Drops on Chemically Patterned and Superhydrophobic Surfaces
We first consider the dynamics of micron-scale drops moving on chemically patterned substrates. For a drop spreading on a surface with hydrophobic and hydrophilic stripes of the same dimensions as the drop, the final drop shape is determined by the dynamic evolution of the fluid. We use surfaces with regular patterning to explore contact angle hysteresis.
We also model drops moving on a substrate covered by an array of micron-sized posts, a geometry which leads to superhydrophobic behaviour. Here we explore transitions between the fakir and collapsed states, contact angle hysteresis, and the speed with which a drop moves across a superhydrophobic surface.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..