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Zeta-potential or electrokinetic potential (ζ-potential)

The potential produced by the effective charge of a particle, measured at the boundary between what is moving in a solution with the particle and the rest of the solution; the electric potential across all phase boundaries between solids and liquids; in colloids, the zeta potential is the potential across the ionized layer around a charged colloidal particle which organizes water molecules in the liquid phase. Neutralizing this potential may cause a colloid to aggregate and precipitate, and so affects product stability.