Sol-gel-derived SiO2-CaO-P2O5 layer with superhydrophilicity and superoleophilicity properties

Abstract

Sol-gel-derived bioactive SiO2-CaO-P2O5 glass layer was prepared. After soaked in simulated body fluid (SBF), a flower-like structure was formed on the glass layer surface. With the increasing soaking time in SBF solution, the SiO2-CaO-P2O5 glass layer showed enhanced superhydrophilicity and weakened superoleophilicity behaviors. The different special surface composition and morphology induced by the various soaking time in SBF solution are the two important aspects that is responsible for such unusual properties.