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Ammonium oxalate treatment: Evaluation by μ-Raman mapping of the penetration depth in different plasters |
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| Authors: | Claudia Conti Chiara Colombo David Dellasega Mauro Matteini Marco Realini Giuseppe Zerbi |
| Institution: | aIstituto per la Conservazione e la Valorizzazione dei Beni Culturali, CNR, via Cozzi 53, 20125 Milano, Italy;bDip. Energia, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy;cAlma Mater Studiorum, Università di Bologna, via Zamboni 33, 40126 Bologna, Italy;dDip. Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy |
| Abstract: | This study is focused on the evaluation by μRaman mapping of the penetration depth achieved by ammonium oxalate treatment in different plaster specimens, a hot issue in the conservation field. The role of the carbonatic aggregate particles and the influence of the different variables of the treatment on the penetration depth and on the distribution of the newly-formed phase (whewellite) have been ascertained. Based on the results of μRaman mapping, analyses with Field Emission Scanning Electron Microscopy have been carried out in order to observe the whewellite crystals and the carbonatic aggregate particles involved in the reaction with ammonium oxalate. |
| Keywords: | Plaster μ-Raman mapping Penetration depth Ammonium oxalate Whewellite |
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