Sol-gel derived porous and hydrophilic calcium hydroxyapatite coating on modified titanium substrate

Hydroxyapatite (Ca-10(PO4)(6)(OH)(2): HAp) coatings on titanium substrate were prepared by a sol-gel method combined with dip-coating technique. The influence of Ti substrate modification on the formation of HAp coatings was also investigated. To achieve a better quality of HAp coatings, Ti substrates were modified by adding a calcium titanate (CaTiO3) sublayer or additional preheating at 650 degrees C. The thermal behavior of Ca-P-O and Ca-Ti-O precursor gels was investigated by thermogravimetric (TG-DTG) measurements. X-ray diffraction (XRD) analysis was employed to characterize the phase composition of synthesized coatings. Scanning electron microscopy (SEM) was used to study the morphological features of CaTiO3 sublayers and HAp coatings surfaces. Contact angle (CA) measurements were used to evaluate the hydrophilic/hydrophobic properties of the end products. (C) 2016 Elsevier B.V. All rights reserved.