Abstract
A novel method for preparing the superhydrophobic polytetrafluoroethylene (PTFE) surface by doped copper (Cu) to alter microtexture (microscale warts) characteristics is proposed. Microscale warts are generated on the PTFE surface by thermal annealing. The present method achieves superhydrophobicity by adjusting Cu content to alter the morphology and distribution of microscale warts on the PTFE surface. As Cu content increases, the average area and percentage of microscale warts increase, but the density of microscale warts on the PTFE surface first increases and then decreases. An appropriate amount and size of microscale warts are obtained at 2.5 vol% Cu content. PTFE surface doped with 2.5 vol% Cu also has the best superhydrophobicity performance (water contact angle is 162.54°, water sliding angle is 5.90°).
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