Droplets move over viscoelastic substrates by surfing a ridge

Karpitschka S., Das S., van Gorcum M., Perrin H., Andreotti B. & Snoeijer J.H., Nature Comm., 6, 7891, (2015)

Liquid drops on soft solids generate strong deformations below the contact line, resulting from a balance of capillary and elastic forces. The movement of these drops may cause strong, potentially singular dissipation in the soft solid. Here we show that a drop on a soft substrate moves by surfing a ridge : the initially flat solid surface is deformed into a sharp ridge whose orientation angle depends on the contact line velocity. We measure this angle for water on a silicone gel and develop a theory based on the substrate rheology. We quantitatively recover the dynamic contact angle and provide a mechanism for stick–slip motion when a drop is forced strongly : the contact line depins and slides down the wetting ridge, forming a new one after a transient. We anticipate that our theory will have implications in problems such as self-organization of cell tissues or the design of capillarity-based microrheometers.

Haut de page

À lire aussi...

Turning bacterial suspensions into a "superfluid"

H.M. Lopez, J. Gachelin, C. Douarche, H.Auradou, E. Clément ; Phys. Rev. Lett., 115, 28301, (2015) The rheological response under simple shear of (...) 

> Lire la suite...

Bioinspired turbine blades offer new perspectives for wind energy

V. Cognet, S. Courrech du Pont, I. Dobrev, F. Massouh, B. Thiria ; Proc. Roy. Soc. A, 473, (2017) Wind energy is becoming a significant (...) 

> Lire la suite...


Informations Pratiques

Laboratoire : 01 40 79 45 22
Directeur : Philippe Petitjeans
Administratrice : Frédérique Auger (01 40 79 45 22)
Gestionnaire : Claudette Barez (01 40 79 58 53)
Courriel : dir (arobase) pmmh.espci.fr

Nous rendre visite