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TF-XRD profiles on the surfaces of Samples N: untreated PEEKs (denoted as “N”) and SPA: sulfuric acid + oxygen plasma + modified-SBF-treated PEEKs before (denoted as “0d”) and after immersion in SBF for 1 day (denoted as “1d”) for (a) pure PEEK and (b) 50C-PEEK.
