A Model for Calculating Electrostatic Interactions between Colloidal Particles of Arbitrary Surface Topology

A numerical model for calculating the electrostatic interaction between two particles of arbitrary shape and topology is described

Ning Sun

2002

Scholarcy highlights

  • A numerical model for calculating the electrostatic interaction between two particles of arbitrary shape and topology is described
  • Example interaction energy profiles are calculated for three different types of roughness—bumps, pits, and surface waves
  • It is found that the interaction energy between rough particles remains different from that between two equivalent smooth spheres at all separations, even for gap widths much larger than either the solution Debye length or the characteristic roughness size
  • This behavior at large gap widths arises from the nature of the decay of the electric potential away from each particle
  • For a sphere containing asperities of height equal to 0.2 times the particle radius, the interaction energy can be as much as 50% greater than that between two equivalent spheres under the condition of constant surface potential
  • Changes of this magnitude could clearly have a substantial impact on the stability behavior of a dispersion of such particles

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