Excimer laser cleaning of mold-contaminated paper: Sterilization and air quality considerations

Friberg, Thomas R.; Zafiropulos, V.; Kalaitzaki, M.; Kowalski, Regis P.; Petrakis, J.; Fotakis, C.

doi:10.1007/bf02763922

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…Fungal contamination plays a considerable role in the deterioration of book heritage, catalyzing the decomposition of cellulose and of some related polysaccharides [ 21 ]. In this respect, laser cleaning technology has some advantages over conventional cleaning methods, being a contactless and chemical-free technique [ 22 ]. To study the best operating conditions for cleaning the paper surface, in 1997 an EUREKA-EUROCARE project entitled “Laser Cleaning of Paper and Parchment” (“LACLEPA”; European Union Project Number 1681) was launched.…”

Section: Resultsmentioning

confidence: 99%

“…Although it was demonstrated that radiation of 308 nm or less is not suitable for the cleaning of cellulose-based materials, as they may have a detrimental effect on the paper surface, an excimer laser at 248 nm was used to sterilize fungal-contaminated paper [ 22 ]. The laser removal of fungi was successful, and suitable parameters that do not alter the paper structure were found, but the plasma cloud produced by laser on the paper surface may contain viable organisms, and precautions should be taken to avoid contamination of the workroom.…”

Section: Resultsmentioning

confidence: 99%

“…The laser removal of fungi was successful, and suitable parameters that do not alter the paper structure were found, but the plasma cloud produced by laser on the paper surface may contain viable organisms, and precautions should be taken to avoid contamination of the workroom. For this reason, it was suggested that the cleaning process should be performed in an enclosed space, with a vacuum purge [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Monitoring of Cleaning Treatments for Paper Heritage with Raman Spectroscopy Mapping

Botti,

Bonfigli,

Mezi

et al. 2023

Molecules

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In the field of book heritage, it is important to develop cleaning/disinfecting treatments that can slow down the degradation of paper to prevent evident and irreversible damage. The objectives of the cleaning treatments are to remove external contaminants and oxidation and decomposition products of the paper, but these processes must not modify the unique characteristics of the book heritage resulting in irreversible changes in the structure of the paper. Recently, several innovative cleaning treatments were developed with the aim of being minimally invasive; however, to assess the effect of these treatments on paper, it is necessary to use a diagnostic non-destructive, rapid, and affordable process. In previous work, we used surface scanning Raman spectroscopy to develop a diagnostic protocol able to follow the aging processes of the paper, discriminating between hydrolysis and oxidation. In this paper, we applied this protocol to study the action of different types of treatments (hydrogel and EUV irradiation), evaluating both their effectiveness and impact on paper parameters. The results reported here demonstrate that the developed in operando diagnostic procedure can follow the changes in the paper structure comparing them to the variability due to the intrinsic inhomogeneity of paper, without sample contact in a rapid and effective way.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Monitoring of Cleaning Treatments for Paper Heritage with Raman Spectroscopy Mapping

Botti,

Bonfigli,

Mezi

et al. 2023

Molecules

View full text Add to dashboard Cite

show abstract

“…During the "early phase" of the application of laser cleaning, excimer lasers played an important role, e.g., for the restoration of paintings [110] and the processing of organic materials such as parchment [111] and paper [112]. However, the high photon energies of UV emitting lasers can lead to photochemical degradation of the cleaned objects [113] that often must be prevented.…”

Section: 21)mentioning

confidence: 99%

Structuring of thin films by ultrashort laser pulses

Krüger

2022

Appl. Phys. A

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Modern life and global communication would not be possible without technologically tailored thin films; they are omnipresent in daily life applications. In most cases, the films are deposited entirely at the carrying substrates in a specific processing step of the device or sample. In some cases, however, removal or modification must be performed locally, i.e., site-controlled and material selective through an additional laser processing step. For that ultrashort laser pulses with durations in the femtosecond and picosecond range can provide unique advantages and capabilities in industrially scalable schemes. This article reviews the current state of the research and corresponding industrial transfer related to the structuring of thin films by ultrashort pulsed lasers. It focuses on the pertinent historic developments, reveals the relevant physical and chemical effects, explores the ultimate limits, and discusses selected industrial and scientific applications.

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“…There are very rare reports on the removal of fungi from paper by lasers [3,4]. A far-UV krypton fluoride (KrF) excimer laser was able to remove Aspergillus niger mould from filter paper while viable spores and mould fragments were released into the atmosphere [5]. Actually UVB radiation of a 308 nm XeCl excimer laser can be used for the treatment of skin mycosis fungoides [6].…”

Section: Introductionmentioning

confidence: 99%

Anti-Fungal Laser Treatment of Paper: A Model Study with a Laser Wavelength of 532 nm

Pilch¹,

Pentzien

Mädebach

et al.

Springer Proceedings in Physics

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Biodeterioration of organic cultural heritage materials is a common problem. Particularly the removal of discoloration caused by fungal pigments is yet an unsolved problem in paper conservation. In the present study, cellulose (cotton and linters) and 16th century paper (rag), were incubated with several fungi types, such as Cladosporium, Epicoccum, Alternaria, Chaetomium, Aspergillus, Trichophyton, and Penicillium on agar for three weeks. Then they were immersed in 70% Ethanol for removal of hyphae and mycelia and deactivation of the remaining conidia. These specimens were laser-treated in a computer-controlled laser cleaning system with a high pulse energy diode pumped Q-switched Nd:YAG laser operating at 532 nm and a pulse duration of 8 ns. Colour differences were determined spectrophotometrically. Best cleaning results were observed with fungi such as Penicillium and Alternaria. Dry laser cleaning generally turned out to be superb over wet bleaching approaches.

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Excimer laser cleaning of mold-contaminated paper: Sterilization and air quality considerations

Cited by 11 publications

References 5 publications

Monitoring of Cleaning Treatments for Paper Heritage with Raman Spectroscopy Mapping

Monitoring of Cleaning Treatments for Paper Heritage with Raman Spectroscopy Mapping

Structuring of thin films by ultrashort laser pulses

Anti-Fungal Laser Treatment of Paper: A Model Study with a Laser Wavelength of 532 nm

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