Defence Technology
·
2025
·
IF 5.9
Wei Huang,Yaofeng Mao,Sijia Yu,Longjie Huang,Jie Chen,Cui Nie,Xingquan Zhang,Fude Nie,Jun Wang
The energy release of energetic composites is severely limited by the inert alumina (Al 2 O 3 ) layer on the surface of aluminum (Al). Polytetrafluoroethylene (PTFE) could eliminate Al 2 O 3 layer due to its highly electronegativity and oxidability of fluorine. However, adding PTFE particles would weaken interfacial interactions resulted in poor mechanical properties and interfacial exothermic reaction. Herein, a bridging Al-PTFE as fuel and interfacial reinforcing agent was added and used to prepare LLM-105/Al-PTFE microspheres, achieving both high energy output and excellent mechanical properties. The energy release and combustion reaction performance of LLM-105/Al-PTFE microspheres are significantly improved due to high reaction heat and increased interfacial reaction area of Al-PTFE. The maximum pressure and pressurization rate of LLM-105/Al-PTFE microspheres are 164.06 kPa and 29.88 kPa/s, respectively, which are 40.11% and 16.67% higher than those of physical mixed samples. Furthermore, the tensile strength and compressive strength of LLM-105/Al-PTFE microspheres are 100.40% and 26.47% higher than those of LLM-105/Al. This work provides a new approach to improve the energy release and mechanical properties for energetic composite.
研究领域:
材料科学
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化学工程
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含能材料
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复合材料
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 15
·22560-22575
·
IF 0
Kong Yanli,Guo Meng,Lu Fan,Huang Aihua,Nie Yong,Ma Jiangya
Conventional inorganic coagulants (Al, Fe) and Al/Fe-based covalently bonded flocculants (CAFMs) had different hydrolysis species at different pHs, which subsequently led to differences in their binding sites and complexation ability with humic acid (HA). Studying the binding sites and interactions between CAFMs, AlCl 3 (Al), and FeCl 3 (Fe) hydrolysates and HA molecules is critical to understanding the coagulation mechanism. The results found that CAFM 0.6 , Al, and AlCl 3 combined FeCl 3 (Al/Fe) removed more than 90% of HA at pH 6, and CAFMs showed higher HA removal rate than that of Al, Fe, and Al/Fe under the same reaction conditions. The flocs of CAFMs contained abundant -NH 2 /OH as well as the large particle size, compact structure, and excellent settling performance. The hydrolyzed species of Al and Fe were predominantly Al b and Fe b at pH 6, but the hydrolyzed species of CAFMs were primarily (Al + Fe) c . Moreover, the hydrolyzed species of Al and Al/Fe were found to complex with HA functional groups such as -COOH, C = O, C-H/C–C, C = C, and C–OH to form ligand bonds, while the hydrolyzed species (Al + Fe) c of CAFMs could deeply interact with HA functional groups including C-O, -COOH, C = O, C-H/C–C, C = C, and C–OH by the adsorption and sweeping.
研究领域:
环境科学
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水处理技术
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胶体化学
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无机化学
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高分子科学
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分析化学
✓ 已验证
DOI
FUEL
·
2023
·
IF 7.4
Linjie Guan,Meiyu Liu,Honghai Liu,Li Zhang,Yiming Zhang,Yucai Qin,Binbin He,Yi Mei,Yun Zu
The regulation of the engineering regionally spatial framework aluminum (Al F ) distribution in MFI channels has been considered as an effective way for the production of light olefins by targeted fluid catalytic cracking (TCO) technology. In this work, ZSM-5 zeolites with controlled Al F distributions are facilely synthesized by tuning the combinations of pentaerythritol (PET), tetrapropylammonium (TPA) and Na cations. The Al F atoms in the prepared HZ5-[PET + Na] and HZ5-[TPA] samples are enriched in the straight channels and intersection channels, respectively, which are favorable to the n-butane monomolecular reaction pathway, promoting the propylene production. Whereas the Al F atoms in the HZ5-[TPA + Na] sample are simultaneously distributed in both the straight and intersection channels, the n-butane molecules preferentially take place monomolecular reaction in the straight channels to generate carbonium ions (e.g., C 2 H 5 + , C 3 H 7 + and C 4 H 9 + ). Subsequently, all of them enter into the intersection channels to induce the occurrence of bimolecular reaction. Such a process is conducive to the formation of ethylene. These insights can help to clarify the catalytic behavior of regional framework acid sites in ZSM-5 channels and then provide an effective approach to design efficient TCO catalysts.
研究领域:
化学工程
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催化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·Vol. 26
·期 30
·20273-20279
·
IF 2.9
Hao Huang,Chaohui Wei,Qiang Zhao,Aijun Zhou,Jingze Li
An in situ polymerization strategy is regarded as a promising approach to fabricate gel polymer electrolytes (GPEs) and improve interface contact between the electrolyte and electrodes, in which the initiator is initially dissolved in the precursor solution. Herein, aluminum trifluoromethanesulfonate (Al(OTf)3) is preloaded onto a separator sheet as the initiator to trigger the ring-opening reaction of 1,3-dioxolane (DOL). The polymer matrix near the separator has a higher crystallization degree than that far away from the separator. Fluoroethyl carbonate (FEC) is further introduced as a liquid plasticizer to produce an amorphous GPE for enhanced ionic conductivity and interfacial stability. As a result, the as-synthesized FEC based GPE exhibits a substantial ionic conductivity of 1.5 × 10−4 S cm−1 at room temperature, an expanded electrochemical window of 4.8 V, and a high Li+ transference number of 0.63. The symmetric Li|Li cell exhibits a stable lifespan for 650 h at 1 mA cm−2 and 1 mA h cm−2. Moreover, the LiFePO4 full cell exhibits stable cycling for 300 cycles at 1C with a capacity retention of 94.5%. This work provides a novel idea for the in situ synthesis of advanced GPEs toward practical application of solid-state lithium metal batteries.
研究领域:
材料科学
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电化学
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储能技术
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高分子化学
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固态电池
✓ 已验证
DOI
高影响因子
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