Thermal behavior of mercury carboxylates as paintings' degradation products
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F24%3A00597749" target="_blank" >RIV/61388980:_____/24:00597749 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/24:10490480
Result on the web
<a href="https://hdl.handle.net/11104/0359596" target="_blank" >https://hdl.handle.net/11104/0359596</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s10973-024-13463-3" target="_blank" >10.1007/s10973-024-13463-3</a>
Alternative languages
Result language
angličtina
Original language name
Thermal behavior of mercury carboxylates as paintings' degradation products
Original language description
Mercury long-chain carboxylates have been identified recently as degradation products resulting from saponification occurring in painted artworks. Saponification belongs among the degradation processes endangering undesirably the appearance and stability of painted artworks, significant treasures of humanity. The mechanism of saponification has not been still fully understood because of the enormous complexity of both painting materials and factors triggering the deterioration. Moreover, the properties and stability of metal soaps resulting from this degradation are also poorly understood, complicating the choice of suitable conservation treatment. Relining, a heat-based restoration technique for reinforcing deteriorated canvases, can induce irreversible changes in paint layers, being applied inappropriately. Within this study, we report thermal behavior and stability of mercury palmitate (Hg(C16)2), mercury stearate (Hg(C18)2), and their respective mixtures with linseed oil in the temperature range of 25-150 degrees C, employing a combination of techniques, including DSC, TG-MS, FTIR, XRPD, and in situ high-temperature FTIR and XRPD. It was observed that while Hg(C16)2 and Hg(C18)2 undergo partial decomposition around 150 degrees C, in a mixture with linseed oil, they decompose rapidly at significantly lower temperature (around 100 degrees C). The decomposition of mercury carboxylates results in the formation of metallic mercury, a volatile toxic substance, and free fatty acids, reactants capable of further development of saponification in paint layers. In addition, a structural polymorph of Hg(C16)2 and Hg(C18)2 with a different arrangement of carboxylate groups around the mercury atom was formed after the heat treatment during the cooling down at ca 120 degrees C as documented by in situ high-temperature XRPD and FTIR.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10402 - Inorganic and nuclear chemistry
Result continuities
Project
<a href="/en/project/LM2023066" target="_blank" >LM2023066: Nanomaterials and Nanotechnologies for Environment Protection and Sustainable Future</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Thermal Analysis and Calorimetry
ISSN
1388-6150
e-ISSN
1588-2926
Volume of the periodical
149
Issue of the periodical within the volume
23
Country of publishing house
HU - HUNGARY
Number of pages
12
Pages from-to
13773-13784
UT code for WoS article
001291932700001
EID of the result in the Scopus database
2-s2.0-85201434852