Engineering High-Performance Hypergolic Propellant by Synergistic Contribution of Metal–Organic Framework Shell and Aluminum Core,Small

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Engineering High-Performance Hypergolic Propellant by Synergistic Contribution of Metal–Organic Framework Shell and Aluminum Core
Small ( IF 13.0 ) Pub Date : 2024-01-20 , DOI: 10.1002/smll.202310970
Chao Wang _{1,

2} , Cai Li ₁ , Zheng Duan ₃ , Zi-Fan Wang ₄ , Qian-You Wang _{1,

2} , Shuang-Quan Zang ₁

Affiliation

Hypergolicity is a highly desired characteristic for hybrid rocket engine-based fuels because it eliminates the need for a separate ignition system. Introducing hypergolic additives into conventional fuels through physical mixing is a feasible approach, but achieving highly reliable hypergolic ignition and energy release remains a major challenge. Here, the construction of core–shell Al@metal organic framework (MOF) heterostructures is reported as high-performance solid hypergolic propellants. Upon contact with the liquid oxidizer the uniformly distributed hypergolic MOF (Ag-MOF) shell can induce the ignition of hypergolic-inert fuel Al, resulting in Al combustion. Such a synthetic strategy is demonstrated to be favorable in hotspot generation and heat transfer relative to a simple physical mixture of Al/Ag-MOF, thus producing shorter ignition delay times and more efficient combustion. Thermal reactivity study indicated that the functionalization of the Ag-MOF shell changes the energy release process of the inner Al, which is accompanied by a thermite reaction. The synergistic effect of implantation of hypergolic MOF and high energy Al contributes to high specific impulses of 230–270 s over a wide range of oxidizer-to-fuel ratios.

中文翻译：

金属有机骨架壳与铝芯协同作用工程高性能自燃推进剂

高燃性是基于混合火箭发动机的燃料非常理想的特性，因为它消除了对单独点火系统的需要。通过物理混合将自燃添加剂引入常规燃料中是一种可行的方法，但实现高度可靠的自燃点火和能量释放仍然是一个重大挑战。在此，核壳Al@金属有机框架（MOF）异质结构的构建被报道为高性能固体自燃推进剂。当与液体氧化剂接触时，均匀分布的自燃 MOF (Ag-MOF) 壳可以引起自燃惰性燃料 Al 的点燃，从而导致 Al 燃烧。事实证明，相对于 Al/Ag-MOF 的简单物理混合物，这种合成策略有利于热点生成和传热，从而产生更短的点火延迟时间和更高效的燃烧。热反应性研究表明，Ag-MOF壳的功能化改变了内部Al的能量释放过程，并伴随着铝热反应。自燃 MOF 和高能 Al 注入的协同效应有助于在各种氧化剂与燃料的比例下产生 230-270 s 的高比冲。

更新日期：2024-01-20

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