Nd:YAG and Er:YAG laser cleaning to remove Circinaria hoffmanniana (Lichenes, Ascomycota) from schist located in the Côa Valley Archaeological Park

Pozo-António, J.S.; Barreiro, P.; González, P.; Paz-Bermúdez, Graciela

doi:10.1016/j.ibiod.2019.104748

Cited by 17 publications

(13 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the last decade, this technique has been amply studied on outdoor stone surfaces due to its advantages over traditional cleaning methods: it is controllable, selective, contactless, and environmentally friendly [ 67 , 68 ]. The main drawback is that every study case needs to be optimized.…”

Section: Physical Methodsmentioning

confidence: 99%

“…The lichen Circinaria hoffmanniana was removed from schist collected from the Côa Valley Archaeological Park (Portugal) using two different laser systems working in the IR regime: an Nd:YAG laser at 1064 nm and an Er:YAG laser at 2940 nm, with different pulse durations [ 67 ]. The results indicated that both lasers, Nd:YAG and an Er:YAG, damaged the lichen structure without completely extracting the microorganisms.…”

Section: Physical Methodsmentioning

confidence: 99%

See 1 more Smart Citation

The Control of Cultural Heritage Microbial Deterioration

2020

View full text Add to dashboard Cite

The microbial deterioration of cultural heritage includes physical and chemical damage as well as aesthetic alteration. With the technological advancement, a plethora of techniques for removing unwanted microorganisms have opened up new opportunities for microbiologists and conservators. This article reviews the most applied, up-to-date, and sustainable techniques developed for the control of cultural heritage microbial deterioration presenting noteworthy case studies. These techniques include chemical methods, i.e., traditional biocides and nanoparticles; physical methods, such as mechanical removal, UV irradiation, gamma radiation, laser cleaning, heat shocking, microwaves, and dry ice treatment; and biological methods, such as natural molecules with biocidal activity, enzymes, and microorganisms. The application of control systems requires the comprehension of their behavior toward the unwanted microorganisms and possible interactions with the heritage materials. This overview shows also the control methods drawbacks for the purpose of creating awareness in selecting the most suitable technique or combination of techniques.

show abstract

Section: Physical Methodsmentioning

confidence: 99%

Section: Physical Methodsmentioning

confidence: 99%

The Control of Cultural Heritage Microbial Deterioration

2020

View full text Add to dashboard Cite

show abstract

“…The use of these lasers on objects and monuments has shown promise (Table 1). For instance, laser cleaning is efficient on black removal, including Desulfovibrio desulfuricans (Elhagrassy et al, 2018); Verrucaria nigrescens (Speranza et al, 2013), Circinaria hoffmanniana (Pozo-Antonio et al, 2019). However, their large-scale application has so far been minimal, partly due to the high costs (Di Martino, 2016;Slaton and Normandin, 2005).…”

Section: Mechanical Cleaning Approachesmentioning

confidence: 99%

Current and future chemical treatments to fight biodeterioration of outdoor building materials and associated biofilms: Moving away from ecotoxic and towards efficient, sustainable solutions

Romani

Warscheid

Nicole

et al. 2022

Science of The Total Environment

View full text Add to dashboard Cite

All types of building materials are rapidly colonized by microorganisms, initially through an invisible and then later a visible biofilm that leads to their biodeterioration. Over centuries, this natural phenomenon has been managed using mechanical procedures, oils, or even wax. In modern history, many treatments such as high-pressure cleaners, biocides (mainly isothiazolinones and quaternary ammonium compounds) are commercially available, as well as preventive ones, such as the use of water-repellent coatings in the fabrication process. While all these cleaning techniques offer excellent cost-benefit ratios, their limitations are numerous. Indeed, building materials are often quickly recolonized after application, and microorganisms are increasingly reported as resistant to chemical treatments. Furthermore, many antifouling 5 compounds are ecotoxic, harmful to human health and the environment, and new regulations tend to limit their use and constrain their commercialization. The current state-of-the-art highlights an urgent need to develop innovative antifouling strategies and the widespread use of safe and eco-friendly solutions to biodeterioration. Interestingly, innovative approaches and compounds have recently been identified, including the use of photocatalysts or natural compounds such as essential oils or quorum sensing inhibitors. Most of these solutions developed in laboratory settings appear very promising, although their efficiency and ecotoxicological features remain to be further tested before being widely marketed. This review highlights the complexity of choosing the adequate antifouling compounds when fighting biodeterioration and proposes developing case-to-case innovative strategies to raise this challenge, relying on integrative and multidisciplinary approaches.

show abstract

“…Valuable protocols for the physical removal of lithobionts by laser ablation have been drawn up in the last decade (Sanz et al 2017), but even the combination of scalpel and laser may sometimes fail to eliminate lithobiontic structures within fissures (Rivas et al 2018). Similarly, some laser ablation can cause damage to the mineral surface whilst not completely removing the lichens (Pozo-Antonio et al 2019). As a result of these issues, biocide treatments often precede mechanical removal (Kakakhel et al 2019).…”

Section: Direct and Indirect Strategies To Control Lithobiontsmentioning

confidence: 99%