Abstract
We have recently fabricated super-hydrophobic membrane surfaces based on the inspirationof self-cleaning silver ragwort leaves. This biomimetic super-hydrophobic surface was composedof fluoroalkylsilane (FAS)-modified layer-by-layer (LBL) structured film-coated electrospunnanofibrous membranes. The rough fibre surface caused by the electrostatic LBL coating ofTiO2 nanoparticles and poly(acrylic acid) (PAA) was used to imitate the rough surface ofnanosized grooves along the silver ragwort leaf fibre axis. The results showed that the FASmodification was the key process for increasing the surface hydrophobicity of thefibrous membranes. Additionally, the dependence of the hydrophobicity of themembrane surfaces upon the number of LBL coating bilayers was affected bythe membrane surface roughness. Moreover, x-ray photoelectron spectroscopy(XPS) results further indicated that the surface of LBL film-coated fibresabsorbed more fluoro groups than the fibre surface without the LBL coating. A(TiO2/PAA)10 film-coated cellulose acetate nanofibrous membrane with FASsurface modification showed the highest water contact angle of162° and lowestwater-roll angle of 2°.
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