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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: Wetting, Fluidics and Liquids at Interfaces and Surfaces II (joint session CPP/DY)
CPP 44.4: Talk
Thursday, March 30, 2023, 10:15–10:30, MER 02
Stick-slip Contact Line Dynamics in Forced Wetting of Polymer Brushes — •Daniel Greve1, Simon Hartmann1, and Uwe Thiele1,2 — 1Institut für Theoretische Physik, WWU Münster — 2Center for Nonlinear Science (CeNoS), WWU Münster
We study the wetting of adaptive substrates using a mesoscopic hydrodynamic model for a liquid droplet on a polymer brush, refining the model in [1].
First, we show that Young’s law still holds for the macroscopic equilibrium contact angle and that on the mesoscale a Neumann-type law governs the shape of the wetting ridge (comparable to the case of elastic substrates [2]). Further, we numerically examine the wetting ridge dynamics for a moving meniscus, i.e., we consider an “inverse Landau-Levich geometry” where a brush-covered plate is introduced into a bath. We find stick-slip motion in good qualitative agreement with experimental observations [3,4] and discuss criteria for the onset of the corresponding instability.
[1] U. Thiele and S. Hartmann, Eur. Phys. J.-Spec. Top., 2020, 229, 1819-1832.
[2] B. Andreotti and J. H. Snoeijer, Annu. Rev. Fluid Mech., 2020, 52, 285-308.
[3] S. Schubotz et al., Adv. Colloid Interface Sci., 2021, 294, 102442.
[4] L. Wan, X. Meng, Y. Yang, J. Tian and Z. Xu,Sci. China Chem., 2010, 53, 183-189.