The molecular sieve behavior and ultrafast transport mechanism of graphene oxide membranes is predominantly determined by their porous microstructures, including the relaxation of the interlayer nano-confinements, the distribution of functionalized group and interedge spaces. Thus, the selectivity of graphene oxide membrane on a particular molecule is often directly related to the molecule's kinetic diameter. While most of the current experimental and simulation works on graphene oxide membrane focus on the separation of more "spherical" solute such as ions and light molecules, the 2D feature of interlayer galleries formed by pristine graphene sheets has not been fully explored by the literature. Thus, in this study, we examined the transport of organic molecules with similar molecule weight but different 3D orientations through graphene oxide membrane and compared their permeation flux and selectivity.
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