Figure 4: Microphotographs (900X) of the alternative emulsions and the samples 1 and 2
Rheology and textural analysis: The rheological profile of the alternative emulsions is presented in Figure 5. All alternatives have a similar behavior compared to Sample 1. In the case of Sample 2, both formulations L2-R3-V1 and K2-R3-V1 have closer values than K1-R3. Using the power fitting in the experimental data (also shown in Figure 5), it is possible to see that the final viscosities η2 , calculated for 5000 s-1, lays between 0.023 and 0.5 Pa·s, for all alternative emulsions. Regarding η1 , only for Formulation L2-R3-V1 and Sample 2 is possible to observe a plateau and see that this value lays between the ideal limits for lotions (120 and 500 Pa·s), which confirms the suitability of the model to predict emulsion viscosity.