In this study, the multi-angle sizing option (BI-MAS)
of the ZetaPlus (Brookhaven Instruments Corporation)
was used as a DLS instrument both for the measurements
of the size and for the determination of the concentration
of the bentonite particles. The accuracy of the instrument
is ±1–2% with mondisperse samples and the laser used
is a 15 mW solid state laser. All the experiments were