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(A) SEM photographs; (B) white light interferometer oblique topographical plots; and (C) water droplet wetting angle photographs and measurements of (a) Af-Si3N4, (b) N2-Si3N4, (c) Gl-Si3N4, (d) Ox-Si3N4, (e) PEEK, and (f) Ti6Al4V. This image is adapted with permission from ref. [103]. Copyright 2017 Willey publishing group.
