Interactions between Nanostructured Calcium Hydroxide and Acrylate Copolymers: Implications in Cultural Heritage Conservation

Carretti, Emiliano; Chelazzi, David; Rocchigiani, Giulia; Baglioni, Piero; Poggi, Giovanna; Dei, Luigi

doi:10.1021/la401883g

Cited by 50 publications

(46 citation statements)

References 26 publications

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“…A survey of pertinent literature on synthesis of CHNPs is summarized in Table . The results presented in Table point to a few generic features.…”

Section: Introductionmentioning

confidence: 99%

“…The first generic feature is the inevitable presence of the carbonation process irrespective of whether a surfactant and/or an airtight container are used . The carbonation process almost invariably happens independent of whether nonaqueous or nonaqueous along with aqueous or an aqueous medium is utilized. The almost generic presence of calcium hydroxide and calcium carbonate phases is a consequence of the carbonation process and definitely does not happen as events independent of the carbonation process .…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Nano Calcium Hydroxide in Aqueous Medium

et al. 2015

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The present work reports a simple, inexpensive method for synthesis of calcium hydroxide [Ca(OH) 2 ] nanoparticles (CHNPs). The method involves chemical precipitation (CP) in aqueous medium at room temperature. Calcium nitrate dihydrate [Ca (NO 3 ) 2 .2H 2 O] and sodium hydroxide were used as precursors. The CHNPs were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Rietveld analysis, field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM), BET surface area evaluation as well as particle size distribution analysis techniques. The results confirmed the synthesis of CHNPs as the major phase. The CHNPs exhibited an average size of about 350 nm. In addition, some calcite phase formed due to the inevitable carbonation process. A very minor amount of aragonite phase was also present. A schematically developed new qualitative model is proposed to explain the genesis and subsequent evolution of the various phases at the nanoscale. The model helps to identify the rate-controlling step. It also highlights the implication of reaction kinetics control in synthesis of predesigned nanophase assembly.

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“…A survey of pertinent literature on synthesis of CHNPs is summarized in Table . The results presented in Table point to a few generic features.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Nano Calcium Hydroxide in Aqueous Medium

et al. 2015

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“…In the presence of acrylic copolymers, nanolime showed an increase in mechanical strength; however water vapor permeability was reduced due to the hydrophobicity of the copolymers (Carretti, 2013).…”

Section: Other Findingsmentioning

confidence: 99%

Performance evaluation of commercial nanolime as a consolidant for friable lime-based plaster

Jang

Matero

2018

Journal of the American Institute for Conservation

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This thesis focuses on the performance evaluation of commercial nanolime as a consolidant for friable historic lime based plaster such as found at Mission San Jose de Tumacácori, a Spanish Colonial mission site near Tucson, Arizona. The church's façade was originally finished with a polychromatic painted on fired brick and adobe. Though generally stable over time, the exterior plaster at Tumacácori became friable and detached after repeated weathering cycles of high diurnal temperature swings and precipitation concentration during monsoon season in the summer. As friable stucco is vulnerable to loss, consolidation should be considered a first priority in the conservation plan for the Tumacácori's façade.Derived from an older limewater method, nanolime is a relatively recent material created by synthesizing nanoscale calcium hydroxide particles and obtaining stability through using alcohol solvents. CaLoSiL®, produced by IBZ-Salzchemie GmbH&Co. KG, was selected for performance testing as a consolidant for friable plaster studying its effect on enhancing grain cohesion, durability to weathering, and impact on aesthetic character. ASTM and RILEM testing methods were employed including splitting tensile strength, porosity by liquid nitrogen immersion, water vapor permeability, color change, frost resistance, and optical and scanning electron microscopy. Ultimately, the analytical findings of this thesis will be used as a recommendation for future conservation of the Tumacácori façade.

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“…For instance, acrylate resins on the surface of murals modify the substrate's porosity and hinder permeability to water vapour, favouring the growth at the resin-mural interface of salts crystals, eventually resulting in strong mechanic stress in the pores and the disruption of the painting surface. [5] In the traditional conservation practice, the removal of unwanted layers is based on their solubilization either in pure solvents or solvent blends. Solubility is commonly predicted using parameters calculated according to different models.…”

Section: The Limits Of Classical Approaches To Cleaning Artefactsmentioning

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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Interactions between Nanostructured Calcium Hydroxide and Acrylate Copolymers: Implications in Cultural Heritage Conservation

Cited by 50 publications

References 26 publications

Synthesis of Nano Calcium Hydroxide in Aqueous Medium

Synthesis of Nano Calcium Hydroxide in Aqueous Medium

Performance evaluation of commercial nanolime as a consolidant for friable lime-based plaster

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

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