지르코늄 금속 유기 골격체 UiO-66 필름의 항균 보호막 및 기체 분리막으로의 응용

Abstract

In this contribution, a strong antibacterial activity against Escherichia coli and Staphylococcus epidermidis of metal-organic framework UiO-66 (Universitetet i Oslo-66) film is reported. Despite its potential as an antibacterial material, UiO-66 suffered from intrinsic formation of missing linker defects, which make it hydrophilic. The antibacterial resistance was developed by endowing hydrophobicity to UiO-66 via controlling defects: the less defective, the more hydrophobic. Defects were controlled by introducing competing monodentate ligands (e.g., acetic acid) or defect-capping agents (e.g., dopamine) during synthesis. The monodentate ligand increased hydrophilicity by increasing defects via a competitive reaction with bidentate ligand. The defect capping agent increased hydrophobicity by capping the defects via bonding nitrogen to the defective zirconium site. Polycrystalline UiO-66 film, which was obtained with the defect-capping agent showed superhydrophobicity (Water contact angle: ca. 162°), significantly inhibiting bacterial attachment (≤1 (Zero) CFU/mL).|In this study, we demonstrate that Polydimethylsiloxane(PDMS) coating is effective to plug intercrystalline defects, leading to noticeable enhancement in polycrystalline MOF(Metal-organic framework) membrane separation performance. Polycrystalline MOF membranes suffered from intrinsic formation of intercrystalline defects, which caused by grain boundary. Minimizing non-selective intercrystalline defects of polycrystalline MOF membranes are essential to realize high quality polycrystalline membrane performance. Polycrystalline UiO-66 (Universitetet i Oslo-66) membrane was produced through optimization of synthesis conditions such as synthesis temperature and support to prove the suggested concept. UiO-66 membrane, which was obtained after PDMS coating showed increase ideal CO2/N2 selectivity from 6 to 14, and decrease CO2 permeance from 5700 GPU to 33 GPU.