Artículos
Título:
Permanent superhydrophobic polypropylene nanocomposite coatings by a simple one-step dipping process
Autor/es:
CINTIA CONTRERAS; GABRIELA CHAGAS; MIRIAM STRUMIA; DANIEL WEIBEL
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 307 p. 234 - 234
Resumen:
uperhydrophobic nanocomposite coatings on injection-molded polypropylene (PP) samples were prepared
by dipping in xylene solvent containing titanium dioxide nanoparticles (NPs) functionalized with
trimethoxypropyl silane. Alternatively, PP samples were dipped in a mixture of functionalized NPs and
dissolved PP pellets. As a general result, dip-coated PP samples reached a permanent superhydrophobic
state with a contact angle hysteresis (CAH) depending on NPs concentration and surface chemistry. SEM
and profilometer measurements show a general trend in the decrease of CAH with the increase of aggregates
and roughness. However some results showed that surfaces with the same roughness presented
different CAHs. XPS measurements showed that low CAHs and self-cleaning properties were obtained
only when the Ti?OH relative concentration on the surface was about 20%. At higher Ti?OH relative concentrations,
the surface kept a superhydrophobic static state but lost its self-cleaning pro