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AFM and pulsed laser ablation methods for Cultural Heritage: application to archeometric analysis of stone artifacts

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Abstract

In this paper, we introduce the use of the atomic force microscope (AFM) and of the pulsed laser ablation as methods for morphological diagnostic with nanoscale precision of archeological artifacts and corrosive patina removal from stone artifacts. We test our methodology on stone artifacts extracted from the Church of Sotterra (located in Calabria, South Italy). The AFM microscopy was compared with different petrographic, chemical, optical and morphological analysis methods for identifying the textural characteristics, evaluating the state of preservation and formulating some hypotheses about the provenance and composition of the impurity patina located on the artifact surfaces. We demonstrate that with the nanometric precision obtained with AFM microscopy, it is possible to distinguish the different states of preservation, much better than using conventional petrographic methods. The surface’s roughness is evaluated from very small artifact’s fragments, reducing the coring at micrometric scale with a minimal damage to the artworks. After the diagnosis, we performed restoration tests using the pulsed laser ablation (PLA) method and compared it with the more common micro-sandblasting under dry conditions. We find that the PLA is highly effective for the removal of the surficial patina, with a control of a few hundreds of nanometers in the cleaning of surface, without introducing chemical or morphological damages to the artifacts. Moreover, PLA can be easily implemented in underwater conditions; this has the great advantage that stone and pottery artifacts for marine archeological sites do not need to be removed from the site.

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Acknowledgments

The authors thank the Rector of Sotterra Church for the access to Church and the possibility to take the samples for analysis. This work is financially supported by the European Project PON 042a_ Comas, FRQNT/FRQSC (Grant No. 174726), CRSNG decouverte (Grant No. 435416), NSERC (Grant No. 435416) and ComputeCanada (Job: pve-323-ac, P. Antici). MB is supported by Regional Operative Program (ROP) Calabria ESF 2007/2013—IV Axis Human Capital—Operative Objective M2, ARUE-Project CMN.

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Authors and Affiliations

  1. EMT Research Center, Institut National de la Recherche Scientifique (INRS), 1650 Boul. Lionel-Boulet, Varennes, QC, J3X 1S2, Canada

    S. Veltri & P. Antici

  2. Biology, Ecology and Earth Science Department, University of Calabria and INFN Italy, Via Bucci 4B, 87036, Rende, CS, Italy

    M. Barberio, F. Stranges, A. Bonanno & F. Xu

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  1. M. Barberio
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  2. S. Veltri
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  3. F. Stranges
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  4. A. Bonanno
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  5. F. Xu
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  6. P. Antici
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Correspondence to M. Barberio.

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Barberio, M., Veltri, S., Stranges, F. et al. AFM and pulsed laser ablation methods for Cultural Heritage: application to archeometric analysis of stone artifacts. Appl. Phys. A 120, 909–916 (2015). https://doi.org/10.1007/s00339-015-9225-x

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  • DOI: https://doi.org/10.1007/s00339-015-9225-x

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