High-aspect ratio zeolitic imidazolate framework (ZIF) nanoplates for hydrocarbon separation membranes

Ohchan Kwon, Minsu Kim, Eunji Choi, Jun Hyuk Bae, Sungmi Yoo, Jong Chan Won, Yun Ho Kim, Ju Ho Shin, Jong Suk Lee, Dae Woo Kim

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41 Citations (Scopus)


Metal-organic frameworks with high aspect ratios have the potential to yield high-performance gas separation membranes. We demonstrate the scalable synthesis of high-aspect ratio zeolitic imidazolate framework (ZIF)-8 nanoplates via a direct template conversion method in which high aspect ratio-layered Zn hydroxide sheets [Zn5(NO3)2(OH)8] were used as the sacrificial precursor. Successful phase conversion occurs as a result of the collaboration of low template stability and delayed delivery of 2-methylimidazole in weakly interacting solvents, particularly using acetone. When the ZIF-8 nanoplates with an average aspect ratio of 20 were shear aligned in the 6FDA-DAM polymer matrix by bar coating, the separation performance for propylene/propane far surpassed that of the previously reported mixed matrix and polymeric membranes, showing a propylene permeability of 164 Barrer and selectivity of 33.4 at 40 weight % loadings.

Original languageEnglish
Article numberabl6841
JournalScience Advances
Issue number1
Publication statusPublished - 2022 Jan

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