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Biomimetic Multi-Functional Superamphiphobic FOTS-TiO2 Particles beyond Lotus Leaf
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posted on 2016-09-22, 00:00 authored by Liwei Chen, Zhiguang Guo, Weimin LiuIt
is widely known that natural examples like lotus leaves can
only repel room-temperature water but cannot repel hot water and oils.
Even though superamphiphobic surfaces composed of re-entrant “mushroom-like”
or “T-shaped” structures are promising, they are generally
regarded as substrate-dependent and difficult to fabricate, and hence,
their practical use on various materials has been limited. Here, we
synthesize a flower-like superamphiphobic FOTS-TiO2 powder
by solvothermal process and self-assembly functionalization. These
structured and functionalized submicron particles can repel the liquids
with surface tension as low as 23.8 mN·m–1 (n-decane), which is the lowest among powder samples. With
respect to the biomimetic aspect, the surface morphology of FOTS-TiO2 particle is similar to the hierarchical micro/nano-structures
of the lotus leaf surface, but it is beyond the lotus leaf for superoleophobic
capacity. The difference in the oleophobicity is suggested to be the interplay of
quasi-spherical re-entrant structure and perfluorined modification.
Because of superior superamphiphobicity of the powder, a facile yet
versatile strategy is developed, adhesive-assisted sieve deposition
fabrication (AASDF), for preparing superamphiphobic coatings on various
substrates. The investigation results pertaining to the water/oil
proofing, mechanical durability, self-cleaning, and antifouling performances
prove that the FOTS-TiO2 coating is robust and multifunctional,
which will enable more opportunities for practical applications. Apart
from these general applications, we find that the superamphiphobic
FOTS-TiO2 powders when coated on sponge as anti-icing surface
have good ice delay and icephobic performances. Furthermore, they
can be used to prepare magnetic Fe3O4&FOTS-TiO2 composite particles through liquid marbles, implying significant
scientific value.
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Lotus Leafsolvothermal processinvestigation resultsanti-icing surfaceFOTS-TiO 2 coatingpowder samplessurface morphologyflower-like superamphiphobic FOTS-TiO 2 powdersurface tensionlotus leafFOTS-TiO 2superamphiphobic coatingsfunctionalized submicron particlesroom-temperature waterperfluorined modificationbiomimetic aspectsuperamphiphobic FOTS-TiO 2 powdersFOTS-TiO 2 particleFe 3 O 4superoleophobic capacityquasi-spherical re-entrant structureice delayantifouling performancessuperamphiphobic surfacesAASDFlotus leaf surfaceself-assembly functionalizationicephobic performancesadhesive-assisted sieve deposition fabricationBiomimetic Multi-Functional Superamphiphobic FOTS-TiO 2 Particles
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