Hi Leandro,

I don't have personal experience with ESA measurements but this book should help you understanding the related effects and also the limits of ESA measurements.

"Characterization of Liquids, Nano- and Microparticulates, and Porous Bodies using Ultrasound (Studies in Interface Science)" by Andrei Dukhin

Hello,

I have experience with both. The most current light scattering instrument using back scattering, can measure up to a couple of percent solids. This is 2 – 3 order of magnitude greater than conventional instruments. As for ESA, this allows you to measure up to, say 40%, solids. There are other factors, however, that may obscure the results. The crowding of particles in a concentrated suspension may simply not give you the same result as in a dilute system. Electrolyte concentration becomes extremely important in a crowded system as double layers are readily overlapping in low ionic strength concentrated dispersion.

Try adding a dispersing agent (1% Daxad) with your sample. That will help reducing the aggregation problem.

and maybe altering the zeta potential...

What is the ultimate goal of this investigation, i.e. in which context do you want to use the data?

Hi Titus,

I am working on codeposition of particles during electroplating. I want to study the effect of zeta potential in the amount of embedded particles.

Keep in mind that particle size and electrolyte concentration may strongly affect the zeta potential. Low electrolyte concentrations will invariably give higher magnitude mobilities, but would not necessarily result in a higher zeta potential. The same holds true for size. This is not obvious if one only considers the Smoluchowski equation for the conversion of mobility to zeta potential, but it is explicit when using e.g. the O’Brien & White model (the Oshima model gives the same).