Vishwanath Somashekar wrote:
> b) NaOH (0.3mol/litre) mixed with a littel DI water and then Ethanol
snip...
> On the NaOH side of the channel, after
> running the solutions for about an hour or so, I see black deposits on
> the PDMS.

I am not a chemist, but to me it sounds, as if the NaOH reacts with the PDMS and
sets
carbon free. Check the chemical stability.

Marc