Smart covalent organic networks (CONs) with “on-off-on” light-switchable pores for molecular separation
Nunes, Suzana Pereira
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Environmental Science and Engineering Program
Imaging and Characterization Core Lab
Nanostructured Polymeric Membrane Lab
KAUST Grant NumberURF/1/3441-01-01
Online Publication Date2020-08-19
Print Publication Date2020-08
Permanent link to this recordhttp://hdl.handle.net/10754/664744
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AbstractDevelopment of the new-generation membranes for tunable molecular separation requires materials with abilities beyond strict separation. Stimuli response could remotely adjust the membrane selectivity. Azobenzene derivatives can be photo-switched between trans and cis isomers under ultraviolet or visible light. Here, the azobenzenes were implanted as light switches to bridge the flexible cyclen building blocks. The smart covalent organic network membranes fold and unfold as origami that can be photo-switched between on-state (large) and off-state (small) pores. The cis membranes with off state under ultraviolet (UV) light have higher dye rejection than trans membranes with on-state channels. By controlling the trans-to-cis azobenzene isomerization via UV/Vis light, the pore size can be remotely controlled at the molecular level and the solvent permeance and dye rejection can be dynamically tuned.
CitationLiu, J., Wang, S., Huang, T., Manchanda, P., Abou-Hamad, E., & Nunes, S. P. (2020). Smart covalent organic networks (CONs) with “on-off-on” light-switchable pores for molecular separation. Science Advances, 6(34), eabb3188. doi:10.1126/sciadv.abb3188
SponsorsWe thank L. Upadhyaya, D. Mahalingam, and B. Pulido for valuable assistance and fruitful discussion in the research process. The schematic illustration in Fig. 1 was produced by X. Pita, scientific illustrator at King Abdullah University of Science and Technology (KAUST)
We thank King Abdullah University of Science and Technology for the financial support, particularly CRG grant URF/1/3441-01-01.
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