The Effect of Nanoscale Roughness on Long Range Interaction Forces

摘要: A model was developed to calculate the long range van der Waals and electrostatic energies between a rough colloidal particle smooth solid plate in aqueous solutions. The roughness modeled as hemispherical asperities distributed uniformly over surface. Because of assumption additive potentials used calculating force, is most accurate when particle/plate separation larger than several Debye screening lengths, such near location secondary minimum. predicts that reduces depth minimum pushes it distances. also height primary energy barrier, which controls dispersion stability, substantially lowered by asperities.