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New nanomaterials for consolidating stone
Synthesis of calcium alkoxides, involving ammonia gas-assisted reactions with the corresponding alcohol, have been carried out in nitrogen-filled gloves-boxes with the exclusion of moisture and oxygen according to procedures already described in the literature .
The corresponding coatings have been analysed by different techniques (FT-IR, XRD; FEG ESEM) and details can be found in papers by Favaro et al.
(2013) [The effects of solvents and different relative humidity conditions (50 and 90%) on carbonation rate and phase formation as well as the effects of outdoor environment and liquid water have been investigated.
Furthermore, the study here presented is part of the experimental work carried out within the project to achieve an exhaustive performance evaluation of the developed material by investigating its efficacy, compatibility and durability.
As the latter aspect is intimately linked to climate impact, environmental parameters having a crucial role in damage processes have been prioritized for a correct evaluation of the durability of the NANOMATCH product during the test in field.
The EC NANOMATCH Project aims at the development of innovative consolidating agents for carbonate matrices, wood and glass whose features should result in high compatibility, efficiency and long-lasting effect.
In this project, metal alkoxides, molecular precursors for the deposition of metal carbonate are synthesized, characterized, tested and proposed as an alternative to traditional consolidating agents as well as to calcium hydroxide nanoparticles.
This paper gives an overall description of the methodological approach adopted for the in field evaluation of durability taking into account the environmental impact.
Preliminary results of the analyses carried out on carbonate stones aimed at investigating the features of the consolidating treatment are here presented and discussed.] has contributed to the production of scenarios and maps representing the European situation concerning climatic events and related damage processes affecting outdoor built cultural heritage.
The results evidenced the complexity of carbonation process, where the most kinetically favoured vaterite is always formed but it can evolve to the thermodynamically stable calcite by addition of water and with high relative humidity.
The choice of the solvent is extremely important to control carbonation rate: higher vapour pressure (fast evaporation rate) leads to faster carbonation.