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Enhancement of hydroxyapatite dissolution through structure modification by Krypton ion irradiation

Hydroxyapatite synthesized by a wet chemical route was subjected to heavy Krypton ion irradiation of 4MeV at various fluences. Glancing incidence Xray diffraction results confirmed the phase purity of irradiated HA with a moderate contraction in lattice parameters, and further indicated the irradiation induced structural disorder, evidenced by broadening of the diffraction peaks. High resolution transmission electron microscopy observations indicated that the applied Kr irradiation induced significant damage in the hydroxyapatite lattice. Specifically, cavities were observed with their diameter and density varying with the irradiation fluences, while a radiation induced crystalline to amorphous transition with increasing ion dose was identified. Raman and Xray photoelectron spectroscopy analysis further indicated the presence of irradiation induced defects. Ion release from pristine and irradiated materials following immersion in Trisbuffer showed that dissolution in vitro was enhanced by irradiation. We examined the effects of irradiation on the early stages of the mouse osteoblast like cells response. A cell counting kit 8 assay was carried out to investigate the cytotoxicity of samples, and viable cells can be observed on the irradiated materials.