Dynamic Component Exchange in Hybrid Nanomaterials

技术摘要本研究项目由固态与材料化学项目支持，重点研究金属-有机框架（MOF）材料的动态组分交换（DCE）。虽然许多研究表明，一些mof对某些溶剂和试剂（如酸）是“惰性的”，但已经发现，即使在温和的条件下，这些材料也可以进行配体交换反应（即DCE）。这一发现最初是通过利用气溶胶飞行时间质谱（ATOFMS）分析单个MOF微晶体的组成而得到的。这些研究是首次在材料科学（包括纳米材料）中使用ATOFMS，并且是加州大学圣地亚哥分校合成无机化学和分析环境化学之间独特合作的一部分。本研究计划将详细研究DCE，以确定哪些mof容易进行DCE，并了解DCE过程的机制。该计划还将利用DCE作为mof功能化的方法，并确定DCE是否可以同时涉及配体和金属离子交换。最后，该项目将进一步发展ATOFMS方法来量化DCE，并扩大该方法在纳米材料中的分析应用。迄今为止的初步研究结果表明，DCE是一种重要的现象，在mof和其他纳米材料中比以前认识到的更常见。本研究项目的发现将对mof在技术应用中的应用产生重要影响。新材料对许多技术领域的进步至关重要，包括医药、可再生能源、航空航天工程等。这个研究项目正在研究一类新的多孔材料，以及如何为特定的应用量身定制它们。这些新型多孔材料就像高科技“海绵”一样，可以“吸收”其他离子或分子。因此，它们可能在燃料电池、电池和其他重要应用中得到应用。作为更广泛的推广和教育使命的一部分，该提案将支持科学政策实习计划（SPIP），这是一个独特的实习计划，将STEM本科生送到华盛顿特区学习科学与公共政策的接口。

TECHNICAL SUMMARYThe focus of this research program, supported by the Solid State and Materials Chemistry program, is to explore dynamic component exchange (DCE) in metal-organic framework (MOF) materials. While many studies suggest that some MOFs are 'inert' to certain solvents and reagents (e.g. acids), it has been discovered that such materials can undergo ligand exchange reactions (i.e. DCE) even under mild conditions. This discovery was initially made by utilizing aerosol time-of-flight mass spectrometry (ATOFMS) to analyze the composition of individual MOF microcrystals. These studies were the first use of ATOFMS in materials science (including nanomaterials) and are part of a unique collaboration between synthetic inorganic and analytical environmental chemistry at the U.C. San Diego. This research program will study DCE in detail, to identify which MOFs readily undergo DCE and to understand the mechanism of the DCE process. This program will also utilize DCE as a methodology for functionalization of MOFs and to determine whether DCE can involve both ligand and metal ion exchange. Finally, this project will further develop ATOFMS methods to quantify DCE and to broaden the analytical use of this method for nanomaterials. The preliminary findings to date demonstrate that DCE is an important phenomenon that is more common among MOFs and other nanomaterials than previously recognized. The discoveries made in this research program will have important implications for the use of MOFs in technological applications.NON-TECHNICAL SUMMARYNew materials are essential for the advancement of many technological fields including medicine, renewable energy, aerospace engineering, and others. This research program is investigating a new class of porous materials and how they can be tailored for specific applications. These new porous materials act as high-tech 'sponges' that can 'soak up' other ions or molecules. As such, they may find use in fuel cells, batteries, and other important applications. As part of a broader outreach and educational mission, this proposal will support the Science Policy Internship Program (SPIP), a unique internship program, which sends STEM undergraduate students to Washington D.C. to learn about the interface of science and public policy.