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Changes of SEM morphologies of the alginate-based porous film structures formed as a function of PEG-40S (surfactant) and phospholipid concentrations at a constant N2 gas pressure of 0.8 bar and feeding liquid’s flow rate of 100 µL·min−1 (PEG-40S and phospholipid are denoted by PEG and lipid, respectively). Insets show an enlargement of the porous surface at 0.25% and 0.5% PEG samples, respectively.
