Search results for "XRF"

A multivariate statistical approach of X-ray fluorescence characterization of a large collection of reverse glass paintings

2019

We present an X-ray fluorescence spectroscopy (XRF) study combined with a multivariate approach that allow to detect compositional differences and similarities among the glass supports of a large set of reverse glass paintings belonging to the collection of the Mistretta museum. Reverse painting on glass is an old decorative technique used since the Roman time consisting in applying a cold paint layer on the reverse side of a glass support. The collection shows a large spreading of provenience and dating of the items. In consideration of the current classification solely based on stylistic criteria, we applied a multivariate analysis on the XRF measurements data set to find a more objective…

Investigation of composition of archeological Helmets, type Montefortino

2019

In this work, a preliminary non invasive and non destructive investigation, performed on two helmets, is presented.

Non-invasive characterization of archaeological polychrome pottery and metallic artefacts: advantage and limits of XRF in situ analysis

2014

Multi-technique characterization of gold electroplating on silver substrates for cultural heritage applications

2017

Proceedings of the 12th European Conference on Accelerators in Applied Research and Technology (ECAART12).-- et al.

Le indagini scientifiche per lo studio e la conservazione dei beni culturali : un approccio analitico integrato, la conoscenza dei materiali costitut…

2019

The icon Virgin Hodegetria, now in Santa Maria Nuova Cathedral in Monreale near Palermo (Italy), probably dates from the beginning of thirteen century could be considered one of the earliest examples of medieval icon in Sicily. The icon is distinguished from other southern icons by the strong Byzantine matrix and by its size (169x131x3 cm). Since 2015, the icon is part of the Arab-Norman Palermo UNESCO Heritage. This paper will deal with historical and scientific investigations on the icon to better understand the painting materials, the executive technique and to resolve question about on-going restoration in planning a complex conservation project. Examination of the icon was both non-inv…

Electrode–Electrolyte Compatibility in Solid-Oxide Fuel Cells: Investigation of the LSM–LNC Interface with X-ray Microspectroscopy

2015

Ca:LaNbO4 (LNC) constitutes the last real breakthrough in high-temperature proton conductors, with better chemical and mechanical stability with respect to cerate and zirconate perovskites. However, the low amount of bivalent dopant that can be hosted in the LaNbO4 matrix poses a limit to the proton concentration in the electrolyte. Using synchrotron X-ray microspectroscopy, we investigated the compatibility of annealed LNC/LSM electrolyte/cathode bilayers for proton-conducting SOFCs. The element maps are complemented by microEXAFS and microXANES, giving information on the fate of different cations after diffusion. The X-ray microspectroscopy approach described here is applied for the first…

A combination of portable non-invasive techniques to study on reverse glass paintings at Mistretta museum

2019

Abstract Reverse painting on glass is an old decorative technique used since the Roman time consisting in applying a cold paint layer on the reverse side. The Sicilian Regional Museum of forestry and pastoral traditions in Mistretta (Messina, Italy) houses the largest collection of reverse glass paintings in Italy with a total of 195 artworks. The artworks are attributed to the different Italian geographic area from north to south Italy. A combination of non-invasive analysis by using complementary portable spectroscopic instrumentations (mainly XRF and Raman Spectrometers) was applied on some selection of reverse glass paintings. The goal of the work is the characterization of the nature o…

Characterization of foxing stains in early twentieth century photographic and paper materials

2016

The subject of this present work is a group of nine historical pictures shot in Palermo by the Sicilian photographer E. Interguglielmi in 1912. They are nine matte-collodion prints mounted on the original cardboard supports and all of them show foxing stains affecting the paper surface. In order to characterise the chemical composition of the supports and investigate foxing spots, non-destructive and micro-destructive analysis were carried out. X-rays fluorescence (XRF) analysis was used to characterise the elemental composition of all the mounting boards, allowing a comparison between the foxing spots and non-affected areas. Laser-Induced Breakdown Spectroscopy was used to investigate the …

The DEPFET based Focal Plane Detectors for MIXS on BepiColombo

2010

X-ray detectors based on arrays of DEPFET macropixels, which consist of a silicon drift detector combined with a detector/amplifier structure DEPFET as readout node, provide a convenient and flexible way to adapt the pixel size of a focal plane detector to the resolving power of any given X-ray optical system. Macropixels combine the traditional benefits of an SDD, like scalability, arbitrary geometry and excellent QE even in the low energy range, with the advantages of DEPFET structures: Charge storage capability, near Fano-limited energy resolution, low power consumption and high speed readout. Being part of the scientific payload of ESA's BepiColombo mission, the MIXS instrument will be …

EDXRF analysis of the Pentecost Triptych from the “São Pedro de Miragaia” church (Porto, Portugal)

2013

Abstract EDXRF spectrometry was used to determine the pigment composition of the Pentecost Triptych, a Flemish masterpiece located at the Church of Sao Pedro de Miragaia (Porto, Portugal). The triptych was restored at the beginning of the 20th century and presents a great number of zones with repaints and colour alterations that can be observed on the whole of their surface. The identification of the original pigments and restoration pigments was based on their characteristic colour and the correlation between the detected elements and the named “key elements” of ancient pigments (Ca, Fe, Cu, Hg, Pb,…) and modern pigments (Ti, Ba, Cr, Zn, Co, Cd,…). The analysis of the triptych has been car…