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

Figure 6

Transmission spectra of the OEW-chip without droplets (black dotted), of the chip with sodium hydroxide droplet (black line), of the chip with the phenolphthalein droplet (gray line), and after reaction of phenolphthalein and sodium hydroxide (purple line).