Numerical analysis of local electric field change using ion transport model in scanning vibrating electrode technique
Hayase Masanori; Fukuizumi Atsuhisa; Aoki Shigeru
Abstract:In the analysis of the scanning vibrating electrode technique (SVET), the electrolyte solution near the sample has been assumed to have uniform conductance for calculating the current density. In this study, however, it is found that the non uniformity due to electrolysis can not be neglected in a dilute solution. To describe the ion concentration and electric field change in the vicinity of sample surface, the Nernst Planck equation and electro neutral condition are employed. This model is verified with the experiment. A time dependent axi-symmetric problem is solved, and it is found that the applied electric voltage becomes 10 times smaller than the conventional solution to keep constant current. A comparison of the electric field change between this numerical analysis and the experimental result observed by SVET is made. Key Words:scanning vibrating electrode technique, Nernst-Plank equation, migration, diffusion, numerical analysis