In focus of DLS-Zeta potential (ZP) analyser the study is related to colloidal suspension, flocculation and dispersion of particles in any of the particular solvents.
Before, you going to start a test with ZP is must be awarable of electrophoresis and colloidal chemistry concept.
1. Molecular size
2. Particle size
3. Molecular weight
4. Zeta potential
The above parameters are to be analysed and which are in-depth as u expected.
Whereas, in the case of DLS-Particle size distribution (PSD) its different from ZP. But totally ZP is indirect method for finding particle size distribution. I don't know what are your research stage.either beginner or intermediate.
But accordingly, im sure, It must be delivered the stage of liquid phase and electrostatic charge as a function of repulsion/atrraction mate.