The fabrication of the polymeric membranes used for the characterization was performed using a solution of PLGA in DMC [25% (w/w)]. A solution drop of 20 μl was delivered in a petri dish (diameter, 100 mm; height, 15 mm) filled with water. Polyethylene terephthalate masks were placed at the bottom of the petri dish and completely submerged in water. These masks were realized as a sort of frame, with the dimension and the shape needed for the slot for the sample’s positioning required by the instrument involved in the process of characterization. Once the solution droplet was dispensed over the water surface, the polymer membrane was formed floating on the water surface, and it was finally picked up using the polyethylene terephthalate (PET) frame. We waited 24 hours at ambient temperature for complete water evaporation, to remove small water droplets eventually present on the membrane. Once the polymer membrane was completely dry, it was placed in the sample’s slot and the external frame was removed to characterize the membrane’s properties.

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