RT Journal Article
T1 IR irradiation to remove a sub-aerial biofilm from granitic stones using two different laser systems: An Nd: YAG (1064 nm) and an Er:YAG (2940 nm)
A1 Barreiro Castro, Pablo
A1 González Fernández, Pío Manuel
A1 Pozo Antonio, José Santiago
K1 3312 Tecnología de Materiales
K1 2299 Otras Especialidades Físicas
AB A sub-aerial biofilm (SAB) developed on a granite commonly found in the built cultural heritage of the NW Iberian Peninsula was extracted with 2 different IR irradiations using an Nd:YAG laser at 1064 nm and an Er:YAG laser at 2940 nm. The methodology was based on the application of only one scan in order to evaluate the effect of the laser cleaning operated by applying different consecutive laser scanning and the suitability of these lasers as quick tools. The aim of this comparative study was twofold. The first goal was to find the most satisfactory level of extraction by comparing the results obtained by the different laser sources (IR wavelengths). The other aim was to investigate the by-effects induced by both lasers on each granite-forming mineral. Evaluations were made using stereomicroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy and scanning electron microscopy with energy-dispersive x-ray spectroscopy. The results were interpreted in terms of SAB extraction and damage induced on the granite. The results showed that the Nd:YAG laser achieved the most successful level of cleaning, because it extracted the most SAB, while causing the least amount of damage to the surfaces. Regardless of the fluence applied, the Er:YAG laser did not completely extract the SAB in only one scan; in addition, a more intense melting of biotite grains was found, producing amorphous fusion crusts and losing the distinction of the cleavage planes.
PB Science of The Total Environment
SN 00489697
YR 2019
FD 2019-10-20
LK http://hdl.handle.net/11093/7138
UL http://hdl.handle.net/11093/7138
LA eng
NO Science of The Total Environment, (688): 632-641 (2019)
NO Agencia Estatal de Investigación | Ref. IJCI-2017-32771
DS Investigo
RD 17-sep-2024