Structure-based superhydrophobicity for serum droplets

We report that superhydrophobic (SHPo) surfaces based purely on surface structuring shows a robust super-repellency under a prolonged contact with serum droplet as an example of protein-rich biological fluids. In contrast, normal SHPo surfaces, which are based on surface chemistry and surface structuring, lose repellency and eventually get wetted in the same tests. This is the first report of a SHPo surface maintaining super-repellency to a biological fluid.