Optimum design for cylindrical-shaped nanoporous filtration membrane

The design of cylindrical-shaped nanoporous filtration membranes is optimized. Across the membrane thickness, two kinds of concentric nanopores respectively with the radii R0 and R1 (R0 ≤ R1) are manufactured. The nanopore with the radius R0 is for filtration, while the nanopore with the radius R1 is for reducing the flow resistance and increasing the flux of the membrane. The optimum R1/R0 value was obtained for yielding the smallest flow resistance of the membrane. This optimum R1/R0 value is dependent on the radius R0, the depth of the filtration pore and the passing liquid-pore wall interaction. For increasing the flux of the membrane, the depth of the filtration pore should be as small as possible.