Related Experiment Video
Updated: Jun 19, 2026

Real-time Iontophoresis with Tetramethylammonium to Quantify Volume Fraction and Tortuosity of Brain Extracellular Space
Published on: July 24, 2017
STUDIES ON THE DIFFUSION EFFECT UPON IONIC DISTRIBUTION : II. EXPERIMENTS ON IONIC ACCUMULATION
1Laboratories of The Rockefeller Institute for Medical Research, New York, and the Department of Medical Chemistry, University of Upsala, Upsala, Sweden.
Abstract:
The aim of this paper is to present confirmation of the theory of the diffusion effect. By diffusion effect is understood a redistribution of the ions in a system where a continuous diffusion of one electrolyte is going on, which results in a steady state showing accumulation and impoverishment of certain ions. Some typical experiments are recorded and discussed. The results are found in satisfactory agreement with the theory: this can be demonstrated in several ways. The importance of considering activity changes is pointed out. Water migration and the diffusion membrane probably have no appreciable influence upon the diffusion effect under the conditions of these experiments. The diffusion effect may have biological analogies.
Related Concept Videos
Ionic Strength: Effects on Chemical Equilibria
In this solution, the primary cation—the calcium...
Transport Number
Ion Exchange
Common Ion Effect
Diffusion
Diffusion

