# Are there materials permeable to oxygen and carbon dioxide but not nitrogen?

Are there materials permeable to $$\ce{O2}$$ and $$\ce{CO2}$$ but not $$\ce{N2}$$?

Would this even be possible in theory? Can it be done at even at pressures of 300 atm?

• Permeable is not a 0/1 quality. For three unpolar small gas molecules, the difference in permeability for each will never be very much different, but certainly it will be different. – Karl May 20 '19 at 6:19