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Publications (10 of 159) Show all publications
Chen, S., Abdel-Magied, A. F., Fu, L., Jonsson, M. & Forsberg, K. (2019). Incorporation of strontium and europium in crystals of α-calcium isosaccharinate. Journal of Hazardous Materials, 364, 309-316
Open this publication in new window or tab >>Incorporation of strontium and europium in crystals of α-calcium isosaccharinate
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2019 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 364, p. 309-316Article in journal (Refereed) Published
Abstract [en]

The final repository for short-lived, low and intermediate level radioactive waste in Sweden is built to act as a passive repository. Already within a few years after closure water will penetrate the repository and conditions of high alkalinity (pH 10.5―13.5) and low temperature (< 7 °C) will prevail. The mobility of radionuclides in the repository is dependent on the radionuclides distribution between solid and liquid phases. In the present work the incorporation of strontium (II) and europium (III) in α-calcium isosaccharinate (ISA) under alkaline conditions (pH ~10) at 5 °C and 50 °C have been studied. The results show that strontium and europium are incorporated into α-Ca(ISA)2 when crystallized both at 5 °C and 50 °C. Europium is incorporated to a greater extent than strontium. The highest incorporation of europium and strontium at 5 °C rendered the phase compositions Ca0.986Eu0.014(ISA)2 (2.4% of Eu(ISA)3 by mass) and Ca0.98Sr0.02(ISA)2 (2.2% of Sr(ISA)2 by mass). XPS spectra show that both trivalent and divalent Eu coexist in the Eu incorporated samples. Strontium ions were found to retard the elongated growth of the Ca(ISA)2crystals. The incorporation of Sr2+ and Eu3+ into the solid phase of Ca(ISA)2 is expected to contribute to a decreased mobility of these ions in the repository.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Mobility, radionuclides, isosaccharinate, precipitation
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-235920 (URN)10.1016/j.jhazmat.2018.10.001 (DOI)000452926500034 ()30384240 (PubMedID)2-s2.0-85055549831 (Scopus ID)
Funder
Swedish Radiation Safety Authority, SSM2016-2126
Note

QC 20181010

Available from: 2018-10-08 Created: 2018-10-08 Last updated: 2019-01-07Bibliographically approved
Barreiro Fidalgo, A. & Jonsson, M. (2019). Radiation induced dissolution of (U, Gd)O-2 pellets in aqueous solution - A comparison to standard UO2 pellets. Journal of Nuclear Materials, 514, 216-223
Open this publication in new window or tab >>Radiation induced dissolution of (U, Gd)O-2 pellets in aqueous solution - A comparison to standard UO2 pellets
2019 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 514, p. 216-223Article in journal (Refereed) Published
Abstract [en]

The behavior of spent nuclear fuel exposed to groundwater is crucial in the safety assessment of a deep geological repository for spent nuclear fuel. For this reason, leaching experiments on spent nuclear fuel as well as non-radioactive analogues have been conducted for several decades. Although the processes involved can be considered to be fairly well understood, there is a need for further experimental studies whenever new fuel types are introduced. Fuels with burnable absorbers are now in use but very little is known about their behavior under repository conditions. In this work, the impact of burnable absorbers doping (Gd, 3-8%wt.) on the oxidative dissolution of UO2 in an aqueous system was studied in H2O2 and gamma-irradiation induced dissolution experiments. The results showed a significant decrease in uranium dissolution and lower reactivity towards H2O2 for (U,Gd)O-2 pellets compared to standard UO2. The resulting decrease in the final oxidative dissolution yield was mainly attributed to decreased redox reactivity of the UO2-matrix upon doping. The results of the gamma radiation exposures display an even larger effect of Gd-doping. These findings indicate that other processes are involved in the radiation-induced dissolution of Gd-doped UO2 compared to pure UO2. 

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2019
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-241303 (URN)10.1016/j.jnucmat.2018.11.037 (DOI)000454829000025 ()2-s2.0-85057718007 (Scopus ID)
Note

QC 20190125

Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved
Chernyshev, A. N., Jonsson, M. & Forsberg, K. (2018). Characterization and degradation of a polyaryl ether based superplasticizer for use in concrete barriers in deep geological repositories. Applied Geochemistry, 95, 172-181
Open this publication in new window or tab >>Characterization and degradation of a polyaryl ether based superplasticizer for use in concrete barriers in deep geological repositories
2018 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 95, p. 172-181Article in journal (Refereed) Published
Abstract [en]

Superplasticizers are important additives used in concrete barriers in geological waste repositories. Superplasticizers have been a major concern in the long-term assessments of safe geological disposal for radioactive waste since superplasticizers and their degradation products can act as complexing ligands and thereby increase the mobility of radionuclides. In this work a new type of superplasticizer, based on a polyaryl ether polymer, has been characterized. It was found that the superplasticizer combines the structural features of polycarboxylate ether based superplasticizers and sulfonated naphthalene-formaldehyde based superplasticizers and that it contains organophosphatecharged groups. A novel method for evaluating the rate of degradation of the superplasticizer under alkaline conditions was elaborated and the degradation products and rate constant of the process was determined. The results demonstrate that degradation occurs rapidly compared to the typical lifetime of a repository.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Waste disposal; Alkaline degradation; Polyaryl ether based superplasticizer
National Category
Chemical Engineering Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-228236 (URN)10.1016/j.apgeochem.2018.05.014 (DOI)000437294900015 ()2-s2.0-85048180279 (Scopus ID)
Funder
Swedish Nuclear Fuel and Waste Management Company, SKB
Note

QC 20180611

Available from: 2018-05-20 Created: 2018-05-20 Last updated: 2018-11-28Bibliographically approved
Li, Z., Soroka, I., Min, F. & Jonsson, M. (2018). pH-Control as a way to fine-tune the Cu/Cu2O ratio in radiation induced synthesis of Cu2O particles. Dalton Transactions, 47(45), 16139-16144
Open this publication in new window or tab >>pH-Control as a way to fine-tune the Cu/Cu2O ratio in radiation induced synthesis of Cu2O particles
2018 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 47, no 45, p. 16139-16144Article in journal (Refereed) Published
Abstract [en]

In this work we have optimized the -radiation induced synthesis of Cu-Cu2O particles from aqueous CuSO4 solution by investigating the effect of pH. The obtained precipitate was analyzed by XRD and SEM techniques. The results indicated that at solution pH lower than 3.75, quasi-spherical Cu agglomerates can be formed while at pH higher than 4.40 only octahedron-shaped Cu2O particles are produced. At solution pH in the range from 3.75 to 4.40, a Cu-Cu2O mixture is produced. It was found that the relative amount of Cu2O in the Cu-Cu2O precipitate increases with pH in the studied range. The influence of solution pH on the Cu/Cu2O ratios in the product can be explained on the basis of pH-dependent competition kinetics between the reactions leading to either Cu or Cu2O formation. As a consequence, the composition and morphology of the Cu-Cu2O precipitate can be tuned by controlling pH of the aqueous CuSO4 solution during the -radiation induced synthesis.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2018
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-240347 (URN)10.1039/c8dt02916d (DOI)000451018400017 ()30378612 (PubMedID)2-s2.0-85056968525 (Scopus ID)
Note

QC 20181217

Available from: 2018-12-17 Created: 2018-12-17 Last updated: 2018-12-17Bibliographically approved
Seashore-Ludlow, B., Axelsson, H., Almqvist, H., Dahlgren, B., Jonsson, M. & Lundback, T. (2018). Quantitative Interpretation of Intracellular Drug Binding and Kinetics Using the Cellular Thermal Shift Assay. Biochemistry, 57(48), 6715-6725
Open this publication in new window or tab >>Quantitative Interpretation of Intracellular Drug Binding and Kinetics Using the Cellular Thermal Shift Assay
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2018 (English)In: Biochemistry, ISSN 0006-2960, E-ISSN 1520-4995, Vol. 57, no 48, p. 6715-6725Article in journal (Refereed) Published
Abstract [en]

Evidence of physical interaction with the target protein is essential in the development of chemical probes and drugs. The cellular thermal shift assay (CETSA) allows evaluation of drug binding in live cells but lacks a framework to support quantitative interpretations and comparisons with functional data. We outline an experimental platform for such analysis using human kinase p38 alpha. Systematic variations to the assay's characteristic heat challenge demonstrate an apparent loss of compound potency with an increase in duration or temperature, in line with expectations from the literature for thermal shift assays. Importantly, data for five structurally diverse inhibitors can be quantitatively explained using a simple model of linked equilibria and published binding parameters. The platform further distinguishes between ligand mechanisms and allows for quantitative comparisons of drug binding affinities and kinetics in live cells and lysates. We believe this work has broad implications in the appropriate use of the CETSA for target and compound validation.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:kth:diva-240736 (URN)10.1021/acs.biochem.8b01057 (DOI)000452693000009 ()30418016 (PubMedID)2-s2.0-85057521293 (Scopus ID)
Funder
Swedish Research CouncilScience for Life Laboratory - a national resource center for high-throughput molecular bioscience
Note

QC 20190108

Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-01-08Bibliographically approved
Norrfors, K. K., Björkbacka, Å., Kessler, A., Wold, S. & Jonsson, M. (2018). γ-radiation induced corrosion of copper in bentonite-water systems under anaerobic conditions. Radiation Physics and Chemistry, 144, 8-12
Open this publication in new window or tab >>γ-radiation induced corrosion of copper in bentonite-water systems under anaerobic conditions
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2018 (English)In: Radiation Physics and Chemistry, ISSN 0969-806X, E-ISSN 1879-0895, Vol. 144, p. 8-12Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
Keywords
Aluminum compounds, Anoxic sediments, Copper, Copper corrosion, Corrosion, Irradiation, Positive ions, Radiation, Adsorption capacities, Anaerobic conditions, Compacted bentonite, Corrosion mechanisms, Deep geological repository, Protective effects, Sorption capacities, Spent nuclear fuels, Bentonite, hydroxyl radical, nuclear fuel, adsorption kinetics, anaerobic capacity, Article, embedding, environmental impact assessment, gamma radiation, water supply
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-223137 (URN)10.1016/j.radphyschem.2017.11.004 (DOI)000423646400002 ()2-s2.0-85034661878 (Scopus ID)
Funder
Swedish Nuclear Fuel and Waste Management Company, SKB
Note

Export Date: 13 February 2018; Article; CODEN: RPCHD; Correspondence Address: Jonsson, M.; School of Chemical Science and Engineering, Applied Physical Chemistry, KTH Royal Institute of TechnologySweden; email: matsj@kth.se; Funding details: SKB, Svensk Kärnbränslehantering. QC 20180326

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-03-26Bibliographically approved
Yang, M., Soroka, I. & Jonsson, M. (2017). Exploring the limitations of the Hantzsch method used for quantification of hydroxyl radicals in systems of relevance for interfacial radiation chemistry. Radiation Physics and Chemistry, 130, 1-4
Open this publication in new window or tab >>Exploring the limitations of the Hantzsch method used for quantification of hydroxyl radicals in systems of relevance for interfacial radiation chemistry
2017 (English)In: Radiation Physics and Chemistry, ISSN 0969-806X, E-ISSN 1879-0895, Vol. 130, p. 1-4Article in journal (Refereed) Published
Abstract [en]

In the presence of Tris or methanol, hydroxyl radicals in systems of relevance for interfacial radiation chemistry can be quantified indirectly via the Hantzsch method by determining the amount of the scavenging product formaldehyde formed. In this work, the influence of the presence of H2O2 on the Hantzsch method using acetoacetanilide (AAA) as derivatization reagent is studied. The experiments show that the measured CH2O concentration deviates from the actual concentration in the presence of H2O2 and the deviation increases with increasing [H2O2]0/[CH2O]0. The deviation is negative, i.e., the measured formaldehyde concentration is lower than the actual concentration. This leads to an underestimation of the hydroxyl radical production in systems containing significant amount of H2O2. The main reason for the deviation is found to be three coupled equilibria involving H2O2, CH2O and the derivative produced in the Hantzsch method.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Acetoacetanilide, Formaldehyde, Hantzsch method, Hydrogen peroxide, Hydroxyl radical, Derivatization reagent, Formaldehyde concentrations, Hantzsch, Hydroxyl radicals, Radiation chemistry, acetanilide derivative, unclassified drug, Article, chemical analysis, chemical reaction kinetics, concentration (parameters), controlled study, interfacial radiation chemistry, quantitative analysis, radiochemistry
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-195129 (URN)10.1016/j.radphyschem.2016.07.021 (DOI)000388777200001 ()2-s2.0-84979622715 (Scopus ID)
Note

QC 20161121

Available from: 2016-11-21 Created: 2016-11-02 Last updated: 2017-11-29Bibliographically approved
Nilsson, K., Roth, O. & Jonsson, M. (2017). Oxidative dissolution of ADOPT compared to standard UO2 fuel. Journal of Nuclear Materials, 488, 123-128
Open this publication in new window or tab >>Oxidative dissolution of ADOPT compared to standard UO2 fuel
2017 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 488, p. 123-128Article in journal (Refereed) Published
Abstract [en]

In this work we have studied oxidative dissolution of pure UO2 and ADOPT (UO2 doped with Al and Cr) pellets using H2O2 and gammaradiolysis to induce the process. There is a small but significant difference in the oxidative dissolution rate of UO2 and ADOPT pellets, respectively. However, the difference in oxidative dissolution yield is insignificant. Leaching experiments were also performed on in-reactor irradiated ADOPT and UO2 pellets under oxidizing conditions. The results indicate that the U(VI) release is slightly slower from the ADOPT pellet compared to the UO2. This could be attributed to differences in exposed surface area. However, fission products with low UO2 solubility display a higher relative release from ADOPT fuel compared to standard UO2-fuel. This is attributed to a lower matrix solubility imposed by the dopants in ADOPT fuel. The release of Cs is higher from UO2 which is attributed to the larger grain size of ADOPT. © 2017 Elsevier B.V.

Place, publisher, year, edition, pages
Elsevier B.V., 2017
Keywords
Doping (additives), Fission products, Fuels, Pelletizing, Solubility, Exposed surfaces, Grain size, Leaching experiments, Matrix solubility, Oxidative dissolution, Oxidizing conditions, Dissolution
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-207344 (URN)10.1016/j.jnucmat.2017.02.044 (DOI)000400218100012 ()2-s2.0-85015707126 (Scopus ID)
Note

QC 20170522

Available from: 2017-05-22 Created: 2017-05-22 Last updated: 2017-05-23Bibliographically approved
Lousada, C. M., Soroka, I. L., Yagodzinskyy, Y., Tarakina, N. V., Todoshchenko, O., Hänninen, H., . . . Jonsson, M. (2016). Gamma radiation induces hydrogen absorption by copper in water. Scientific Reports, 6, Article ID 24234.
Open this publication in new window or tab >>Gamma radiation induces hydrogen absorption by copper in water
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2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, article id 24234Article in journal (Refereed) Published
Abstract [en]

One of the most intricate issues of nuclear power is the long-term safety of repositories for radioactive waste. These repositories can have an impact on future generations for a period of time orders of magnitude longer than any known civilization. Several countries have considered copper as an outer corrosion barrier for canisters containing spent nuclear fuel. Among the many processes that must be considered in the safety assessments, radiation induced processes constitute a key-component. Here we show that copper metal immersed in water uptakes considerable amounts of hydrogen when exposed to γ-radiation. Additionally we show that the amount of hydrogen absorbed by copper depends on the total dose of radiation. At a dose of 69 kGy the uptake of hydrogen by metallic copper is 7 orders of magnitude higher than when the absorption is driven by H2(g) at a pressure of 1 atm in a non-irradiated dry system. Moreover, irradiation of copper in water causes corrosion of the metal and the formation of a variety of surface cavities, nanoparticle deposits, and islands of needle-shaped crystals. Hence, radiation enhanced uptake of hydrogen by spent nuclear fuel encapsulating materials should be taken into account in the safety assessments of nuclear waste repositories.

Place, publisher, year, edition, pages
Nature Publishing Group, 2016
National Category
Manufacturing, Surface and Joining Technology Physical Sciences
Identifiers
urn:nbn:se:kth:diva-187004 (URN)10.1038/srep24234 (DOI)000374226400001 ()2-s2.0-84964306889 (Scopus ID)
Note

QC 20160523

Available from: 2016-05-23 Created: 2016-05-16 Last updated: 2017-11-30Bibliographically approved
Dispenza, C., Sabatino, M. A., Grimaldi, N., Mangione, M. R., Walo, M., Murugan, E. & Jonsson, M. (2016). On the origin of functionalization in one-pot radiation synthesis of nanogels from aqueous polymer solutions. RSC Advances, 6(4), 2582-2591
Open this publication in new window or tab >>On the origin of functionalization in one-pot radiation synthesis of nanogels from aqueous polymer solutions
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2016 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 6, no 4, p. 2582-2591Article in journal (Refereed) Published
Abstract [en]

Radiation-engineered poly(N-vinyl pyrrolidone) nanogels are very interesting biocompatible nanocarriers for i.v. administration of therapeutics and contrast agents for bioimaging. The manufacturing process is fast and effective, it grants excellent control of particle size and simultaneous sterilization of the formed nanogels. Interestingly, primary amino groups and carboxyl groups, useful for (bio) conjugation, are also formed in a dose-dependent fashion. In this paper, by means of both numerical simulations and experiments, the origin of nanogel size control and functionalization is investigated. This understanding offers a new dimension for the design and production of radiation-sculptured multifunctional nanocarriers from aqueous solutions of polymers.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-182875 (URN)10.1039/c5ra23926e (DOI)000368193500008 ()2-s2.0-84954058310 (Scopus ID)
Note

QC 20160224

Available from: 2016-02-24 Created: 2016-02-23 Last updated: 2017-11-30Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-0663-0751

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