OPTIMIZATION OF CRYSTALLIZATION PARAMETERS FOR THE SYNTHESIS OF ZIF-L

Date

2024-1-22

Author

Akkol, Sare Şeyma

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ZIF-L, a type of metal-organic framework (MOF), is a zinc-based crystal that attracts much attention with its two-dimensional structure. Its porous structure, adsorption feature, and leaf-like structure are used in membrane separation and gas adsorption processes. Especially when used as a filling material in mixed matrix membranes (MMMs), its single-crystal structure is thought to be more efficient in terms of increasing the resistance applied to the component expected to be rejected as it should permeate through a more tortuous path along the membrane. This makes the production of two-dimensional single ZIF-L crystals important for use in membrane formulations. In the literature, ZIF-L is generally produced from aqueous solutions in batch crystallisers not only as single crystals but also as polycrystalline material. This study examines the effect of the mixing method on ZIF-L morphology. The results show that, depending on the mixing rate and regime, crystals in the form of single particles, flower-like and double-crystals, can be produced, and the mixing regime can control the crystal morphology. By developing a relation called Mixing Number, the connection between ZIF-L crystal morphology and the mixing regime was examined, and controlled ZIF-L production was studied.

Subject Keywords

Mixed Matrix Membranes (MMMs), Two-Dimensional Crystals, Crystal Morphology, Mixing Regime, ZIF-L

URI

https://hdl.handle.net/11511/108332

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Graduate School of Natural and Applied Sciences, Thesis