Supersonic cold spraying for zeolitic metal–organic framework films

Journal article

We describe the first use of high-rate supersonic spray coating to deposit thin films of ZIF-8, a zeolitic metal–organic framework (MOF), adopting a sodalite architecture. This cold-spray technique is versatile and scalable, with tunable processing parameters capable of generating either a textured crystalline film or a randomly oriented polycrystalline coating on both metallic and non-metallic substrates. We provide evidence that guest occupancy by organic solvents (dimethylformamide, dimethylacetamide, and dimethylsulfoxide) in the sodalite cage of ZIF-8 structurally stabilizes the framework against high-velocity impact, resulting in the preferred orientations observed. Moreover, we show that amorphous ZIF-8 films can be straightforwardly obtained at high air pressure exceeding 7 bars in which the particle velocity is ∼500 m/s. It is anticipated that this high-throughput approach can be adapted to fabricate microstructurally compact and strongly adhered ZIF-8 films.

Authors: Kim, D-Y; Joshi, BN; Lee, J-G; Lee, J-H; Lee, JS

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Elsevier
• Journal: Chemical Engineering Journal
• Volume: 292
• Pages: 49–56
• Publication date: 2016-03-10
• Acceptance date: 2016-03-04
• DOI: 10.1016/j.cej.2016.03.029
• ISSN: 1385-8947
• Language: English
• Keywords: metal–organic framework; supersonic spray-coating