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Biocompatibility of sol-gel hydroxyapatite-titania composite and bilayer coatings

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2017
auteur(s) Sidane Djahida; Rammal H.; Beljebbar A.; Gangloff S.C.; Chicot Didier; Velard F.; Khireddine Hafit; Montagne Alex; Kerdjoudj H.
journal (abréviation) Materials Science and Engineering: C (Mater Sci Eng)
volume (numéro) 72
pages 650 – 658
résumé Titania-Hydroxyapatite (TiO2/HAP) reinforced coatings are proposed to enhance the bioactivity and corrosion resistance of 316L stainless steel (316L SS). Herein, spin- and dip-coating sol-gel processes were investigated to construct two kinds of coatings: TiO2/HAP composite and TiO2/HAP bilayer. Physicochemical characterization highlighted the bioactivity response of the TiO2/HAP composite once incubated in physiological conditions for 7 days whereas the TiO2/HAP bilayer showed instability and dissolution. Biological analysis revealed a failure in human stem cells adhesion on TiO2/HAP bilayer whereas on TiO2/HAP composite the presence of polygonal shaped cells, possessing good behaviour attested a good biocompatibility of the composite coating. Finally, TiO2/HAP composite with hardness up to 0.6 GPa and elastic modulus up to 18 GPa, showed an increased corrosion resistance of 316L SS. In conclusion, the user-friendly sol-gel processes led to bioactive TiO2/HAP composite buildup suitable for biomedical applications.
mots clés Stainless steel 316L; Surface coating; Hydroxyapatite; Titania; Stem cells; Biocompatibility
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