Collaborative Research: Metal-Organic Nanotubes as Tunable Porous Fibers

在材料研究部固态与材料化学项目的支持下，David Jenkins教授（美国田纳西大学）和Nathan Gianneschi教授（美国西北大学）正在研究金属有机纳米管（MONTs），金属有机框架（mof）的一维类似物。金属有机纳米管是纳米尺度上的吸管，由金属和有机成分（配体）之间的化学键构成。改变配体的设计改变了结构内孔隙的大小，这是由Jenkins小组的合成有机化学实现的。改变和调整孔径对于气体分离等应用非常重要。mont要想成为一种能够吸收流体和气体并运输它们的新型纳米材料，关键是要控制它们的结构，并在纳米尺度上理解它们。因此，Gianneschi小组用电子显微镜研究了它们的形成过程。最后，混合配体在一起允许以一种结构上让人想起塑料共聚的方式共聚蒙特。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方式，向大众展示他们对mont的研究成果。技术摘要：在材料研究部固态与材料化学项目的支持下，David Jenkins教授（田纳西大学）和Nathan Gianneschi教授（西北大学）正在研究金属有机纳米管（MONTs），金属有机框架（mof）的一维类似物。由于任何材料的尺寸决定了它的性质、功能和应用范围，mont是一种重要的新型可调多孔材料，是mof的补充。本项目的基本目标是开发一种方法来系统地控制MONTs的孔径、管填料、粒径和组成。孔径是通过有机配体的等孔合成来控制的，这些配体形成2柱MONTs。配体设计也被用来调整非共价相互作用，这导致管填料，在MONT管之间。粒径是通过双相反应混合物如乳剂来控制的。最后，通过混合配体对来控制这些材料的组成，从而产生共聚反应。使用单晶x射线衍射，粉末x射线衍射和固态核磁共振等测量来研究宏观MONTs。利用液相透射电镜等电子显微镜技术研究了MONTs纳米束及其合成过程。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

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.