Zastosowanie spektroskopii ramanowskiej do analizy powłok hydroksyapatytowych natryskanych plazmowo
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Abstract
W artykule zostały przedstawione wyniki badań powłoki hydroksyapatytowej naniesionej metodą plazmową. Analiza zmian struktury naniesionej powłoki została przeprowadzona metodą spektroskopii ramanowskiej. W celu oszacowania niejednorodności struktury fizykochemicznej wykonano mapowanie wybranego fragmentu powierzchni powłoki pod kątem lokalnych zmian. Do oceny ilościowej występowania hydroksyapatytu w stosunku do innych form fosforanów wapnia wykorzystano parametr w postaci stosunku inten- sywności pasma charakterystycznego grupy hydroksylowej (OH-) do pasma modu pełnosymetrycznego kompleksu PO43-. Badania wykonano dla dwóch rozdzielczości przestrzennych: niska rozdzielczość - krok 25μm, wysoka rozdzielczość - krok 5 μm. Stwierdzono znaczne wahania wartości zdefiniowane- go parametru w obrębie całego badanego fragmentu powłoki, co wskazywało na znaczny i niejednorodny rozkład hydroksyapatytu. Badanie miało na celu ocenę możliwości testowania powłok endoimplantów przy użyciu map ramanowskich.
Possibilities of application Raman spectroscopy to analysis of plasma sprayed hydroxyapatite coatings
Abstract
This paper contains results of the study of a hydroxyapatite coating deposited by plasma spraying. Properties variation of a coating was analyzed Raman spectrosocopy method. To assess the heterogeneity of the chemical structure was made the mapping for selected fragment of the surface. To quantify the presence of the hydroxyapatite in relation to other forms of calcium phosphate, ratio of OH to PO4 peaks intensities was used. Mapping was made for both of low (25 μm) and high (5 μm) resolution. There was a significant fluctuations of the structural properties throughout the given fragment of the coating and considerable degradation of hydroxyapatite. The study aimed at evaluating for the possibilities of testing endoimplants coating using Raman mapping.
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