In this case, clusters act as pinning sites resulting in
an increase of t. However, it is quite possible that water does not
penetrate the nanocrevices that exist on the surface of the protruding
clusters because of the Laplace pressure. At elevated particle concentrations (Fig. 2d–f) the clusters become dense forming thus
a continuous rough surface resulting in high and low s and t
for water droplets, respectively. Superhydrophobicity and water
repellency are sustained by any surface corresponding to particle
concentration >1% w/w.