Superhydrophobic surfaces have great potential for application in self-cleaning and oil/water separation. However, the large-scale practical applications of superhydrophobic coating surfaces are impeded by many factors, such as complicated fabrication processes, the use of fluorinated reagents and noxious organic solvents and poor mechanical stability. Herein, we describe the successful preparation of a fluorine-free multifunctional coating without noxious organic solvents that was brushed, dipped or sprayed onto glass slides and stainless-steel meshes as substrates. The obtained multifunctional superhydrophobic and superoleophilic surfaces (MSHOs) demonstrated self-cleaning abilities even when contaminated with or immersed in oil. The superhydrophobic surfaces were robust and maintained their water repellency after being scratched with a knife or abraded with sandpaper for 50 cycles. In addition, stainless-steel meshes sprayed with the coating quickly separated various oil/water mixtures with a high separation efficiency (>93%). Furthermore, the coated mesh maintained a high separation efficiency above 95% over 20 cycles of separation. This simple and effective strategy will inspire the large-scale fabrication of multifunctional surfaces for practical applications in self-cleaning and oil/water separation.
Orally administered ASMq significantly reduces the severity of HTS in the rabbit ear model. The findings of this study may have clinical implications on the management of human HTS.
Reversible wettability transition
has drawn substantial interest
because of its importance for widespread applications, but facile
realization of such transition on ceramic surfaces, which is promising
for achieving on-demand droplet manipulation under harsh conditions,
remains rare. Herein, superhydrophobic zirconia ceramic surfaces that
can reversibly and repeatedly transit between superhydrophobicity
and superhydrophilicity after alternate heating treatments have been
fabricated using a femtosecond laser. The underlying mechanisms of
the complex wettability transitions on the laser-ablated zirconia
surfaces are elucidated. Hydrophilic polished zirconia surfaces immediately
become superhydrophilic after laser ablation, which is mainly attributed
to the amplification effect of the laser-induced micro/nanostructures
and has no obvious relationship with oxygen vacancies. The obtained
superhydrophilic surfaces are transformed into superhydrophobic surfaces
because of rapid adsorption of airborne organic compounds driven mainly
by physical interaction under heating conditions. With the alternate
removal and re-adsorption of organic compounds, reversible and repeatable
wettability transition between superhydrophobicity and superhydrophilicity
happens on the zirconia surfaces. The laser-induced micro/nanostructures
also contribute to the wettability transitions. Furthermore, utilizing
the superhydrophobic zirconia surfaces with switchable wettability,
on-demand transfer of strong acid droplet in air and oil droplet under
strong acid solution has been achieved. This work will inspire the
environmentally friendly fabrication of switchable superhydrophobic
ceramic surfaces and their multifunctional applications under harsh
conditions.
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