posted on 2019-05-06, 00:00authored bySohei Kaneko, Chihiro Urata, Tomoya Sato, Roland Hönes, Atsushi Hozumi
Smooth and transparent
hydrophilic films showing excellent water
sliding properties were prepared by using a sol–gel solution
of 2-[methoxy (ethyleneoxy)10 propyl]trimethoxysilane and
tetraethoxysilane. The resulting hybrid films were statically hydrophilic
(static water contact angles (CAs) were in the range of 30–45°),
but water droplets (50 μL) could move smoothly on an inclined
surface (minimum sliding angle was 6°) without pinning or tailing
because of low CA hysteresis (5 ± 1°). Thanks to this hybrid
film formation on aluminum (Al) substrate, drainage performance during
condensation and frosting/defrosting markedly improved compared to
that on hydrophilic, bare Al, or hydrophobic monolayer-covered Al
substrates.