The charge on the surface of a part

The charge on the surface of a particle influences the ionic environment in the region close to the particle surface. This ionic environment is typically described using a double layer model – the Stern layer of ions firmly attached adjacent to the particle surface, and the diffuse layer further away from the particle surface, but still attracted to the particle such that these ions will move with the particle. The boundary between the electric double layer and the ions in equilibrium in the solution is called the slipping plane, as shown in Figure 27. Zeta potential is defined as the potential measured in mV at the slipping plane distance from the particle surface.