The Zetasizer Nano ZS device allows to measure the size and the zeta potential of particles or molecules in a liquid medium at different temperatures.
The Zetasizer system determines the particle size by first measuring the Brownian motion of the particles in a sample using Dynamic Light Scattering (DLS) and then interpreting a size from this following theorie : the particle size measured is the diameter of the sphere that diffuses at the same speed.
The instrument calculates the zeta potential by determining the Electrophoretic Mobility and then applying the Henry equation. The electrophoretic mobility is obtained by performing an electrophoresis experiment on the sample and measuring the velocity of the particles using Laser Doppler Velocimetry (LDV).