Problem:

I am an engineering student studying how electric fields affect cells, specifically the phenomena of electroporation in living cells.

I know that electroporation is widely used for introducing genes into cells, but running a full transfection experiment is not so feasible in the lab I am working in.

Question: If I want to demonstrate the principle of electroporation, i.e. that cells open up and intake substances from the environment, by using some kind of a dye which i can later visualize, what could be a good model for this type of experiment? Specifically - what dye, what cells could be used for this?