Covalent grafting of alkyl chains on laser-treated titanium surfaces through silanization and phosphonation reactions

This work evaluates the efficiency of silanization and phosphonation reactions for grafting alkyl chains on surface titanium treated by nanosecond laser. The light blue squama-like oxide layers with dominating anatase rutile were obtained. using alkoxysilanes C12 C18 was attempted in tetrahydrofuran, pure liquid phase vapor phase. octylphosphonic acid performed boiling water solutions. obtained surfaces characterized Raman X-ray photoelectron spectrometry, scanning electron microscopy energy dispersive spectroscopy. Their hydrophobicity evaluated static contact angle measurements. modification silane allowed obtaining high loadings (6 10 at.% Si respectively) grafted groups formation polycondensed layers. tetrahydrofuran resulted partial monolayer coverage. solutions significant P loading (up to 7 at.%) full Both increased laser-treated surfaces. However, is more appropriate since milder conditions chemical functionalization lower concentrations modifier are necessary obtain similar organic hydrophobicity.