Application of dissolution experiments to characterise the structure of pulsed laser-deposited calcium phosphate coatings.
A dissolution test was performed with pulsed laser (Nd: YAG, 355 nm)-deposited calcium phosphate coatings composed of hydroxyapatite (HA) and alpha-tricalcium phosphate (alpha-TCP) in different proportions, as a result of the use of different deposition rates. During immersion in a Ca2+-free Hank's solution, the dissolution kinetics were determined while other structural and compositional properties of the coatings were derived. It was possible to infer that the alpha-TCP is distributed uniformly and that the coating is of a non-columnar compact grain structure. The mass ratio of the phases for each coating was also determined and was related to the X-ray diffraction intensities. When incomplete, the hydroxylation level of the HA in the coatings is completed after immersion.
Clèries
L
L
Universitat de Barcelona, Departament de Física Aplicada i Optica, Barcelona, Spain. lcleries@fao.ub.es
Fernández-Pradas
J M
JM
Sardin
G
G
Morenza
J L
JL
D002130:Calcium Phosphates / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D007552:Isotonic Solutions; D007700:Kinetics; D007834:Lasers; D008855:Microscopy, Electron, Scanning; D019736:Prostheses and Implants; D012995:Solubility; D014961:X-Ray Diffraction
D002130:Calcium Phosphates; C072670:Hanks Balanced Salt Solution; D007552:Isotonic Solutions; C485828:alpha-tricalcium phosphate; C485830:tetracalcium phosphate; C485838:calcium phosphate, monobasic, anhydrous; D017886:Durapatite; C020243:calcium phosphate; C485829:calcium phosphate, dibasic, anhydrous