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Sökning: WFRF:(Norrfors K. Karin)

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1.
  • Henry, Christophe, et al. (författare)
  • A refined algorithm to simulate latex colloid agglomeration at high ionic strength
  • 2016
  • Ingår i: Adsorption. - : Springer Netherlands. - 0929-5607 .- 1572-8757. ; 22:4-6, s. 503-515
  • Tidskriftsartikel (refereegranskat)abstract
    • This study is focussed on the simulation of particle agglomeration at relatively high ionic strength using a refined stochastic algorithm developed in the context of parcel-tracking approaches. For that purpose, experimental data of both diffusion-limited and reaction-limited aggregation of latex particles were obtained using dynamic light scattering techniques for different initial particle sizes (diameters ranging from 24 to 495 nm) and at various chemical conditions (ionic strength between 0.5 and 2 M with NaCl or CaCl2 solutions). The experimental data collected have been compared to numerical results obtained with the refined parcel-tracking algorithm for particle agglomeration which has been developed. Results show that the evolution of the aggregate diameters over time can be properly captured by the present model with the value of the aggregate fractal dimension that is extracted from experimental data.
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2.
  • Norrfors, K. Karin, et al. (författare)
  • γ-radiation induced corrosion of copper in bentonite-water systems under anaerobic conditions
  • 2018
  • Ingår i: Radiation Physics and Chemistry. - : Elsevier Ltd. - 0969-806X .- 1879-0895. ; 144, s. 8-12
  • Tidskriftsartikel (refereegranskat)abstract
    • In this work we have experimentally studied the impact of bentonite clay on the process of radiation-induced copper corrosion in anoxic water. The motivation for this is to further develop our understanding of radiation-driven processes occurring in deep geological repositories for spent nuclear fuel where copper canisters containing the spent nuclear fuel will be embedded in compacted bentonite. Experiments on radiation-induced corrosion in the presence and absence of bentonite were performed along with experiments elucidating the impact irradiation on the Cu2+ adsorption capacity of bentonite. The experiments presented in this work show that the presence of bentonite clay has no or very little effect on the magnitude of radiation-induced corrosion of copper in anoxic aqueous systems. The absence of a protective effect similar to that observed for radiation-induced dissolution of UO2 is attributed to differences in the corrosion mechanism. This provides further support for the previously proposed mechanism where the hydroxyl radical is the key radiolytic oxidant responsible for the corrosion of copper. The radiation effect on the bentonite sorption capacity of Cu2+ (reduced capacity) is in line with what has previously been reported for other cations. The reduced cation sorption capacity is partly attributed to a loss of Al-OH sites upon irradiation.
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