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OmpF concentration and normalized fluorescence (FITC) intensity of feed and permeate streams during layer-by-layer functionalization on PVDF-PAA-PAH membrane. Original PVDF: Nanostone PV200 with pore size of 48 ± 1 nm. FITC labelled OmpF expt: Note the feed concentration for this experiment was 5 μg/ml. Permeate showing very low intensity of FITC Labelled OmpF (red diamond) indicating high retention during each pass.
