Collaborative Research: Metal-Organic Nanotubes as Tunable Porous Fibers

在材料研究部固态和材料化学项目的支持下，大卫詹金斯教授（美国）。田纳西州）和内森Gianneschi（西北大学）。正在研究金属有机纳米管（蒙茨），金属有机框架（MOFs）的一维类似物。 金属有机纳米管是由金属和有机组分（配体）之间的化学键构建的纳米尺度的吸管。 改变配体的设计会改变结构内孔的大小，这是通过Jenkins小组的合成有机化学实现的。改变和调整孔径对于诸如气体分离的应用是重要的。 对于蒙茨来说，要实现其作为能够吸取流体和气体并运输它们的新型纳米材料的目标，控制它们的结构并在纳米长度尺度上理解它们至关重要。 因此，Gianneschi小组用电子显微镜研究了它们的形成过程。 最后，将配体混合在一起允许以在结构上使人联想到塑料中的共聚的方式共聚的蒙茨。 将这些配体混合在一起提供了调整这些材料表面的机会。 该项目还包括为学生提供研究机会。此外，教授们还通过YouTube和维基百科等数字化手段展示蒙茨的研究成果，使公众能够了解他们的研究成果。技术摘要在材料研究部固态和材料化学项目的支持下，大卫詹金斯教授（U.田纳西州）和内森Gianneschi（西北大学）。正在研究金属有机纳米管（蒙茨），金属有机框架（MOFs）的一维类似物。 由于任何材料的维度决定了其性质、功能和应用范围，因此蒙茨是一种重要的新型可调多孔材料，与MOF互补。 本计画的主要目的是发展一种方法来系统地控制蒙茨的孔径大小、管填充、颗粒大小及组成。 通过等网格合成形成2-柱撑蒙茨的有机配体来控制孔径。 配体设计还用于调节MONT管之间的非共价相互作用，这导致管填充。 通过双相反应混合物如乳液控制粒度。 最后，通过共混配体对来控制组成，从而产生这些材料的共聚。宏观蒙茨的研究使用测量，如单晶X射线衍射，粉末X射线衍射，和固态NMR。 纳米束的蒙茨和动态过程中的合成与电子显微镜技术，包括液相TEM进行了研究。该奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

Non-technical AbstractWith the support of the Solid State and Materials Chemistry program in the Division of Materials Research, professors David Jenkins (U. Tennessee) and Nathan Gianneschi (Northwestern U.) are studying metal organic nanotubes (MONTs), the 1D analogues of metal organic frameworks (MOFs). Metal organic nanotubes are straws on the nanometer scale that are built from chemical bonds between metals and organic components (ligands). Changing the design of the ligands changes the size of pores within the structures, which is achieved with synthetic organic chemistry from the Jenkins group. Changing and tuning the pore size is important for applications such as gas separations. For MONTs to achieve their goal as new nanomaterials capable of drawing up fluids and gases and transporting them, it is critical to control their structure and understand them at the nanometer length scale. Therefore, the Gianneschi group studies their formation processes with electron microscopy. Finally, mixing ligands together allows for copolymerized MONTs in a manner structurally reminiscent of copolymerization in plastics. Blending these ligands together offers opportunities to tune the surfaces of these materials. The project also encompasses research opportunities for students. Moreover, the professors make their research accessible to the general public by showcasing research on MONTs through digital methods such as YouTube and Wikipedia.Technical AbstractWith the support of the Solid State and Materials Chemistry program in the Division of Materials Research, professors David Jenkins (U. Tennessee) and Nathan Gianneschi (Northwestern U.) are studying metal organic nanotubes (MONTs), the 1D analogues of metal organic frameworks (MOFs). Because the dimensionality of any material dictates its properties, functionality and application scope, MONTs are a critical new tunable porous material that are complementary to MOFs. The fundamental aspiration of this project is to develop a method to control the pore size, tube packing, particle size, and composition of MONTs systematically. The pore size is controlled through isoreticular synthesis of organic ligands that form 2-pillared MONTs. Ligand design is also employed to tune the non-covalent interactions, which leads to tube packing, between the MONT tubes. The particle size is controlled through biphasic reaction mixtures such as emulsions. Finally, the composition is controlled through blending ligand pairs yielding copolymerization of these materials. Macroscopic MONTs are studied using measurements such as single-crystal X-ray diffraction, powder X-ray diffraction, and solid-state NMR. Nano bundles of MONTs and dynamic processes during synthesis are investigated with electron microscopy techniques including liquid phase TEM.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.