In situ static and dynamic light scattering and scanning electron microscopy study on the crystallization of the dense zinc imidazolate framework ZIF-zni
In: PCCP. Physical chemistry chemical physics (Print), Jg. 14 (2012), Heft 2, S. 511-521
Online
academicJournal
- print, 40 ref
Zugriff:
The kinetics and mechanism of crystallization of the dense zinc imidazolate framework with zni topology, from comparatively dilute methanol solutions containing Zn(NO3)·6H2O and imidazole with variation of the zinc-to-imidazole ratio, were followed in situ by time-resolved static and dynamic light scattering. The light scattering data revealed that metastable primary particles of about 100 nm in diameter form rapidly upon mixing the component solutions. After a lag time that is dependent on the imidazole concentration, the primary particles aggregate into secondary particles by a monomer addition mechanism with the primary particles as the monomers. Complementary scanning electron microscopy revealed that further evolution of the secondary particles is a complex process involving polycrystalline intermediates, the non-spherical morphologies of which depend on the initial zinc-to-imidazole ratio. Time and location of the first appearance of crystalline order could so far not be established. The pure-phase ZIF-zni crystals obtained after 240 min are twins. The aspect ratio of the tetragonal crystals can be controlled via the zinc-to-imidazole ratio.
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In situ static and dynamic light scattering and scanning electron microscopy study on the crystallization of the dense zinc imidazolate framework ZIF-zni
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Autor/in / Beteiligte Person: | HIKOV, Todor ; SCHRÖDER, Christian A ; CRAVILLON, Janosch ; WIEBCKE, Michael ; HUBER, Klaus |
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Zeitschrift: | PCCP. Physical chemistry chemical physics (Print), Jg. 14 (2012), Heft 2, S. 511-521 |
Veröffentlichung: | Cambridge: Royal Society of Chemistry, 2012 |
Medientyp: | academicJournal |
Umfang: | print, 40 ref |
ISSN: | 1463-9076 (print) |
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