Its been done before (Score 1)

although on a really small scale. Manoj Chaudhury and George Whitesides (Harvard) published their results on making a water droplet move uphill on a gradient of surface energy. The water droplet moves (very slowly) from hydrophobic (lower part of inclined glass slide) to hydrophilic (higher part of inclined slide) region on the slide. Pretty cool. It was Published in Science a few years ago.