The fabricated coatings exhibit high contact angles and a characteristic
redness due to high temperature treatment of the epoxy. The coatings
are completely opaque due to the ultra-high roughness illustrated
in SEM images (Fig. 2). The uniquemethod of spray coating the hardening
epoxy onto hot surfaces results in the distinctive morphology required
for superhydrophobic properties. The ability to rapidly drive off
the solvent while allowing the epoxy to harden gives rise to a
multiscale, rough surface (Fig. 3). Enhanced by embedded silica nanoparticles
to add a nano-rough texture, coated samples achieve high contact
angles and lowroll-off angles via the entrapment of air inmultiscale
cavities. Despite the high roughness, the coating retains its adhesion to
the substrate as well as resistance to abrasive force. The high durability
of the coating is demonstrated by remaining superhydrophobic after
several mechanical wear tests.