The theory of non-Cottrellian diffusion on the surface of a sphere or truncated sphere

A method is developed whereby spherical and other particles can be derivatized with electroactive species on their surface and then immobilized on the surface of an electrode. The chronoamperometric and voltammetric responses in the limit of reversible electrode kinetics are modeled using a theory of charge movement over the surface of the spheres where this movement is considered as a diffusional process. The model is extended to include different distributions of sphere radii and to model the scenario of truncated spheres resting on the electrode surface. A good estn. of the truncation angle can be found by fitting the exptl. data with theor. predictions. [on SciFinder(R)]