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Sunday, 22 September 2019
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Raw materials & technologies, Science today - coatings tomorrow

Designing self-cleaning coating for monument conservation

Tuesday, 15 January 2013

Greek researches developed a hydrophobic hybrid semi-crystalline SiO2-TiO2 coating and investigated its application in the field of monument conservation. This transparent coating showed self-cleaning properties, without modifying the colour of the marble surface and the water vapour permeability.

Self-cleaning coating doesn't affect the colour of the marble surface / Source: Maren Beßler, Pixelio

Self-cleaning coating doesn't affect the colour of the marble surface / Source: Maren Beßler, Pixelio

The coating was derived from a mixture of tetraethoxysilane (TEOS) and titanium-tetra-isopropoxide (TTIP) incorporating an organosilane, the hydroxyl-terminated polydimethylsiloxane (PDMS).

The SEM analysis of the treated sample revealed a homogeneous crack-free coating on marble, while FTIR proved that condensation and copolymerisation reactions took place on the marble surface. The removal of both methylene blue stains and biofilm on treated samples supported the self-cleaning properties of the designed coating.

The total colour differences and the decrease of the water vapour permeability ranged within acceptable limits. After treatment, a decrease in the water capillary coefficient and an increase in the contact angle were observed.

Read the complete article "TiO2–SiO2–PDMS nano-composite hydrophobic coating with self-cleaning properties for marble protection” in the "Progress in Organic Coatings”, Vol. 76, Issue 2-3, 2013, pp. 400-410.

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