Cesium Diffusion through Angstrom-Scale Open Spaces in Clay Minerals

Saponite clay minerals possess the local molecular structures, where one and two nanosheets are inserted into interlayer spaces forming open spaces with their sizes of ~3 and ~9 Å, respectively. Here, Cs diffusion via the above-mentioned open spaces is highlighted based on the results of open space...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Physical Society of Japan 2017-03, Vol.86 (3), p.1-1
Main Authors: Miyao, Satoaki, Morishita, Naoki, Sunnardianto, Gagus Ketut, Kusakabe, Koichi
Format: Article
Language:English
Subjects:
Chemical elements
Clay
Clay minerals
Diffusion
Diffusion coefficient
Interlayers
Minerals
Nanostructure
Open spaces
Positronium
Saponite
Spectrum analysis
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Saponite clay minerals possess the local molecular structures, where one and two nanosheets are inserted into interlayer spaces forming open spaces with their sizes of ~3 and ~9 Å, respectively. Here, Cs diffusion via the above-mentioned open spaces is highlighted based on the results of open space analysis using positronium (Ps) lifetime spectroscopy coupled with a conventional diffusion experiment. A population of Cs is found to significantly migrate in the saponite clay yielding a diffusion coefficient of ~2.0 x 10^sup -7^ cm^sup 2^ s^sup -1^ with an application of Fick's second law, which arises from overall diffusion contributed from open spaces with a variety of sizes. On the other hand, the diffusion coefficient solely attributable to the angstrom-scale open space is ~2.5 x 10^sup -8^ cm^sup 2^ s^sup -1^, which amounts to more than ~10% than that of overall diffusion.
ISSN:0031-9015
1347-4073