μ‐Raman mapping to study calcium oxalate historical films

Claudia Conti · Irene Aliatis · Chiara Colombo · Marinella Greco · Elena Possenti · Marco Realini +2 more

31 citations0/0 files storedJournal of Raman Spectroscopy

No readable copy stored yet — this record is metadata only.

No open-access location is known for this record yet.

Literature note Cite in a project Citation map

Cultural Heritage Materials Analysis Mineralogy and Gemology Studies Building materials and conservation

Abstract

This study is focused on the characterization of the oxalate films observed on the surfaces of several ancient monuments. They consist mostly of calcium oxalate in the common forms, namely whewellite (CaC 2 O 4 • H 2 O) and weddellite (CaC 2 O 4 • (2 + x) H 2 O), which chemically differ only by the number of water molecules contained in the crystalline unit cell. In order to ascertain the controversial origin of the calcium oxalate films, the settlement of their mineralogical composition and stratigraphy is essential. Because of the lack of analytical techniques able to discriminate, with an acceptable resolution, between whewellite and weddellite in cross‐sections, in the literature, very little attention has been paid to these data. μ‐Raman mapping allowed for the first time, to unequivocally identify the phases which occur in the calcium oxalate films and to obtain direct information, at high spatial resolution, on their distribution with respect to the material surface. μ‐Raman mapping carried out on polished cross‐sections of samples belonging to the façade of the Cathedral of Trento showed, for a yet unknown reason, either a random distribution of the two phases or a higher content of weddellite in the external portions of the calcium oxalate films. Meaningful differences in the mineralogical composition have been highlighted between areas of the monument sheltered from rainfall and those exposed to rainfall. A multivariate approach using principal components analysis has been used to analyze the huge number of spectra in the Raman maps. Copyright © 2012 John Wiley & Sons, Ltd.

Paper brief

Loading…

Cite this work

Citation unavailable for this work.

BibTeX RIS CSL-JSON

No public copy is stored for this record, so only the metadata is cited.

Citations in this library

Citation map →

Stored only when both papers are in the corpus — 31 citations exist upstream.

References

2004Black crusts and patinas on Pentelic marble from the Parthenon and Erechtheum (Acropolis, Athens): characterization and origin 2004Micro-structural characterization of black crust and laser cleaning of building stones by micro-Raman and SEM techniques 1997Fourier Transform Raman analysis of paint fragments from biodeteriorated Renaissance frescoes 2010Advances in Raman mapping of works of art 2010Micro‐Raman mapping on polished cross sections: a tool to define the penetration depth of conservation treatment on cultural heritage 1973Problemi di conservazione

Cited by

2016In situ Raman mapping of art objects 2015Brownish alterations on the marble statues in the church of Orsanmichele in Florence: what is their origin?2018Raman and time of flight secondary ion mass spectrometry investigation answers specific conservation questions on Bosch painting Saint Wilgefortis Triptych 2017Close to the diffraction limit in high resolution ATR FTIR mapping: demonstration on micrometric multi-layered art systems 2014The ‘Madonna and Child Enthroned with Saints’ of Ambrogio Lorenzetti in the St. Augustine Church (Siena, Italy): Raman microspectroscopy and SEM-EDS characterisation of the pigments 2020

Explore the map →

Papers that cite the same references — the relational fallback while embeddings are still backfilling.

Imported from OpenAlex (CC0) — nothing here is generated.