Marc that is great info.
If I were going to experiment with the electrowetting droplet methods again, I would get a temperature controller and a toaster oven for precise fabrication and lamination of the PCB's. Refer to the instructions on the web for inkjet PCB etching. Add the additional step after the PCB is done, for temperature controlled lamination. The idea is to adhere a thin film (hydrophobically coated) to the top of the PCB. This allows the PCB to be reused and also reduces arcing (less change in resistivity of the air).
I also tried water droplets-in-oil with the technique. Requires different voltage. The idea is that the sample droplet (water) is encapsulated in an oil droplet. Did not have much success. The benefit is the oil would help solve the evaporation problem. Except then mixing becomes even more of a problem.
Droplets are difficult. DIY time is better spent on milli-fluidics in my opinion.
## Jonathan Cline
## jcline@ieee.org
## Mobile: +1-805-617-0223
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