Diatom-Mimicking Ultrahigh-Flux Mesoporous Silica Thin Membrane with Straight-Through Channels for Selective Protein and Nanoparticle Separations

Jingling Yang, Geng Sheng Lin, Chung Yuan Mou, Kuo Lun Tung

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

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¥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.

Original languageEnglish
Pages (from-to)1745-1751
Number of pages7
JournalChemistry of Materials
Volume31
Issue number5
DOIs
Publication statusPublished - Mar 12 2019
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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