Surface slip on rotating graphene membrane enables the temporal selectivity that breaks the permeability-selectivity trade-off.

ABSTRACT: Membrane separation technology is dictated by the permeability-selectivity trade-off rule, because selectivity relies on membrane pore size being smaller than that of hydrated ions. We discovered a previously unknown mechanism that breaks the permeability-selectivity trade-off in using a rotating nanoporous graphene membrane with pores of 2 to 4 nanometers in diameter. The results show that the rotating membrane exhibits almost 100% salt rejection even when the pore size is larger than that of hydrated ions, and the surface slip at the liquid/graphene interface of rotating membrane enables concurrent ultra-selectivity and unprecedented high permeability. A novel concept of "temporal selectivity" is proposed to attribute the unconventional selectivity to the time difference between the ion'

SUBMITTER: Zhang Z 

PROVIDER: S-EPMC7438089 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature