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SEM micrographs and EDX profiles of the surfaces of Samples (a,b) N: untreated PEEKs after immersion in SBF for 7 days, (c,d) S: sulfuric acid-treated PEEKs after immersion in SBF for 7 days, (e,f) SP: sulfuric acid + oxygen plasma-treated PEEKs after immersion in SBF for 7 days, and (g,h) SPA: sulfuric acid + oxygen plasma + modified-SBF-treated PEEKs after immersion in SBF for 1 day for (a,c,e,g) pure PEEK and (b,d,f,h) 50C-PEEK.
