Physical ageing of spreading droplets in a viscous ambient phase

TL;DR

This paper investigates the slow, aging-like spreading behavior of water droplets on oil-immersed surfaces, attributing it to nanoscale topographic features that induce metastable states affecting wetting dynamics.

Contribution

It introduces an analytical model linking nanoscale surface features to slow spreading regimes, advancing understanding of wetting kinetics on complex surfaces.

Findings

Observed a slow kinetic spreading regime not explained by existing models

Quantified the influence of nanoscale topography on wetting behavior

Developed an analytical model describing metastable states affecting spreading

Abstract

Nanoscale topographic features of solid surfaces can induce complex metastable behavior in colloidal and multiphase systems. Recent studies on single microparticle adsorption at liquid interfaces have reported a crossover from fast capillary driven dynamics to extremely slow kinetic regimes that can require up to several hours or days to attain thermodynamic equilibrium. The observed kinetic regime resembling physical ageing in glassy materials has been attributed to unobserved surface features with dimensions on the order of a few nanometers. In this work, we study the spontaneous spreading of water droplets immersed in oil and report an unexpectedly slow kinetic regime not described by previous spreading models. We can quantitatively describe the observed regime crossover and spreading rate in the late kinetic regime with an analytical model considering the presence of periodic metastable states induced by nanoscale topographic features (characteristic area ~4 nm^2, height ~1 nm) observed via atomic force microscopy. The analytical model proposed in this work reveals that certain combinations of droplet volume and nanoscale topographic parameters can significantly hinder or promote wetting processes such as spreading, wicking, and imbibition.