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- W4309482924 abstract "• Amorphous phase mediated zeolite imidazolate frameworks-8 crystallization. • The importance of amorphous phase composition and structure in phase transformation. • The tunable dissolution and recrystallization kinetics for morphology control. Understanding the composition and structure of amorphous precursor phases is fundamental for elucidating two-step crystallization mechanisms and designing shape- and size-controlled nanomaterials. However, that understanding is largely lacking for metal-organic framework compounds despite their growing significance as functional materials. Here, we report the crystallization of zeolite imidazolate frameworks-8 (ZIF-8, Zn(C 4 H 5 N 2 ) 2 ) via an amorphous ZIF (am-ZIF) solid precursor phase with a rough stoichiometric composition of Zn(C 4 H 5 N 2 ) 1.78 (C 4 H 6 N 2 ) 0.17 (CH 3 COO) 0.22 . The formation of am-ZIF is attributed to the incomplete deprotonation of 2-Methylimidazole (HmIm) and the involvement of the hydrogen bond between CH 3 COO- and –HN, which can further transform into the dense Dia(Zn) structure with a diamondoid crystal topology in pure water. Taking am-ZIF as a precursor, the tunable dissolution and recrystallization kinetics of am-ZIF into ZIF-8, due to the addition of EtOH and CTAB, allows the selective fabrication of dodecahedral, cubic, and hollow ZIF-8. Overall, an in-depth understanding of the differences in composition and structure of am-ZIF from ZIF-8 and the resulting crystallization kinetics suggests a novel approach to designing metal-organic frameworks with controlled crystal morphology." @default.
- W4309482924 created "2022-11-28" @default.
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- W4309482924 date "2023-02-01" @default.
- W4309482924 modified "2023-09-28" @default.
- W4309482924 title "The role of amorphous ZIF in ZIF-8 crystallization kinetics and morphology" @default.
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- W4309482924 doi "https://doi.org/10.1016/j.jcrysgro.2022.126989" @default.
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