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30 August 2010 Unraveling molecular architecture inside zeolites with second-harmonic generation microscopy
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It is shown how second-harmonic generation microscopy (SHGM) can be used to study the architecture of molecules adsorbed inside zeolites. More specifically, probe molecule para-nitroaniline (PNA) in the two-dimensional pore system of ZSM-5 crystals is visualized. Analysis of the polarization dependency of the second-harmonic allows us to deduce the organization of the molecules inside the pores, which is notably different in the two pore types. Hence, it is possible deduce the internal structure of the zeolite from the organization of the PNA molecules. The SHGM technique is qualitatively compared to two-photon fluorescence microscopy (2PFM) via experimental results.
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M. A. van der Veen, D. E. De Vos, and T. Verbiest "Unraveling molecular architecture inside zeolites with second-harmonic generation microscopy", Proc. SPIE 7758, Physical Chemistry of Interfaces and Nanomaterials IX, 77580D (30 August 2010);

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