New nanomaterials for protecting and consolidating stone
Surfactant-Synthesized PDMS/Silica Nanomaterials Improve Robustness and Stain Resistance of Carbonate Stone Juan F. C, 2011, 115 (30), pp 14624–14634 DOI: 10.1021/jp203524p Publication Date (Web): June 27, 2011 Copyright © 2011 American Chemical Society New, Fast and Green Procedure for the Synthesis of Gold Nanoparticles L.
The properties of the treated stone were affected by the presence of cracks in the coating.In this article, we present an overview of our current research centred on producing crack-free sol-gel materials for consolidating and protecting building stone.A novel synthesis, in which a surfactant acts as a template to make the pore size of the gel network coarser and more uniform, is shown to provide an effective alternative for preventing the cracking of consolidants.Biodeterioration represents one of the major degradation processes of outdoor stone monuments.In a first step the nanomaterials were applied on stone samples and studied with scanning electron microscopy and spectrophotocolorimetry.Morphological observations of the stone surface, static contact angle and colour measurements, water vapour transmission test, and tests of water absorption were carried out to characterize the untreated and treated stones.
A concentration below the minimum level suggested by the manufacturer was still able to act as a good barrier against water.
In fact, it has been demonstrated that inorganic oxide nanoparticles, such as silica and titania, may improve the performance of materials used in the conservation field.
The experience in the synthesis and characterization of nanoparticles within UTTMAT at ENEA, combined with the experience in conservation materials in terms of durability of the conservative products, fostered a research investigation on nanocomposites applied to cultural heritage.
Finally, preliminary tests on the inhibitory effect on the growth of the fungus were also carried out.
Chemical-physical and aesthetic alteration is caused which requires periodical intervention mainly consisting in cleaning, frequently accompanied by other treatments such as consolidation and repair.
The results showed that in case of zinc oxide a tenfold higher concentration of nanoparticles as compared with Cu-NPs can be utilized in the matrices without affecting the colour of the stone substrate, which means that the new material should be able to exert a long-lasting biocide activity.