Ultrathin Two-Dimensional Membranes Assembled by Ionic Covalent Organic Nanosheets with Reduced Apertures for Gas Separation
National University of Singapore · Université Bourgogne Franche-Comté · +1 more institution
Abstract
Covalent organic frameworks (COFs) are a promising category of porous materials possessing extensive chemical tunability, high porosity, ordered arrangements at a molecular level, and considerable chemical stability. Despite these advantages, the application of COFs as membrane materials for gas separation is limited by their relatively large pore apertures (typically >0.5 nm), which exceed the sieving requirements for most gases whose kinetic diameters are less than 0.4 nm. Herein, we report the fabrication of ultrathin two-dimensional (2D) membranes through layer-by-layer (LbL) assembly of two kinds of ionic covalent organic nanosheets (iCONs) with different pore sizes and opposite charges. Because of the…
Citation impact
- FWCI
- 23.78
- Percentile
- 100%
- References
- 64
Authors
8Topics & keywords
- Membrane
- Permeance
- Gas separation
- Covalent bond
- Chemistry
- Porosity
- Chemical engineering
- Permeation