The zeta potential can be calculated with the Henry function. Malvern Panalytical Zetasizer Nano The Malvern Zetasizer range provides both exceptionally high performance and entry level systems that incorporate combinations of a particle size analyzer, zeta potential analyzer, molecular weight analyzer, protein mobility and microrheology measurements. Particles with higher potential have a higher speed in the electrical field.
Practically the measurement is carried out by applying a defined voltage to two electrodes in the cell leading to different speeds of the particles. Again the light is scattered by the particles and fluctuations of the light intensity at the detector, which are a function of the particle velocity, get recorded. The measurement of the zeta potential is performed with the Zetasizer Nano indirectly by measuring the electrophoretic mobility by laser Doppler velocity measurements in a special cell. of the particle size in this DLS (dynamic light scattering) analyzer bases on. The described two layers are called the electrochemical double layer. The Zetasizer Nano ZS from Malvern can detect three different particle. The potential at this boundary layer is called zeta potential. Hence the boundary is also the shear surface of the particle to the surrounding liquid. The size of the metal oxide NPs and agglomerates in solution were calculated by DLS and LDV using a Malvern Instruments Zetasizer Nano-ZS Instrument. Outside the boundary this directed movement does not exist. Compatible with: Zetasizer Nano ZSP Zetasizer Nano ZS Zetasizer Nano S Zetasizer Nano Z Zetasizer Nano ZS90 Zetasizer Nano S90 USB 2. The Smoluchowski model was used to evaluate the zeta potential from the hydrodynamic radius calculated from the auto correlation function and the electrophoretic mobility using the integrated PALS system, with the constants of pure water at 25 C ( 0.8872 mm 2 s 1. Within this boundary layer, the ions move with the movement of the whole particle in the same direction. Solution zeta potentials were measured with a Zetasizer Nano ZS, Malvern.
Another more diffuse layer of charged particles follows, in which a stable conformation forms. The counter ions are bound strongly to the surface of the charged particle. On the surface of charged particles a layer of counter ions exists – the so-called Stern layer with the Stern potential.