My experiences with CEP so far:
Propylencarbonate seems to be an excellent solvent for CEP. Not dangerrous and good physical properties. I work with 20wt% and 30wt% solution to create 1-3µm or 4-10µm layers. On a 1.5µm layer we need 35V to move a water droplet, on a 7µm layer we need 65V for a good moveablity. But those thin layers seem to be quite fragile, got breakdowns within minutes or even seconds. My first thick-layer chip was stable over 30 minutes at 60-85V, before I got one breakdown.
Do you know this situation: you playing around with a new chip, DI-water, moderat voltage and you be happy about the quick and precise movements or a long time. Then you add another fluid, for example water with some dye, and blubblub frzzlzlzlzl srrrrrrr it broke down. Are there fluids or additives, which let a chip break? (I don’t think, that it pass/dissolve the teflon layer)
My spincurves are quite nice, and the layer look fine. But on larger areas (chips ^^) i always get some particles in it. The 30wt% solution is so thick, that I cannot push it through a normal siringe filter. Any ideas, how I could filter it?