Analytical Study of the Chemical and Physical Changes Induced by KrF Laser Cleaning of Tempera Paints

Castillejo, Marta; Martı́n, Margarita; Oujja, M.; Silva, Diego Augusto Santos; Torres, Ricardo; Manousaki, A.; Zafiropulos, Vassilis; Brink, Oscar F. van den; Heeren, Ron M. A.; Teule, Rianne; Silva, Alberto; Gouveia, Helena

doi:10.1021/ac025778c

Cited by 80 publications

(60 citation statements)

References 28 publications

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“…Castillejo et al 277 reported a study on the chemical and physical changes induced by a KrF excimer laser at 248 nm on tempera paint dosimeter systems. The changes were evaluated by using a range of analytical techniques.…”

Section: Libs For Monitoring Cleaning Processes Of Art Artifactsmentioning

confidence: 99%

Laser Induced Breakdown Spectroscopy

Pasquini¹,

Cortez²,

Silva³

et al. 2007

J. Braz. Chem. Soc.

342

195

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Esta revisão descreve os aspectos fundamentais, a instrumentação, as aplicações e tendências futuras de uma técnica analítica que se encontra em seu estágio de consolidação e que está em vias de estabelecer o seu nicho entre as técnicas espectrofotométricas modernas. A técnica é denominada Espectroscopia de Emissão em Plasma Induzido por Laser (em inglês, Laser Induced Breakdown Spectroscopy, LIBS) e sua principal característica está no uso de pulsos de laser como fonte de energia para vaporizar a amostra e excitar a emissão de radiação eletromagnética, a partir de seus elementos e/ou fragmentos moleculares. A radiação emitida é analisada por meio de instrumentos ópticos de alta resolução e as suas intensidades são medidas, usualmente com detectores rápidos de estado sólido. Em conjunto, esses dispositivos permitem a geração e a medida de um espectro de emissão de faixa ampla do fenômeno induzido pelo pulso de laser. O espectro registrado contém informação qualitativa e quantitativa que pode ser correlacionada com a identidade da amostra ou empregada na determinação da quantidade de seus constituintes. Essa revisão é dividida em quatro partes. A primeira aborda aspectos históricos da técnica e os conceitos teóricos relevantes associados com LIBS; então, os aspectos práticos de diversas abordagens experimentais e instrumentais empregadas na implementação da técnica são revistos de forma crítica; as aplicações encontradas na literatura, incluindo aquelas que empregam quimiometria, são classificadas e exemplificadas por meio de trabalhos relevantes recentemente publicados. Finalmente, uma tentativa de estabelecer uma avaliação global e as perspectivas futuras para a técnica é apresentada.This review describes the fundamentals, instrumentation, applications and future trends of an analytical technique that is in its early stages of consolidation and is establishing its definitive niches among modern spectrometric techniques. The technique has been named Laser Induced Breakdown Spectroscopy (LIBS) and its main characteristic stands in the use of short laser pulses as the energy source to vaporize samples and excite the emission of electromagnetic radiation from its elements and/or molecular fragments. The emitted radiation is analyzed by high resolution optics and the intensities are recorded, usually by fast triggered solid state detectors. Together, these devices allow producing and registering a wide ranging emission spectrum of the short-lived phenomenon induced by the laser pulse. The spectrum contains qualitative and quantitative information which can be correlated with sample identity or can be used to determine the amount of its constituents. This review is divided in four parts. First, the relevant historical and theoretical concepts associated with LIBS are presented; then the main practical aspects of the several experimental and instrumental approaches employed for implementation of the technique are critically described; the applications related in the literature, including those making use of chemometri...

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Section: Libs For Monitoring Cleaning Processes Of Art Artifactsmentioning

confidence: 99%

Laser Induced Breakdown Spectroscopy

Pasquini¹,

Cortez²,

Silva³

et al. 2007

J. Braz. Chem. Soc.

342

195

View full text Add to dashboard Cite

show abstract

“…The sensitivity of most pigments to the direct exposure to laser irradiation is an important issue, which requires careful study and thorough approach. Relevant research [12][13][14][15][16] has pointed out that darkening or, in the worst case scenario, blackening of painted surfaces is a material related alteration which occurs upon direct exposure to laser radiation. Although initially it was believed that such undesired alteration is irrelevant to the binding medium as it affects both paints and pigments in raw form, recent studies on the basis of different ablative methodologies using lasers of various wavelengths and pulse durations, proved that the presence of a binding media that absorbs highly the employed laser wavelength may safeguard the pigment itself [16].…”

Section: The Two-wavelength Cleaning Methodology; Background Informatmentioning

confidence: 99%

The two-wavelength laser cleaning methodology; theoretical background and examples from its application on CH objects and monuments with emphasis to the Athens Acropolis sculptures

et al. 2016

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The two-wavelength laser cleaning methodology has been introduced and developed in order to meet demanding cleaning challenges in CH. The innovation lies on the combined use of two laser beams, allowing thus control of the laser ablation effective regimes towards an efficient and safe cleaning result. A series of studies on technical samples and real fragments aimed at defining and refining this methodology in order to ensure that the original surface, including its details and historic traces, will be safeguarded. In this paper related research and applications will be presented in an attempt to enlighten the associated laser ablation processes, as well as the potential cleaning applications in CH field. Laser-assisted removal of pollution accumulations from the Athens Acropolis monuments and sculptures is a unique highlight on the use of this methodology in practice. IESL-FORTH in collaboration with the Acropolis Restoration Service and the Acropolis Museum has developed an innovative cleaning methodology and a prototype laser cleaning system, which since 2002 have been introduced to the everyday conservation practice and will be presented in this paper.

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“…Other non-destructive laser spectroscopies such as laser induced fluorescence (LIF) and Raman are widely used in the analysis of cultural heritage substrates. LIF is a sensitive technique, shown in several cases to be useful for identifying differences in organic and inorganic substrates on the basis of their characteristic molecular emission bands [12][13][14][15][16][17][18]. Svanberg et al [19] have used a portable LIF system to detect surface treatments and biodeterioration layers on the stone façades of historical buildings.…”

Section: Introductionmentioning

confidence: 99%

“…Svanberg et al [19] have used a portable LIF system to detect surface treatments and biodeterioration layers on the stone façades of historical buildings. Due to the difficulties associated to the full identification of materials by LIF, this technique is often used in combination with other spectroscopies such as Raman, as the later can provide highly specific information on molecular composition that is complementary to the data obtained by LIF [13][14][15]18]. In particular, Fouriertransform Raman spectroscopy (FT-Raman) overcomes the difficulties associated with the sometimes intense background fluorescence that accompanies the Raman signal [20].…”

Section: Introductionmentioning

confidence: 99%