Nanoparticles for conservation of bio-calcarenite stone

Licchelli, Maurizio; Malagodi, Marco; Weththimuni, Maduka L.; Zanchi, Chiara

doi:10.1007/s00339-013-7973-z

Cited by 71 publications

(51 citation statements)

References 34 publications

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“…The relative kinetic stability (KS %) for H100 is less than 40 % at 4 h from the preparation of the dispersion, and around 25 % at 8 h, indicating that most of the nanoparticles have settled at this time. The aggregation phenomena observed for H100 are most probably caused by short-range (attractive) Van der Waals forces [32,33].…”

Section: Nanolimes Kinetic Stabilitymentioning

confidence: 98%

Optimization of nanolime solvent for the consolidation of coarse porous limestone

et al. 2016

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The potentialities of nanomaterials for application in the field of conservation have been widely investigated in the last two decades. Among nanomaterials, nanolimes, i.e., dispersions of lime nanoparticles in alcohols are promising consolidating products for calcareous materials. Nanolimes are effective in recovering the very superficial loss of cohesion of decayed materials, but they do not always provide sufficient mass consolidation. This limitation is mainly related to the deposition of the nanoparticles nearby the surface of the material. Experimental research has been set up with the aim of improving the in-depth deposition of lime nanoparticles. Previous research by the authors has shown that nanolime deposition within a substrate can be controlled by adapting the nanolimes properties (kinetic stability and evaporation rate) to the moisture transport behavior of the substrate. Nanolime properties can be modified by the use of different solvents. In this research, nanolime dispersions have been further optimized for application on Maastricht limestone, a coarse porous limestone. Firstly, nanolimes were synthesized and dispersed in ethanol and/or water, both pure and mixed in different percentages. Subsequently, based on the kinetic stability of the nanolime dispersions, the most promising solvent mixtures were selected and applied on the limestone. The deposition of lime nanoparticles within the limestone was studied by phenolphthalein test, optical microscopy and scanning electron microscopy. The results confirm that nanolime dispersed in a mixture of ethanol (95 %) and water (5 %) can guarantee a better nanoparticles in-depth deposition within coarse porous substrates, when compared to dispersions in pure ethanol.

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Section: Nanolimes Kinetic Stabilitymentioning

confidence: 98%

Optimization of nanolime solvent for the consolidation of coarse porous limestone

et al. 2016

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“…In addition, nanosized barium, strontium, and magnesium hydroxides have emerged as efficient consolidants for porous stone and frescoes . Depending on the characteristics of their colloids and the nature of the dispersion alcohol, similar to the Ca(OH) 2 dispersion, strontium hydroxide [Sr(OH) 2 ] and magnesium hydroxide [Mg(OH) 2 ] dispersions can produce the respective carbonates.…”

Section: Alkaline Earth Metal Hydroxide Np Dispersionsmentioning

confidence: 99%

Inorganic Nanomaterials for Restoration of Cultural Heritage: Synthesis Approaches towards Nanoconsolidants for Stone and Wall Paintings

et al. 2018

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The synthesis of inorganic nanostructured materials for the consolidation of stone and wall paintings is reviewed. To begin, a description of the methods most commonly used to prepare nanoconsolidants is provided, particularly in the frame of colloid chemistry. Some concepts of the carbonation mechanism as well as the transport properties of some of these materials are addressed. An overview of the synthesis methods together with some of the application particularities of the distinct consolidants are presented thereafter. Furthermore, the requisites for efficient consolidants and some drawbacks of the nanoconsolidants are discussed.

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“…Different application methods can be used including dipping, spraying, pouring, immersion, vacuum impregnation, injection, or brushing on Japanese paper (D'Armada and Hirst, 2012;Baglinoi et al, 2015). However, Licchelli's research group found brushing applications appear to perform better than immersion methods on bio-calcarenite stone (Licchelli et al, 2014).…”

Section: Characterization Of Nanolime Consolidantmentioning

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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Nanoparticles for conservation of bio-calcarenite stone

Cited by 71 publications

References 34 publications

Optimization of nanolime solvent for the consolidation of coarse porous limestone

Optimization of nanolime solvent for the consolidation of coarse porous limestone

Inorganic Nanomaterials for Restoration of Cultural Heritage: Synthesis Approaches towards Nanoconsolidants for Stone and Wall Paintings

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

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