Wetting of Two-Component Drops : Marangoni Contraction Versus Autophobing

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Zusammenfassung

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

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530 Physik
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Surface tension, Molecules, Liquids, Mixtures, Contact angle
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ISO 690HACK, Michiel A., Wojciech KWIECIŃSKI, Olinka RAMÍREZ-SOTO, Tim SEGERS, Stefan KARPITSCHKA, E. Stefan KOOIJ, Jacco H. SNOEIJER, 2021. Wetting of Two-Component Drops : Marangoni Contraction Versus Autophobing. In: Langmuir. ACS Publications. 2021, 37(12), pp. 3605-3611. ISSN 0743-7463. eISSN 1520-5827. Available under: doi: 10.1021/acs.langmuir.0c03571
BibTex
@article{Hack2021Wetti-67701,
  year={2021},
  doi={10.1021/acs.langmuir.0c03571},
  title={Wetting of Two-Component Drops : Marangoni Contraction Versus Autophobing},
  number={12},
  volume={37},
  issn={0743-7463},
  journal={Langmuir},
  pages={3605--3611},
  author={Hack, Michiel A. and Kwieciński, Wojciech and Ramírez-Soto, Olinka and Segers, Tim and Karpitschka, Stefan and Kooij, E. Stefan and Snoeijer, Jacco H.}
}
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