Electric field analysis by scanning vibrating electrode technique in a dilute solution
Hayase Masanori; Fukuizumi Atsuhisa; Aoki Shigeru
Abstract:An electric field analysis of a dilute NaCl solution for Scanning Vibrating Electrode Technique (SVET) is performed by using a model which is based on a mathematical description of the physical mechanisms including ionic migration and diffusion. A cylindrical problem is solved using a finite difference method and Runge-Kutta method. The computational results show that the electric potential gradient decreases significantly with time. This phenomenon cannot be explained by the conductance change due to ion distribution. It is found that the ionic diffusion has an important role in it. The model is applied to a two dimensional problem, in which the specimen has two parallel electrode plates in a resin. It is also found that the potential gradient reduces to about one fifth of initial value or the result predicted by the conventional model with uniform electrolyte solution. A comparison between the results obtained by SVET and the computational results shows good agreement. Key Words:scanning vibrating electrode technique, dilute solution, Nernst-Plank equation, migration, diffusion, numerical analysis