References of "Mathis, François"
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See detailAnalyse de bijoux mérovingiens en Belgique
Mathis, François ULg; Othmane, Guillaume; Vrielynck, Olivier

Conference (2009)

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See detailDetection et analyse des patines intentionelles des bronzes antiques : apport des IBA en faisceau extrait
Mathis, François ULg; Salomon, Joseph; Pichon, Laurent et al

Conference (2009)

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See detailGlass production in late antiquity
Van Wersch, Line ULg; Mathis, François ULg; Dupuis, Thomas ULg et al

Poster (2009)

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See detailÉtude des verres du Haut Moyen Âge découverts dans l’église des saints Hermès et Alexandre à Theux
Van Wersch, Line ULg; Mathis, François ULg; Hoffsummer, Patrick ULg

in Balcon-Berry, Sylvie; Perrot, Françoise; Sapin, Christian (Eds.) Vitrail, Verre et Archéologie entre le Ve et le XIIe siècle (2009)

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See detailMerovingian pottery in the Mosan Valley: diffusion and consumption
Van Wersch, Line ULg; Coquinot, Yvan; Mathis, François ULg et al

Poster (2009)

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See detailIntentional patina of metal archaeological artefacts; a non-destructive investigation of Egyptian and Roman museum treasures
Mathis, François ULg; Aucouturier, Marc; Robcis, Dominique et al

Conference (2009)

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See detailHMTY-KM (Black Copper) and the egyptian bronzes collection of the Musee du Louvre
Mathis, François ULg; Delange, Elisabeth; Robcis, Dominique et al

in Journal of Cultural Heritage (2009), 10

At the instigation of the Musée du Louvre’s Department of Egyptian Antiquities, an intensive programme to study black bronze has been carried out at the Centre de Recherche et de Restauration des Muse´es ... [more ▼]

At the instigation of the Musée du Louvre’s Department of Egyptian Antiquities, an intensive programme to study black bronze has been carried out at the Centre de Recherche et de Restauration des Muse´es de France. Systematic research has been undertaken on the museum’s collection to identify objects that might have an intentional black patina. The same experimental protocol has been applied to all the objects, alllowing this study to be one of the most important coherent investigation on this type of bronze decoration. It involves the use of non-invasive analytical methods in order to obtain the maximum amount of information possible about the chemical nature and structure of the surface layer. The protocol makes it possible to compare objects and to propose an interpretation of how this decorative technique evolved during the Egyptian period. Based on previous stylistic investigations (by J. Cooney, 1966) and personal observation, sixteen objects dating from the Middle Kingdom to the Late Period were selected. Thanks to elemental analyses, twelve of them were identified as being intentionally patinated. Only ten of these could be described as hmty-km, because the base patinated alloy contains small amounts of gold and/or silver and the black patina is made up mainly of cuprous oxide Cu2O (cuprite). Among the four other objects, one patina is very close to the black bronze patina, but contains neither gold nor silver. Three other pieces have an unusual patina. A lack of other comparable examples makes it very difficult to determine whether the patinas are of ancient origin. [less ▲]

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See detailTowards the differentiation of non-treated and treated corundum minerals by ion-beam-induced luminescence and other complementary techniques
Calvo Del Castillo, Helena ULg; Dupuis, Thomas ULg; Mathis, François ULg et al

in Analytical and Bioanalytical Chemistry (2009), 394

Abstract  Differentiation of treated and non-treated gemstones is a chief concern for major jewellery import companies. Low-quality corundum specimens coming from Asia appear to be often treated with heat ... [more ▼]

Abstract  Differentiation of treated and non-treated gemstones is a chief concern for major jewellery import companies. Low-quality corundum specimens coming from Asia appear to be often treated with heat, BeO or flux in order to enhance their properties as precious minerals. A set of corundum samples, rubies and sapphires from different origins, both treated and non-treated has been analysed at the Centre Européen d’Archéométrie, with ion-beam-induced luminescence (IBIL) and other complementary techniques such as Raman, proton-induced X-ray emission (PIXE), and proton-induced gamma-ray emission (PIGE). IBIL, also known as ionoluminescence, has been used before to detect impurities or defects inside synthetic materials and natural minerals; its use for the discrimination of gemstone simulants or synthetic analogues has been elsewhere discussed (Cavenago-Bignami Moneta, Gemología, Tomo I Piedras preciosas, perlas, corales, marfil. Ediciones Omega, Barcelona, 1991). PIXE has been frequently applied in the archaeometric field for material characterisation and provenance studies of minerals (Hughes, Ruby & sapphire. RWH Publishing, Fallbrook, 1997; Calvo del Castillo et al., Anal Bioanal Chem 387:869–878, 2007; Calligaro et al., NIM-B 189:320–327, 2002) and PIGE complements the elemental analysis by detecting light elements in these materials such as—and lighter than—sodium that cannot be identified with the PIXE technique (Sanchez et al., NIM-B 130:682–686, 1997; Emmett et al., Gems Gemology 39:84–135, 2003). The micro-Raman technique has also been used complementarily to ion beam analysis techniques for mineral characterisation (Novak et al., Appl Surf Sci 231–232:917–920, 2004). The aim of this study is to provide new means for systematic analysis of corundum gemstone-quality mineral, alternative to the traditional gemmologic methods; for this purpose, a Spanish jewellery import company supplied us with a number of natural corundum samples coming from different places (part of them treated as explained above). The PIXE elemental concentrations of the samples showed large quantities of calcium and lead in some cases that can be linked to treatment with fluxes or lead oxide. The plot of the chromium and iron concentration grouped the samples in various aggregates that corresponded to the different types of corundum analysed. Micro-Raman complemented the PIXE analysis corroborating the presence of lead oxides but the use of the PIGE technique was not successful for the detection of beryllium due to the low cross section of the nuclear reaction chosen for its identification. IBIL was capable of distinguishing between treated and non-treated samples of the same type based on the luminescent features of the materials. [less ▲]

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See detailMesoporous TiO2 thin films for photovoltaic applications
Dewalque, Jennifer ULg; Cloots, Rudi ULg; Mathis, François ULg et al

Poster (2008, September 08)

Thin films of nanocrystalline, mesostructured titanium dioxide are very promising materials to build low cost and efficient photovoltaic devices. TiO2 present a high chemical stability and electronic ... [more ▼]

Thin films of nanocrystalline, mesostructured titanium dioxide are very promising materials to build low cost and efficient photovoltaic devices. TiO2 present a high chemical stability and electronic properties such as photoinduced electronic transfer properties associated with the anatase phase. For many applications, highly porous nanostructured thin films with accessible pores are preferable to dense ones. Indeed, high accessible porosity leads to high surface area increasing the electron transfer area. [less ▲]

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See detailImproved energy resolution of a cyclotron beam for RBS measurements
Chene, Grégoire ULg; Garnir, Henri-Pierre ULg; Marchal, André ULg et al

in Nuclear Instruments & Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms (2008), 266(10), 2110-2112

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See detailDiscovery and characterization of an unknown blue-green Maya pigment: Veszelyite
Moreno, R Garcia; Mathis, François ULg; Mazel, V. et al

in Archaeometry (2008), 50(4), 658-667

Blue-green mosaic and polychrome masks and funerary offerings from the royal tombs of Calakmul, Mexico, were analysed by scanning electron microscope equipped with energy dispersive X-ray spectroscopy ... [more ▼]

Blue-green mosaic and polychrome masks and funerary offerings from the royal tombs of Calakmul, Mexico, were analysed by scanning electron microscope equipped with energy dispersive X-ray spectroscopy (SEM-EDS), X-ray diffraction (XRD), and particle induced X-ray emission (PIXE). This led to the first identification of the use of veszelyite, a rare hydrated copper-zinc phosphate, as green pigment. Analyses of a geological sample of this mineral have been done to confirm the characterization of this Mayan pigment, which might help determine pre-Columbian trade routes of precious and luxury objects in the ancient Maya Classic period (ad 250-800). [less ▲]

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