Revealing the Distribution of Metal Carboxylates in Oil Paint from the Micro- to Nanoscale.
IR spectroscopy
PTIR
analytical methods
art conservation
metal carboxylates
Journal
Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
Titre abrégé: Angew Chem Int Ed Engl
Pays: Germany
ID NLM: 0370543
Informations de publication
Date de publication:
19 Aug 2019
19 Aug 2019
Historique:
received:
22
03
2019
revised:
24
05
2019
pubmed:
22
6
2019
medline:
22
6
2019
entrez:
22
6
2019
Statut:
ppublish
Résumé
Oil paints comprise pigments, drying oils, and additives that together confer desirable properties, but can react to form metal carboxylates (soaps) that may damage artworks over time. To obtain information on soap formation and aggregation, we introduce a new tapping-mode measurement paradigm for the photothermal induced resonance (PTIR) technique that enables nanoscale IR spectroscopy and imaging on highly heterogenous and rough paint thin sections. PTIR is used in combination with μ-computed tomography and IR microscopy to determine the distribution of metal carboxylates in a 23-year old oil paint of known formulation. Results show that heterogeneous agglomerates of Al-stearate and a Zn-carboxylate complex with Zn-stearate nano-aggregates in proximity are distributed randomly in the paint. The gradients of zinc carboxylates are unrelated to the Al-stearate distribution. These measurements open a new chemically sensitive nanoscale observation window on the distribution of metal soaps that can bring insights for understanding soap formation in oil paint.
Identifiants
pubmed: 31226237
doi: 10.1002/anie.201903553
pmc: PMC9798385
mid: NIHMS1541663
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
11652-11656Subventions
Organisme : Intramural NIST DOC
ID : 9999-NIST
Pays : United States
Organisme : DOE Office of Science User Facility
ID : DE-AC02-05CH11231
Organisme : National Gallery of Art
ID : Charles E. Culpeper Fellowship
Organisme : University of Maryland|National Institute of Standards and Technology
ID : 70NANB14H209
Informations de copyright
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
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