Angstrom-Scale Defect-Free Crystalline Membrane for Sieving Small Organic Molecules.

• Tác giả: Cailing Chen, Yu Han, Wanqin Jin, Jiahui Li, Gongping Liu, Guozhen Liu, Binyu Mo, Yaxin Zhang, Guangyuan Zhou
• Ngôn ngữ: eng
• Ký hiệu phân loại: 784.6 +Keyboard, mechanical, electronic, percussion bands
• Thông tin xuất bản: Germany : Advanced materials (Deerfield Beach, Fla.) , 2025
• Bộ sưu tập: NCBI
• ID: 189231

Tóm tắt

 Crystalline membranes, represented by the metal-organic framework (MOF) with well-defined angstrom-sized apertures, have shown great potential for molecular separation. Nevertheless, it remains a challenge to separate small molecules with very similar molecular size differences due to angstrom-scale defects during membrane formation. Herein, a stepwise assembling strategy is reported for constructing MOF membranes with intrinsic angstrom-sized lattice aperture lattice to separate organic azeotropic mixtures separation. The membrane is synthesized by redesigning the metal source, which reduces the coordination reaction rate to avoid cluster-missing defects. Then, extra ligands are introduced to overcome the coordination steric hindrance to heal the linker-missing defects. Ultralow-dose transmission electron microscopy is used to realize a direct observation of the angstrom-scale defects. For separating the challenging methanol-containing ester or ether azeotropic mixtures with molecular size difference as small as <
 1 Å, the angstrom-scale defect-free MOF membrane exhibits an outstanding flux of ≈3700 g·m