Event
When honey moves faster than water| Title of the event | When honey moves faster than water |
| Series | Seminar über aktuelle Fragen zur Dynamik komplexer Fluide |
| Organizer | Dynamik komplexer Fluide |
| Speaker | Matilda Backholm |
| Speaker institution | Aalto University, Helsinki, Finland |
| Type of event | Seminar |
| Category | Forschung |
| Registration required | Nein |
| Details | The viscosity of a fluid is well known to limit its flow: the more viscous a droplet, the slower it moves [1,2]. Here, we show that this intuitive rule breaks down in a confined liquid-repellent geometry. A gravity-driven, highly viscous glycerol droplet placed in a sealed superhydrophobic capillary moves more than 10 times faster than a low-viscosity water droplet [3]. This anomalous, viscosity-enhanced droplet motion is caused by a viscosity-suppressed deformation of the droplet-air interface. We find that the air film (plastron) trapped within the micro/nanostructure of the superhydrophobic coating plays an interesting and important role in controlling fluid flow beyond a mere reduction in contact area and friction. [1] D. Richard and D. Quéré, Europhys. Lett. 48 (1999). [2] T. Mouterde, P. S. Raux, C. Clanet, and D. Quéré, Proc. Natl. Acad. Sci. USA 116 (2019). [3] M. Vuckovac, M. Backholm, J. V. I. Timonen, and R. H. A. Ras, Science Advances 6 (2020). |
| Date | Start: 05.02.2021, 10:15 Uhr Ende: 05.02.2021 , 11:15 Uhr |
| Location |
Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS) (Am Faßberg 17) Video conference at www.zoom.us, Meeting ID: 980 3913 9623, Passcode: 050762 |
| Contact |
0551/5176-260 oliver.baeumchen@ds.mpg.de |