COMBUSTION AND FLAME
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2024
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IF 5.8
Xiandie Zhang,Qingqing Zeng,Jie Ji,Haozhe Li,Xinwen Ma,Weiduo Fei,Xiaode Guo,Xiang Zhou
In recent years, metal fluorides are increasingly being investigated as promising oxidants in aluminum-based (Al-based) composite energetic materials to improve the ignition and combustion performance, mainly because of their reaction with the otherwise inert alumina shell. However, the hygroscopicity and relatively high cost of many metal fluorides limit their wide applications. In this work, an effective and mild solvothermal method employing inexpensive raw materials is used to synthesize the otherwise costly anhydrous FeF 2 . A novel Al/FeF 2 energetic composite is then prepared using ultrasound-assisted physical mixing and compared with other more common formulations (Al/PTFE, Al/FeF 3 , Al/Fe 2 O 3 , and Al/FeO) in terms of energetic characteristics. Electric ignition and constant-volume combustion tests show that Al/FeF 2 has a shorter ignition delay time than that of Al/PTFE, as well as a much faster reaction rate and a much greater pressure output capacity than each of Al/FeF 3 , Al/Fe 2 O 3 , and Al/FeO. High-speed photography demonstrates the large flame area and short flame duration of Al/FeF 2 . Moreover, thermal analysis reveals the superior exothermic enthalpy of Al/FeF 2 .Overall, anhydrous FeF 2 prepared in this study shows excellent application potential in Al-based composite energetic materials.
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高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Taotao Cai,Ying Zhang,Shili Zheng,Peiyi Yan,Yi Zhang
Titanium is a highly valued material. Developing a lower-cost titanium (Ti) metal powder production process, potentially substituting the conventional Kroll-HDH method, has challenged the titanium community for decades. The ease of aluminum forming alloys with titanium and the strong chemical affinity of titanium to oxygen rule out the possibility of fabricating pure Ti metal directly by aluminum reduction of TiO 2 . Based on the demonstrated enhanced deoxidation of Ti using Mg metal, this paper proposes an Al–Mg combined stepwise reduction of TiO 2 to fabricate Ti metal powder. Critical challenges overcome in this research include predicting reaction thermodynamics and preparing Ti 2 O intermediate by Al reduction of TiO 2 without significant Al alloying, which is made possible by forming mild-acid soluble Ca 12 Al 14 O 32 Cl 2 byproduct. Various Al reduction conditions were investigated and optimized. To the best of our knowledge, it is the first report to fabricate Ti 2 O powder by Al reduction of TiO 2 with a highly stable chemical composition. The difficulty of sintering the Ti 2 O intermediate before Mg deoxidation to reduce the surface oxygen contribution is mitigated by mixing a certain amount of low-oxygen titanium powder with the Ti 2 O powder. This allows the densification temperature to be lowered from 1400 °C for sintering pure Ti 2 O powder to 1100 °C. Even with as much as around 15 wt% oxygen, the sintered powder can be effectively deoxidized by Mg with the help of hydrogen. A titanium metal powder with an oxygen content of 0.134 wt%, an Al content of 0.123 wt%, and other impurities meeting the standard of pure titanium metal powder (GB/T 34486-2017 FTA1) is successfully prepared by the Al reduction-Mg deoxidation combined process. It is a promising alternative for producing titanium metal powder and its derivatives.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Chong Wan,Yushu Xiong,Honghong Qin,Zhao Qin,Suhang Chen,Kangzhen Xu
Nanothermites are presenting competitive advantage potential in military and civilian applications, but high electrostatic discharge (ESD) sensitivity severely hinders their preparation, storage and usage. Aiming to improve the safety and combustion properties of energetic materials (EMs), the two-dimensional semiconductor materials graphite carbon nitride (g-C 3 N 4 also abbreviated as CN) was inserted into the Al/CuO mixture via the one-step sol-freeze-drying method. The successful preparation of samples was confirmed by morphological and chemical bond characterization. Then DFT calculation and BET tests prove that more active sites exist in reaction interface, and the adsorption between Al atoms and CuO unit cells are easier due to polyvinylpyrrolidone (PVP) and g-C 3 N 4 functioning, thereby improving the combustion of Al/CuO and ESD safety. The Al/CuO/CN nanocomposite with 2.5 wt% CN has an ESD ignition threshold of 3.2 mJ and realizes maximal reaction energy and constant volume heat of combustion ( Q v ) of 1400.4 J·g −1 and 5896 J·g −1 , respectively. As the CN content grows to 10.0 wt%, the ESD ignition threshold keeps decreasing to 8.45 mJ. Additionally, PVP and CN show superior advantages in regulating the combustion of Al/CuO, and the possible effect mechanism is investigated. This work will provide a fresh strategy for extending applications of nanothermites.
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JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2024
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IF 1.9
Yuke Mo,Liping Zhou,Shiqian Fu,Huicheng Yang,Bangchu Lin,Jinjie Zhang,Yongjiang Lou,Yongyong Li
High level of aluminum content in Enteromorpha prolifera posed a growing threat to both its growth and human health. This study focused on exploring the factors, impacts, and process of removing aluminum from Enteromorpha prolifera using humic acid. The results showed that under experimental conditions of 0.0330 g·L−1 humic acid concentration, pH 3.80, 34 °C, and a duration of 40 min, the removal rate was up to 80.18%. The levels of major flavor components, proteins, and amino acids in Enteromorpha prolifera increased significantly after treatment, while polysaccharides and trace elements like calcium and magnesium decreased significantly. Infrared spectroscopy demonstrated that the main functional groups involved in binding with Al3+ during humic acid adsorption were hydroxyl, carboxyl, phenol, and other oxygen-containing groups. The adsorption process of Al3+ by humic acid was a spontaneous phenomenon divided into three key stages: fast adsorption, slow adsorption, and adsorption equilibrium, which resulted from both physical and chemical adsorption effects. This study provided a safe and efficient method in algae metal removal.
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PubMed
高影响因子
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
·
2025
·Vol. 78
·期 4
·1-11
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IF 1.6
Chen Qijie,Liu Chencheng,Han Jiaxin,Cheng Yong,Chen Qingyun,Xiong Zhonggang
A new high-entropy MAX phase (V 0.2 Nb 0.2 Ta 0.2 Mo 0.2 W 0.2 ) 2 AlC was successfully synthesized at 1500 ℃ by nonpressure sintering one-step solid phase reaction method. The microstructure, crystal structure and oxidation behavior of high-entropy (V 0.2 Nb 0.2 Ta 0.2 Mo 0.2 W 0.2 ) 2 AlC MAX phase were investigated. Using thermogravimetry analysis to investigate the oxidative stability of (V 0.2 Nb 0.2 Ta 0.2 Mo 0.2 W 0.2 ) 2 AlC in air environment at high temperature from 0 to 1000 °C, there is no volume change from 0 to 400 °C, and the morphology still exhibits a typical layered structure, demonstrating thermal stability. Oxidation rate gradually decreases with the increase in temperature, and the K p3 value decreases to 0.86 × 10 –4 kg 2 m −4 s 2 at 1000 ℃. The microscopic morphology analysis at different temperatures shows that the surface defects of the matrix gradually form under high-temperature conditions, in which the formation of carbide and Al 2 O 3 layers hinds the further oxidation of the sample. The research provides a reference for the synthesis and thermal stability of new two-dimensional layered high-entropy MAX ceramics.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 10
·6911-6920
·
IF 3.5
Ruixue Bai,Mian Li,Lingyan Feng,Qing Huang
The family of MAX phases and their two-dimensional derivative MXenes attract significant attention due to their unparalleled properties. Synthesis of MAX phases and MXene from biomass sources is important to expand their biology-related applications, while it remains a challenge. The present work explores the possibility to synthesize MAX phases and subsequently derive MXenes by using biomass precursor. Ti 3 AlC 2 MAX phase was synthesized by using glucose as the carbon source in molten salt. The conversion behavior from glucose to Ti 3 AlC 2 was investigated, and the conversion rate of carbon from glucose reached to 70.4% by optimizing the reaction conditions. The as-obtained Ti 3 AlC 2 can be derived into Ti 3 C 2 T x MXene and MXene quantum dots by common chemical treatments, which provides possibility for biomass-derived nanolaminates applying in biological applications such as biological catalysis, bioinstrumentation, and biological tracking.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Si Guo,Chao Deng,Gang Shi,Dawei Wang,Likui Wang
MXenes are emerging as highly promising materials for pseudocapacitive applications, offering exceptionally high specific capacitance. To date, over 30 distinct MXene compositions and nearly 20 solid solutions have been synthesized in the lab. However, research predominantly centers on Ti3C2Tx and a handful of other single-metal MXenes, with scant attention paid to solid-solution MXenes. Herein, a series of solid solution MAX phases (Nb1−yTiy)4AlC3 and corresponding (Nb1−yTiy)4C3Tx MXenes have been synthesized. The maximum proportion of Ti that can be incorporated into the M site has been examined. We found that the rate performance of MXenes improves with increasing Ti content. Especially, (Nb0.7Ti0.3)4C3Tx and (Nb0.6Ti0.4)4C3Tx retain 62.92% and 68.38% of their capacitances, when the scan rate is increased from 5 mV s−1 to 1000 mV s−1, respectively, compared to Nb4C3Tx's 13.88% retention. (Nb0.7Ti0.3)4C3Tx shows a specific capacitance of 311.06 F g−1 under a current density of 1 A g−1 and good cycling stability. This research demonstrates that the electrochemical characteristics of (Nb1−yTiy)4C3Tx solid solution MXenes can be manipulated by adjusting the ratio of transition metals.
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Zhenyun Tian,Weichao Zheng,Liu Yang,ChuanMing Wu,Jialong Kang,Jiawen Chen,Guibao Qiu
The recovery of valuable metals from spent SCR catalysts currently centers on chromium and tungsten oxides. However, this approach demands substantial consumption of acids and bases, and due to the low vanadium and tungsten content, its economic output is minimal. In contrast, titanium dioxide, which exists in significantly higher proportions within the catalyst, is largely overlooked, aggravating environmental issues and leading to considerable resource wastage. This research proposes utilizing spent SCR catalysts as raw materials to directly synthesize titanium alloys, thereby increasing the recovery value of these discarded materials. The findings reveal that aluminum, employed as a reducing agent, efficiently reduces the majority of valuable metals in the catalyst, resulting in the formation of titanium alloys. Furthermore, the addition of calcium oxide markedly enhances the reduction process and improves slag-metal separation. When the CaO content reaches 50 wt%, titanium recovery achieves an impressive rate of 93.34 wt%. The produced alloy comprises primarily a Ti–Al alloy matrix, with a Ti–Si alloy as a dispersed reinforcing phase uniformly distributed within the matrix, demonstrating significant potential for practical applications.
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Particuology
·
2025
·
IF 4.3
Xueqin Liao,Haiou Wang,Peihui Xu,Jianzhong Liu,Jianren Fan
Although aluminum (Al) particles have been widely applied in aerospace and missile technologies, the critical factors influencing their combustion remain insufficiently studied. To address this, this work investigates the effects of multiple factors on Al particle combustion through thermodynamic theoretical calculations and experimental approaches. Thermodynamic results indicate that various oxidizing gases can chemically react with Al and release heat. Among them, the reaction between Al and oxygen exhibits the largest enthalpy change and Gibbs free energy change. In both Al/O and Al/O/C/H systems, increasing temperature reduces enthalpy change but enhances Gibbs free energy change. Pressure shows negligible effects on the system, while the influence of Al molar quantity depends on oxygen atom availability. Thermal analysis reveals that smaller particle sizes significantly increase oxidation rates. Moreover, Al particles with different particle sizes can continue to react until complete oxidation at a constant temperature of 1400 °C in air, suggesting that the alumina shell at high temperatures may be loose and porous with a non-dense structure. Combustion tests demonstrate that reducing particle size from 25 μm to 0.1 μm decreases ignition delay time by 86% and increases combustion temperature by 30%. Similarly, elevating oxygen concentration or pressure reduces ignition delay, enhances combustion temperature, and improves combustion efficiency. This study provides fundamental data support for constructing Al particle combustion models under complex variable environments.
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JOURNAL OF FOOD BIOCHEMISTRY
·
2025
·Vol. 2025
·期 1
·8616106
·
IF 4.2
Chen Chen,Zengrong Ye,Jianan Li,Na Liu,Bo Wang,Guoying Zhou
Rheum tanguticum petiole juice, widely consumed in Tibet as both a vegetable and an herb, exhibits varying chemical compositions depending on the production methods. This study aims to identify the bioactive components in raw juice using ultra-performance liquid chromatography–quadrupole time-of-flight tandem mass spectrometry (UPLC–QTOF–MS–MS) and analyze their antidiabetic properties through network pharmacology. In addition, the effects of the three types of membrane clarification were evaluated. A total of 36 compounds were identified, and a components–targets–pathways–disease network was constructed for diabetes treatment. Among the membranes tested, the 0.2 μm microfiltration membrane exhibited the highest permeate flux and retained significant amounts of total flavonoids, phenolics, and proanthocyanidins, making it the optimal choice for juice clarification. These findings lay the groundwork for the industrial processing and utilization of R . tanguticum petiole juice in China.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Liang Yuan,Wang Kai,Liu Simeng,Shi Jian,Liu Fan,Morikawa Hideaki,Zhu Chunhong
Toluene (C 7 H 8 ) is a representative volatile organic compound (VOC) that poses a significant threat to the atmospheric environment and human health. Catalytic oxidation has shown demonstrated advantages in the field of air purification, but precious metal catalysts have significant limitations by their high cost and scarcity. This study used hydrothermal synthesis to prepare manganese dioxide nanowires with a diameter of approximately 100 nm. A multi-scale fiber membrane was constructed with mullite nanofibers, which can effectively remove PM 2.5 and toluene from the air. The filtration efficiency of the composite fiber membrane remaind above 99% at different air flow rates. It can achieve complete oxidation of toluene, and after five cycles of testing, the removal rate of toluene remains at 99.2%, demonstrating good catalytic performance. MnO 2 nanowire/mullite multi-scale fiber membrane has shown great potential for indoor air purifier filters.
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高影响因子
THERMOCHIMICA ACTA
·
2025
·
IF 3.5
Wenke Zhang,Jianzhong Liu,Haiou Wang,Xueqin Liao,Jianren Fan
Aluminum (Al) combustion in CO 2 was investigated to assess carbon sequestration potential. Theoretical and experimental results identified C(s), Al 4 C 3 (s), and CO(g) as primary products, with C(s) formation being most thermodynamically favorable. Al oxidation in CO 2 proceeded through three stages, with the second stage (activation energy: 260–268 kJ·mol⁻¹) exhibiting the highest reactivity. Kinetic analysis indicated an Anti-Jander/D1 mechanism for this dominant stage. Reducing particle size from 25 μm to 0.1 μm at 0.1 MPa shortened ignition delay by 664 ms and increased combustion temperature by 847 K. Characterization confirmed carbon incorporation in products (Al 2 O 3 /Al 4 C 3 ) and demonstrated enhanced combustion efficiency and carbon fixation with smaller particles or higher pressures. These findings provide critical insights for Martian in-situ resource utilization and carbon capture technologies.
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高影响因子
危险品化学品经营许可证（带存储）