Article

Synthesis and analytical characterisation of copper-based nanocoatings for bioactive stone artworks treatment. Anal Bioanal Chem

Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, via Orabona 4, 70125 Bari, Italy.
Analytical and Bioanalytical Chemistry (Impact Factor: 3.44). 10/2010; 399(1):473-81. DOI: 10.1007/s00216-010-4301-8
Source: PubMed

ABSTRACT

Biological agents play an important role in the deterioration of cultural heritage causing aesthetic, biogeophysical and biogeochemical damages. Conservation is based on the use of preventive and remedial methods. The former aims at inhibiting biological attack, and the latter aims at eradicating the biological agents responsible for biodeterioration. Here, we propose the preparation and the analytical characterisation of copper-based nanocoating, capable of acting both as a remedy and to prevent microbial proliferation. Core–shell CuNPs are mixed with a silicon-based product, commonly used as a water-repellent/consolidant, to obtain a combined bioactive system to be applied on stone substrates. The resulting coatings exert a marked biological activity over a long period of time due to the continuous and controlled release of copper ions acting as biocides. To the best of our knowledge, this is the first time that a multifunctional material is proposed, combining the antimicrobial properties of nanostructured coatings with those of the formulations applied to the restoration of stone artworks. A complete characterisation based on a multi-technique analytical approach is presented.

Online abstract figure
Release properties and morphological features of copper-based nanocoatings.

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Available from: Inez D van der Werf, Jun 03, 2014
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    • "Despite copper ions are acting as biocides [36], the copper-based artefacts surface is dramatically affected by different insoluble corrosion products like AgCl, Ag 2 S, CuS, AgCuS, Cu 2 O or copper carbonates [37]. However, the sol-gel technique is not used widely for the preservation of copper artefacts so far. "
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    ABSTRACT: A simple sol-gel technique for the preparation of methyl–modified silica coatings for the protection of the external surface of copper has been used in this study. Tetraethylorthosilicate (TEOS) has been used as a precursor to prepare nanosilica coatings on the surface of copper. The methyl–modified silica sols were obtained by mixing of 3% SiO2 sol solution with trimethylchlorosilane (TMCS) or hexamethyldisilozane (HMDS) as basic materials. For comparison, the copper substrates were also coated with commercial polymers (Paraloid B 72, Plexisol P 550-40 and polyvinyl butyral (PVB)). The surface morphology changes of uncoated and coated specimens were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The hydrophobicity of surfaces and photochemical ageing effects were evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.
    Full-text · Article · May 2014 · Journal of Cultural Heritage
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    • "Nanoparticles are much more active than larger size particles because of their much higher surface area and ability to display unique physical and chemical properties. The use of nanoparticles as antimicrobial agents for archeological objects has been already proposed and tested, but mainly on stone substrates [7] [8]. "
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    ABSTRACT: Zinc oxide nanoparticles were prepared and used for surface treatment of oil paintings painted on paper supports. The prepared coating mixture containing 2% of ZnO nanoparticles showed excellent transparency. The effect of coating on protecting the paper support and paintings against microbial attack by Trichoderma reesei and Aspergillus niger, dirt accumulation, and UV aging was studied. Coatings containing ZnO nanoparticles enhanced the durability of linseed oil-based paintings toward UV aging regarding the change in color. Coatings containing ZnO nanoparticles improved resistance to microbial attack when subjected to inoculums containing T. reesei or A. niger fungi. In addition, coatings containing ZnO nanoparticles reduced accumulation of dirt on oil paintings when left in open air for 6 months; cleaning of paintings was quite easy compared to the non-coated paintings or those coated with the varnish without ZnO nanoparticles.
    Full-text · Article · Mar 2014 · Journal of Cultural Heritage
    • "Several methods to prevent stone biodegradation were proposed including biocide treatment (Cámara et al., 2011), copper-based nanocoating (Ditaranto et al., 2011). Another approach was proposed to eliminate gram-negative bacteria in the treatment of monument stone by their membrane permeabilization. "
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    ABSTRACT: Biodegradation is a long process and microorganism communities responsible for this process are complex, mostly composed mainly of fungi and bacteria. Some of these communities, depending on the substrate and micro climatic conditions, may be associated with cyanobacteria, algae and Archaea . Determination of the diversity of microorganisms that inhabit different art works is of major importance for restoration and conservation. The methods used in studying these communities in recent decades can be summarized to a few techniques (DGGE, cultured and uncultured methods, 16S rDNA clone library analysis etc), but these may underestimate the diversity of communities compared to new techniques available (next generation sequencings methods) that provide more close to reality results. In this paper we tried to show the research findings in last few decades that point microorganism communities that populate the world heritage objects and we support the need to investigate these communities using new next generation sequencing methods. Even if conservation can be extended at millennia, preserving for centuries the works of art is a win for world culture.
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