Wetting of Two-Component Drops: Marangoni Contraction Versus Autophobing

The wetting properties of multicomponent liquids are crucial to numerous industrial applications. mechanisms that determine the contact angles for such remain poorly understood, with many intricacies arising due complex physical phenomena, example, presence surfactants. Here, we consider two-component drops consist mixtures vicinal alkanediols and water. These diols behave surfactant-like in However, on solid substrates surprisingly large. We experimentally reveal angle is determined by two separate completely different nature, namely, Marangoni contraction (hydrodynamic) autophobing (molecular). competition between these effects can even inhibit contraction, highlighting importance molecular structures physico-chemical hydrodynamics.