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Ammonium monoethyloxalate (AmEtOx): a new agent for the conservation of carbonate stone substrates

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10.1039/D0NJ06001A
 
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Gimeno Torrente, DomingoMés informació
Vallcorba, Oriol
Navarro Ezquerra, AntoniaMés informacióMés informacióMés informació
Aragoni, M. Carla
Giacopetti, Laura
Arca, Massimiliano
Carcangiu, Gianfranco
Columbu, Stefano
Isaia, Francesco
Lippolis, Vito
Meloni, Paola
Podda, Enrico
Rius Palleiro, Jordi
Pintus, Anna
Document typeArticle
Defense date2021
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
The ammonium salt of monoethyloxalate (AmEtOx) was investigated as a novel precursor for the conservation of carbonate stone substrates, such as biomicritic limestone and marble. Full characterization of treated and untreated authentic stone samples was carried out by means of SEM, X-ray powder diffraction, synchrotron tts-µXRD measurements, mercury intrusion porosimetry, determination of water transport properties, and pull-off tests. The improved solubility (1.49 M, 20.1% w/w) of AmEtOx as compared to that of ammonium oxalate (AmOx; 0.4 M, 5% w/w) results in the formation of microcrystalline phases 30–50 and 200–500 µm thick of calcium oxalate mono-(whewellite) or dihydrate (weddellite), on marble and biomicrite samples, respectively, after treatment with AmEtOx 5% and 12% w/w aqueous solutions. As a result, a reduction in the porosity of the stone samples and an enhancement of their cohesion are observed. DFT calculations, carried out to investigate the hydrolysis reaction leading from AmEtOx to AmOx, showed that the localization of the Lowest Unoccupied Molecular Orbital (LUMO) and the natural charge distribution account nicely for the tendency to hydrolyse observed experimentally, eventually leading to the formation of whewellite and weddellite on the stone surface.
CitationGimeno, D. [et al.]. Ammonium monoethyloxalate (AmEtOx): a new agent for the conservation of carbonate stone substrates. "New journal of chemistry", 2021, 
URIhttp://hdl.handle.net/2117/340096
DOI10.1039/D0NJ06001A
ISSN1144-0546
Publisher versionhttps://pubs.rsc.org/en/Content/ArticleLanding/2021/NJ/D0NJ06001A#!divAbstract
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