A Plane Source Method for Measuring Interdiffusion Coefficients of Transparent Liquids

Abstract

A bottom layer diffusion technique is described, where an experiment is initiated by dropping a crystal of the diffusing substance to the bottom of a properly designed container for the liquid. It is shown that this technique is comparable to any other method from point of view of accuracy while the experimental procedure is extremely simple. The technique is tested at room temperature on two aqueous solutions with widely different diffusion coefficients. It is also applied to the determination of the interdiffusion coefficient of the silver ion in the three molten salts: sodium, potassium, and rubidium nitrate.