Objective Although a huge number of experimental works may be observed in the literature for microemulsions, modelling reports onthese nano-systems are rare. Additionally, no comprehensive work so far has detailed the changes occurring to a micellar droplet when oilmolecules are introduced (i.e. obtaining microemulsions from micelles). This work aimed to simulate a micelle and a microemulsion systemcontaining polysorbate 80 - as surfactant - and study the structural changes in the two systems.Methods Molecular dynamics simulation employing a coarse-grained model was used.Results The results showed that the oil molecules located in the hydrophobic core of the micelle make its size larger, while the co-surfactantmolecules distribute throughout the system and enter the hydrophilic shell of the micelle.Conclusion It was shown that insertion of oil molecules makes the droplets more spherical, while co-surfactants tend to enlarge them.

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