Nanofluidic Energy Absorption of Metal-Organic Frameworks

金属有机框架的纳流体能量吸收

• 批准号: MR/W012138/1
• 负责人: Yueting Sun
• 金额: $ 138.25万
• 依托单位: University of Birmingham
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=MR%2FW012138%2F1
• 关键词: Nanofluidic; Energy; Absorption; Metal; Organic

Smart materials possessing efficient and controllable energy absorption characteristics are a critical step forward in the engineering of next-generation protection technologies against impact, vibration, and blast. For instance, such materials technology can provide soldiers and police with body armours or bomb suits that offer better protection than ever before. Similarly, it can prevent human body injuries in sports and vehicle crashes, or enhance comfort and reduce maintenance costs used as vibration-proof damping materials. However, in order to design protection systems, engineers currently only have a very limited toolbox based on energy absorption mechanisms developed decades ago, such as plastic deformation of materials, buckling of structures, polymer damping, etc. These mechanisms are useful but have important intrinsic limitations in energy absorption density (i.e. capacity per unit mass), response rate, and most of them cannot be reused or controlled to cope with varying loading conditions. These hinder the delivery of the full potential of energy absorption for the benefit of society. The recent rise of nanoscience has allowed novel approaches to be developed and exciting new performances to be imagined for the first time. The objective of the fellowship is to lay the foundations of a new era in energy absorption and protection systems by leveraging a multidisciplinary approach engaging the nanoscale material chemistry and physics. The underpinning novelty is to exploit a fundamentally new energy absorption phenomenon through the process of mechanically squeezing non-wetting liquid into extremely small spaces in a controllable way. These spaces will be made so small that the liquid, for example, water, must split into water molecules to be able to enter and flow inside, and therefore a substantial amount of mechanical energy can be absorbed during this process. A sponge-like porous material called Metal-Organic Frameworks (MOFs) will be used which provides these kinds of small pores. Their pore size is at the nanoscale, i.e. one-billionth of a metre, comparable to the size of water or other liquid molecules. The idea is ground-breaking as it has the potential to lift the current major limitations of energy absorption systems, e.g. to achieve unprecedented efficiency, reusability, and controllability. One can design the nanoscale liquid intrusion and extrusion behaviours to achieve desired performances such as reusability, or even control their performance in real-time by applying external stimuli: rather than simply being a passive shield, it can provide protection that is customized for different situations and individual's body conditions. The applicant has developed novel experimental techniques to apply and measure sudden shocks onto the system that replicate those experienced in practical impact, which also allows in-situ material characterisation and the application of physical stimuli. With experiments on material systems of different structures and properties, the fellowship aims to fully understand how liquid molecules transport under intensive pressure waves inside MOFs as a flexible and controllable nanoconfinement. It has the potential to revolutionize energy absorption materials and enhance our knowledge of MOF mechanics and nanofluidics. This will in turn benefit many sectors of engineering and society in the long term.

具有高效和可控能量吸收特性的智能材料是下一代冲击、振动和爆炸防护技术工程的关键一步。例如，这种材料技术可以为士兵和警察提供比以往任何时候都更好的保护。同样，它可以防止运动和车辆碰撞中的人体伤害，或作为防振阻尼材料使用，提高舒适性，降低维护成本。然而，为了设计保护系统，工程师们目前只有非常有限的工具箱，这些工具箱基于几十年前开发的能量吸收机制，例如材料的塑性变形、结构的屈曲、聚合物阻尼等。这些机制是有用的，但在能量吸收密度方面具有重要的内在局限性（即每单位质量的容量）、响应速率，并且它们中的大多数不能被重复使用或控制以科普变化的负载条件。这些阻碍了为社会利益提供能量吸收的全部潜力。最近兴起的纳米科学允许开发新的方法，并首次设想令人兴奋的新性能。该奖学金的目标是通过利用多学科方法参与纳米材料化学和物理学，为能量吸收和保护系统的新时代奠定基础。其新奇之处在于，通过以可控方式将非润湿液体机械挤压到极小空间中的过程，利用了一种全新的能量吸收现象。这些空间将被制造得如此之小，使得液体（例如，水）必须分裂成水分子才能够进入并在内部流动，并且因此在该过程期间可以吸收大量的机械能。将使用一种称为金属有机框架（MOF）的海绵状多孔材料，它提供了这些类型的小孔。它们的孔径是纳米级的，即十亿分之一米，相当于水或其他液体分子的大小。这一想法是突破性的，因为它有可能解除目前能量吸收系统的主要限制，例如实现前所未有的效率，可重复使用性和可控性。人们可以设计纳米级的液体侵入和挤出行为，以实现所需的性能，如可重复使用性，甚至通过施加外部刺激来实时控制其性能：而不是简单地作为被动屏蔽，它可以提供针对不同情况和个人身体状况定制的保护。申请人开发了新的实验技术，以将突然冲击施加和测量到系统上，该系统复制了在实际冲击中经历的冲击，这也允许现场材料表征和物理刺激的应用。通过对不同结构和性质的材料系统进行实验，该研究金旨在充分了解液体分子如何在MOFs内部的强烈压力波下传输，作为一种灵活和可控的纳米限制。它有可能彻底改变能量吸收材料，并提高我们对MOF力学和纳米流体的知识。从长远来看，这将反过来使工程和社会的许多部门受益。

项目成果

Mechanical Behaviour of Metal - Organic Framework Materials

金属-有机骨架材料的机械行为

• DOI: 10.1039/9781839166594-00267
• 发表时间: 2023
• 作者: Sun Y

Liquids with High Compressibility.

高压缩性液体。

• DOI: 10.1002/adma.202306521
• 发表时间: 2023
• 期刊: Advanced materials (Deerfield Beach, Fla.)
• 作者: Lai B

Nanofluidic Attenuation of Metal-Organic Frameworks

金属有机框架的纳流体衰减

• DOI: 10.3397/in_2022_0938
• 发表时间: 2023
• 期刊: INTER-NOISE and NOISE-CON Congress and Conference Proceedings
• 作者: Xiao H