Figure 6 | Scientific Reports

Figure 6

From: Development of hydrophobic paper substrates using silane and sol–gel based processes and deriving the best coating technique using machine learning strategies

Figure 6

Water droplets on (a1) low quality and (a2) high-quality print areas after first print of Ti1; SEM images of paper spray coated with (b) Ti1 ink solution, (c) Ti2 ink solution (EVO 50 (CARL Zeiss) system); (d) Perfectly spherical water droplet on 7 times Ti1 printed paper; (e) Coated paper getting wrinkled and crumpling after the 7th cycle; Static contact angle on paper printed 5 times using (f) Ti1, (g) Ti2 (Contact angle goniometer (DATA Physics OCA 15 EC).

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