Spontaneous high-speed transport of subnanoliter water droplet on gradient nanotextured surfaces
2009; American Institute of Physics; Volume: 95; Issue: 6 Linguagem: Inglês
10.1063/1.3197574
ISSN1520-8842
AutoresHwa Seng Khoo, Fan‐Gang Tseng,
Tópico(s)Fluid Dynamics and Heat Transfer
ResumoWe present water droplets that undergo spontaneous self-directed motion upon contact with a chemically patterned nanotextured surface with wedge-shaped gradient. The surface exhibits two distinct wetting properties and low hysteresis. The droplet velocity depends on the droplet position and gradient angle. A wide range of droplet volume can be transported and a droplet velocity as high as 0.5 m/s has been achieved herein. Ascension of water droplets with all-round acclivity and a subnanoliter droplet movement were also demonstrated. We conclude that it is the combination of surface tension gradient and nanowetting actuation that governs the droplet motion.
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