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Updated: Jul 8, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Published on: August 2, 2012

Modeling cation diffusion in compacted water-saturated sodium bentonite at low ionic strength.

Ian C Bourg¹, Garrison Sposito, Alain C M Bourg

¹Civil and Environmental Engineering, University of California, Berkeley, California 94720-1710, USA. ibourg@nature.berkeley.edu

Environmental Science & Technology

|January 12, 2008

Summary

The macropore/nanopore model accurately predicts cation diffusion in sodium bentonite barriers across various densities. The surface diffusion model fails at higher densities, highlighting the importance of pore structure in radioactive waste isolation.

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Area of Science:

Geochemistry
Materials Science
Environmental Engineering

Background:

Sodium bentonites are crucial for landfill isolation and considered for radioactive waste disposal.
Bentonite barrier performance relies heavily on molecular diffusion within its pore spaces.

Purpose of the Study:

To evaluate the efficacy of two cation diffusion models in bentonite.
To compare the macropore/nanopore model against the surface diffusion model using experimental data.

Main Methods:

Experimental testing of sodium and strontium cation diffusion in bentonite.
Comparison of model predictions with experimental data across a range of montmorillonite dry densities.

Main Results:

The macropore/nanopore model demonstrated agreement with experimental data from 0.2 to 1.7 kg dm(-3) dry densities.
The surface diffusion model showed discrepancies at dry densities exceeding 1.3 kg dm(-3).

Conclusions:

The macropore/nanopore model provides a more reliable framework for predicting cation diffusion in bentonite barriers.
Accurate modeling of diffusion is critical for the long-term safety of radioactive waste repositories.