Zeta Potential Analyzer

Nanoparticles or colloidal particles in solution usually acquire a charge due to the adsorption of surface functional groups or ions, forming a layer of ions around the particles.Electric Double LayerThe electric double layer can be divided into the one close to the particle surface.Stern Layerwith the outsideDiffuse Layer。

Within the diffuse layer there exists a hypothetical interface known as the Slipping PlaneThe position represents the boundary of relative motion between the particles in the solution and the surrounding liquid, and the potential on this plane is defined asZeta PotentialThe ions located inside the sliding plane move along with the particles, so the Zeta potential can reflect the particles in the solution.Actual surface electrical properties and dispersion behavior。

Zeta potential is influenced by various factors, including the particles'Surface chemical properties, solution pH value, types and concentrations of electrolytesTherefore, it is often used to evaluate colloidal systems or nanomaterials.Important indicators of dispersion stabilityGenerally speaking, the greater the absolute value of the Zeta potential, the stronger the electrostatic repulsive force between particles, and the higher the dispersion and stability of the system.

During the measurement process, the Zeta potential analyzer will apply to the sample.external electric fieldto generate charged particles in solutionElectrophoresis，the instrument usesLaser Doppler Velocimetry, LDVMeasure the particle's movement speed and calculate itsElectrophoretic Mobility,Finally, the electrophoretic mobility is converted using Henry's Equation.Zeta potential value。