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The dynamics of thin volatile droplets comprising of binary mixturesdeposited on a heated substrate are investigated. Using lubrication theory, wedevelop a novel one-sided model to predict the spreading and retraction of anevaporating sessile axisymmetric droplet formed of a volatile binary mixture ona substrate with high wettability. A thin droplet with a moving contact line isconsidered, taking into account the variation of liquid properties withconcentration as well as the effects of inertia. The parameter space isexplored and the resultant effects on wetting and evaporation are evaluated.Increasing solutal Marangoni stress enhances spreading rates in all cases,approaching those of superspreading liquids. To validate our model, experimentsare conducted with binary ethanol-water droplets spreading on hydrophilic glassslides heated from below. The spreading rate is quantified, revealing thatpreferential evaporation of the more volatile component (ethanol) at thecontact line drives superspreading, leading in some cases to a contact lineinstability. Good qualitative agreement is found between our model andexperiments, with quantitative agreement being achieved in terms of spreadingrate.

Spreading and retraction dynamics of sessileevaporating droplets comprising volatile binary mixtures