What is Zeta Potential?

1. The concept of Zeta potential

Zeta potential refers to the electric potential of charged particles (such as colloidal particles, emulsion droplets, etc.) in a dispersed system at the slipping plane. The slipping plane is the imaginary boundary between the liquid layer (fixed layer) adsorbed on the particle surface and the surrounding movable liquid. It reflects the interaction strength between the particle surface charge and the surrounding dispersion medium (such as liquid). It is a key parameter for characterizing colloidal stability and the behavior of dispersed systems 

2. The significance of measuring Zeta potential

The magnitude of the zeta potential indicates the stability of a colloidal system. The higher the absolute value of the zeta potential (typically > ±30 mV), the stronger the electrostatic repulsion between particles, the more stable the system, and less prone to aggregation or sedimentation. Conversely, if the zeta potential is close to zero (isoelectric point), the particles tend to agglomerate and the dispersion decreases.

Its value is affected by factors such as pH, ionic strength, and surface modification. It is commonly measured by electrophoresis. It is widely used in fields such as nanomaterials, biomedicine, and water treatment, and is a key parameter for assessing colloidal stability and interfacial behavior.

This time, Winner901 is recommended to test the zeta potential for customers. Winner901 is Photon Correlation DLS Nanoparticle Size and Zeta Potential Analyzer. Its measure range is 1-10000nm and -500mV—+500mV. It is used to measure key parameters such as Zeta potential and particle size distribution of nanoparticles in suspensions, emulsions, polymer solutions, etc.

Performance Advantage：

1. The optimized optical design makes the instrument highly anti-interference and the test results are accurate and stable.

2. The instrument has high sensitivity and signal-to-noise ratio, and is suitable for testing a wider range of samples.

3. High-precision semiconductor constant temperature control (accuracy up to 0.1°C) ensures high reproducibility of test results.

4.The system is designed to be easy to use and maintenance-free. The SOP standardized procedure operation and the complete medium viscosity database make the testing process simple and fast.