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Visualizing single-molecule diffusion in mesoporous materials

机译：可视化中孔材料中的单分子扩散

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Periodic mesoporous materials formed through the cooperative self-assembly of surfactants and framework building blocks can assume a variety of structures, and their widely tuneable properties make them attractive hosts for numerous applications. Because the molecular movement in the pore system is the most important and defining characteristic of porous materials, it is of interest to learn about this behaviour as a function of local structure. Generally, individual fluorescent dye molecules can be used as molecular beacons with which to explore the structure of—and the dynamics within—these porous hosts, and single-molecule fluorescence techniques provide detailed insights into the dynamics of various processes, ranging from biology to heterogeneous catalysis. However, optical microscopy methods cannot directly image the mesoporous structure of the host system accommodating the diffusing molecules, whereas transmission electron microscopy provides detailed images of the porous structure, but no dynamic information. It has therefore not been possible to 'see' how molecules diffuse in a real nanoscale pore structure. Here we present a combination of electron microscopic mapping and optical single-molecule tracking experiments to reveal how a single luminescent dye molecule travels through linear or strongly curved sections of a mesoporous channel system. In our approach we directly correlate porous structures detected by transmission electron microscopy with the diffusion dynamics of single molecules detected by optical microscopy. This opens up new ways of understanding the interactions of host and guest.
机译：通过表面活性剂和框架结构单元的协同自组装形成的周期性介孔材料可以采用多种结构，其广泛的可调节性使其成为众多应用的有吸引力的宿主。由于孔隙系统中的分子运动是多孔材料最重要且最重要的特征，因此有必要了解这种行为与局部结构的关系。通常，单个荧光染料分子可用作分子信标，可用来探索这些多孔宿主的结构及其内部动力学，单分子荧光技术可提供对从生物学到异质生物学等各种过程动力学的详细了解。催化。然而，光学显微镜方法不能直接对容纳扩散分子的宿主系统的中孔结构成像，而透射电子显微镜可提供多孔结构的详细图像，但没有动态信息。因此，不可能“看到”分子如何在真实的纳米级孔结构中扩散。在这里，我们提出了电子显微镜映射和光学单分子跟踪实验的组合，以揭示单个发光染料分子如何穿过介孔通道系统的线性或强烈弯曲部分。在我们的方法中，我们将透射电子显微镜检测到的多孔结构与光学显微镜检测到的单个分子的扩散动力学直接相关。这开辟了理解主持人和来宾互动的新方法。

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