Figure S1 from PEEK surface modification by fast ambient-temperature sulfonation for bone implant applications

(a) Contact angle analysis machine with KRÜSS DSA10 instrument and a high-speed camera. (b) Photographic image showing the water contact angle θ on untreated PEEK surface. Scale bar: 2 mm. The solvent is deionised water at 22 ˚C. The average measurement was found to be 77.6±0.3˚.