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Micro infrared spectroscopy discrimination capability of compounds in complex matrices of thin layers in real sample coatings from artworks

Beltran, Victòria ; Salvadó, Nati ; Butí, Salvador ; Cinque, Gianfelice

Microchemical journal, 2015-01, Vol.118, p.115-123 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Micro infrared spectroscopy discrimination capability of compounds in complex matrices of thin layers in real sample coatings from artworks
  • Autor: Beltran, Victòria ; Salvadó, Nati ; Butí, Salvador ; Cinque, Gianfelice
  • Assuntos: Arquitectura ; Coatings ; Colophony ; Colorants, pintures i vernissos ; Cultural heritage ; Enginyeria química ; Espectroscòpia infraroja de transformada de Fourier ; Fourier transform infrared spectroscopy ; Guanine ; Identificació ; Indústries químiques ; Infrared spectroscopy ; MicroFTIR ; Pintura ; Pintura barroca ; Protein ; Radiació sincrotrònica ; Synchrotron radiation ; Varnish ; Varnish and varnishing ; Vernissos ; Vibrational microspectroscopy ; Vibrational spectra ; Wax ; Àrees temàtiques de la UPC
  • É parte de: Microchemical journal, 2015-01, Vol.118, p.115-123
  • Descrição: The presence of coating on manufactures either to protect them from the environment, or to give them specific properties—as well as simply to change their aspect—has been shown to be a constant practise throughout history. Their characterization is complex not only because of the inherent variability and diversity of the composition, but also due to the small amount of sample material available. A methodology to study those coatings using microFTIR is proposed. In some cases, the use of microSR-FTIR, which heavily increases spatial resolution particularly appropriate for the analysis of these heterogeneous samples, is also proposed. Data processing tools such as distribution maps of specific infrared bands and curve fitting facilitate the interpretation of the spectra and help identify heavily overlapped spectra. Through the identification of individual bands, it has been possible to discriminate materials and comprehend the interaction processes during aging. Infrared spectra from reference aged materials of known production dates and which are essential in understanding those processes are given. A set of selected case studies including materials of different chemical natures and various historical periods are presented: identification of guanine on the inner coating of a hope chest; determination of a protein glue coating from a gilded Baroque altarpiece; assessment of a beeswax superficial application during the historical restoration of a late 19th century canvas painting; identification of impurities of shellac wax in a shellac coating on a wood moulding from a medieval altarpiece; aging and reaction compounds in Pinus resin, drying oil and green copper pigment mixtures used as colour coatings on Baroque and modern desks. •Micro-FTIR approach for the study of micro samples of coatings from artworks.•Strategy for identification of organic, inorganic, reaction and aging compounds.•Identification of guanine (nucleic acid base) unexpected pigment in artworks.•Distribution IR maps can shed light on how reaction compounds have been distributed.•Interaction processes studied during the aging of Pinus resin-oil-pigment mixtures.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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