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Paper text:
the first two parts of the video show the impact dynamic of 30 @xmath0l water droplet at different impact velocity . at low impact velocity of 1.03 m / s ,
the water droplet deforms upon impact and eventually bounces off completely of the surface of the array . at higher impact velocity of 2.21 m
/ s , the droplet breaks up into many smaller droplets and eventually bounces off completely of the surface of the array .
the coefficient of restitution of water droplet at very low impact velocity can be seen clearly by dropping a water droplet on a slightly tilted carbon nanotube array . at tilt angle of 2.5
@xmath1 the droplet skips off of the surface of the array multiple times without showing any sign of pinning on the surface of the array , as demonstrated in the third part of the video .
the fourth part of the video shows the sliding / rolling behavior of the droplet along the surface of a u - shaped carbon nanotube array .
the fifth part of the video shows the impact of two identical 14 @xmath0l water droplets to one another on a u - shaped carbon nanotube arrays . upon impact , these two water droplets , which come from the opposite direction , merge to form one larger droplet .
all parts of the video were captured by high speed camera operated at various frame rates .
the droplet was illuminated from behind with a diffuse halogen light .
the droplet was dropped on the surface by flat - tipped needle and the volume of the droplet was controlled precisely by syringe pump .
+   + this work was supported by the charyk foundation and the fletcher jones foundation .
over the past few decades , superhydrophobic materials have attaracted a lot of interests , due to their numerous practical applications . among various superhydrophobic materials , 
 carbon nanotube arrays have gained enormous attentions simply because of their outstanding properties . 
 the impact dynamics of water droplet on a superhydrophobic carbon nanotube array is shown in this fluid dynamics video .