Dr. Rainer Dähn

Scientist

Paul Scherrer Institute
Forschungsstrasse 111
5232 Villigen PSI
Switzerland




  • Determination of uptake mechanisms of metal ions onto clay and cementitious materials using X-ray absorption spectroscopy (XAS)
  • Synchrotron-based micro-spectroscopic investigations (micro-XRF/XAS/XRD) of the influence of the heterogeneity of waste repository materials on the uptake mechanisms of heavy metals
  • Application of scanning transmission X-ray microscopy (STXM) to study materials relevant for radioactive waste management
1988 - 1993 Diplom-Physiker (Dipl.-Phys.)
DESY and University of Hamburg, Germany Thesis-advisor: Prof. G. Materlik Investigation of the LMM Augerdecay of 4d-Metals with high energy resolution. (in German)

1998 - 2001 Dr. rer. nat.
Department of Environmental Sciences, Swiss Federal Institute of Technology Zürich (ETHZ), Switzerland Thesis advisors: Prof. B. Wehrli, Prof. A. Manceau and PD Dr. A. Scheidegger Determination of Ni(II) and Th(IV) Sorption Mechanisms on Clay Mineral Surfaces: A Combined Macroscopic, Spectroscopic, and Microscopic Approach
2001 - present Scientist (Since 2003: Project leader of the "XAS" programme), Laboratory for Waste Management, Nuclear Energy and Safety Research Division, Paul Scherrer Institut, Villigen, Switzerland

1st June 2006 - 31st December 2006 Visiting research scientist, Glenn T. Seaborg Center, Actinide Chemistry Group, Lawrence Berkeley National Laboratory, Berkeley, United States

1997 - 1998 Research scientist, “AD Elektronik”, Wetzlar, German

1995 - 1996 Beamline scientist, “Swiss- Norwegian Beamlines” (SNBL) at the “European Synchrotron Facility” (ESRF), Grenoble, France

1994 - 1995 Research scientist, “Hamburger Synchrotronstrahlungslabor” at the Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany.
Books, book chapters

Wieland, E.; Dähn, R.; Gaona, X.; Macé, N.; Tits, J. Micro- and macroscopic investigations of actinide binding in cementitious materials. In: Cement-Based Materials for Nuclear Waste Storage; Bart, F., Cau-di-Coumes, C., Frizon, F., Lorente, S., Eds.; Springer, ISBN 978-1-4614-3444-3, 2013.

Peer-reviewed journal articles

Dähn R., Arakcheeva A., Schaub P., Pattison P., Chapuis G., Grolimund D, Wieland E., Leemann A., (2016) Application of micro X-ray diffraction to investigate the reaction products formed by the alkali-silica reaction in concrete structures. Cement and Concrete Research 79, 49-56.

Kéri A., Osán J., Fábián M., Dähn R. and Török S., (2016) Combined X-ray microanalytical study of the Nd uptake capability of argillaceous rocks. X-Ray Spectrometry 45, 54-62

Vespa M., Wieland E., Dähn R., Lothenbach B., (2015) Identification of the thermodynamically stable Fe-containing phase in aged cement pastes. Journal of the American Ceramic Society 98, 2286-2294.

Breitner D., Osán J., Fábián M., Zagyvai P., Szabó C., Dähn R., Marques M. F., Sajó I. E., Máthé Z., and Török S. (2015) Characteristics of uranium uptake of Boda Claystone Formation as the candidate host rock of high level radioactive waste repository in Hungary. Environmental Earth Sciences 73, 209-219.

Dähn R., Popov D., Schaub P., Pattison P., Grolimund D., Mäder U., Jenni A., and Wieland E. (2014) X-ray micro-diffraction studies of heterogeneous interfaces between cementitious materials and geological formations. Physics and Chemistry of the Earth, 70-71, 96-103. Link

Dilnesa, B. Z.; Wieland, E.; Lothenbach, B.; Dähn, R.; Scrivener, K. L. (2014) Fe-containing phases in hydrated cements. Cement and Concrete Research, 58, 45-55.

Osán J., Kéri A., Breitner D., Fábián M., Dähn R., Simon R., and Török S. (2014) Microscale analysis of metal uptake by argillaceous rocks using positive matrix factorization of microscopic X-ray fluorescence elemental maps. Spectrochimica Acta Part B: Atomic Spectroscopy 91, 12-23. Link

Soltermann D., Marques M. F., Baeyens B., Brendlé J. M., and Dähn R. (2014) Competitive Fe(II)–Zn(II) uptake on a synthetic montmorillonite. Environmental Science & Technology 48(1), 190-198. Link

Vespa M., Dähn R., and Wieland E. (2014) Competition behaviour of metal uptake in cementitious systems: An XRD and EXAFS investigation of Nd- and Zn-loaded 11 Å tobermorite. Physics and Chemistry of the Earth in press. Link

Gaona X., Wieland E., Tits J., Scheinost A. C., and Dähn R. (2013) Np(V/VI) redox chemistry in cementitious systems: XAFS investigations on the speciation under anoxic and oxidizing conditions. Applied Geochemistry 28, 109-118. Link

Macé N., Wieland E., Dähn R., Tits J., and Scheinost A. C. (2013) EXAFS investigation on U(VI) immobilization in hardened cement paste: Influence of experimental conditions on speciation. Radiochimica Acta 101, 379-389. Link

Soltermann D., Marques M. F., Baeyens B., Dähn R., Brendlé J. M., Wehrli B., and Bradbury M. H. (2013) Fe(II) sorption on a synthetic clay mineral without structural Fe. A wet chemistry and spectroscopic study. Environmental Science & Technology 47(13), 6978-6986. Link

Aimoz L., Wieland E., Taviot-Gueho C., Dähn R., Vespa M., and Churakov S. V. (2012) Structural insight into iodide uptake by AFm phases. Environmental Science & Technology 46(7), 3874-3881. Link

Aimoz L., Taviot-Gueho C., Churakov S. V., Chukalina M., Dähn R., Curti E., Bordet P., and Vespa M. (2012) Anion and cation order in iodide-bearing Mg/Zn-Al layered double hydroxides. Journal of Physical Chemistry C 116(9), 5460-5475. Link

Marques M. F., Baeyens B., Dähn R., Scheinost A. C., and Bradbury M. H. (2012) U(VI) sorption on montmorillonite in the absence and presence of carbonate: A macroscopic and microscopic study. Geochimica et Cosmochimica Acta 93, 262-277. Link

Churakov S. V. and Dähn R. (2012) Zinc adsorption on clays inferred from atomistic simulations and EXAFS spectroscopy. Environmental Science & Technology 46, 5713-5719. Link

Dähn R., Baeyens B., and Bradbury M. H. (2011) Investigation of the different binding edge sites for Zn on montmorillonite using P-EXAFS – the strong/weak site concept in the 2SPNE SC/CE sorption model. Geochimica et Cosmochimica Acta 75(18), 5154-5168. Link

Dähn R., Vespa M., Tyliszczak T., Wieland E., and Shuh D. K. (2011) Soft X-ray spectromicroscopy of cobalt uptake by cement. Environmental Science & Technology 45(5), 2021-2027. Link

Froideval A., Badillo A., Bertsch J., Churakov S., Dähn R., Degueldre C., Lind T., Paladino D., and Patterson B. D. (2011) Towards possible opportunities in nuclear materials science and technology at an X-ray free electron laser research facility. Journal of Nuclear Materials 416, 242-251. Link

Gaona X., Dähn R., Tits R., Scheinost A. C., and Wieland E. (2011) Uptake of Np(IV) by C–S–H Phases and Cement Paste: An EXAFS Study. Environmental Science & Technology 45(20), 8765-8771. Link

Mandaliev P., Stumpf T., Tits J., Dähn R., Walther C., and Wieland E. (2011) Uptake of Eu(III) by 11 A tobermorite and xonotlite: A TRLFS and EXAFS study. Geochimica et Cosmochimica Acta 75(8), 2017-2029. Link

Mandaliev P., Wieland E., Dähn R., Tits J., Churakov S. V., and Zaharko O. (2010) Mechanisms of Nd(III) uptake by 11 Å tobermorite and xonotlite. Applied Geochemistry 25(6), 763-777. Link

Mandaliev P., Dähn R., Tits J., Wehrli B., and Wieland E., (2010) EXAFS study of Nd (III) binding to amorphous calcium silicate hydrates (C-S-H). Journal of Colloid and Interface Science, 342(1), 1-7. Link

Puranen A., Jonsson M., Dähn R., and Cui D. (2010) Reduction of selenite and selenate on anoxically corroded iron and the synergistic effect of uranyl reduction. Journal of Nuclear Materials 406, 230-237. Link

Wieland E., Dähn R., Vespa M., and Lothenbach B. (2010) Micro-spectroscopic investigation of Al and S speciation in hardened cement paste Cement and Concrete Research 40, 885-891. Link

Wieland E., Macé N., Dähn R., Kunz D., and Tits J. (2010) Macro- and micro-scale studies on U(VI) immobilization in hardened cement paste. Journal of Radioanalytical and Nuclear Chemistry. 286, 793-800. Link

Curti E., Dähn R., Farges F., and Vespa M. (2009) Na, Mg, Ni and Ca distribution and speciation after long-term alteration of simulated nuclear waste glass: A micro-XAS/XRF/XRF and wet chemical study. Geochimica et Cosmochimica Acta 73(8), 2283-2298. Link

Mandaliev P., Dähn R., Wehrli B., and Wieland E. (2009) Macro- and micro-spectroscopic study of Nd (III) uptake mechanisms in hardened cement paste. Environmental Science & Technology, 43(21), 8462-8468. Link

Puranen A., Jonsson M., Dähn R., and Cui D. (2009) Immobilization of selenate by iron in aqueous solution under anoxic conditions and the influence of uranyl. Journal of Nuclear Materials 392, 519-524. Link

Wieland E., Tits J., Kunz D., and Dähn R. (2008) Strontium uptake by cementitious materials. Environmental Science & Technology 42(2), 403-409. Link

Vespa M., Dähn R., Grolimund D., Wieland E., and Scheidegger A. M. (2007) Co speciation in hardened cement paste: A macro- and micro-spectroscopic investigation. Environmental Science & Technology, 41(6), 1902-1908. Link

Vespa M., Wieland E., Dähn R., Grolimund D., and Scheidegger A. M. (2007) Determination of elemental distribution and chemical speciation in highly heterogeneous cementitious materials using synchrotron-based micro-spectroscopic techniques. Cement and Concrete Research 37(11), 1473-1482. Link

Dähn R., Jullien M., Scheidegger A. M., Poinssot C., Baeyens B., and Bradbury M. H. (2006) Identification of neoformed Ni-phyllosilicates upon Ni uptake in montmorillonite. A transmission electron microscopy and X-ray absorption fine structure study. Clays and Clay Minerals 54(2), 209-219. Link

Harfouche M., Wieland E., Dähn R., Fujita T., Tits J., Kunz D., and Tsukamoto M. (2006) EXAFS study of U(VI) uptake by calcium silicate hydrates. Journal of Colloid and Interface Science 303, 195-204. Link

Nachtegaal M., Scheidegger A. M., Dähn R., and Furrer G. (2006) The role of Al in Zn immobilization by montmorillonite. Transactions of the Utrecht University Geological Survey VII, 27-34. Scheidegger A. M., Grolimund D., Harfouche M., Willimann M., Meyer B., Dähn R., Gavillet D., Nicolet M., and Heimgartner P. (2006) The micro-XAS beamline at the Swiss Lights Source (SLS): A new analytical facility suited for micro-beam applications with active samples. Speciation, Techniques and Facilities for Radioactive Materials at Synchrotron Light Sources, NEA Publication, 81-86.

Scheidegger A. M., Vespa M., Grolimund D., Wieland E., Harfouche M., Bonhoure I., and Dähn R. (2006) The use of (micro)-X-ray absorption spectroscopy in cement research. Waste Management 26, 699-705. Link

Scheidegger, A.M., Vespa, M., Wieland, E., Harfouche, M., Grolimund, D., Dähn, R., Jenni A., and Scrivener K. (2006) Micro-scale chemical speciation of highly heterogeneous cementitious materials using synchrotron-based x-ray absorption spectroscopy. Chimia International Journal for Chemistry 60(3), 149. Link

Vespa M., Dähn R., Grolimund D., Harfouche M., Wieland E., and Scheidegger A. M. (2006) Speciation of heavy metals in cement-stabilized waste froms: A micro-spectroscopic study. Journal of Geochemical Exploration 88, 77-80. Link

Vespa M., Dähn R., Grolimund D., Wieland E., and Scheidegger A. M. (2006) Spectroscopic investigation of Ni Speciation in Hardened Cement Paste. Environmental Science & Technology 40(7), 2275-2282. Link

Vespa M., Dähn R., Gallucci E., Grolimund D., Wieland E., and Scheidegger A. M. (2006) Micro-scale investigation of Ni uptake by cement using a combination of scanning electron microscopy and synchrotron-based techniques. Environmental Science & Technology 40(24), 7702-7709. Link

Vespa M., Dähn R., Wieland E., Grolimund D., and Scheidegger A. M. (2006) The influence of hydration time on the Ni uptake by cement. Czechoslovak Journal of Physics 56, Supplement D, 599-607.

Nachtegaal M., Scheidegger A. M., Dähn R., Chateigner D., and Furrer G. (2005) Immobilization of Ni by Al-Modified Montmorillonite: A Novel Uptake Mechanism. Geochimica et Cosmochimica Acta 69(17), 4211-4225. Link

Dähn R., Scheidegger A. M., Manceau A., Schlegel M. L., Baeyens B., Bradbury M. H., and Chateigner D. (2003) Structural evidence for the sorption of Ni(II) atoms on the edges of montmorillonite clay minerals. A polarized X-ray absorption fine structure study. Geochimica et Cosmochimica Acta 67(1), 1-15. Link

Bonhoure I., Scheidegger A. M., Wieland E., and Dähn R. (2002) Iodine species uptake by cement and CSH studied by I K-edge X-ray absorption spectroscopy. Radiochimica Acta 90, 647-651. Link

Dähn R., Scheidegger A. M., Manceau A., Curti E., Baeyens B., Bradbury M. H., and Chateigner D. (2002) Th uptake on montmorillonite: A powder and polarized extended x-ray absorption fine structure (EXAFS) study. Journal of Colloid and Interface Science 249, 8-21. Link

Dähn R., Scheidegger A. M., and Manceau A. (2002) The use of polarized EXAFS to determine uptake processes of metal ions at the mineral-water interface. Mitteilungen der Deutschen Bodenkundlichen Gesellschaft 99, 193-194.

Dähn R., Scheidegger A. M., Manceau A., Baeyens B., and Bradbury M. H. (2002) Local structure of Th complexes on montmorillonite clay mineral determined by extended X-ray absorption fine structure (EXAFS) spectroscopy. Speciation, Techniques and Facilities for Radioactive Materials at Synchrotron Light Sources, NEA Publication, 75-81.

Dähn R., Scheidegger A. M., Manceau A., Schlegel M. L., Baeyens B., Bradbury M. H., and Morales M. (2002) Neoformation of Ni phyllosilicate upon Ni uptake on montmorillonite: A kinetics study by powder and polarized extended X-ray absorption fine structure spectroscopy. Geochimica et Cosmochimica Acta 66(13), 2335-2347. Link

Hennig C., Reich T., Dähn R., and Scheidegger A. M. (2002) Structure of uranium sorption complexes at montmorillonite edge sites. Radiochimica Acta 90, 653-657. Link

Dähn R., Scheidegger A. M., Manceau A., Schlegel M. L., Baeyens B., and Bradbury M. H. (2001) Ni clay neoformation on montmorillonite surface. Journal of Synchrotron Radiation 8, 533-535. Link

Scheidegger A. M., Wieland E., Scheinost A. C., Dähn R., and Spieler P. (2001) Ni phases formed in cement and cement systems under highly alkaline conditions: An XAFS study. Journal of Synchrotron Radiation 8, 916-918. Link

Ziegler F., Scheidegger A. M., Johnson C. A., Dähn R., and Wieland E. (2001) Sorption mechanisms of zinc to calcium silicate hydrate: X-ray absorption fine structure (XAFS) investigation. Environmental Science & Technology 35, 1550-1555. Link

Scheidegger A. M., Wieland E., Scheinost A. C., Dähn R., and Spieler P. (2000) Spectroscopic evidence for the formation of layered Ni-Al double hydroxides in cement. Environmental Science & Technology 34, 4545-4548. Link

Scheidegger A. M., Dähn R., Baeyens B., Bradbury M. H., and Sparks D. L. (1999) Use of XAS at the Swiss Nuclear Waste Management Laboratory. Speciation, Techniques and Facilities for Radioactive Materials at Synchrotron Light Sources, NEA Publication, 145-152.

Drube W., Treusch R., Dähn R., Griebenow M., Grehk M., and Materlik G. (1996) Threshold behaviour of L3-M4,5M4,5 Auger transitions in 4d metals. Journal of Electron Spectroscopy and Related Phenomena 79, 223-228. Link