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Fig. 4 | Nanoscale Research Letters

Fig. 4

From: Hierarchical Nanoflowers on Nanograss Structure for a Non-wettable Surface and a SERS Substrate

Fig. 4

Wetting property of hierarchical surface with CuO nanoflowers for various liquids. a The change of contact angles of various liquids as a function of droplet volume using dropping test. b The average contact angle hysteresis of various liquids as a function of surface tension (droplets of liquids have small CAH of <5° roll on the surface). c Continuous optical images of 7 μL, 25 % ethanol droplet which is rolling on the nanoflower applied hierarchical CuO surface (the total rolling time is 203 ms)

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