Diffusion of Cesium Ions Labeled with 134 Cs in Agar Gel Containing Alkali Metal Iodides: Obstruction Effect and Activation Energy

摘要

The effect of some alkali metal iodides on the obstruction effect and activation energy for tracer-diffusion of cesium ions in an agar gel medium was studied using the zone-diffusion technique. It to be observed that both the extent of obstruction (α) and the activation energy (E) decrease with the increasing charge density of the cation of the supporting electrolyte. These trends are explained on the basis of competitive hydration between ions and agar molecules and the relative distortion in the water structure that is brought about by these different ions and agar molecules, respectively.