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SEM micrographs of cross section of PEI hollow fibers spun with various compositions of bore fluid. (A) HF3-3—H2O, (B) HF3-5—H2O/N-methyl-2-pyrrolidone (NMP) 50/50wt%, (C) HF3-6—H2O/NMP 30/70wt% (PEI concentration—20 wt% and bore fluid flow rate—9 mL/min).
