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Pàgina inicial > Articles > Articles publicats > Post-Synthetic Anisotropic Wet-Chemical Etching of Colloidal Sodalite ZIF Crystals |
Data: | 2015 |
Resum: | Controlling the shape of metal-organic framework (MOF) crystals is important for understanding their crystallization and useful for myriad applications. However, despite the many advances in shaping of inorganic nanoparticles, post-synthetic shape control of MOFs and, in general, molecular crystals remains embryonic. Herein, we report using a simple wet-chemistry process at room temperature to control the anisotropic etching of colloidal ZIF-8 and ZIF-67 crystals. Our work enables uniform reshaping of these porous materials into unprecedented morphologies, including cubic and tetrahedral crystals, and even hollow boxes, by an acid-base reaction and subsequent sequestration of leached metal ions. Etching tests on these ZIFs reveal that etching occurs preferentially in the crystallographic directions richer in metal-ligand bonds; that, along these directions, the etching rate tends to be faster on the crystal surfaces of higher dimensionality; and that the etching can be modulated by adjusting the pH of the etchant solution. |
Ajuts: | Ministerio de Economía y Competitividad MAT2012-30994 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-80 European Commission 615954 Ministerio de Economía y Competitividad SEV-2013-0295 |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | Anisotropic etching ; Hollow particles ; Metal-organic frameworks ; Porosity ; Zeolitic-imidazolate frameworks |
Publicat a: | Angewandte Chemie (International ed. Internet), Vol. 54, Issue 48 (November 2015) , p. 14417-14421, ISSN 1521-3773 |
Postprint 7 p, 706.6 KB |