Revealing the Distribution of Metal Carboxylates in Oil Paint from the Micro- to Nanoscale
- National Gallery of Art, Landover, MD (United States)
- Univ. Paris-Saclay, Gif-sur-Yvette (France)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- College of William and Mary, Williamsburg, VA (United States)
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 in this study 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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institute of Standards and Technology (NIST); Univ. of Maryland
- Grant/Contract Number:
- AC02-05CH11231; 70NANB14H209
- OSTI ID:
- 1656526
- Alternate ID(s):
- OSTI ID: 1544904
- Journal Information:
- Angewandte Chemie (International Edition), Vol. 58, Issue 34; ISSN 1433-7851
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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