HKUST-1 MOF纳米粒子:在超临界CO2中采用一种非经典的结晶路径
Ji Feng1, Almond Lau1, Igor V Novosselov1
1Department of Mechanical Engineering and Institute for Nano-Engineered Systems, University of Washington, Seattle, WA 98195, USA. ivn@uw.edu.
Nanoscale
|November 14, 2024
概括
超临界的CO2辅助合成迅速产生HKUST-1金属有机框架 (MOF) 纳米粒子. 这种连续流的方法可以在几秒钟内产生纯净,稳定的MOF,具有高表面积,从而实现可扩展的MOF生产.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 化学工程是化学工程的重要组成部分.
背景情况:
- 纳米级金属有机框架 (MOF) 提供了增强的性能,如增加表面积和缺陷部位.
- 目前合成MOF纳米粒子 (NP) 的方法在大规模,快速生产方面面临挑战.
- 控制颗粒大小和在MOF NP合成中实现高产仍然是一个重大障碍.
研究的目的:
- 为金属有机框架 (MOF) 纳米粒子 (NP) 开发一种可扩展和快速的合成方法.
- 调查使用超临界CO2在连续流反应堆中用于MOFNP合成.
- 通过这种新的方法合成的MOFNP的特性和生产效率.
主要方法:
- 使用连续流反应堆合成HKUST-1 MOF NP.
- 采用超临界的二氧化碳和乙醇作为辅溶剂,以促进快速核和晶体形成.
- 在温和条件下 (75°C,13MPa) 运行,合成时间短于10秒.
主要成果:
- 实现了纯净和热稳定的HKUST-1 MOFNP,中位尺寸在110-250nm之间.
- 获得的高BET表面积在1610-1890m2g-1.1之间.
- 证明了高的时空产量 (5668 kg m−3 d−1) 和表面积生产率 (1.0 × 1010 m2 m−3 d−1).
结论:
- 超临界CO2辅助连续流合成是快速,大规模的MOF NP生产的有效方法.
- 观察到的非经典晶体生长机制允许调整合成过程.
- 该方法的二氧化碳,溶剂和前体的可回收性支持可持续和可扩展的MOF制造.
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