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    Real-Space Imaging of the Ordered Small Molecule Orientations in Porous Frameworks by Electron Microscopy

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    Type
    Preprint
    Authors
    Shen, Boyuan
    Chen, Xiao
    Cai, Dali
    Xiong, Hao
    Jin, Shifeng
    Liu, Xin
    Han, Yu cc
    Wei, Fei
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Chemical Science Program
    KAUST Catalysis Center (KCC)
    Nanostructured Functional Materials (NFM) laboratory
    Physical Science and Engineering (PSE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2020-01-27
    Permanent link to this record
    http://hdl.handle.net/10754/661685
    
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    Abstract
    The real-space imaging of small molecules is always challenging under the electron microscopes, but highly demanded for investigating various nanoscale interactions, such as hydrogen bond and van der Waals (vdW) force. Especially, identifying the host-guest interactions in porous materials directly at the molecular level will bring a deeper insight into the behaviors of guest molecules during the sorption, catalysis, gas separation and energy storage. In this work, we directly resolved the ordered configurations of p-xylenes (PXs) adsorbed in ZSM-5 frameworks by the scanning transmission electron microscopy (STEM) with the integrated differential phase contrast (iDPC) technique to identify the host-guest vdW interactions. Based on these observations, we revealed that the PXs in one straight channel modified the channel geometry with a coherent orientation. And the adjacent straight channels were deformed up to 8.8% along the different directions corresponding to three dominant PX configurations, resulting a negligible overall expansion of ZSM-5 lattices. Then, we could also image the disorder and desorption of PXs in ZSM-5 channels during the in situ heating. This work not only helped us to study the host-guest vdW interactions and the sorption behaviors of PXs in ZSM-5, but also provided an efficient tool for further imaging and studying other single-molecule behaviors under STEMs.
    Publisher
    arXiv
    arXiv
    2001.09588
    Additional Links
    https://arxiv.org/pdf/2001.09588
    Collections
    Preprints; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC); Water Desalination and Reuse Research Center (WDRC)

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