Microfluidic Approach toward Continuous and Ultrafast Synthesis of Metal–Organic Framework Crystals and Hetero Structures in Confined Microdroplets

金属有机骨架 微流控 化学 纳米技术 Knoevenagel冷凝 溶剂热合成 水热合成 多孔性 扫描电子显微镜 热液循环 化学工程 催化作用 材料科学 吸附 结晶学 有机化学 复合材料 工程类
作者
Marco Faustini,Jun Kim,Guan‐Young Jeong,Jin Yeong Kim,Hoi Ri Moon,Wha‐Seung Ahn,Dong‐Pyo Kim
出处
期刊:Journal of the American Chemical Society [American Chemical Society]
卷期号:135 (39): 14619-14626 被引量:307
标识
DOI:10.1021/ja4039642
摘要

Herein, we report a novel nanoliter droplet-based microfluidic strategy for continuous and ultrafast synthesis of metal-organic framework (MOF) crystals and MOF heterostructures. Representative MOF structures, such as HKUST-1, MOF-5, IRMOF-3, and UiO-66, were synthesized within a few minutes via solvothermal reactions with substantially faster kinetics in comparison to the conventional batch processes. The approach was successfully extended to the preparation of a demanding Ru3BTC2 structure that requires high-pressure hydrothermal synthesis conditions. Finally, three different types of core-shell MOF composites, i.e., Co3BTC2@Ni3BTC2, MOF-5@diCH3-MOF-5, and Fe3O4@ZIF-8, were synthesized by exploiting a unique two-step integrated microfluidic synthesis scheme in a continuous-flow mode. The synthesized MOF crystals were characterized by X-ray diffraction, scanning electron microscopy, and BET surface area measurements. In comparison with bare MOF-5, MOF-5@diCH3-MOF-5 showed enhanced structural stability in the presence of moisture, and the catalytic performance of Fe3O4@ZIF-8 was examined using Knoevenagel condensation as a probe reaction. The microfluidic strategy allowed continuous fabrication of high-quality MOF crystals and composites exhibiting distinct morphological characteristics in a time-efficient manner and represents a viable alternative to the time-consuming and multistep MOF synthesis processes.
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