Nanomaterials in art conservation

Baglioni, Piero; Carretti, Emiliano; Chelazzi, David

doi:10.1038/nnano.2015.38

Cited by 154 publications

(121 citation statements)

References 23 publications

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“…Alongside DAP, also ammonium dihydrogen phosphate (ADP) and ammonium phosphate (AP) have been investigated as precursors [9,10]. However, since the main difference between these phosphate salts is their speciation in PO 4 3-, HPO 4 2-and H 2 PO 4 -ions and since the relative amount of these species actually depends on the solution pH, the nature of the phosphate precursor is basically irrelevant, as long as the pH of the phosphate solution is controlled [9].  pH of the phosphate solution.…”

Section: Treatment Conditionsmentioning

confidence: 99%

“…DAP concentrations ranging from 0.1 M [9,11] up to 3 M (close to saturation) have been explored [7,12]. The motivation to use highly concentrated solution is that only a minor fraction (<1%) of ions originated from DAP dissociation are PO 4 3-ions (needed to form HAP), whereas the largest part is in the form of HPO 4 2- [9]. However, when highly concentrated DAP solutions are used, the formed calcium phosphate films tend to crack because of an excessive thickness.…”

Section: Treatment Conditionsmentioning

confidence: 99%

“…However, organic products (e.g. acrylic resins) generally lack compatibility and durability, because they dramatically alter stone transport properties and they are highly sensitivity to UV, temperature variations and biodeterioration [4]. Inorganic products (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Phosphate-based treatments for conservation of stone

Sassoni

2017

RILEM Tech Lett

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To overcome the limitations of currently available protectives and consolidants for carbonate stones (such as marble and limestone), in 2011 the use of calcium phosphate was proposed. The idea is forming calcium phosphates (ideally hydroxyapatite) as the reaction product between the substrate and an aqueous solution of a phosphate salt that the stone is treated with. In this paper, the studies aimed at identifying the best treatment conditions (in terms of nature and concentration of the phosphate precursor, solution pH, reaction time, ionic and organic additions) are first briefly summarized. Then, the efficacy of the phosphate treatment in protecting marble from dissolution in rain and restoring cohesion of weathered marble and limestone is discussed. Some recent studies on the use of the phosphate treatment on alternative substrates and some future steps for research on the topic are finally outlined.

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Section: Treatment Conditionsmentioning

confidence: 99%

Section: Treatment Conditionsmentioning

confidence: 99%

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Phosphate-based treatments for conservation of stone

Sassoni

2017

RILEM Tech Lett

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“…Gels have been used for years in conservation to remove surface contamination from works of art in a localized and selective way. A gel confines the action of a solvent or cleaning agent to the area of the object with which it is in contact, preventing the spread of any material-either the cleaning agents or the materials targeted for removal-through and across the artwork (Carretti et al 2010;Baglioni et al 2015). For SERS applications, a gel could substitute the colloid drop traditionally used as the medium for the target dye and the plasmonic nanoparticles to interact; alternatively, a gel loaded with appropriate reagents could be used to perform a mild extraction of the target analyte from its substrate, for subsequent analysis with a silver colloid deposited on the gel.…”

Section: Detachable Sers Substratesmentioning

confidence: 99%

Surface-Enhanced Raman Spectroscopy: Using Nanoparticles to Detect Trace Amounts of Colorants in Works of Art

Pozzi

Zaleski

Casadio

et al. 2016

Nanoscience and Cultural Heritage

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In recent years, powerful physical processes occurring in the vicinity of nanoscale metal surfaces have been exploited in the art world for the detection of trace amounts of colorants with surface-enhanced Raman spectroscopy (SERS). With this technique, naturally occurring and man-made organic molecules used as dyes and pigments in objects from antiquity to the present day are being detected with high molecular specificity and unprecedented sensitivity. This chapter reviews the broad spectrum of SERS analytical methodologies and instrumental improvements that have been developed over the years in the field of cultural heritage science, and discusses significant case studies within different types of works of art and archaeological artifacts.

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“…), and their low solvent content reduces the environmental impact. In fact, throughout the last decade, nanostructured fluids have been widely tested for the cleaning of mural paintings, and the results obtained have demonstrated that these systems are a valid alternative to the use of neat solvents [8][9][10][11]. However, for their use on watersensitive substrates, o/w microemulsions must be confined within a retentive network that allows their controlled release, so as to grant the removal of unwanted layers without excessive wetting of the surface.…”

Section: Introductionmentioning

confidence: 99%

Nanomaterials for the cleaning and pH adjustment of vegetable-tanned leather

et al. 2016

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Leather artifacts in historical collections and archives are often contaminated by physical changes such as soiling, which alter their appearance and readability, and by chemical changes which occur on aging and give rise to excessive proportion of acids that promote hydrolysis of collagen, eventually leading to gelatinization and loss of mechanical properties. However, both cleaning and pH adjustment of vegetable-tanned leather pose a great challenge for conservators, owing to the sensitivity of these materials to the action of solvents, especially water-based formulations and alkaline chemicals. In this study, the cleaning of historical leather samples was optimized by confining an oil-in-water nanostructured fluid in a highly retentive chemical hydrogel, which allows the controlled release of the cleaning fluid on sensitive surfaces. The chemical gel exhibits optimal viscoelasticity, which facilitates its removal after the application without leaving residues on the object. Nanoparticles of calcium hydroxide and lactate, dispersed in 2-propanol, were used to adjust the pH up to the natural value of leather, preventing too high alkalinity which causes swelling of fibers and denaturation of the collagen. The treated samples were characterized using scanning electron microscopy, controlled environment dynamic mechanical analysis, and infrared spectroscopy. The analytical assessment validated the use of tools derived from colloid and materials science for the preservation of collagen-based artifacts.

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Nanomaterials in art conservation

Abstract: Tackling the degradation of cultural heritage requires a global effort. We call on all material scientists to develop new nanomaterials and methods for the preservation of artwork.

Cited by 154 publications

References 23 publications

Phosphate-based treatments for conservation of stone

Phosphate-based treatments for conservation of stone

Surface-Enhanced Raman Spectroscopy: Using Nanoparticles to Detect Trace Amounts of Colorants in Works of Art

Nanomaterials for the cleaning and pH adjustment of vegetable-tanned leather

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