Figure 3: White residues of alternative emulsions compared to Samples 1 (left) and 2 (right)
In the case of Sample 2, the formulation L2-R3-V1, which had into account the residues and the two actions regarding the viscosity of the lotion (restrained values for final viscosity and emulsifiers with oleyl groups), had the best results when compared to the similar alternative K2-R3-V1, which only considered the change of the emulsifiers.
Microscopy: Representative optical microphotographs of Sample 1 and 2 and the prototyped emulsions are presented in Figure 4. It was observed that the base case (K0-N1) had a very different microstructure when compared to Sample 1, with droplet sizes around 5 µm. It should be noted that the most similar microstructure to sample 1 is the one of formulation K1-R3. In the case of sample 2, the base case (K1-R3) had a very different microstructure when compared to Sample 2, but the formulation L2-R3-V1 is much more similar.