Etched ITO EWOD Devices

Fingernail ITO Device

Alessandro Volpato, Biologist and inventor from Berlin, developed a process to etch ITO coated foil into completely transparent digital microfluidic devices. By applying a photo-resist, then exposing and developing  it like PCBs and finally etching with hydrochloric acid he can print any structure down to 0.1 mm into the conductive ITO coating. A sample I got for my birthday I connected to the OpenDrop and gave it a try. And it works great.

Applications such as use in mobile phone screen are possible ( http://bioengineering.illinois.edu/news/article/23435 ).

Etched ITO EWOD Device
The etched ITO foil device. Contacted with cooper tape and silver lacquer.

ITOMicrofluidics
OpenDrop, with spring contact board to connect external device.

ITO_Device
ITO foil covered with parafilm and silicon oil to make it hydrophobic. Droplet from water with blue ink.