Figure 4 - uploaded by Jean-Pierre Gilson
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Zeolite growth process (A) and its dissolution in fluoride medium (B) revealing the mosaic structure of zeolite crystals. Green inset: right, TEM of 30 min treated ZSM-5-II; left, magnified view of 15 min treated ZSM-5-II with 3D model of a generated mesopore (red).
Contexts in source publication
Context 1
... the early stage of dissolution, twin crystals separate and pseudo mono- crystals are segmented along hitherto hidden defect zones (ZSM-5-II-15; Figure S3b, d). A closer inspection reveals a mosaic of 10 to 20 nm rectangular voids (Figure 2 e) with straight and well-defined edges, in good agreement with N 2 physisorption results ( Figure S4a, b). (Table S1) are retained. ...
Context 2
... regular nano- crystalline domains are not limited to the handful of macro- scopically observable intergrowths. [10,18,19] These nano-sized domains are most probably a direct consequence of the nucleation mechanism in zeolite synthesis (Figure 4). The most accepted mechanism of formation of many zeolites, including the MFI-type, is oriented aggrega- tion. ...
Context 3
... Such imperfect particles, rotated or tilted with respect to growing terraces, can easily lead to the formation of a crystalline domain with a distinct inter- face. [24,25] Thus, crystal dissolution with NH 4 F, reveals the inherent mosaic structure of zeolites, and provides a new and deeper understanding of the nano-scale architecture during zeolite crystallization (Figure 4). ...
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