The lab that I'm in is interested in electrophoretically depositing (EPD) thin films of metal oxides onto a certain conductive substrate. This involves creating a suspension of the metal oxide particles using some sort of charging agent, and usually sonication. The problem with EPD is that it's impossible to tell whether a prep will work without knowing the zeta potential of the suspension. Unfortunately, we're not equipped to make that measurement.
I'm looking at the Malvern Zetasizer Nano and I'm currently in the process of getting a quote for that device, but I think that it's going to be too expensive for our lab to purchase based on some reading that I've done elsewhere. I was wondering if there are any materials chemists here that have done zeta potential measurements, and if someone could point me in the direction of a somewhat cheap, effective device for measuring zeta potential.