The characterization of consolidating products formed by conservation treatments within Cultural Heritage (CH) materials is a burning issue and an analytical challenge, as non-destructive approaches, phase analysis, and volume distribution analysis are simultaneously required. This paper proposes the use of synchrotron X-ray diffraction computed tomography (XRDCT) to non-destructively study diammonium hydrogen phosphate (DAP) consolidating treatments for stone conservation. The mineralogical composition and localization of crystalline phases formed in a complex mixture have been explored and spatially resolved. The coexistence of hydroxyapatite and octacalcium phosphate has been finally demonstrated. The image analysis highlights the 3D distribution of calcium phosphates, their arrangement in a binding network down to the voxel scale, and their consolidating action. Above all, this study demonstrates the feasibility and high potential of XRDCT to investigate the interactions of conservation treatments with CH stone materials, and opens new analytical perspectives for XRDCT in conservation science and materials science.

Synchrotron X-ray diffraction computed tomography to non-destructively study inorganic treatments for stone conservation / E. Possenti, C. Conti, G.D. Gatta, N. Marinoni, M. Merlini, M. Realini, G.B.M. Vaughan, C. Colombo. - In: ISCIENCE. - ISSN 2589-0042. - 25:10(2022 Oct 21), pp. 105112.1-105112.13. [10.1016/j.isci.2022.105112]

Synchrotron X-ray diffraction computed tomography to non-destructively study inorganic treatments for stone conservation

G.D. Gatta
Writing – Review & Editing
;
N. Marinoni
Methodology
;
M. Merlini
Methodology
;
2022

Abstract

The characterization of consolidating products formed by conservation treatments within Cultural Heritage (CH) materials is a burning issue and an analytical challenge, as non-destructive approaches, phase analysis, and volume distribution analysis are simultaneously required. This paper proposes the use of synchrotron X-ray diffraction computed tomography (XRDCT) to non-destructively study diammonium hydrogen phosphate (DAP) consolidating treatments for stone conservation. The mineralogical composition and localization of crystalline phases formed in a complex mixture have been explored and spatially resolved. The coexistence of hydroxyapatite and octacalcium phosphate has been finally demonstrated. The image analysis highlights the 3D distribution of calcium phosphates, their arrangement in a binding network down to the voxel scale, and their consolidating action. Above all, this study demonstrates the feasibility and high potential of XRDCT to investigate the interactions of conservation treatments with CH stone materials, and opens new analytical perspectives for XRDCT in conservation science and materials science.
Cultural Heritage; consolidating treatments; diammoniumhydrogen phosphate; Synchrotron radiation; X-ray diffraction computed tomography
Settore GEO/09 - Georisorse Miner.Appl.Mineral.-Petrogr.per l'amb.e i Beni Cul
https://www.sciencedirect.com/science/article/pii/S2589004222013840
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/943506
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