Surface modifications of hydroxyapatite ceramics in aqueous media

• Published in: Biomaterials Vol. 15; no. 4; pp. 269 - 272
• Main Authors: Amrah-Bouali, S., Rey, C., Lebugle, A., Bernache, D.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.03.1994; Elsevier Science
• Subjects: Biological and medical sciences; Calcium - analysis; Calcium Phosphates - analysis; Durapatite - analysis; Electron Probe Microanalysis; hydrolysis; Hydroxyapatite; Medical sciences; Phosphorus - analysis; Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects); Spectrophotometry, Infrared; surface characterization; Surface Properties; Technology. Biomaterials. Equipments. Material. Instrumentation; X-ray photoelectron spectroscopy; IR; Hydroxyapatite; surface characterization; hydrolysis; X-ray photoelectron spectroscopy; Characterization; Hydrolysis; Infrared spectrometry; Aqueous medium; X ray spectrometry; Biomaterial; Surface analysis; Ceramic materials
• ISSN: 0142-9612; 1878-5905
• DOI: 10.1016/0142-9612(94)90050-7

Hydroxyapatite (HA) surfaces exposed, at room temperature, to various aqueous media of different compositions (distilled water, saline solution, cell culture media, saturated HA solution) have been studied by X-ray photoelectron spectroscopy (XPS) angular analysis and IR reflectance spectroscopy. An important decrease of the Ca/P atomic ratio of the surface layer was seen on all exposed surfaces, reaching 1, the Ca/P ratio of dicalcium phosphate dihydrate (DCPD) for the uppermost surface layer. Furthermore, HPO 4 2− ions were observed by XPS and IR. These chemical changes seem to be related to an equilibration process of the surface independent of the dissolution mechanism. Despite the Ca/P ratio observed, no specific phosphate ion environments, such as that of DCPD, were seen by IR.