Adsorption and X-ray photoelectron spectroscopy investigation of bisphosphonates on titania and hydroxyapatite surfaces

This study investigates the adsorption of bisphosphonates (BPs) on TiO2, hydroxyapatite (HA), and TiO2+HA composite surfaces. We first examined the adsorption of these molecules on titania particles and explored the influence of UV irradiation through adsorption curves. Our findings indicate that surface irradiation leads to an increase in the adsorbed BP content due to enhanced BP deprotonation and hydroxyl group generation. Additionally, we evaluated the adsorption of BPs on the TiO2, HA, and TiO2+HA surfaces primarily through X-ray photoelectron spectroscopy (XPS). Our results suggest that BPs adsorb onto TiO2 via a condensation reaction between the BPs and titania surfaces, while phosphate and Ca2+ ions coordinate onto HA surfaces. All functionalized films exhibit a water contact angle of zero. Atomic force microscopy (AFM) measurements show that BP adsorption had less impact on titania topography than HA topography, and mixed films demonstrated behavior similar to that of titania films.

Automated summary

This study explores the adsorption behavior of bisphosphonates (BPs) on TiO2, hydroxyapatite (HA), and TiO2+HA composite surfaces. The impact of UV irradiation on BP adsorption was investigated through adsorption curves, revealing an increase in adsorbed BP content due to enhanced deprotonation and hydroxyl group formation. X-ray photoelectron spectroscopy (XPS) analysis indicates that BPs adsorb through condensation reactions with TiO2, while phosphate and Ca2+ ions coordinate with HA. Functionalized films exhibit a water contact angle of zero, and atomic force microscopy (AFM) measurements suggest that BP adsorption has a smaller impact on titania topography compared to HA.