caa a22 4500 52878661X 20181217030316.0 cr unu---uuuuu 180924e20160108xx s 000 0 eng 10.3929/ethz-b-000111903 doi 10.1038/srep18875 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/111903 On the shedding of impaled droplets: The role of transient intervening layers [Elektronische Daten] [Christos G. Stamatopoulos, Thomas M. Schutzius, Christian J. Köppl, Nicolas El Hayek, Tanmoy Maitra, Jaroslav Hemrle, Dimos Poulikakos] Sci Rep Open access ethresearch Maintaining the non-wetting property of textured hydrophobic surfaces is directly related to the preservation of an intervening fluid layer (gaseous or immiscible liquid) between the droplet and substrate; once displaced, it cannot be recovered spontaneously as the fully penetrated Wenzel wetting state is energetically favorable. Here, we identify pathways for the "lifting” of droplets from the surface texture, enabling a complete Wenzel-to-Cassie-Baxter wetting state transition. This is accomplished by the hemiwicking of a transient (limited lifetime due to evaporation) low surface tension (LST) liquid, which is capable of self-assembling as an intervening underlayer, lifting the droplet from its impaled state and facilitating a skating-like behavior. In the skating phase, a critical substrate tilting angle is identified, up to which underlayer and droplet remain coupled exhibiting a pseudo-Cassie-Baxter state. For greater titling angles, the droplet, driven by inertia, detaches itself from the liquid intervening layer and transitions to a traditional Cassie-Baxter wetting state, thereby accelerating and leaving the underlayer behind. A model is also presented that elucidates the mechanism of mobility recovery. Ultimately, this work provides a better understanding of multiphase mass transfer of immiscible LST liquid-water mixtures with respect to establishing facile methods towards retaining intervening layers. Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 ethresearch Mechanical engineering ethresearch Chemical physics ethresearch Stamatopoulos Christos G. joint author Schutzius Thomas M. joint author Köppl Christian J. joint author El Hayek Nicolas joint author Maitra Tanmoy joint author Hemrle Jaroslav joint author Poulikakos Dimos joint author Scientific Reports London : Nature Publishing Group 6, p. 18875 2045-2322 http://hdl.handle.net/20.500.11850/111903 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/111903 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Stamatopoulos Christos G. joint author ETHRESEARCH 700 1- Schutzius Thomas M. joint author ETHRESEARCH 700 1- Köppl Christian J. joint author ETHRESEARCH 700 1- El Hayek Nicolas joint author ETHRESEARCH 700 1- Maitra Tanmoy joint author ETHRESEARCH 700 1- Hemrle Jaroslav joint author ETHRESEARCH 700 1- Poulikakos Dimos joint author ETHRESEARCH 773 0- Scientific Reports London : Nature Publishing Group 6, p. 18875 2045-2322 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access