Understanding soap formation in paint films by 207Pb, 119Sn and 13C solid-state NMR

Jaclyn Catalano, Yao Yao, Anna Murphy, Nicholas Zumbulyadis, Silvia A. Centeno, Cecil Dybowski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The formation of lead carboxylates (lead soaps) has been identified as the cause of deterioration of hundreds of oil paintings. Soaps form when heavy metal-containing pigments, for example lead white and lead-tin yellow, react with saturated fatty acids in the oil medium. Understanding the mechanism of the reactions requires chemical information, which can be obtained with solid-state 207Pb, 119Sn and 13C NMR spectroscopy. Using the chemical-shift tensors determined by solid-state NMR we can gain structural insights on the coordination environment of the lead carboxylates and identify and quantify components in a paint film mixture. We have examined the spectroscopy of lead-containing pigments, lead carboxylates, and model paint films that were subjected to accelerated aging. We have also begun to investigate the dynamics of soap formation by 13C NMR spectroscopy. The NMR methods applied to the model paint systems could also be applied to other lead-containing materials.

Original languageEnglish
Title of host publicationMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014
PublisherAssociation for Iron and Steel Technology, AISTECH
Pages2161-2168
Number of pages8
ISBN (Electronic)9781634397230
StatePublished - 1 Jan 2014
EventMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014 - Pittsburgh, United States
Duration: 12 Oct 201416 Oct 2014

Publication series

NameMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014
Volume3

Other

OtherMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014
CountryUnited States
CityPittsburgh
Period12/10/1416/10/14

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Keywords

  • Lead NMR
  • Lead carboxylases
  • Lead pigments
  • Paint films
  • Solid-state NMR
  • Tin NMR

Cite this

Catalano, J., Yao, Y., Murphy, A., Zumbulyadis, N., Centeno, S. A., & Dybowski, C. (2014). Understanding soap formation in paint films by 207Pb, 119Sn and 13C solid-state NMR. In Materials Science and Technology Conference and Exhibition 2014, MS and T 2014 (pp. 2161-2168). (Materials Science and Technology Conference and Exhibition 2014, MS and T 2014; Vol. 3). Association for Iron and Steel Technology, AISTECH.