Université de Fribourg

Archaeometrical study of Khmer stoneware from the Angkorian period: Results from the Cerangkor Project

Thirion‐Merle, V. ; Thierrin‐Michael, Gisela ; Desbat, A.

In: Archaeometry, 2019, vol. 61, no. 6, p. 1246–1263

In the area around Angkor, Cambodia, several ceramics kilns dating from the ninth to 15th centuries ce have been discovered since 1995. The technical, typological and compositional characterization of their production has been one of the main goals of the Cerangkor Project. Samples of green‐glazed ‘Kulen‐type' stoneware and non‐ glazed stoneware produced in five kiln sites in the...

Université de Fribourg

Eighteen years of steel–bentonite interaction in the FEBEX in situ test at the Grimsel Test Site in Switzerland

Hadi, Jebril ; Wersin, Paul ; Serneels, Vincent ; Greneche, Jean-Marc

In: Clays and Clay Minerals, 2019, vol. 67, no. 2, p. 111–131

Corrosion of steel canisters containing buried high-level radioactive waste is a relevant issue for the long-term integrity of repositories. The purpose of the present study was to evaluate this issue by examining two differently corroded blocks originating from a full-scale in situ test of the FEBEX bentonite site in Switzerland. The FEBEX experiment was designed initially as a feasibility...

Université de Fribourg

Hybrid magnetic iron oxide nanoparticles with tunable field-directed self-assembly

Malik, Vikash ; Pal, Antara ; Pravaz, Olivier ; Crassous, Jérôme J. ; Granville, Simon ; Grobéty, Bernard ; Hirt, Ann M. ; Dietsch, Hervé ; Schurtenberger, Peter

In: Nanoscale, 2017, vol. 9, no. 38, p. 14405-14413

We describe the synthesis of hybrid magnetic ellipsoidal nanoparticles that consist of a mixture of two different iron oxide phases, hematite (α-Fe2O3) and maghemite (γ- Fe2O3), and characterize their magnetic field-driven self-assembly. We demonstrate that the relative amount of the two phases can be adjusted in a continuous way by varying the reaction time during the synthesis, leading to...

Université de Fribourg

Review: current international research into cellulose nanofibres and nanocomposites

Eichhorn, S. J. ; Dufresne, A. ; Aranguren, M. ; Marcovich, N. E. ; Capadona, J. R. ; Rowan, S. J. ; Weder, Christoph ; Thielemans, W. ; Roman, M. ; Renneckar, S. ; Gindl, W. ; Veigel, S. ; Keckes, J. ; Yano, H. ; Abe, K. ; Nogi, M. ; Nakagaito, A. N. ; Mangalam, A. ; Simonsen, J. ; Benight, A. S. ; Bismarck, A. ; Berglund, L. A. ; Peijs, T.

In: Journal of Materials Science, 2010, vol. 45, no. 1, p. 1-33

This paper provides an overview of recent progress made in the area of cellulose nanofibre-based nanocomposites. An introduction into the methods used to isolate cellulose nanofibres (nanowhiskers, nanofibrils) is given, with details of their structure. Following this, the article is split into sections dealing with processing and characterisation of cellulose nanocomposites and new developments...

Université de Fribourg

Functional polymer blends and nanocomposites

Weder, Christoph

In: Chimia, 2009, vol. 63, no. 11, p. 758–763

The broad class of (multi)functional polymers with unusual combinations of optical, electronic, mechanical and other properties is attracting significant interest, because it conceptually combines the advantages of polymers - low cost, ease of processing and a range of attractive mechanical characteristics - with the specific, tailorable properties of functional organic molecules. The caveat is...

Université de Fribourg

Antimonate opaque glaze colours from the faience manufacture of Le Bois d'Épense (19th century, Northeastern France)*

Maggetti, Marino ; Neururer, Christoph ; Rosen, J.

In: Archaeometry, 2009, vol. 51, no. 5, p. 791-807

Three types of antimony-based, opaque ceramic colours were used in the faience workshop of Le Bois d'Épense during the first decades of the 19th century; that is, yellow, tawny and green. Yellow is generated by lead antimonate crystals (Naples Yellow), which are incorporated into an uncoloured glass matrix. According to SEM–EDS measurements, these pigments contain iron. The tawny colour is the...

Université de Fribourg

Paul-Louis Cyfflé's (1724-1806) Terre de Lorraine: a technological study

Maggetti, Marino ; Rosen, J. ; Neururer, Chrisoph ; Serneels, Vincent

In: Archaeometry, 2009, p. -

Fragments of four Terre de Lorraine biscuit figurines were subjected to porosity analysis, X-ray fluorescence analysis, X-ray diffraction analysis, backscattered-electron image analysis—coupled with energy dispersive spectrometry—and electron backscatter diffraction analysis to determine the porosity, bulk, major, minor and trace element compositions, and the composition and the proportion of...