Nanolimes doped with quantum dots for stone consolidation assessment

Becerra, Javier; Ortiz, Pilar; Martín, J.M.; Zaderenko, Ana Paula

doi:10.1016/j.conbuildmat.2018.12.077

Cited by 17 publications

(7 citation statements)

References 49 publications

(70 reference statements)

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“…The samples were dried during 20 days after application, specifically to favor the end of the carbonatation process on the samples treated with Ca(OH) 2 NPs. This time follows the criteria of previous studies about the end of the carbonatation process using Raman spectroscopy [38].…”

Section: Discussionmentioning

confidence: 98%

“…The ZnO QDs are tiny spherical particles of 8 nm that are posed heterogeneously over the hexagonal portlandite nanoplates. The synthesis was made according to Becerra et al [44], and the solvent for the application was acetone, due to the good result achieved in previous studies [38] and its low toxicity [45]. In addition, the higher evaporation rate of the acetone (6.6; unit: butyl acetate = 1 [45]), in comparison with alcohols commonly used in these kinds of dispersions (ethanol: 2.0; isopropanol: 2.9 [45]), avoids possible inconveniences due to photochemical reactions caused by a prolonged presence of the solvents into stone.…”

Section: Treatmentsmentioning

confidence: 99%

“…This was made according to Drdácký et al [47], using Scotch Cristal tape (3M) with 10 repetitions over the same location. The percentage of consolidation (%C) was calculated according to the equation [38]:…”

Section: Assessment Of the Treatmentsmentioning

confidence: 99%

“…This treatment has improved the effectiveness of calcium hydroxide with respect to the use of limewater [26], but only as pre-consolidant [35] due to its low penetration [24,36]. Recent studies try to improve these treatments by studying their application in different solvents and their colloidal stabilities [37,38]. In this research, a new nanocomposite based on Ca(OH) 2 NPs doped with zinc oxide quantum dots (ZnO QDs) has been used.…”

Section: Introductionmentioning

confidence: 99%

“…In this research, a new nanocomposite based on Ca(OH) 2 NPs doped with zinc oxide quantum dots (ZnO QDs) has been used. This product has been designed and synthesized by our research group and allows us to measure easily its penetration depth under ultraviolet lights thanks to the fluorescent property of the ZnO QDs [38].…”

Section: Introductionmentioning

confidence: 99%

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Basic Protocol for On-Site Testing Consolidant Nanoparticles on Stone Cultural Heritage

2019

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Currently the application of consolidants based on nanoparticles is common practice among restorers. Consolidants should not modify the properties of original materials according to international recommendation, which requires previous studies to decide the optimal option. The selection must be based on empirical results, and not only in the expertise of the restorer, because the consolidant’s effectiveness is influenced by its own properties and other factors such as the characteristics of the artwork (elemental composition, porosity, texture, etc.) and its context (temperature, relative humidity, etc.). Moreover, new protocols must be sustainable and compatible with on-site restoration. A new protocol to test consolidant nanoparticles has been designed and assessed. This is based on easy trials and low-cost techniques—digital microscope, colorimeter, peeling test and ultrasound—that could be employed by restorers in situ. In this paper, different consolidant nanoparticles were tested on stones from two historical quarries. The first treatment was SiO2 nanoparticles, and the second, a new nanocomposite of Ca(OH)2 and ZnO quantum dots that allows us to measure penetration depth easily and discern the treated areas under UV lights. This second treatment was the best option for the studied stones, validating the protocol designed for the choice of consolidants.

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Section: Discussionmentioning

confidence: 98%

Section: Treatmentsmentioning

confidence: 99%