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Effects of gamma-irradiation on the stability of colloidal Na+-Montmorillonite dispersions
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
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Nuclear Chemistry.
2009 (English)In: Applied Clay Science, ISSN 0169-1317, E-ISSN 1872-9053, Vol. 43, no 1, 86-90 p.Article in journal (Refereed) Published
Abstract [en]

In many concepts for final storage of spent nuclear fuel bentonite will be used as an engineered barrier, mainly due to its inertness, plasticity and ability to retard transport of radionuclides by adsorption. In the event of water-bearing fractures making contact with the bentonite barrier, generation and transport of colloidal particles will strongly depend on groundwater composition and the surface properties of the colloidal particles. The bentonite barrier will unavoidably be exposed to ionizing radiation from the spent nuclear fuel but very little is known about effects of ionizing radiation on bentonite concerning colloidal stability. In this work we have studied the effect of gamma-radiation on the stability of dilute colloidal Na+-montmorillonite dispersions using a Cs-137 gamma-source (doses of 0-53.2 kGy). Aggregation kinetics and sedimentation experiments revealed significant radiation effects, evident as increased colloid stability. The only rationale for this is a gamma-radiation induced increase in surface potential. The effects appeared to depend on the Na+-montmorillonite concentration in the irradiated dispersions, indicating that the change in surface potential is induced by aqueous radiolysis products.

Place, publisher, year, edition, pages
2009. Vol. 43, no 1, 86-90 p.
Keyword [en]
Radiation effects, gamma-radiation, Montmorillonite, Colloid stability, Bentonite
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-18118DOI: 10.1016/j.clay.2008.07.004ISI: 000262658000013Scopus ID: 2-s2.0-57649085839OAI: oai:DiVA.org:kth-18118DiVA: diva2:336164
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-06-08Bibliographically 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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