Oxamate salts as novel agents for the restoration of marble and limestone substrates: case study of ammonium N-phenyloxamate. (28th January 2016)

• Record Type: Journal Article
• Authors: Maiore, Laura; Aragoni, M. Carla; Carcangiu, Gianfranco; Cocco, Ombretta; Isaia, Francesco; Lippolis, Vito; Meloni, Paola; Murru, Arianna; Slawin, Alexandra M. Z.; Tuveri, Enrica; Woollins, J. Derek; Arca, Massimiliano
• Is Part Of: New journal of chemistry. Volume 40:Number 3(2016:Mar.)
• Page Start: 2768
• Page End: 2774
• Publication Date: 2016-01-28
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c5nj02505b
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : The treatment of calcareous stone substrates, such as weathered marble and biomicritic limestone, with ammonium N -phenyloxamate results in the deposition of the corresponding monohydrated calcium salt. Abstract : The ammonium salt of N -phenyloxamic acid (AmPhOxam) was synthesised, characterised by FT-IR, FT-Raman, UV-Vis, 1 H-NMR spectroscopic methods and single crystal X-ray diffraction, and evaluated as a protective and consolidating agent for calcareous stone substrates under mild conditions. Hydro-alcoholic solutions of AmPhOxam were tested for the treatment of naturally weathered white marble and biomicritic limestone. Mercury intrusion porosimetry, FT-NIR spectroscopy measurements and SEM microscopy showed the formation of a superficial protective layer of crystals of the corresponding monohydrated calcium salt, CaPhOxam, on both treated stones.