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Your search keyword '"G. NASSISI"' showing total 2 results
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2 results on '"G. NASSISI"'

1. Analysis of selective laser cleaning of patina in bronze coins

Author

NASSISI, Vincenzo, BUCCOLIERI, Giovanni, LORUSSO, ANTONELLA, BUCCOLIERI, ALESSANDRO, CASTELLANO, Alfredo, LEO, LAURA SANDRA, DI GIULIO, Massimo, L. TORRISI, G. NASSISI, G. Bonizzoni, Nassisi, Vincenzo, Buccolieri, Giovanni, Lorusso, Antonella, Buccolieri, Alessandro, Castellano, Alfredo, L., Torrisi, Leo, LAURA SANDRA, G., Nassisi, and DI GIULIO, Massimo

Subjects
patina, bronze coin, laser cleaning
Published
2006

2. Selective Laser Cleaning of Chlorine on Ancient Coins

Author

Vincenzo Nassisi, Gloria Nassisi, Giovanni Buccolieri, Antonella Lorusso, Domenico Aiello, Alessandro Buccolieri, Massimo Di Giulio, Laura S. Leo, Lorenzo Torrisi, Alfredo Castellano, D., Aiello, Buccolieri, Alessandro, Buccolieri, Giovanni, Castellano, Alfredo, DI GIULIO, Massimo, Leo, LAURA SANDRA, Lorusso, Antonella, G., Nassisi, Nassisi, Vincenzo, L., Torrisi, Schuocker, D, Aiello D., Buccolieri A., Buccolieri G., Castellano A., Di Giulio M., Leo L.S., Lorusso A., Nassisi G., Nassisi V., and Torrisi L.

Subjects
Materials science, medicine.medical_treatment, ancient coin, Analytical chemistry, chemistry.chemical_element, Corrosion, law.invention, law, EDXRF portable apparatu, medicine, Chlorine, otorhinolaryngologic diseases, laser cleaning, Chemical composition, patina, Excimer laser, Laser cleaning, copper chloride, Patina, Laser, Copper, Ancient coin, stomatognathic diseases, chemistry, X-ray crystallography, Copper chloride, EDXRF portable apparatus, Luminescence
Abstract

Results about the efficiency of the laser cleaning on the reduction of corrosion products from the surface of ancient coins are reported. In this work an ancient copper coin datable from 1500 to 1600 A.D. and a UV excimer laser were utilized. The goal of this work consists to study the potentiality of UV laser treatment in the reduction of the chlorine concentration on the coin surface which is the main responsible of the corrosion processes of the ancient coins. We used Energy Dispersive X-Ray Fluorescence (EDXRF) and X-Ray Diffraction (XRD) techniques to estimate the chemical composition of the coin surface, before and after UV excimer laser cleaning. In particular, we measured the chlorine, copper and calcium concentrations. We found that a radiation dose of about 19 J/cm 2 was able to reduce the chlorine concentration from 2.3 % w/w to 0.6 % w/w without damaging the metal bulk. Keywords: ancient coins; patina ; copper chlorides; laser cleaning; EDXRF portable apparatus

Published
2007

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