CO2-Responsive polymer membranes with gas-tunable pore size

We report a smart polymer membrane whose pore can be switched between the “closed” and “open” state just by passing CO2 and Ar in solution respectively. Compared with other stimuli, such as pH or temperature change, gas is an environmentally friendly and cost-effective stimulus for reversibly tuning the pore size and imparting the size selectivity of the membrane.