The difference in electric potential between the actual or true surface of the particle and the electroneutral region is referred to as the surface or electrothermo-dynamic or Nernst potential (E). Hence, Nernst potential is controlled by the electrical potential at the surface of the particle due to the potential determining ions. The potential difference between the shear plane and the electroneutral region is known as the electrokinetic or zeta (z) potential (Fig. 2.3). While Nernst potential has little influence in the formulation of stable suspension, zeta potential has significant effect on it (Brigger et al. 2003). Zeta potential governs the degree of repulsion between adjacent, similarly charged solid dispersed particles. If the zeta potential is reduced below a certain value, which depends on the specific Zeta potential governs the degree of repulsion between adjacent, similarly charged solid dispersed particles.
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