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Title: Revealing the Distribution of Metal Carboxylates in Oil Paint from the Micro- to Nanoscale

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [2]; ORCiD logo [6]; ORCiD logo [4]; ORCiD logo [1]
  1. National Gallery of Art, Landover, MD (United States)
  2. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  6. College of William and Mary, Williamsburg, VA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institute of Standards and Technology (NIST); Univ. of Maryland
OSTI Identifier:
1656526
Alternate Identifier(s):
OSTI ID: 1544904
Grant/Contract Number:  
AC02-05CH11231; 70NANB14H209
Resource Type:
Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition); Journal Volume: 58; Journal Issue: 34; Journal ID: ISSN 1433-7851
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Ma, Xiao, Beltran, Victoria, Ramer, Georg, Pavlidis, Georges, Parkinson, Dilworth Y., Thoury, Mathieu, Meldrum, Tyler, Centrone, Andrea, and Berrie, Barbara H.. Revealing the Distribution of Metal Carboxylates in Oil Paint from the Micro- to Nanoscale. United States: N. p., 2019. Web. https://doi.org/10.1002/anie.201903553.
Ma, Xiao, Beltran, Victoria, Ramer, Georg, Pavlidis, Georges, Parkinson, Dilworth Y., Thoury, Mathieu, Meldrum, Tyler, Centrone, Andrea, & Berrie, Barbara H.. Revealing the Distribution of Metal Carboxylates in Oil Paint from the Micro- to Nanoscale. United States. https://doi.org/10.1002/anie.201903553
Ma, Xiao, Beltran, Victoria, Ramer, Georg, Pavlidis, Georges, Parkinson, Dilworth Y., Thoury, Mathieu, Meldrum, Tyler, Centrone, Andrea, and Berrie, Barbara H.. Wed . "Revealing the Distribution of Metal Carboxylates in Oil Paint from the Micro- to Nanoscale". United States. https://doi.org/10.1002/anie.201903553. https://www.osti.gov/servlets/purl/1656526.
@article{osti_1656526,
title = {Revealing the Distribution of Metal Carboxylates in Oil Paint from the Micro- to Nanoscale},
author = {Ma, Xiao and Beltran, Victoria and Ramer, Georg and Pavlidis, Georges and Parkinson, Dilworth Y. and Thoury, Mathieu and Meldrum, Tyler and Centrone, Andrea and Berrie, Barbara H.},
abstractNote = {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.},
doi = {10.1002/anie.201903553},
journal = {Angewandte Chemie (International Edition)},
number = 34,
volume = 58,
place = {United States},
year = {2019},
month = {7}
}

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