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- W2885677565 abstract "A colloidal dispersion in water is flocculated when the net interaction between particles is attractive. This occurs when the van der Waals force is stronger than the electrostatic repulsive force. The van der Waals force is constant at a given separation distance between particles and is strongest at the equilibrium separation distance in the flocculated state. The electrostatic force however may be varied from zero to a high value by surface potential control. pH is often used to manipulate the surface potential. The easily measurable zeta potential is normally used in place of the surface potential. This potential is measured at a shear plane near the particle surface and is proportional to the surface potential at constant ionic strength. There is a critical zeta potential where the electrostatic force is equal to the van der Waals force and the dispersion becomes dispersed. At fixed ionic strength the critical zeta potential is indirectly a measure of the strength of the van der Waals force in the flocculated state. Thus it is also a measure of the Hamaker constant, an important material property and parameter in the van der Waals equation. The critical zeta potential at fixed ionic strength of various oxide dispersions were compared. The yield stress and zeta potential data were used to determine the critical zeta potential at flocculated-dispersed state transition." @default.
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- W2885677565 date "2002-01-01" @default.
- W2885677565 modified "2023-09-23" @default.
- W2885677565 title "Critical zeta potential parameter for the characterization of the flocculated-dispersed state transition in colloidal dispersions" @default.
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