通过金属有机框架外和核心的协同贡献,工程高性能高高压推进剂
Chao Wang1,2, Cai Li1, Zheng Duan3
1Henan Key Laboratory of Crystalline Molecular Functional Materials, Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.
Small (Weinheim an der Bergstrasse, Germany)
|January 20, 2024
概括
研究人员开发了新型的核心外@金属有机框架 (MOF) 异构结构,用于超高高的固体推进剂. 这些结构使混合火箭发动机的可靠点火和高效燃烧成为可能,提高了性能.
科学领域:
- 材料科学 材料科学 材料科学
- 航空航天工程 航空航天工程
- 化学 化学 化学
背景情况:
- 对混合火箭发动机来说,超高高度至关重要,简化了点火系统.
- 目前通过物理混合将高高球添加剂纳入的方法在可靠的点火和能量释放方面面临挑战.
- 开发先进的固体推进剂是提高火箭发动机效率和安全性的关键.
研究的目的:
- 通过使用核心的异构结构来设计高性能固体超高高推进剂.
- 研究这些新型Al@MOF材料的点火和燃烧特性.
- 与传统混合物相比,增强能量释放和减少点火延迟时间.
主要方法:
- 构建核心的@金属-有机框架 (Al@MOF) 异构结构.
- 评估与液体氧化剂接触时的点火延迟时间和燃烧效率.
- 热反应性研究分析能量释放机制和协同效应.
主要成果:
- Al@MOF异构结构证明了惰性燃料的可靠高高球点火.
- 核心外设计改善了热点生成和热传输,导致更短的点火延迟和比物理混合物更高效的燃烧.
- 超高高的Ag-MOF外和芯之间的协同效应导致了高特异性脉冲 (230-270秒).
结论:
- 核心的Al@MOF异构结构代表了开发先进的固体超高力推进剂的有希望的战略.
- 这种方法克服了物理混合的局限性,提供了增强的点火可靠性和燃烧性能.
- 开发的推进剂显示出在混合火箭发动机应用中显著改进的潜力.
相关概念视频
02:51Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
00:56Extraction: Advanced Methods
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
01:22Heterogeneous Catalysis
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...