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The stability of alkane-in-water nanoemulsions during the sub-stationaryregime is studied by means of Emulsion Stability Simulations (ESS). The effectsof Ostwald ripening, flocculation, coalescence, gravity, and hydration forc- esare considered. According to these calculations flocculation and coalescenceare predominant during the first few seconds after the preparation of theemulsion. This favors the generation of a right-skewed Drop Size Distribu- tion(DSD). As the system evolves, the drops grow larger and more repulsive causinga slow down of the flocculation process. In the case of dodecane (C12) andhexadecane (C16) the referred phenomena, reinforce the ripening trend tosubvert the initial DSD variation, producing a meta-stable distribution whichis preserved during several minutes. After this time, Ostwald ripeningdominates: the skirt of the distribution changes progressively fromright-skewed to left-skewed. Consistent with these changes, the cube averageradius of the emulsion increases rapidly at first, but progressively diminishesgenerating a concave-downward curve that stabilizes asymptotically. In the caseof dodecane and hexadecane the complete dissolution of the drops promoted byripening is prevented at all times due to coalescence. In the case of octane(C8) a substantial amount of drops is lost by dissolution, forbidding theattain- ment of a stable DSD. In all cases the molecular exchange only favors adecrease of the average radius as a function of time. It is the elimination ofdrops either by dissolution or coalescence which causes an increase of theaverage radius of the emulsion.

Short-time Evolution of Alkane-in-Water Nanoemulsions