Contact angle versus Ar plasma exposure time.

<p>Effect of Ar plasma treatment time on wettability of a) RTV 615, b) RTV 655, and c) Sylgard 184 polymer samples. Prior to any plasma exposure (t = 0 sec) all three polymers show strong hydrophobicity. After 60 sec of Ar plasma treatment contact angles have dropped by at least 50%. All three polymer types are completely wetting at t = 120 sec and beyond.