SAISEAU, Raphael; PEDERSEN, Christian; BENJANA, Anwar; CARLSON, Andreas; DELABRE, Ulysse; SALEZ, Thomas; DELVILLE, Jean-Pierre

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SAISEAU, Raphael
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

PEDERSEN, Christian
University of Oslo [UiO]

BENJANA, Anwar
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Nature Communications. 2022, vol. 13, p. 7442

Nature Publishing Group

Résumé en anglais

We study the spreading of droplets in a near-critical phase-separated liquid mixture, using a combination of experiments, lubrication theory and finite-element numerical simulations. The classical Tanner's law describing the spreading of viscous droplets is robustly verified when the critical temperature is neared. Furthermore, the microscopic cut-off length scale emerging in this law is obtained as a single free parameter for each given temperature. In total-wetting conditions, this length is interpreted as the thickness of the thin precursor film present ahead of the apparent contact line. The collapse of the different evolutions onto a single Tanner-like master curve demonstrates the universality of viscous spreading before entering in the fluctuation-dominated regime. Finally, our results reveal a counter-intuitive and sharp thinning of the precursor film when approaching the critical temperature, which is attributed to the vanishing spreading parameter at the critical point.< Réduire

Projet Européen

Brownian Motion near Soft Interfaces

Project ANR

Interactions induites par des fluctuations entre interfaces molles dans les systèmes complexes
Mouvement brownien au voisinage d'interfaces molles
Capteur Interférométrique de Contraintes de Surface
Frottements dans les systèmes complexes

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798