The DLS particle size analyzer has the advantages of accuracy, rapidity, and good repeatability for the measurement of Nano particles, emulsions or suspensions. (1) -20.6 mV (2) -16.8 mV (3) -9.9 mV (4) +13.9 mV (5) +15. Dynamic light scattering (DLS), also known as photon correlation spectroscopy (PCS), is a commonly used characterization method for nanoparticles. The following graph visualizes the effect with five examplatory samples: Because analysis of the zeta potential is much easier and faster to perform than a stability measurement, the zeta potential is often used to assess the quality of the dispersion.Ĭhanging the electrolyte composition and concentration leads to a shift of the zeta potental. The zeta potential is not a direct measurement of the stability of a dispersion, but it provides a good prediction of stability. At a zeta potential close to zero, the repulsive effect of the electrical double layer is small, and coagulation is more likely to occur. ![]() This prevents the particles from coming close to each other and forming agglomerates.Īccording to DLVO theory, when the particles are close to each other, van der Waals forces come into effect, which are based on dipole-dipole interactions. It is based on the Brownian motion of particles - this states that smaller particles move faster, while larger ones move slower in a liquid. ![]() When particles carry a strongly positive or strongly negative zeta potential, there is also a strongly repulsive electrostatic interaction between the particles. Dynamic Light Scattering (DLS) is an established and precise measurement technique for characterizing particle sizes in suspensions and emulsions.
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