Oxamate salts as novel agents for the restoration of marble and limestone substrates : case study of ammonium N-phenyloxamate
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The ammonium salt of N-phenyloxamic acid (AmPhOxam) was synthesised, characterised by FT-IR, FT-Raman, UV-Vis, 1H-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.
Maiore , L , Aragoni , M C , Carcangiu , G , Cocco , O , Isaia , F , Lippolis , V , Meloni , P , Murru , A , Slawin , A M Z , Tuveri , E , Woollins , J D & Arca , M 2016 , ' Oxamate salts as novel agents for the restoration of marble and limestone substrates : case study of ammonium N-phenyloxamate ' New Journal of Chemistry , vol 40 , no. 3 , pp. 2768-2774 . DOI: 10.1039/C5NJ02505B
New Journal of Chemistry
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