Microelectrodes diffusion field, development

Note that the current density in this case is larger by a factor of (L/r) than at short times, when Eq. 44L applies. The development of the diffusion field at an ensemble of microelectrodes is shown schematically in Fig. 20L. 

Similarly, it was shown by Gilleadi16 that the development of a diffusion field near the surface of an ensemble of microelectrodes occurs in the four successive steps, assuming total diffusion control of the process. The ensemble of microelectrodes consists of microelectrodes placed on the inert surface at distances between their centers larger than their diameter. The first, planar diffusion to the microelectrodes the second, spherical diffusion with no overlap the third, spherical diffusion with substantial overlap and finally, total overlap, equivalent to planar diffusion to the whole surface. 

The development of the diffusion field at an ensemble of microelectrodes is shown schematically in Figure 14.12. 

Figure 14.12 Development of the diffusion field near the surface of an ensemble of microelectrodes, (a) semi-infinite linear diffusion (b) spherical diffusion with no...

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