfaces could efficiently enhance the anti-icing property in glaze ice. Meanwhile, the as-prepared ZnO SHP surfaces displayed a low ice-adhesion strength of 12 ± 4.7 kPa. However, the structure with large undulation and pore space reduced the anti-frosting/anti-icing property of the SHP surface. This work provided a direction for the design and preparation of anti-icing surfaces for power transmission lines.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 6
·994
·
IF 3.9
Jiangang Lv,Di Wang,Luming Peng,Xuefeng Guo,Weiping Ding,Weimin Yang
Highly efficient and stable catalysts are among the key factors in industrial ethanol dehydration to ethylene. Among the widely studied catalysts, alumina is the most suitable for industrial application. In this study, novel gamma alumina was synthesized by solvent protection and a hydrothermal procedure. HRTEM, XRD, FT-IR, NH3-TPD, H-D exchange, and29Si MAS NMR were employed to compare the difference in physicochemical properties between the novel gamma alumina and commercial alumina. Characterization results show that the as-synthesized novel gamma alumina mainly exposes the high-energy crystal plane (111) while the commercial alumina mainly exposes the thermostatically stable (110) crystal plane. The dominating (111) plane, according to the characterizations, endows the novel gamma alumina with a higher density of surface hydroxyl groups, higher acid content, and higher surface energy compared to the commercial alumina. The catalytic performance of the two catalysts for industrial ethanol dehydration to ethylene was studied. The novel (111) plane-exposed alumina showed a higher yield of ethylene than commercial alumina under the same reaction conditions. This could be related to the difference in atomic arrangement and the unsaturated aluminum coordination of different crystal planes. Stability testing under severe reaction conditions (450 °C, 1 MPa, 4 h−1) indicates that novel gamma alumina shows better stability (catalyst life cycle increased by 50%) and produces less acetaldehyde as a byproduct. The effects of steam treatment on the catalytic performance were further investigated. The surface acidity and the catalytic performance of novel gamma alumina present a volcanic curve with the increase in steam treatment temperature. Under the optimal water vapor treatment temperature of 650 °C, the conversion of ethanol and selectivity of ethylene were both higher than 99%.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）