Numerical Analysis of Electrical Interaction between two Axisymmetric Spheroids

The electrical interaction between two axisymmetric spheroidal particles in an electrolyte solution is examined numerically. A Galerkin finite element method combined with a Newton-Raphson iteration scheme is proposed to evaluate the spatial variation in the electrical potential, and the result obtained used to estimate the interaction energy between two particles. We show that if the surface charge density is fixed, the potential gradient is larger at a point, which has a larger curvature, and if surface potential is fixed, surface charge density is proportional to the curvature. Also, if the total interaction energy against closest surface-to-surface curve exhibits a primary maximum, the maximum follows the order (oblate-oblate) > (sphere-sphere)>(oblate-prolate)>(prolate-prolate), and if the curve has a secondary minimum, the absolute value of the minimum follows the same order.

Authors:

• Kuan-Liang Liu
• Eric Lee
• Jung-Jyh Lee
• Jyh-Ping Hsu

Keywords:

• interaction energy
• interaction force
• Poisson-Boltzmann equation
• spheroid.

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