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Evaporation of water droplets deposited on metal and polymer substrates wasstudied. The evaporated droplet demonstrates different behaviors on low-pinning(polymer) and strong-pinning (metallic) surfaces. When deposited on polymersurfaces, the evaporated droplet is featured by stick-slip sliding, whereas onstrong-pinning metallic surfaces it does not show such kind of motion anddemonstrates the giant contact-angle hysteresis. Stick-slip motion of dropletsis described satisfactorily by the Shanahan-Sefiane model relating this kind ofmotion to surmounting potential barriers caused by the pinning of the triple(three-phase) line. The experimentally established "stick" times coincide withthe values predicted by the Shanahan-Sefiane theory. The values of potentialbarriers are reported. The notion of the equilibrium contact angle is refined.

Evaporation of droplets on strong and low-pinning surfaces and dynamics of the triple line