Journal
LANGMUIR
Volume 22, Issue 11, Pages 4906-4909Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la060323u
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In the current study, we used a high-speed camera system with particle image velocimetry to observe the internal fluidity of water droplets during sliding. The droplets' velocity during sliding was controlled by slipping and rolling motions. On the superhydrophobic surface, with a contact angle of 150, the droplet fell at high velocity by slipping. However, on a normal hydrophobic surface whose water contact angle was around 100, both slipping and rolling controlled the droplet's velocity during sliding. In addition, the advancing velocity might be large when the slip velocity is large and the contact area is small.
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