In:
Nature Communications, Springer Science and Business Media LLC, Vol. 9, No. 1 ( 2018-02-08)
Kurzfassung:
The great potential of nanoporous membranes for water filtration and chemical separation has been challenged by the trade-off between selectivity and permeability. Here we report on nanoporous polymer membranes with an excellent balance between selectivity and permeability of ions. Our membranes are fabricated by irradiating 2-μm-thick polyethylene terephthalate Lumirror® films with GeV heavy ions followed by ultraviolet exposure. These membranes show a high transport rate of K + ions of up to 14 mol h −1 m −2 and a selectivity of alkali metal ions over heavy metal ions of 〉 500. Combining transport experiments and molecular dynamics simulations with a polymeric nanopore model, we demonstrate that the high permeability is attributable to the presence of nanopores with a radius of ~0.5 nm and a density of up to 5 × 10 10 cm −2 , and the selectivity is ascribed to the interaction between the partially dehydrated ions and the negatively charged nanopore wall.
Materialart:
Online-Ressource
ISSN:
2041-1723
DOI:
10.1038/s41467-018-02941-6
Sprache:
Englisch
Verlag:
Springer Science and Business Media LLC
Publikationsdatum:
2018
ZDB Id:
2553671-0