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(a) Measurement of the absorbance of colored solutions as a function of time at 450 nm, demonstrating the water permeability of various PMMA, PMMA/graphene, and COC films. Both the thicker 100 μm COC film, and the two PMMA/graphene films show no significant decrease in signal over the course of more than two weeks. (b) Photographs of the experimental setup showing changes in the liquid levels as seen by a side-view.
