Microscopy image of cross-section structure of the films showed a continuous, compact and homogeneous phase with no irregularities such as air bubbles or pores, in oil-free films (Fig. 3a). Ascompared to control film, the samples with lower amount of oil(0.4% w/v) showed no apparent differences in their microstructura laspect (Fig. 3b). In this film, oil droplets were scarcely observ