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Water Droplets’ Internal Fluidity during Horizontal Motion on a Superhydrophobic Surface with an External Electric Field

2009; American Chemical Society; Volume: 26; Issue: 3 Linguagem: Inglês

10.1021/la903730k

1520-5827

Munetoshi Sakai, Hiroki Kono, Akira Nakajima, Hideki Sakai, Masahiko Abe, Akira Fujishima,

Electrohydrodynamics and Fluid Dynamics

On a superhydrophobic surface, the internal fluidity of water droplets with different volumes (15, 30 microL) and their horizontal motion in an external electric field were evaluated using particle image velocimetry (PIV). For driving of water droplets on a superhydrophobic coating between parallel electrodes, it was important to place them at appropriate positions. Droplets moved with slipping. Small droplets showed deformation that is more remarkable. Results show that the dielectrophoretic force induced the initial droplet motion and that the surface potential gradient drove the droplets after reaching the middle point between electrodes.