Data di Pubblicazione:
2012
Citazione:
A comparative study of organic nanoparticles coatings for enhanced stone protection / P. Fermo, G. Cappelletti, M. Tambato, M. Merlini. ((Intervento presentato al 23. convegno Congresso Nazionale della Divisione di Chimica Analitica tenutosi a Isola d'Elba nel 2012.
Abstract:
Conservation of historical buildings is an important issue; the environmental
conditions seriously affect the monumental stones. The protection of
cultural heritage buildings and monuments by surface treatment with
polymers is a common practice due to their ability to form a protective layer
on the monumental surface as well as to control the transport of different
fluids from the surface to the inner part [1–3].
Moreover, in the last few years, nanomaterials have been frequently applied
for restoration and conservation of artworks. It is worth noting that
inorganic nano-oxides, such as silica and titania, improve the performances
of materials used in conservation field [4]. In particular, the application of
photocatalytic coatings on stone has been investigated for providing surface
protection and self-cleaning properties [5].
In this work three different substrates were used: Carrara/Botticino marbles,
and Angera stone. Commercially available siloxanes and acrylic polymers
were used as protective agents to improve the hydrophobicity features of the
different tested materials. Then the conservation effectiveness of inorganic
nanoparticles dispersions was evaluated when applied on the porous stone
substrates. The strengthening effect of the nanoparticles-based treatments is
compared to that exhibited by the well-known consolidant polymers.
Morphological (SEM-EDS), structural (XRD), thermal (TGA) and
spectroscopic (FTIR and DRS) analyses were carried out on coated and
uncoated stones to establish the changes of appearance, color, and water
absorption. Static/dynamic contact angle measurements and surface free
energy determinations were adopted to evaluate the final wettability and
self-cleaning properties before and after UV-light exposure and artificial
ageing.
Tipologia IRIS:
14 - Intervento a convegno non pubblicato
Elenco autori:
P. Fermo, G. Cappelletti, M. Tambato, M. Merlini
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