SELF-ASSEMBLED SILANE MONOLAYER ON THE SURFACE OF NANOMETRIC PARTICLES OBTAINED USING A SUPERCRITICAL TREATMENT

摘要

The problem of the lack of interfacial interaction between inorganic fillers and organic matrixes has been extensively reported and it requires to be solved in order to obtain stable hybrid composites. The interfacial interaction can be improved by modifying the surface of inorganic fillers with organic bifunctional molecules. Surface modification is addressed in this work through silanization. High quality siloxane monolayers are not easy to synthesize using the traditional solution-phase methodology, mainly because of the difficulty in controlling the amount of water in the liquid medium. This article reports an anhydrous and generic SCCO_2 method for coating the surface of particulate materials through the deposition of self-assembled silane monolayers. The reaction of a trifunctional alkoxysilane with the surface of nanometric hydroxyapatite substrates is reported.