APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Jiao Li,Jian Zhang,Yulin Yang,Kaifeng Lin,Debin Xia
The oxide layer on the Al particle surface seriously limits application in solid propellants, resulting in low combustion efficiency. This work prepares a series of Al decorated by nano-silver (namely Al/Ag) via in-situ reduction to enhance combustion performance Thanks to silver’s smaller specific heat capacity, surplus heat energy is transferred to the Al core through a tight combination with decorated noble metal nanoparticles. Along with the intermetallic reaction, the thermal stress on Al would accelerate the oxide shell rupture to reduce the oxygen gas diffusion barrier during combustion. The oxidation temperature of Al/Ag-2 composites decreases from 1017.3 °C to 982.93 °C. Hence, the combustion performance of solid propellants containing Al/Ag composites is improved with the higher maximum flame temperature and emission spectra intensity. In addition, the thermal decomposition of ammonium perchlorate (AP) is catalyzed via nano-silver. The combustion efficiency of the propellant containing Al/Ag-2 is effectively improved by the synergistic effect in which the potential energy from Al and AP is exploited as far as possible. This work demonstrates that metal surface modification significantly improves the combustion performance of solid propellants.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xiangyun Sun,Changping Ke,Qifa Lu,Long Liang,Guangyuan Xie
This study developed a novel fluoride ion adsorbent material (Al/La-A) for efficient removal of fluoride ions in water. The crystal structure, elemental composition, surface morphology, specific surface area, thermal stability and surface electronegativity before and after modification were explored using FTIR, XRD, XPS, SEM-EDS, BET, TG-DSC, and zeta potential measurements. Results showed that the fluoride ion adsorption capacity of Al/La-A reached 130.42 mg/g, with the surface area increasing from 65.66 m 2 /g to 111.68 m 2 /g, respectively, compared to unmodified attapulgite. Al/La-A maintained excellent fluoride ion removal performance over a wide pH range, with the best adsorption at pH 2. Coexisting ion experiments indicated weak competitive adsorption effects of Cl - , SO 4 2- , and HCO 3 – , with fluoride ion adsorption remaining above 100 mg/g in the presence of different concentrations of coexisting anions. After 5 adsorption–desorption cycles, Al/La-A exhibited strong adsorption capacity and reusability. The fitting of Langmuir adsorption model and pseudo-second-order kinetic model to the adsorption of fluoride ions on Al/La-A indicated that the adsorption of fluoride ions on Al/La-A was primarily monolayer chemical adsorption. The adsorption mechanism of fluoride ions involved electrostatic interactions, ion exchange, and coordination complexation. This study provides a new research approach for the optimal utilization of attapulgite-based adsorbent materials and the efficient removal of fluoride-containing wastewater.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Xiqi Su,Wenwen Sun,Le Wang,Xiao Zhang,Mengxia Liu,Yi Qu,Li-June Ming
Quercetin (Qr) is a common flavonoid widely found in plants with promising pharmacological activities. It is thus worthwhile to design a convenient method for its detection. In this work, a specific Al 3+ -regulated poly(cyclotriphosphazene- co -curcumin) (PC-Al) micro-probe was designed for real-time detection of Qr, therein significant “turn-on” fluorescence was observed after addition of Qr to PC-Al. Under optimal conditions, the probe has a detection limit of 23.2 nM for Qr sensing with good linearity in the range of 0–5 × 10 −5 M. Moreover, real-time applications of the PC-Al probe in red wine, orange juice, and honey samples were validated. Furthermore, assisted by a consumer smartphone sensing platform, the sensor shows an excellent linear response between the red/blue ratio (R/B) of the two color channels in the picture and the concentration of Qr in the range of 1–120 μM, achieving quantitative detection of Qr. The introduction of smartphone system to realize convenient detection of Qr demonstrates good application prospects of this Al 3+ -mediated fluorescence probe.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 22
·2310925
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IF 18.5
Xiangbiao Liao,Xiao Wang,Chong Yan,Baidu Zhang,Yong Ni,Haozhi Yuan,Yong Pan,Jun'an Pan,Jiaqi Huang
The all-in-one design of cathode and anode is a promising strategy to improve energy density and assembly efficiency for lithium batteries. However, it is an important prerequisite to combine negative and positive current collectors in a single sheet. Here, an asymmetric structure of bipolar composite current collector (BCCC), thin copper (Cu) and aluminum (Al) metal layers respectively deposited on each side of a thin polyethylene terephthalate (PET) polymer substrate is developed. Unlike conventional metal foils, the electronically insulative polymer blocks electron transfer between the cathode and anode coated on each side of BCCC. Buckling-based mechanics measurement and molecular simulation are conducted to quantitatively evaluate the interfacial strength of metal/polymer, which is enhanced by introducing an intermediate chromium (Cr) layer. For applications in anode-free wound batteries, the integrated sheet of separator/cathode/BCCC can simplify the alignment of the electrodes during the winding process. Without special surface and electrolyte optimizations, a higher Coulombic efficiency (99.1%) and larger capacity retention (50.0%) are achieved after 100 cycles in the LiNi 0.8 Co 0.1 Mn 0.1 O 2 anode-free battery than the battery using Cu foils.
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ENERGY
·
2024
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IF 9
Deshi Yang,Jianpeng Huang,Zhipeng Hu,Shiqi Qin,Jiaxin Mu,Fengqiang Wang,Zhijun Zhang,Yanjun Xie,Shouxin Liu,Qingwen Wang
Catalytic fast pyrolysis (CFP) of lignin aiming monocyclic aromatic hydrocarbons (MAHs) is attractive. Five metal oxide catalysts (named c-Nb 3 Al x ) with different Nb/Al ratios, c-Nb, c-Al, c-Nb 3 Al 1 , c-Nb 3 Al 2 and c-Nb 3 Al 3 were synthesized and applied to CFP of lignin. Among these catalysts, c-Nb 3 Al 2 exhibits excellent deoxygenation ability and the highest selectivity for MAHs (77.0 %). The selectivity and deoxygenation capacity of c-Nb 3 Al 2 for MAHs were higher than H-ZSM-5 (25) as a control. It was attributed to the large external surface area (90 m 2 g -1 ), mesoporous structure (16.15 nm) and high acid amount (2.00 mmol NH 3 /g cat ) of c-Nb 3 Al 2 . The c-Nb 3 Al 2 has good stability and can be regenerated by simple calcination . The selectivity of the regenerated c-Nb 3 Al 2 for MAHs was still high at 70.1 %. Guaiacol was used to compare the difference in the deoxygenation capacity of c-Nb 3 Al 2 and H-ZSM-5.
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ENVIRONMENTAL ENGINEERING SCIENCE
·
2024
·
IF 1.8
Yiting Wang,Mingze Xu,Jinhua Li,Tingsong Zhang
Titanium dioxide (TiO2) has been widely studied as a photocatalyst owing to its advantages of low cost, good stability, and nonpollution. However, they can only be excited by ultraviolet light, resulting in low utilization of solar energy and limited photocatalytic efficiency. In recent years, researchers have found that the nonprecious metal Al can effectively improve the photocatalytic performance of TiO2. However, the current studies focus only on enhancing the ultraviolet photocatalysis performance of semiconductors with Al on the substrate. In this study, Al nanoparticles (NPs) and TiO2 were prepared into composite materials. The effects of ligand, Al particle size, and the molar ratio of Al and TiO2 on the photocatalytic degradation of methylene blue (MB) by Al NPs and TiO2 composites (Al NPs/TiO2) were investigated. The results showed that the Al NPs/TiO2 prepared with a particle size of 200 nm of Al, glutathione as the ligand bridge, and an Al:TiO2 ratio of 2:1 were the most effective for the degradation of MB. The degradation rate of 5 mg/L MB solution within 70 min under visible light was up to 99.5%, which was three times higher than that of P25 TiO2. The photocatalytic performance was further enhanced under sunlight with a degradation rate of 99.7% within 50 min, which is four times higher than that of P25 TiO2 under the same light source. Therefore, Al NPs/TiO2 is a potential photocatalytic material for the treatment of organic pollutants in water.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yu Zhang,Xu Shen,Qin Ma,Shuang Mu,Shaoming Dong,Jinshan Yang
The wet oxidation behavior of LPS-SiC ceramics as well as the synergistic modification effect of Al 2 O 3 and Y 2 O 3 as sintering aids are investigated. The results show that SiO 2 oxide scale is transformed to aluminosilicate with the addition of Al 2 O 3 , which can inhibit the crystallization of oxide layer and formation of cracks. The aluminosilicate oxide layers have low k l value close to zero, which can reduce the consumption of protective oxide layer under water-containing atmosphere. Y 2 O 3 are mainly transformed to Y 2 Si 2 O 7 to resist the diffusion of oxidative gas. However, with the increase of sintering aids content, the aluminosilicate layer with excessive viscosity limits the emission of gas generated by oxidation and causes many bubbles left in oxide scale which provided rapid channel for oxidative gas. Therefore, LPS-SiC with lower content of sintering aids has better oxidation resistance. This work can provide guidance for the component design of SiC-based ceramics and composites.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
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IF 3.498
Fang Wang,Xiao-Ni Yao,Yao Guo,Liguo Yang,Yi-Gang Chen,Xian-Ming Zhang
Two new metal aluminium phosphate millimetre-crystals NaBa 2 Al(P 2 O 7 ) 2 and NaBaAl(PO 4 ) 2 were successfully grown by using high-temperature molten method. The crystals NaBa 2 Al(P 2 O 7 ) 2 and NaBaAl(PO 4 ) 2 are located in space groups P ¯1 and P 2 1 /c, respectively. NaBa 2 Al(P 2 O 7 ) 2 displays a [Al(P 2 O 7 ) 2 ] 1D chain structure constructed from corner-sharing linkage of novel AlP 4 O 16 9− anion groups, and the AlP 4 O 16 9− group is formed by edge-sharing connection of two P 2 O 7 dimers and one AlO 6 octahedron . However, NaBaAl(PO 4 ) 2 exhibits a new [Al(PO 4 ) 2 ] 2D layer structure composed of AlP 2 O 10 7− anion groups via corner-sharing, and the AlP 2 O 10 7− group is generated by alternate linkages of corner-sharing PO 4 and AlO 4 tetrahedra. Analysis based on Pauling's electrostatic rule and Brown's bond valence model finds that structural feature of the two anion groups is mainly responsible for their different dimension structures in addition to structure-directed role of large Ba 2+ . The two crystals manifest a deep-UV optical transparency below 190 nm and good thermal stability, making them a potential optical window material. First-principles calculations reveal that the optical bandgaps of both crystals are determined by the Ba–O groups, rather than Al–O and P–O common groups.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Qing Zhou,Kaiyu Lin,Yongxin Liu,Guohan Sun,Shumei Wang,Haiyun Zhai
A novel nonenzymatic electrochemical sensor with high sensitivity for detecting organic phosphate (OPS) in medicinal herbs was fabricated based on a Mg-Al layered double hydroxide (Mg-Al LDH) nanocomposite glassy carbon electrode (GCE) modified with a poly-m-amino-benzenesulfonic acid (p-m-ABSA) film. Depositing Mg-Al LDH nanocomposites onto the surface of the p-m-ABSA composite resulted in an effective electrical response by increasing the electrode surface area and enhancing the electron transfer process, so the electrocatalytic activity was significantly enhanced. The research illustrated that the fabricated sensor (Mg-Al LDH/p-m-ABSA/GCE) exhibited strong affinity, high sensitivity, and selectivity towards methyl parathion (MP) and fenitrothion (FNT). Scanning electron microscopy (SEM) was used to characterize the surface morphology of the modified electrode and showed that the p-m-ABSA film and a few p-m-ABSA nanoparticles were coated on the surface. The surface area of the electrode was further enlarged by Mg-Al LDH owing to their layered nanostructure. Under optimal conditions, the anodic current had a linear relation equal to 0.1∼20.0 µM MP and 0.01∼50.0 µM FNT, with detection limits (S/ N = 3) of 33.0 nM MP and 3.5 nM FNT, respectively. Furthermore, Mg-Al LDH/p-m-ABSA/GCE was successfully used for the detection of MP and FNT in Astragalus and Magnolia medicinal herb samples.
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COMBUSTION SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.5
Wenke Zhang,Jianzhong Liu,Huanhuan Gao,Haitian Gong
To investigate the detailed combustion processes of solid propellant components near the burning surface, this study develops a microscopic ignition and combustion experimental method and establishes a corresponding test system. A high-power microscope and image sensor are employed to continuously record the ignition and combustion of thin-film solid propellants (TFSP, AP/HTPB/Al). By integrating existing theories with image processing techniques, the combustion behavior of AP, Al, and the TFSP as a whole is analyzed in detail. A refined combustion surface model is constructed based on decomposition results, offering theoretical support for ignition combustion modeling and its integration with agglomeration models. Quantitative analysis reveals that reducing AP particle size in TFSP significantly enhances burning rate and combustion surface irregularity. This approach enables the observation of finer combustion behaviors and provides a novel perspective for solid propellant ignition and combustion research.
研究领域:
固体推进剂燃烧
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微观分析
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燃烧建模
·
含能材料
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高影响因子
Gels
·
2025
·Vol. 11
·期 11
·929
·
IF 5.3
Mingkang Wang,Shuai Yu,Jing Wang,Xin Zhao,Changpeng Yang,Ran Wei,Chun Liu,Sizhao Zhang
Polyimide aerogels have garnered considerable attention due to their high-performance combination of a lightweight nature, low thermal conductivity, and high mechanical strength, which renders them ideal candidates for thermal insulators in aerospace. However, the inherent conflict in achieving multifunctional (dimensional stability and mechanical stiffness at high temperatures, and highly efficient thermal insulation) integration presents a great challenge. Here, we present an aerogel skeleton construction strategy based on hybridizing an Al–O network phase to create multifunctional polyimide aerogels. The resulting aerogels partially constructed by Al–O network phase exhibit an outstanding resistance to high temperatures (shrinkage of 0.56% after experiencing 200 °C for 2400 s), which is markedly superior to that of conventional polyimide aerogels. The excellent insulation capability of the aerogel is reflected in its low thermal conductivity (0.0214 W m −1 K −1 ) and its ability to maintain a cold-side temperature of just 59.7 °C under a 150 °C heat source. Furthermore, remarkable enhancements in mechanical properties are found at high-temperature conditions, providing evidence for the compressive stresses of 0.329 and 0.394 MPa under 3% strain at the respective temperatures of 200 and 250 °C, showing a clear trend of enhanced compressive stress with rising temperature. These advancements in high-temperature stability and mechanical properties substantially broaden the scope for their potential applications in aerospace thermal protection systems.
研究领域:
材料科学
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航空航天工程
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热防护系统
·
聚合物纳米复合材料
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PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 104
·60025-60033
·
IF 3.708
Juan Chen,Lihua Jia,Xiangfeng Guo,Lijun Xiang,Shengfeng Lou
A series of KF-modified Ca–Al hydrotalcite (xKF/HTL-M) solid base catalysts was prepared in methanol, and characterized by thermogravimetry analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and carbon dioxide temperature-programmed desorption (CO2-TPD). The catalytic activity was investigated in the transesterification of ethylene glycol monomethyl ether (EGME) with methyl laurate (ML) to produce a novel biodiesel of ethylene glycol monomethyl ether monolaurate (EGMEML). The effect of the mass content of KF and the main reaction parameters such as EGME to ML molar ratio, amount of catalyst, reaction time and temperature on the yield of EGMEML were examined. The results indicate that a new phase of KCaF3 formed in xKF/HTL-M, and acted as the main active sites for the transesterification. In addition, xKF/HTL-M has excellent catalytic performance in the production of EGMEML. The highest yield of 97.7% was obtained over 24.7KF/HTL-M at EGME/ML molar ratio of 3.0, catalyst amount of 5 wt%, and reaction time of 4 h at 120 °C. Moreover, the catalyst displays a good stability and reutilization. A satisfactory yield of 90% was obtained after use for five consecutive cycles without significant deactivation. Finally, the activation energy (Ea) of the reaction of EGME with ML over 24.7KF/HTL-M was obtained as 27.11 kJ mol−1.
研究领域:
化学工程
·
催化材料
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危险品化学品经营许可证（带存储）