| 초록 |
Soon after the discovery of two-dimensional materials, a lot of efforts have been made to fabricate porous crystals like zeolites and metal-organic frameworks in the shape of nanosheet. Especially, zeolite nanosheets are desirable building blocks for catalysts, membranes, low dielectric constant films, and adsorbents. Herein, direct synthesis of MFI nanosheets was achieved by adding graphite in a synthesis solution of multilamellar MFI. While multilamellar MFI particles are composed of orthogonally intergrown-nanosheets by multiple twining, the intergrowth and twining were hindered in the presence of graphite, resulting in the twining-free MFI nanosheet. The thickness of nanosheet was around 20 nm and diameter ranged even up to 10 μm. When the nanosheets were used for mixed-matrix membrane, the membrane showed n-butane permeability of ca. 2800 barrer and n/i-butane ideal selectivity of 21, which is surpassing the upper bound of previous polymer and mixed-matrix membranes. |
