A Note of Caution on the Use of Calcium Nanoparticle Dispersions as Deacidifying Agents in Studies in conservation, Vol.68 N°1-2(2023; January-February) (2023-01-01)

Public ISBD [article]  inStudies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 128-135 Titre : A Note of Caution on the Use of Calcium Nanoparticle Dispersions as Deacidifying Agents Type de document : texte imprimé Année de publication : 2023 Article en page(s) : P. 128-135 Langues : Anglais (eng) Catégories : Acidification -- Lutte contre Chaux Isopropanol Nanoparticules Papier -- Conservation et restauration pH -- Mesure Suspensions (chimie) Toile (Tissu) -- Conservation et restauration Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Calcium hydroxide nanoparticles dispersed in ethanol or 2-propanol have been proposed for deacidification treatments of cellulose-based supports and are currently adopted by many paper and paintings conservators. There is however a risk inherent in this treatment: the dispersion would acquire a highly alkaline pH in the presence of moisture, absorbed by the dispersing alcohol solvents or by the cellulose-based support. Consequently, conditions of potential risk would be created for the structural integrity of the cellulosic supports, for some organic film-forming materials and some colouring matter. The simple tests conducted in this study clearly demonstrate that this risk is real, and suggest a cautious attitude in evaluating the suitability of these nano-dispersions for the treatment of some works of art. [article] A Note of Caution on the Use of Calcium Nanoparticle Dispersions as Deacidifying Agents [texte imprimé] . - 2023 . - P. 128-135. Langues : Anglais (eng) in Studies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 128-135 Catégories : Acidification -- Lutte contre Chaux Isopropanol Nanoparticules Papier -- Conservation et restauration pH -- Mesure Suspensions (chimie) Toile (Tissu) -- Conservation et restauration Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Calcium hydroxide nanoparticles dispersed in ethanol or 2-propanol have been proposed for deacidification treatments of cellulose-based supports and are currently adopted by many paper and paintings conservators. There is however a risk inherent in this treatment: the dispersion would acquire a highly alkaline pH in the presence of moisture, absorbed by the dispersing alcohol solvents or by the cellulose-based support. Consequently, conditions of potential risk would be created for the structural integrity of the cellulosic supports, for some organic film-forming materials and some colouring matter. The simple tests conducted in this study clearly demonstrate that this risk is real, and suggest a cautious attitude in evaluating the suitability of these nano-dispersions for the treatment of some works of art.

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