Nanomaterials
·
2025
·Vol. 15
·期 11
·797
·
IF 4.3
Mingbo Guo,Yijun Wang,Lei Zhang,Junran Lu,Chang Gong,Wanning Zhang,Yuxi Fang,Xinyuan Zhu,Shunai Che
Size restrictions pose increasing challenges to the acoustic performance of microspeakers in portable devices as the size of such devices, and thus the back volume of microspeakers, continues to shrink. Filling the back volume with porous materials, such as zeolites, has been proved to be an effective strategy for improving acoustic performance. In this work, hierarchically structured ZSM-5 zeolites with abundant mesopores were synthesized via the traditional hydrothermal method by adjusting the SiO2/Al2O3ratios (SAR), and their pore structures and morphologies were systematically investigated. Their acoustic enhancement performance was evaluated using a commercial microspeaker. Based on their acoustic properties, the influence of pore structure on acoustic performance was further studied. The ZSM-5 zeolite sample with an SAR of 614, which exhibited the maximum mesopore volume, demonstrated exceptional acoustic enhancement performance with a resonance offset of 199.53 Hz and an enhanced sound pressure level of 4.74 dB at 500 Hz. The presence of mesopores significantly facilitates diffusion within the zeolite crystals, enabling air molecules to access more micropores for efficient sorption–desorption processes during diaphragm vibration in microspeakers. Furthermore, supermicropores were found to contribute to improved performance by adsorbing air molecules during diaphragm vibration, complementing the role of micropores.
研究领域:
材料科学
·
声学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Jingjie Cao,Mingwei Ma,Jinchan Liu,Yongquan Yang,Hui Liu,Xingliang Xu,Jiahui Huang,Huijuan Yue,Ge Tian,Shouhua Feng
Aluminum ion-exchanged Ca-montmorillonite with different concentrations of aluminum ion were prepared and applied in the conversion of carbohydrates to 5-hydroxymethylfurfural (HMF). It was found that two types of acid sites were present in the catalyst, Lewis acid sites for isomerization of glucose and Brønsted acid sites for dehydration of fructose. With Al-mont-10 as catalyst, the yield of HMF converted from glucose was 80.4% in a biphase system (THF: NaCl solution) at 180 °C for 2.5 h. Further, the catalyst also shows excellent catalytic performance in the conversion of starch and inulin, and the yield of HMF reached 60.1% and 81.6% under identical conditions, respectively.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Shuyang Shi,Baozhong Ma,Hui Yang,Zhihe Cao,Yubo Liu,Yongqiang Chen,Chengyan Wang
In bauxite-scarce China, aluminum extraction from alternative resources via the acid leaching process is promising. However, critical gaps persist: (1) pyrolysis yields lightweight alumina with limited market capacity, and (2) direct electrolytic alumina synthesis from acid leach liquor remains unexplored, especially alumina particle size control. The production of coarse boehmite as an alumina precursor via high-temperature autohydrolysis was investigated in this paper. First, the hydrolysis characteristics of Al 3+ were revealed by thermodynamic analysis. Subsequently, the experimental parameters and hydrolysate particle size were optimized through a series of experiments. Under optimal conditions, an Al hydrolysis ratio of 82.6 % and a median particle size of 27.1 μm for polycrystalline boehmite were achieved. The morphological evolution of boehmite was revealed by SEM. The hydrolysis path was determined by analyzing the variation of Al-ion species with pH. Kinetics demonstrated that the hydrolysis process followed heterogeneous nucleation and was chemically controlled, with an apparent activation energy of 52.2 kJ/mol. Finally, a novel process for electrolytic Al 2 O 3 preparation and simultaneous HNO 3 regeneration using coal gangue and fly ash as raw materials was proposed. This study establishes a technological foundation for producing electrolytic alumina from aluminum-containing solid wastes, providing a novel route for large-scale aluminum resource recovery.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 41
·34768-34780
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IF 4.6
Qiwen Zhang,Yong Fan,Yimin Zhang,Peng Liu,Hong Liu,Zihanyu Zhang,Xiuqiong Fu
Molten salt electrolysis is a promising method for producing metallic vanadium, overcoming the limitations of conventional processes, such as high purity requirements for raw materials and high impurity content. This study introduces an innovative approach utilizing soluble vanadium–aluminum alloy anodes in KCl–LiCl molten salt, where vanadium is dissolved as V2+ and V3+. Optimal conditions were identified as 0.3 A cm−2 current density, 500 °C temperature, and 6 h duration. High purity metallic vanadium was prepared under these conditions, and the electrolysis efficiency reached 89.53%. Electrochemical analysis revealed three reduction processes: Al(III) → Al, V(III) → V(II) and V(II) → V. In molten salts, vanadium ions existed in coordination forms as VCl2, VCl3, VCl42−, and VCl63−, while aluminum ions were present as AlCl4−. The process was confirmed as diffusion-controlled, with calculated V(III) diffusion coefficients. Nucleation mechanism analysis demonstrated dual vanadium deposition pathways: instantaneous and progressive nucleation. Fluoride ions were found to enhance reaction kinetics through chloride substitution in aluminum complexes, increasing free chloride availability for vanadium coordination and improving ion mobility. The developed method offers significant advantages in energy efficiency and product quality compared to traditional metallurgical approaches, providing insights for optimization of molten salt electrolysis systems in refractory metal production.
研究领域:
冶金工程
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电化学
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材料科学
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无机化学
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能源材料
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产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 33
·e03600
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IF 2
Jiaqin Wang,Fang Li,Yasi Wang,Wei Huang
Graphical The Al-doped ZnO catalyst has a lower work function, which is conducive to promoting the dissociation of CH x O* to form CH x *; it also facilitates the generation of Zn x+ and oxygen vacancies, which further promotes the generation of C 2+ OH. The direct conversion of syngas into C 2+ OH has attracted significant attention as a potential pathway for energy conversion. However, this process typically requires the use of precious metals or the collaborative action of multi-component catalysts, making it relatively complex. In this paper, simple and economical Al-doped ZnO catalysts were employed for the synthesis of C 2+ OH. The results show that the work function, Zn x+, and the relative content of oxygen vacancies are linearly related to C 2+ OH/ROH. When the doping amount was 7 mol%, the catalyst had the highest C 2+ OH/ROH (82.6 wt%), corresponding to the lowest work function value, the highest Zn x+ content, and the relative content of oxygen vacancies. We reveal that the successful synthesis of C 2+ OH depends not only on the low work function of the Al-doped ZnO but also on the existence of the oxygen vacancies and Zn x+ sites. Specifically, the low work function induced by Al doping facilitates electron transfer in the reaction, facilitating the dissociation of CH x O* into CH x *. Meanwhile, the presence of oxygen vacancies enhances the dissociative adsorption capacity of CO and facilitates the formation of CH x * species. The Zn x+ sites serve as active centers for carbon chain growth, promoting C–C coupling through the insertion of CO or CH x O* into CH x *, thereby achieving chain elongation.
研究领域:
催化化学
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材料科学
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化学工程
·
能量转换
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产品关联
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2025
·
IF 2
Liang Zhang,Chen Zhao,Zuohui Xu,Yuhuai Shi,Erhai An,Jinhu Liang,Xiong Cao
Al is widely used in solid propellants for its high energy density. (C 6 H 14 N 2 )[NH 4 (ClO 4 ) 3 ]（DAP-4）, a novel energetic material, exhibits excellent detonation performance, thermal stability, oxidizing capacity, and cost efficiency, making it a promising high-energy oxidizer. This study investigated the ignition and combustion properties of DAP-4/nano-Al mixtures. DAP-4 was synthesized via a one-pot molecular self-assembly strategy, and mixtures with varying Al ratios (10%–30%) were prepared through mechanical mixing. X-ray diffraction (XRD) confirmed that the mixed powders retained their original crystalline structures without the formation of new phases. Scanning electron microscopy (SEM) revealed that nano-Al particles adhered effectively to DAP-4 surfaces, with higher Al content increasing the particle coverage. Elemental mapping and EDS were used to further characterize the surface morphology changes. Thermogravimetry-Differential Scanning Calorimetry（TG–DSC） indicated good compatibility between DAP-4 and nano-Al, with minimal mutual interference during thermal decomposition. Ignition experiments were conducted in a shock tube under temperatures (2200–3100 K) and pressures (0.1 and 0.5 MPa). The results showed that in the DAP-4/nano-Al mixtures, an increase in the Al fraction caused a decrease in the ignition delay time and an increase in the burn time. Simultaneously, the reaction in the presence of Al changed qualitatively, as is apparent from the changed activation energies. Compared to the combustion of neat DAP-4, both the ignition delay and burn times could be longer or shorter, depending on the Al fraction. This study demonstrated that the addition of nano-Al effectively enhanced DAP-4 combustion. In practice, DAP-4's ignition and combustion can be controlled by adjusting the nano-Al mass fraction.
研究领域:
含能材料
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燃烧科学
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推进剂
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纳米技术
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材料化学
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产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yi Tian,Wenbin Shi,Ping Yang,Xiao Zhang
Carbon dots (CDs) with high photoluminescence quantum yields (PLQYs) are expected to be used in sensors (e.g., metal ions and antibiotics). In this paper, aluminum-doped green-emitting CDs (M-Al-CDs) were prepared by a one-step solvothermal route using m-phenylenediamine. Al doping resulted in sample M-Al-CDs with enhanced green emission with a PLQY of 75.4% and related narrow photoluminescence (PL) spectra with a full width at half-maximum of 57 nm. The PLQYs of CDs increased by 2.3 times after Al doping. This phenomenon is ascribed to Al as a network former that can enter the carbon frameworks of CDs to affect the microstructure and PL. Highly crystalline CDs were created after Al addition, suggesting that the number of surface defects decreased and the radiation recombination efficiency increased. In addition, positive Al ions possess powerful coordination ability with the negative functional groups on the surface of CDs to further decrease nonradiational recombination, in which the Fourier transform infrared spectra of samples confirmed such interaction. Furthermore, these CDs also revealed excellent photo- and thermostability even after being stored at room temperature for 240 days. Sample M-Al-CDs exhibited a static quenching response to Cu2+ ions and oxytetracycline with detection limits of 0.1 and 1.0 μM, respectively. The specific detectability of M-Al-CDs for Cu2+ ions and oxytetracycline is related to the formation of stable complexes between M-Al-CDs and Cu2+ ions as well as to the interaction between Al ions and oxytetracycline. These results indicate an effective approach for the application of CDs as sensors.
研究领域:
材料科学
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分析化学
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纳米技术
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传感器
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环境监测
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
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2026
·
IF 6
Wuxiu Ding,Duo Sun,Lan Zhang,Hongyi Wang,Yang Zhao,Weiguo He,Zhigang Du,Yongyan Yan
Applying protective coatings to the surface of stone heritage is one of the most common methods for its preservation. To enhance the weathering resistance of the limestone heritages, MIL-53@FS, a hydrophobic metal-organic framework (MOF) composite, was prepared through fluorosilane modification of MIL-53-OH synthesized via a solvothermal method. Characterization analyses were conducted using SEM, XRD, TGA, and FTIR techniques. The results indicated that MIL-53@FS maintained its well-ordered framework structure and certain porosity, while forming a continuous and uniform hydrophobic coating, leading to a significant increase of water contact angle to 127.14° and enhanced thermal stability. It exhibited excellent corrosion resistance, anti-icing performance, and color compatibility in the application tests, holding a promising outlook for protecting limestone-based heritages.
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产品关联
DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 22
·3751
·
IF 2.972
Gongjun Cui,Yanping Liu,Guijun Gao,Huiqiang Liu,Sai Li,Ziming Kou
Ti–Al matrix alloy reinforced with a high content of boron was fabricated by using a high-temperature alloying method and powder metallurgy technique (P/M). The preparation method of Ti–Al–B alloying powder was put forward. Phases, microstructure, and mechanical properties of the alloys were investigated. Wear and friction performance were studied by using a ball-on-disc tribotester sliding against a Si3N4ceramic ball from 23 °C (room temperature) to 900 °C. The Ti–Al–B alloy had a higher specific strength than that of the Ti–Al alloy. The boron element obviously enhanced the wear resistance and mechanical properties of the alloys because of the formation of borides (TiB2and AlB2) in matrices and the stable oxide film on the wear tracks. Friction coefficients of alloys were independent of the boron element. The wear mechanisms of the alloys transferred from fatigue wear to oxidative wear with the increase in temperature.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 8
·6036-6044
·
IF 2.22
Wang Shimin,Xiang Mingwu,Lu Yao,Guo Junming,Su Changwei,Bai Hongli,Liu Xiaofang
A series of aluminum and nickel (Al–Ni) co-doped LiAl 0.15 Ni x Mn 1.85− x O 4 composites are prepared through a facile solid-state combustion method. All the as-obtained materials show a spinel structure and analogous spherical morphology with uniform particle distribution. Moreover, the synergistic merits of Al and Ni dual substitutions endow the spinel LiMn 2 O 4 with an elevated Mn average valence state of 3.59 and relatively alleviative Jahn–Teller distortion. Among these samples, the LiAl 0.15 Ni 0.03 Mn 1.82 O 4 (LANMO-0.03) cathode exhibits an optimal electrochemical performance with the discharge capacities of 103.3 mAh g −1 and 102 mAh g −1 at 1 C and 5 C in the first cycle, and the capacity retentions are 72.0% and 68.6% after 1000 cycles, respectively. Even at 1 C and high temperature of 55 °C, an excellent capacity retention remained to be 76.6% after 200 cycles. Furthermore, the LANMO-0.03 has good Li + diffusion capability during charge/discharge, the D Li + value of the LANMO-0.03 (1.65 × 10 –11 cm 2 ∙s −1 ) is higher than that of the LiAl 0.15 Mn 1.85 O 4 (LAMO) (8.12 × 10 –12 cm 2 ∙s −1 ), and the charge transfer resistances of the LAMO and LANMO-0.03 samples are almost the same at 150 Ω before cycling but decrease to 130 Ω and 95 Ω after 1000 cycles at 1 C, respectively. These results demonstrate that the Al–Ni co-doped strategy can enhance the structural stability and provide stable Li + diffusion channel during the long cycles even at elevated temperature. Meanwhile, the facile solid-state combustion approach can also be extended to the preparation of other dual cation-doped electrode materials.
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DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2022
·
IF 4.537
Jianglong Yi,Cheng Chang,Xingchen Yan,Yingchun Xie,Yunzhong Liu,Min Liu,Kesong Zhou
Manufacturing of the 7075 wrought aluminum alloys by selective laser melting technology (SLM) is extremely difficult owing to the inherent low laser absorptivity , poor weldability and cracking. To address these challenges and improve the mechanical properties of the SLM Al 7075 alloy, a novel hierarchical manufacturing method of the selective laser melted Al 7075 alloy from the nanometer scale to the millimeter scale was presented in this study. Nano-WC/Al 7075 sample with fine equiaxed grains was fabricated using SLM. Fewer cracks can be detected within the SLM nano-WC/Al 7075 alloy than the SLM Al 7075 alloy. A large quantity of nano-WC and sintered micro-WC particles were distributed within the equiaxed grains. A well-coherent interface with low lattice mismatch (i.e. 2.03%) is exhibited at the (111) α-Al /(001) WC planes. Al 4 W, Al 2 Cu and MgZn 2 phases nucleated and grew on the surface of the nano-WC particles. A type of fine microstructure composed of the hierarchically reinforced micro/nano particles is produced in the SLM nano-WC/Al 7075 sample, resulting in an excellent micromechanical properties . Notably, wear rate of the SLM nano-WC/Al 7075 sample is about 40.4% lower than that of the SLM Al 7075 specimen, similarly with that of the SLM Ti6Al4V counterpart. These results highlight that the site-specific and quantitative modification of nano-WC particles of Al 7075 powder can be achieved using electrostatic self-assembly. Therefore, introducing nano-WC particles and generating multiple micro/nano reinforcement phases is an effective method to significantly improve their tribological properties.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Wenchao Zhang,Baoqing Yin,Ruiqi Shen,Jiahai Ye,Jason A. Thomas,Yimin Chao
A three-dimensionally ordered macroporous Fe2O3/Al nanothermite membrane has been prepared with a polystyrene spheres template. The nanothermite, with an enhanced interfacial contact between fuel and oxidizer, outputs 2.83 kJ g–1 of energy. This is significantly more than has been reported before. This approach, fully compatible with MEMS technology, provides an efficient way to produce micrometer thick three-dimensionally ordered nanostructured thermite films with overall spatial uniformity. These exciting achievements will greatly facilitate potential for the future development of applications of nanothermites.
研究领域:
材料科学
·
纳米技术
·
含能材料
·
微机电系统（MEMS）
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DOI
高影响因子
危险品化学品经营许可证（带存储）