Self-cleaning behavior in polyurethane/silica coatings via formation of a hierarchical packed morphology of nanoparticles

- Self-cleaning behavior was imparted to the hydrophilic polyurethane.
- A hierarchical packed morphology is responsible for the superhydrophobicity.
- Prolonged pressing process cannot lead to superhydrophobicity due to migration of TPU.
- Samples exhibited excellent stability against media with a wide range of pH values.