A joint use of Raman and infrared spectroscopies for the identification of natural organic media used in ancient varnishesReportar como inadecuado




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1 LADIR - Laboratoire de Dynamique Interactions et Réactivité 2 Centre de Recherche et de Restauration des Musées de France 3 Laboratoire de recherche et de restauration

Abstract : Various natural organic film-making media from several chemical families have been used as varnishes. An improvement in the identification of these materials by the combination of Raman and infrared spectroscopies is here presented. Fourteen unaged reference samples representative of resins, glues, gums and oils were analyzed. FT-Raman and IR spectra were all compared in order to discriminate the different classes of organic media by considering their spectroscopic features. It led to a flowchart for material discrimination based on simple, notable and specific criteria. It appears that the different families gums, glues, oils and resins and subfamilies di-triterpenoids resins are easily differentiated thanks to their specific structural composition. However, discerning between compounds from a same subgroup, for example diterpenoid resins, could be ambiguous because the spectra depend on the sample aspect, age and degradations.

keyword : FT-Raman infrared natural organicmedia terpenic resins material discrimination





Autor: Céline Daher - Céline Paris - Anne-Solenn Le Hô - Ludovic Bellot-Gurlet - Jean-Philippe Echard -

Fuente: https://hal.archives-ouvertes.fr/



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