Previously, the authors have already described a study in which the surface properties of calcium phosphate ceramics were changed significantly by chemical modification using silane coupling reagents. In the present study, surface analyses ofthese modified calcium phosphate ceramics have been performed by infrared (IR) spectroscopy, differential thermal analysis (DTA), mass, spectroscopy; and surface area measurements. IR and DTA studies suggest that hydroxy groups on the ceramic surface arecovalently bound to the silane coupling species. Elemental analyses and surface area measurements of the surface-modified ceramics proved that the number of organic groups introduced onto the surfaces was almost the same for each silane coupling reagentused under the same reaction conditions. The pores on the surface were found to be blocked by the introduced organosilicon groups with pore volume decreasing with increasing chain length. This proves, therefore, that the silane coupling species which were introduced onto the ceramic surface were not decomposed in the process of the modification.
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