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. 2021 Jan 15;14(2):408. doi: 10.3390/ma14020408

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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SEM images of PEEK surface with different pretreatments. (a) No treatment; (b) 98% sulfuric acid; (c) 9.5% hydrofluoric acid; (d) argon plasma treatment. (Reproduced from [116], with permission from © 2014 Elsevier).

SEM images of PEEK surface with different pretreatments. (a) No treatment; (b) 98% sulfuric acid; (c) 9.5% hydrofluoric acid; (d) argon plasma treatment. (Reproduced from [116], with permission from © 2014 Elsevier).