Effect of HAP decomposition on the corrosion behavior of Ti–HAP biocomposites

Abstract

Ti–HAP biocomposites are gained attention for combining the attractive properties of Ti and hydroxyapatite (HAP). However, the decomposition of HAP at elevated processing temperatures is a major concern since it can lead to structural flaws and may deteriorate the corrosion resistance of Ti. The present study aims to investigate the corrosion behavior of Ti–HAP composite processed by powder metallurgy by performing potentiodynamic polarization and electrochemical impedance spectroscopy in 0.9 wt% NaCl solution at body temperature. Results show that the presence of Ti lowers the HAP decomposition temperatures resulting in the formation of HAP‐depleted zones acting as electrochemically active sites, decreasing the corrosion resistance.

Yb–Gd Codoped Hydroxyapatite as a Potential Contrast Agent for Tumor-Targeted Biomedical Applications

“…Fluorescence-conjugated nanomaterials developed as multifunctional platforms are powerful in cancer diagnosis and therapy, which attracts significant attention nowadays. − These nanoparticles (NPs) could be divided into several types: fluorescent dye-doped NPs, , semiconductor quantum dots, , metal nanoclusters, , rare-earth NPs, , and fluorescent carbon-based nanomaterials. , Generally, NPs are synthesized from a host system and doping material to exploit the advantages of both elements . Among nanomaterial hosts, hydroxyapatite (HAp), which possesses a unique hexagonal structure and actively replaceable Ca 2+ units, has been investigated in several studies. , Accordingly, numerous studies have revealed that several free ions, such as monovalent Na + ; divalent Zn 2+ , Cu 2+ , and Mg 2+ ; − trivalent Au 3+ and Ag 3+ ; , tetravalent Ti 4+ and Zr 4+ , − can be replaced with the Ca 2+ ions of HAp, indicating the host potential of doped HAp in biomedical applications.…”