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Assessment of laser treatment on dolostones colonized by microorganisms and lichens

AuthorsÁlvarez de Buergo, Mónica ; Gómez-Heras, Miguel ; Fort González, Rafael ; Ascaso, Carmen ; Ríos, Asunción de los ; Pérez-Ortega, Sergio; Speranza, Mariela ; Wierzchos, Jacek ; Sanz, Mikel ; Oujja, M. ; Castillejo, Marta
Issue Date2013
PublisherCRC Press
CitationScience and Technology for the Conservation of Cultural Heritage: 173–178
AbstractThe preliminary results of the laser assessment for biofilms removal on rock surfaces are shown. The procedure consisted of laser irradiation (Nd:YAG, 1064nm, 10 ns, 200 mJ) on a dolostone colonized by microorganisms (mainly cyanobacteria) and lichens. Samples were taken to assess the effectiveness of laser treatment on both the lichens thalli and microbial communities (SEM-BSE and TEM), and also on the stone substrate (SEM-SE+EDS). The re-sults show that lichen thalli were eliminated only partially. The laser fluence applied was not enough to efficiently eliminate and/or damage the majority of lichen thalli, which is in accor-dance with previous laboratory results, where it was demonstrated that a higher fluence is nec-essary to clean and make inactive lichen symbionts. No damage was found in the dolomite crys-tals after laser radiation. Roughness and color were recorded before and after laser treatment. Continuous monitoring of the thermal processes during laser irradiation showed that thermal gradient is extremely high
Identifiersdoi: 10.1201/b15577-41
isbn: 978-1-138-00009-4
Appears in Collections:(MNCN) Libros y partes de libros
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