Calcium hydroxyapatite coatings showing bioactive properties have been deposited by a
sol−gel dipping method onto Ti6Al4V alloy substrates from aqueous precursor sols. To obtain
homogeneous and monophasic hydroxyapatite coatings, the aging time and temperature of
the sol were, fundamentally, the variables studied. The pH measurement was a good tool to
evaluate the best conditions of the sols to deposit these coatings. SEM and SFM techniques
show that the coatings deposited are dense and homogeneous with a low roughness, which
depends on the sol viscosity and the film thickness.
Bioactive CaO-SiO 2 -poly(dimethylsiloxane) (PDMS) organic-inorganic hybrid coatings over Ti6Al4V substrates have been prepared for the first time by using a sol-gel dip-coating method. The influence of the sol viscosity upon the film formation was investigated. When the new CaO-SiO 2 -PDMS coatings were soaked in a fluid mimicking human plasma for 7 days, a new nanocrystalline phase over all the investigated films was formed. The use of several complementary characterization techniques makes it possible to identify the material formed over the coating surfaces as a nanocrystalline apatite-like phase. These hybrid coatings can be of interest in the orthopedic and dentistry industries because of their bioactive behavior.
Bioactive organic-inorganic hybrids, CaO-SiO 2 -poly(dimethylsiloxane) (PDMS) and CaO-SiO 2 -poly(vinyl alcohol) (PVA), were synthesized by a sol-gel method and characterized before and after soaking in Kokubo´s Simulated Body Fluid (SBF). The synthesis conditions to obtain monoliths were established in both series. CaO-SiO 2 -PDMS hybrids presented elastic behavior when TEOS:PDMS molar ratio was under 3.5, and they showed in vitro bioactivity when Ca(NO 3 ) 2 .4H 2 O:TEOS molar ratio was close to 0.10. Moreover, the relative amount of H 2 O used for TEOS hydrolysis also played a role in their mechanical behavior and in vitro bioactivity. In the CaO-SiO 2 -PVA hybrids, the presence of PVA favored both the synthesis of crack-free monoliths as well as a marked degradation, around to 50 wt-%, for the first 6 h in SBF. All the studied compositions presented in vitro bioactivity. In addition, PVA contents played a major role in the in vitro behavior.
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