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Filtration system characterization: morphology. SEM images of the filter (A-B); distribution of the fiber diameter size (C); distribution of the pore diameter size (D). Overall, filter structure was homogeneous, with fibers ranging from 0.9 to 4.0 μm (C); this structure is obtainable with melt-blow technology. Pore size distribution (D) was extremely heterogeneous with pores ranging from 1 μm to 20 μm of diameter.
