Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 30, Pages 14624-14634Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp203524p
Keywords
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Funding
- Spanish Government
- European Regional Development Fund (ERDF) [MAT2007-60681, MAT2010-16206, TRACE PET2008-0134]
- Regional Government of Andalusia [TEP2092]
- Tino Stone S.A.
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We have developed a simple sol gel treatment procedure that enhances the properties of pure limestones to make them more suitable for commercial use; in particular, we have improved the mechanical robustness of the stone. When treated, the stone also has enhanced hydrophobic, water-repellent, and stain-resistant properties, which have been evaluated. We have demonstrated that the addition of poly(dimethylsiloxane) (PDMS) to a silica oligomer associated with a neutral catalyst, in the presence of a surfactant, accelerates the gelling process; this reduction of the time needed for the product to gel in carbonate stones helps to achieve effective stone consolidation. The addition of PDMS to the starting sol has been shown to produce a combined effect: it reduces surface energy and creates a dual scale of roughness that is responsible for the improvement of its water-repellent properties. Increasing the PDMS content thus improves the mechanical properties, hydrophobic behavior, and stain-repellent quality of the limestone.
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