Superspreading without surfactants: Dielectrowetting
When a droplet is put on a surface it spreads out, but how fast does it spread and how far can it spread?
|A droplet of oil induced to wet a non-wetting substrate by an applied voltage.|
Our experiments use a non-uniform electric field to create a force on the dipoles of a dielectric liquid.For droplets this forces them to set surfaces what we call "dielectrowetting". This allows a voltage to be used to "dial up" the final state of a droplet. This can be a droplet, just sufficient to create a film or more than that needed to create a film. One does not need to wait for a film to form - the difference can be seen in how fast a droplet spreads.
Dielectrowetting driven spreading of droplets,
Physical Review Letters 107 (18) (2011) art. 186101. View postprint pdf