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Colloid diffusion in compacted bentonite: microstructural constraints
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Nuclear Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Nuclear Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Nuclear Chemistry.ORCID iD: 0000-0003-0663-0751
2010 (English)In: Clays and clay minerals, ISSN 0009-8604, E-ISSN 1552-8367, Vol. 58, no 4, 532-541 p.Article in journal (Refereed) Published
Abstract [en]

In Sweden and in many other countries, a bentonite barrier will be used in the repository for spent nuclear fuel. In the event of canister failure, colloidal diffusion is a potential, but scarcely studied mechanism of radionuclide migration through the bentonite barrier. Column and in situ experiments are vital in understanding colloid diffusion and in providing information about the microstructure of compacted bentonite and identifying cut-off limits for colloid filtration. This study examined diffusion of negatively charged 2-, 5-, and 15-nm gold colloids in 4-month diffusion experiments using MX-80 Wyoming bentonite compacted to dry densities of 0.6–2.0 g/cm3. Breakthrough of gold colloids was not observed in any of the three diffusion experiments. In a gold-concentration profile analysis, colloid diffusion was only observed for the smallest gold colloids at the lowest dry density used (estimated apparent diffusivity Da 5x10–13 m2/s). The results from a microstructure investigation using low-angle X-ray diffraction suggest that at the lowest dry density used, interlayer transport of the smallest colloids cannot be ruled out as a potential diffusion pathway, in addition to the expected interparticle transport. In all other cases, with either greater dry densities or larger gold colloids, compacted bentonite will effectively prevent diffusion of negatively charged colloids due to filtration.

Place, publisher, year, edition, pages
2010. Vol. 58, no 4, 532-541 p.
Keyword [en]
Colloid Filtration • Compacted Bentonite, Gold Colloids, Diffusion, Microstructure, Nuclear Waste Disposal
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-25247DOI: 10.1346/CCMN.2010.0580408ISI: 000289446500008Scopus ID: 2-s2.0-78149471771OAI: oai:DiVA.org:kth-25247DiVA: diva2:356746
Note
QC 20101013. Tidigare titel: "Colloid Permeability of Compacted Bentonite: Microstructural Constraints".Available from: 2010-10-13 Created: 2010-10-13 Last updated: 2017-12-12Bibliographically approved
In thesis
1. The bentonite barrier: microstructural aspects on colloid filtration and radiation effects on bentonite colloid stability
Open this publication in new window or tab >>The bentonite barrier: microstructural aspects on colloid filtration and radiation effects on bentonite colloid stability
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2009. 47 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2009:4
National Category
Other Basic Medicine
Identifiers
urn:nbn:se:kth:diva-10313 (URN)978-91-7415-234-0 (ISBN)
Presentation
2009-03-13, K1, Teknikringen 56, Stockholm, 10:00 (English)
Supervisors
Available from: 2009-05-07 Created: 2009-05-06 Last updated: 2010-10-14Bibliographically approved
2. The Bentonite Barrier: Microstructural properties and the influence of γ-radiation
Open this publication in new window or tab >>The Bentonite Barrier: Microstructural properties and the influence of γ-radiation
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. iv, 81 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2011:38
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:kth:diva-34048 (URN)978-91-7501-001-4 (ISBN)
Public defence
2011-06-15, F2, entréplan, Lindstedtsvägen 28, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20110608Available from: 2011-06-08 Created: 2011-05-24 Last updated: 2011-08-10Bibliographically approved

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