Chemical semi-IPN hydrogels for the removal of adhesives from canvas paintings

Domingues, Joana; Bonelli, Nicole; Giorgi, Rodorico; Baglioni, Piero

doi:10.1007/s00339-013-8150-0

Cited by 45 publications

(44 citation statements)

References 6 publications

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“…In particular, a semi-IPN of poly(2-hydroxyethyl methacrylate), p(HEMA) and poly(vinylpyrrolidone), PVP, showed higher retentiveness than acrylamide gels, maintaining optimal mechanical properties and biocompatibility, allowing cleaning efficacy not achievable with conventional methods . [21,22] From a rheological point of view, Semi-IPNS behave as solidlike systems with infinite relaxation time. Similarly to sponges, they are able to absorb various fluids and solvents without dramatic changes in their characteristics, and can be easily handled and removed from the artefacts' surface as opposed to traditional thickeners.…”

Section: Accepted Manuscript Angewandte Chemie International Editionmentioning

confidence: 99%

Mikroemulsionen, Micellen und funktionelle Gele: Erhaltung von Kunstwerken mit Kolloiden und weicher Materie

Chelazzi¹,

Giorgi²,

Baglioni³

2018

Angewandte Chemie

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Die Kolloidwissenschaft liefert grundlegende Erkenntnisse für z. B. die pharmazeutische Industrie oder die Wasch‐ und Reinigungsmittel‐, Farb‐ und Nahrungsmittelindustrie. Eine interessante Anwendung ist die Erhaltung von Kunstwerken, die wegen der komplexen Grenzflächenwechselwirkungen, die mit der Restaurierung von Artefakten verbunden sind, eine anspruchsvolle Aufgabe ist. Derzeit ist die Mehrzahl der wirksamsten und umweltverträglichsten Reinigungs‐ und Konsolidierungsmittel für Kunstwerke der weichen Materie und Kolloiden zuzuordnen. Die Entwicklung und Anwendung von immer komplexeren Systemen, von Mikroemulsionen bis zu semi‐interpenetrierenden Hydrogelen, die derartige Flüssigkeiten enthalten, werden in diesem Kurzaufsatz aufgezeigt. Diese Systeme wurden bei verschiedenen Artefakten eingesetzt: von Fresken der Renaissance bis zu Werken von Picasso und Pollock. Chemisches Design kann genutzt werden, um den Anforderungen von Konservatoren gerecht zu werden, und mit den Erkenntnissen zur Struktur und Dynamik von Kolloiden können zufällige Ansätze der herkömmlichen Konservierungspraxis überwunden werden. Außerdem werden die Perspektiven der Anwendung von Kolloiden und weicher Materie für die Erhaltung von Kulturerbe zusammengefasst.

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Section: Accepted Manuscript Angewandte Chemie International Editionmentioning

confidence: 99%

Mikroemulsionen, Micellen und funktionelle Gele: Erhaltung von Kunstwerken mit Kolloiden und weicher Materie

Chelazzi¹,

Giorgi²,

Baglioni³

2018

Angewandte Chemie

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“…In EAPC, both ethyl acetate and propylene carbonate are partitioned between the continuous phase (water) and the dispersed droplets, which also accounts for the versatility and the effectiveness of this fluid in removing different types of coatings from the surface of works of art [22]. Three formulations of semi-IPN pHEMA/PVP chemical hydrogels have also been characterized in the literature [12,13]. The formulations differ in the monomer/crosslinker and pHEMA/PVP ratios, which result in different porosities (both macro-porosity and micro-porosity), equilibrium water content, and water release rate.…”

Section: Characterization Of the Nanomaterialsmentioning

confidence: 99%

“…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. For this purpose, o/w microemulsions have been recently used where they have been loaded in chemical hydrogels for the selective removal of adhesives from canvas paintings [12]. In particular, chemical gels formed by semi-interpenetrating (IPN) poly(2-hydroxyethyl methacrylate) (pHEMA) and polyvinylpyrrolidone (PVP) have emerged as advantageous systems for cleaning works of art, because they exhibit high retentiveness and optimal mechanical properties that allow their feasible application and their removal without leaving residues [12,13].…”

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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“…Surfactants, chelating agents and enzymes demonstrated a satisfactory cleaning action [7][8][9][10]. Unfortunately aqueous systems can not being used indiscriminately over all kind of surfaces [11].…”

Section: Introductionmentioning

confidence: 99%

Sustainability in art conservation: a novel bio-based organogel for the cleaning of water sensitive works of art

Prati

Volpi

Fontana

et al. 2017

Pure and Applied Chemistry

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Organo-and hydrogels have been proposed in the restoration field to treat different types of surfaces. The possibility to retain solvents and to have a controlled and superficial action allowed to use these materials for the removal of very thin layers applied on ancient historical objects, when the under paint layers are particularly delicate and water sensitive. In the last years, an increased attention has been devoted to the proposal of more healthy products to guarantee the safeguard of the operators. Few attention has been devoted to the development of green methods which foresee the use of renewable and biodegradable materials. The aim of this paper is to test a green organo-gel for the cleaning of water sensitive surfaces like varnished egg tempera paintings. The gel has been tested experimented on mock ups varnished with natural and synthetic materials and has been validated on a small portion of a Cimabue painting for the removal of two varnishes applied on two different test areas of the painting.

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Chemical semi-IPN hydrogels for the removal of adhesives from canvas paintings

Cited by 45 publications

References 6 publications

Mikroemulsionen, Micellen und funktionelle Gele: Erhaltung von Kunstwerken mit Kolloiden und weicher Materie

Mikroemulsionen, Micellen und funktionelle Gele: Erhaltung von Kunstwerken mit Kolloiden und weicher Materie

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

Sustainability in art conservation: a novel bio-based organogel for the cleaning of water sensitive works of art

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