Microstructural evolution of condensed aggregates during the crystallization of ZSM-5 from a heterogeneous system
| Autor: | Edgar Cardenas, Johanne Mouzon, Cheuk-Wai Tai, Saúl Cabrera, Wilson Aguilar-Mamani, Jonas Hedlund |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Sodium aluminate Energy-dispersive X-ray spectroscopy 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences law.invention Amorphous solid Inorganic Chemistry chemistry.chemical_compound chemistry Nanocrystal Chemical engineering law Phase (matter) 0103 physical sciences Materials Chemistry Crystallization ZSM-5 0210 nano-technology Fumed silica |
| Zdroj: | Journal of Crystal Growth. :126188 |
| ISSN: | 0022-0248 |
| DOI: | 10.1016/j.jcrysgro.2021.126188 |
| Popis: | The microstructural evolution of precursors of ZSM-5 zeolite crystallized from a heterogeneous system using fumed silica, sodium aluminate and tetrapropylammonium ions as reagents is investigated. Entities previously described by Ren et al. (Chem. Mater. 2012, 24, 10, 1726-1737) as condensed aggregates, were extensively studied using scanning electron microscopy, and energy dispersive spectroscopy. It was observed that the condensed aggregates first comprise a core of nanocrystals that is enveloped by a shell of amorphous gel phase. During crystallization, the amorphous shell surrounding the core is converted into ZSM-5 crystals that grow to a film surrounding the core. The crystals in the film grow competitively with nutrients provided by the liquid phase from the surroundings, while the nanocrystals in the core show little or no signs of growth. |
| Databáze: | OpenAIRE |
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