Pentelic marbles from Basilica Neptuni in Rome-Italy (27-25 BC) show the signs of deterioration phenomena, which can be identified as black crust as well as black and grey patina. The present study has the twofold objective of assessing the entity of the deterioration and proposing new cleaning strategies based on nano- biotechnologies. The former is achieved by performing optical microscopy, Differential Interferential Contrast (DIC), stereomicroscopy, Scanning Electron Microscopy/Energy Dispersive X-Ray analysis (SEM/EDX) and Infra-red Fourier Transform spectroscopy (FT-IR) analysis. The latter involves different treatments with carbon nano materialss and the biocatalysts glucose oxidase (–GOD) and lipase. Nanomicelles assembled with carbon nano-fibers and dispersed in Tween20 medium show the highest efficiency in the removal of the black crust while preserving the protective inner gypsum layer or “patina nobile”. The GOD- based biocleaning is efficient in removing the grey and dark patina, but works slow on the black crust. Finally, the lipase based cleaning approach is efficient in the black patina removal, though at the working temperature of 38°C.
Valentini, F., Diamanti, A., Carbone, M., Palleschi, G. (2010). New cleaning strategies based on Biotechnology Carbon Nanomaterials of the black crust on mable substrata. In Diagnosis for the conservation and valorization of cultural heritage (pp.158-171).
New cleaning strategies based on Biotechnology Carbon Nanomaterials of the black crust on mable substrata
VALENTINI, FEDERICA;CARBONE, MARILENA;PALLESCHI, GIUSEPPE
2010-01-01
Abstract
Pentelic marbles from Basilica Neptuni in Rome-Italy (27-25 BC) show the signs of deterioration phenomena, which can be identified as black crust as well as black and grey patina. The present study has the twofold objective of assessing the entity of the deterioration and proposing new cleaning strategies based on nano- biotechnologies. The former is achieved by performing optical microscopy, Differential Interferential Contrast (DIC), stereomicroscopy, Scanning Electron Microscopy/Energy Dispersive X-Ray analysis (SEM/EDX) and Infra-red Fourier Transform spectroscopy (FT-IR) analysis. The latter involves different treatments with carbon nano materialss and the biocatalysts glucose oxidase (–GOD) and lipase. Nanomicelles assembled with carbon nano-fibers and dispersed in Tween20 medium show the highest efficiency in the removal of the black crust while preserving the protective inner gypsum layer or “patina nobile”. The GOD- based biocleaning is efficient in removing the grey and dark patina, but works slow on the black crust. Finally, the lipase based cleaning approach is efficient in the black patina removal, though at the working temperature of 38°C.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
