Zeolites, as representative porous materials, possess intricate
three-dimensional frameworks that endow them with high surface areas and
remarkable catalytic properties. There are a few factors that give a huge
influence on the catalytic properties, including the size and connectivity of
these three-dimensional channels and atomic level defects. In additional to
that, the surface morphology and thickness variation of zeolites particles are
essential to their catalytic performances as well. Cependant, it is a significant
challenge to characterize these macroscopic properties of zeolites using
conventional techniques due to their sensitivity to electron beams. In this
study, we introduce surface-adaptive electron ptychography, an advanced
approach based on multi-slice electron ptychography, which enables
high-precision reconstruction of both local atomic configurations and global
structural features in zeolite nanoparticles. By adaptively optimizing probe
defocus and slice thickness during the reconstruction process, SAEP
successfully resolves surface morphology, thickness variations and atomic
structure simultaneously. This integrated framework facilitates a direct and
intuitive correlation between zeolite channel structures and particle
thickness. Our findings open new pathways for large-scale, comprehensive
structure property analysis of beam-sensitive porous materials, deepening the
understanding of their catalytic behavior.

Cet article explore les excursions dans le temps et leurs implications.

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