Lithography-Free Technology for the Preparation of Digital Microfluidic (DMF) Lab-Chips with Droplet Actuation by Optoelectrowetting (OEW)

Figure 1

Photographs showing that the analyte and solvent might chemically react with the layer sequence, thus prohibiting the multiple use of the chip. Wherever droplets have touched the layers upon their actuation, surface modifications have taken place. The photograph in the inset shows a larger area of the chip under oblique observation. The droplet has been moved slightly away from the position, where it sat during an analytical run. Modified surface spots are revealed.