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Tuesday, 21 May 2019
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Raw materials & technologies, Science today - coatings tomorrow

Smart hybrid coatings for natural stones conservation

Monday, 8 December 2014

The protection of stone monuments against deterioration has recently attracted much attention from scientists.

Superhydrophobic coatings were obtained by mixing nano-TiO<custom name='sub'>2</custom> and a silane resin. Source: www.sciencedirect.com

Superhydrophobic coatings were obtained by mixing nano-TiO2 and a silane resin. Source: www.sciencedirect.com

An accurate analysis of the degradation mechanisms of stones has led to the conclusion about the necessity of protection especially against the condensed water and the salts formation.

Comparing the strengthening effect of nanoparticles-based treatments

In a study, Italian researchers compared the strengthening effect of nanoparticles-based treatments to that exhibited by a silane commercial polymer. The surface properties of these types of smart coatings were investigated by different analytical techniques such as contact angle measurements and scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS). Aimed at evaluating the coating performance, exposure tests both to UV ageing and to environmental atmospheric pollution were carried out. Diffuse reflectance spectroscopy (DRS) was employed for the CIELab colorimetric coordinates assessment; while ion chromatography (IC) was adopted to evaluate the coating capacity to avoid salts (Cl, NO3 and SO42−) formation.

The study is published in: Progress in Organic Coatings, Volume 78, January 2015, Pages 511-516.

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