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.