Microfluidic reactors for the size-controlled synthesis of ZIF-8 crystals in aqueous phase

摘要

Abstract Zeolitic imidazolate framework (ZIF-8) crystals can be produced effectively via continuous processes using either a single water phase or a biphasic water/alkane flow in a three-dimensional microchannel. ZIF-8 particles were characterized by SEM, TEM, XRD, BET and Raman spectroscopy. The microfluidic technology developed allows the fast synthesis (10min) of ZIF-8 crystals over a wide size range (from ca. 300 to 900nm) simply by varying the experimental parameters (flow rates, temperature, …), while maintaining the high specific surface of this material (ca. 1700m2·g−1) and the sodalite crystalline structure. The microfluidic processes developed operate in water between 25 and 100°C and at atmospheric pressure and are therefore valuable alternatives for the environmentally friendly preparation of ZIF-8 particles. Graphical abstract Display Omitted Highlights • The microfluidic technology allows the production of high quality ZIF-8 crystals. • A single water phase or a biphasic flow can be used. • ZIF-8 particles with sizes ranging from 300 to 900nm can be prepared in 10min. • ZIF-8 particles exhibit a high specific surface (ca. 1700m2·g−1).