期刊
CHEMISTRY OF MATERIALS
卷 31, 期 5, 页码 1745-1751出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b05295
关键词
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资金
- National Taiwan University, the Ministry of Science and Technology, Taiwan [104-2221-E-002-176-MY3, 107-3017-F-002-001]
- Advanced Research Center of Green Materials Science and Technology from The Featured Area Research Center Program by the Ministry of Education [107L9006]
- Ministry of Science and Technology (MOST)
A nature-inspired mesoporous ultrafiltration membrane with unprecedented permeability and high selectivity for selective protein and nanoparticle separations is reported herein. We describe a diatom-mimicking hierarchically porous membrane that consists of a single-layer mesoporous silica thin film (MSTF) with perpendicular pores supported on top of a macroporous anodic aluminum oxide (AAO) membrane (MSTF perpendicular to AAO) for ultrafiltration. The MSTF, with a thickness of ca. 30 nm, uniform vertical straight-through mesoporous channels (pore diameter of 5.9 +/- 0.4 nm), superhydrophilicity, and continuous nonbreaking to centimeter range (area of 17.3 cm(2)), is overlaid on the AAO straight-through membrane, which counterintuitively exhibits both ultrahigh water permeability (1027 +/- 20 L m(-2) h(-1) bar(-1)) and an excellent rejection rate (>99%) for molecules larger than 7 nm. The water permeability result is significantly higher than that of the reported nanosized channeled membranes. A model equation for calculating the theoretical permeability flux of the vertically nanochanneled membrane is established and compared with experimental results.
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