Calcium hydroxide nanoparticles coatings applied on cultural heritage materials: Their influence on physical characteristics of earthen plasters

García-Vera, Victoria Eugenia; Tenza-Abril, Antonio José; Solak, Afonso Miguel; Lanzón, Marcos

doi:10.1016/j.apsusc.2019.144195

Cited by 24 publications

(9 citation statements)

References 25 publications

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“…Environmental factors affect not only the human health, being able to damage important cultural heritage objects which are kept in outdoor conditions. The use of protective coatings gained importance in heritage conservation, and coatings based on natural products replace successfully chemical hazardous substances [164]. From the category of inorganic compounds, calcium hydroxide can be used as a coating material, due to its property to be transformed under natural atmospheric conditions into a hard coating of insoluble CaCO 3 .…”

Section: Coatings For Miscellaneous Applicationsmentioning

confidence: 99%

Natural Ingredients in Functional Coatings—Recent Advances and Future Challenges

Fierăscu

Chican

2021

Coatings

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In recent decades, coating materials have gained researchers’ interest, finding applications in different areas such as antimicrobial coatings for biomedical applications, coatings for increasing the shelf-life of commercial products, or coatings for the conservation of cultural heritage artifacts. The use of new types of coating materials based on natural ingredients can lead to the removal of harmful chemicals and contribute to the development of materials having different and promising properties. New challenges can appear both in the production process, as well as in the case of final application, when coating materials must be applied on various supports. The present review paper aims to be a critical discussion regarding the possibility of using natural ingredients as functional coatings, and to prove that the same material can be used in different fields, from the biomedical to environmental, or from cultural heritage protection to the food and cosmetic industries. The paper is based on the newest published studies, and its main goal is to be an inspiration source for researchers, in order to create more functional and applicable composite coatings in specific fields.

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Section: Coatings For Miscellaneous Applicationsmentioning

confidence: 99%

Natural Ingredients in Functional Coatings—Recent Advances and Future Challenges

Fierăscu

Chican

2021

Coatings

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“…Likewise, there is greater effectiveness in samples with low crystallinity, that is, being the amorphous variety of SiO 2 achieves a faster growth of the C–S–H 35 . Besides, the incorporation of nano‐Ca(OH) 2 has proven to be highly effective in lime mortars, 24,36–38 being very useful in restoring historical mortars of great values within the cultural heritage 39–42 …”

Section: Introductionmentioning

confidence: 99%

“…29 Previous studies report the effectiveness of nano-SiO 2 in the formation of C-S-H. [30][31][32][33][34] Likewise, there is greater effectiveness in samples with low crystallinity, that is, being the amorphous variety of SiO 2 achieves a faster growth of the C-S-H. 35 Besides, the incorporation of nano-Ca(OH) 2 has proven to be highly effective in lime mortars, 24,[36][37][38] being very useful in restoring historical mortars of great values within the cultural heritage. [39][40][41][42] Afwillite (Ca 3 Si 2 O 7 ⋅3H 2 O), amongst the C-S-Hs, plays a significant role in the hydration process of cement pastes and concrete, 43,44 prompting microstructure modifications. 6,21,22,45 For this reason, there is an interest in synthesizing afwillite to accelerate the hydration process.…”

Section: Introductionmentioning

confidence: 99%

Evolution of C–S–H in lime mortars with nanoparticles: Nanostructural analysis of afwillite growth mechanisms by HRTEM

et al. 2022

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This work studies the formation of calcium–silicate–hydrates (C–S–H) in lime mortars prepared with additions of nano‐Ca(OH)2 and nano‐SiO2 at 23.3°C. Mineral identification was carried out by X‐ray diffraction after 10, 30, 90, and 120 days of curing. The nanoscale study starts from the generation of amorphous phases until the development of crystalline phases. Observations of binder mortar made by transmission electron microscopy (low magnification and high resolution TEM) after 30 and 110 days of curing showed the formation of two types of C–S–H with different degrees of crystallinity depending on the curing time. The development of short‐range order C–S–H globular phases was visible after 30 days. C–S–H evolved into lamellar crystalline phases visible after 110 days of curing. The crystalline phase corresponds to the C–S–H known as afwillite (Ca3(SiO3OH)2·2H2O), first reported to affect cement and concrete's mechanical and hydration properties. It appears as isolated fibers, growing epitaxially along the edges of the calcite (product of the carbonation of Ca(OH)2), and advancing inward aided by atomic defects (grain boundaries, stacking faults). In addition, high‐resolution transmission electron microscopy tools and electron diffraction simulation confirmed a monoclinic symmetry for afwillite crystals. These results contribute to analyzing the presence of crystalline/amorphous C–S–H in lime mortars, providing information on the structure of afwillite and its possible effects on the binder materials.

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“…Extensive dew and water evaporation are especially serious problems for earthen heritage sites. Various kinds of materials have been developed to consolidate soil surface, such as potassium-silica solution, iron-based bioproducts, calcium hydroxide nanoparticles and organosilicones [8][9][10][11][12]. However, there is no successful case reported in humid regions after long-term preservation.…”

Section: Introductionmentioning

confidence: 99%

A Semi-Theoretical Model for Water Condensation: Dew Used in Conservation of Earthen Heritage Sites

Xiang

Wang

Zhang

2020

Water

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Dew is a common but important phenomenon. Though water is previously considered to be a threat to earthen heritage sites, artificial dew is showing potential in relic preservation. A model of dew prediction on earthen sites will be essential for developing preventive protection methods, but studies of dew formation processes on relics are limited. In this study, a two parameter model is proposed. It makes approximations according to the features of earthen heritage sites, assuming that a thin and steady air layer exists close to the air–solid interface. This semi-theoretical model was based on calculations of the mass transfer process in the air layer, and was validated by simulations of laboratory experiments (R > 0.9) as well as field experiments. Additionally, a numerical simulation, performed by the commercial software COMSOL, confirmed that the difference between fitting parameter δ and the thickness of assumed mass transfer field was not significant. This model will be helpful in developing automatic environmental control systems for stabilizing water and soluble salts, thus enhancing preventive protection of earthen heritage sites.

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Calcium hydroxide nanoparticles coatings applied on cultural heritage materials: Their influence on physical characteristics of earthen plasters

Cited by 24 publications

References 25 publications

Natural Ingredients in Functional Coatings—Recent Advances and Future Challenges

Natural Ingredients in Functional Coatings—Recent Advances and Future Challenges

Evolution of C–S–H in lime mortars with nanoparticles: Nanostructural analysis of afwillite growth mechanisms by HRTEM

A Semi-Theoretical Model for Water Condensation: Dew Used in Conservation of Earthen Heritage Sites

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