Protecting metal-organic framework crystals from hydrolytic degradation by spray-dry encapsulating them into polystyrene microspheres
Carné-Sánchez, Arnau (Institut Català de Nanociència i Nanotecnologia)
Stylianou, Kyriakos C. (Institut Català de Nanociència i Nanotecnologia)
Carbonell Fernández, Carlos (Institut Català de Nanociència i Nanotecnologia)
Naderi, Majid (Surface Measurement Systems)
Imaz, Inhar (Institut Català de Nanociència i Nanotecnologia)
Maspoch Comamala, Daniel (Institut Català de Nanociència i Nanotecnologia)

Data:	2015
Resum:	A one-step, alternative, rapid, and scalable spray-drying (SD) synthesis of metal-organic frameworks (MOF)@polymer composites with enhanced hydrolytic stabilities was reported. SD was used to encapsulate preformed MOF crystals in a polymeric matrix to generate microscale MOF@polymer spheres. For proof-of-concept Hong-Kong University of Science and Technology-1 (HKUST-1) was chosen as the water-sensitive MOF, and polystyrene (PS) as the organic polymer. The synthesis of HKUST-1@PS began with preparation of a stable colloidal suspension of HKUST-1 crystals and a solution of PS in dichloromethane (DCM). This mixture was atomized using a two-fluid nozzle. After 40 min of continuous spraying, 1. 7 g of a blue powder was recovered. The sample was then washed with ethanol and dried at 120°C under vacuum. This product was analyzed through field-emission scanning electron microscopy (FESEM), which indicated that it comprised smooth microspheres of HKUST-1@PS composites and did not contain any free HKUST-1. X-ray powder diffraction (XRPD) analysis of these spheres revealed a perfect match with the HKUST-1 pattern. The exclusive presence of microspheres and the match in XRPD patterns evidenced that HKUST-1 crystals were indeed entrapped within the polymeric matrix of PS.
Ajuts:	Ministerio de Economía y Competitividad CTQ2011-16009-E European Commission 61594 Ministerio de Economía y Competitividad MAT2012-30994
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Colloidal suspensions ; Hydrolytic degradation ; Hydrolytic stability ; Metal organic framework ; Polymeric matrices ; Polystyrene micro-sphere
Publicat a:	Advanced materials, Vol. 27, Issue 5 (February 2015) , p. 869-873, ISSN 1521-4095

DOI: 10.1002/adma.201403827
PMID: 25492381

Postprint 13 p, 3.0 MB

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