Zeta potential is a measure of the effective electric charge on the nanoparticle surface. In general, the technique is best used for submicron particles and can be used to measure particle with sizes less than a nanometer. Examples include determining nanogold size, protein size, latex size, and colloid size. What type of material can be used in DLS?Īpplications for Dynamic Light Scattering DLS is most commonly used to analyze nanoparticles. The magnitude of the zeta potential provides information about particle stability. The zeta potential is a measure of the difference in potential between the bulk fluid in which a particle is dispersed and the layer of fluid containing the oppositely charged ions that is associated with the nanoparticle surface. It does this by measuring the intensity of light scattered as a laser beam passes through a dispersed particulate sample. The Mastersizer 3000 uses the technique of laser diffraction to measure the particle size and particle size distribution of materials. A Doppler technique is used to measure the particle velocity as a function of voltage.
When a voltage is applied to the electrode, the particles will move toward the electrode with the opposite charge. Zeta potential is measured by adding a solution to a cell that contains two gold electrodes. In a similar way to Dynamic Light Scattering – the size theory – the particles in a sample are illuminated by a light source such as a laser, with the particles scattering the light in all directions.
#Zetasizer nano software series#
The Zetasizer Nano series performs molecular weight measurements using a process called Static Light Scattering (SLS). The principle of dynamic light scattering is that fine particles and molecules that are in constant random thermal motion, called Brownian motion, diffuse at a speed related to their size, smaller particles diffusing faster than larger particles. Zetasizer range Instruments in the Zetasizer family are used to measure the particle size of dispersed systems from sub-nanometer to several micrometers in diameter, using the technique of Dynamic Light Scattering (DLS). Samples may be measured at very low or high concentration using dynamic light scattering with ‘NIBS’ optics. The Zetasizer Nano ZS is a high performance two angle particle, zeta-potential, and molecular size analyzer for the enhanced detection of aggregates and small particles.
#Zetasizer nano software download#
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