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PARTICLE SIZE DISTRIBUTION + ZETA-POTENTIAL

 

Brookhaven ZetaPals

The instrument is capable to determine the particle size distribution of colloidal particles and nanoparticles and the determination of the zeta potential of charged particles in dilute solutions. The instrument measures the fluctuations in light intensity due to Brownian motion of the particles in order to deduce their particle size (measuring range 2-3 nm to 500 nm). A few ml are required for the measurements. Dynamic light scattering (DLS) or photon correlate spectroscopy (PCS) is used for the particle size distribution analysis. Diffusion coefficients are determined and related tot the particle size. Zeta potential(ζ ) measurements using a cell in which particles are dispersed in a suitable liquid and equipped with two electrodes. An electric field will induce electrophoretic mobility of the charged particles . The direction of the displacement and the velocity are dependent on the sign and the magnitude of the charge respectively. Both parameters, direction and velocity of the particles under the influence of a known electric field, allow to calculate mobility and zeta potential.

Applications

  • Determination of the particle size distribution of nanoparticles (e.g. latex microspheres, metal oxide powders, colloidal suspensions)
  • Determination of the zeta potential