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2015 ; 5
(ä): 14030
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Bioinspired, roughness-induced, water and oil super-philic and super-phobic
coatings prepared by adaptable layer-by-layer technique
#MMPMID26353971
Brown PS
; Bhushan B
Sci Rep
2015[Sep]; 5
(ä): 14030
PMID26353971
show ga
Coatings with specific surface wetting properties are of interest for
anti-fouling, anti-fogging, anti-icing, self-cleaning, anti-smudge, and oil-water
separation applications. Many previous bioinspired surfaces are of limited use
due to a lack of mechanical durability. Here, a layer-by-layer technique is
utilized to create coatings with four combinations of water and oil repellency
and affinity. An adapted layer-by-layer approach is tailored to yield specific
surface properties, resulting in a durable, functional coating. This technique
provides necessary flexibility to improve substrate adhesion combined with
desirable surface chemistry. Polyelectrolyte binder, SiO2 nanoparticles, and
silane or fluorosurfactant layers are deposited, combining surface roughness and
necessary chemistry to result in four different coatings:
superhydrophilic/superoleophilic, superhydrophobic/superoleophilic,
superhydrophobic/superoleophobic, and superhydrophilic/superoleophobic. The
superoleophobic coatings display hexadecane contact angles >150° with tilt angles
<5°, whilst the superhydrophobic coatings display water contact angles >160° with
tilt angles <2°. One coating combines both oleophobic and hydrophobic properties,
whilst others mix and match oil and water repellency and affinity. Coating
durability was examined through the use of micro/macrowear experiments. These
coatings display transparency acceptable for some applications. Fabrication via
this novel combination of techniques results in durable, functional coatings
displaying improved performance compared to existing work where either durability
or functionality is compromised.