Oriented Two-Dimensional Covalent Organic Framework Membranes with High Ion Flux and Smart Gating Nanofluidic Transport
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
King Abdullah University of Science and Technology Chemical Engineering 4700 KAUST 23955-6900 Thuwal SAUDI ARABIA
Environmental Science and Engineering
Biological and Environmental Science and Engineering (BESE) Division
Chemical Science Program
Physical Science and Engineering (PSE) Division
Chemical Engineering Program
Embargo End Date2022-11-23
Permanent link to this recordhttp://hdl.handle.net/10754/673771
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AbstractNanofluidic ion transport holds high promise in bio-sensing and energy conversion applications. However, smart nanofluidic devices with high ion flux and modulable ion transport capabilities remain to be realised. Herein, we demonstrate smart nanofluidic devices based on oriented two-dimensional covalent organic framework (2D COF) membranes with vertically aligned nanochannel arrays that achieved a 2–3 orders of magnitude higher ion flux compared with that of conventional single-channel nanofluidic devices. The surface-charge-governed ion conductance is dominant for electrolyte concentration up to 0.01 M. Moreover, owing to the customisable pH-responsivity of imine and phenol hydroxyl groups, the COF-DT membranes attained an actively modulable ion transport with a high pH-gating on/off ratio of ~100. The customisable structure and rich chemistry of COF materials will offer a promising platform for manufacturing nanofluidic devices with modifiable ion/molecular transport features.
CitationCao, L., Liu, X., Shinde, D. B., Chen, C., Chen, I.-C., Li, Z., … Lai, Z. (2021). Oriented Two-Dimensional Covalent Organic Framework Membranes with High Ion Flux and Smart Gating Nanofluidic Transport. Angewandte Chemie. doi:10.1002/ange.202113141
SponsorsThis work was supported by the KAUST Centre Competitive Fund FCC/1/1972-19 and KAUST baseline fund BAS/1/1375-01.