Effects of the Counter Ion Valency on the Colloidal Interaction between Two Cylindrical Particles

다국어 초록 (Multilingual Abstract)

In this study, the effects of counter ion valency of the electrolyte on the colloidal repulsion between two parallel
cylindrical particles were investigated. Electrostatic interactions of the cylindrical particles were calculated with the
variation of counter ion valency. To calculate the electrical repulsive energy working between these two cylindrical
particles, Derjaguin approximation was applied. The electrostatic potential profiles were obtained numerically by
solving nonlinear Poission-Boltzmann (P-B) equation and calculating middle point potential and repulsive energy
working between interacting surfaces. The electrical potential and repulsive energy were influenced by counter ion
valency, Debye length, and surface potential. The potential profile and middle point potential decayed with the
counter ion valency due to the promoted shielding of electrical charge. On the while, the repulsive energy increased
with the counter ion valency at a short separation distance. These behaviors of electrostatic interaction agreed with
previous results on planar or spherical surfaces.

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