涂层
燃烧
动力学
表面改性
材料科学
化学工程
活化能
化学动力学
氟化物
表面工程
反应速率
表面能
扩散
点火系统
化学
纳米技术
复合材料
催化作用
物理化学
无机化学
有机化学
热力学
工程类
物理
量子力学
作者
Zijian Li,Xu Zhao,Gang Li,Feiyan Gong,Yu Liu,Qi‐Long Yan,Zhijian Yang,Fude Nie
标识
DOI:10.1016/j.cej.2021.131619
摘要
Surface composition plays a crucial role for the energy output performance of nanosized aluminum (n-Al) based metallic fuels. However, effective surface modification strategy with integrated functions and mild preparation conditions remains being exploited. Herein, a polydopamine fluoride (PF) coating was successfully constructed by covalent decoration of polydopamine (PDA) with thiol-terminated organic fluoride for surface engineering of n-Al under ambient conditions. The uniform coating of PF shell on the n-Al surface enabled the [email protected] composites optimized contact area between reactive components (Al and F). Concomitantly, the generation of fluoride gaseous species from PF coating facilitated the mass transport and self-activation of n-Al particles. It resulted in a substantially enhanced burning rate (196.4 mm s−1), which is 8.1 and 3.6 times than that of pristine n-Al (24.2 mm s−1) and physically mixed samples (54.7 mm s−1), respectively. Additionally, the reaction kinetics could be readily adjusted by tailoring the diffusion distance of reactants, as exhibited by varied heat release (0.24–1.43 kJ g−1), ignition delay (79–427 ms), and pressurization rate (6.3 × 101–2.3 × 103 kPa s−1). On this basis, the surface reaction mechanism was further clarified by combining theoretical simulation and experimental results. The current study provided a general approach for improving combustion performance and modulating reaction kinetics of advanced energy materials by elaborate surface design.
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