NDLI: TEOS Nanocomposites for the Consolidation of Carbonate Stone: The Effect of Nano-HAp and $Nano-SiO_{2}$ Modifiers

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TEOS Nanocomposites for the Consolidation of Carbonate Stone: The Effect of Nano-HAp and $Nano-SiO_{2}$ Modifiers

Content Provider	MDPI
Author	Susana, Piçarra Rodrigues, Alexandra Fonseca, Bruno Sena da Pinto, Ana Paula Ferreira Montemor, Maria De Fátima
Copyright Year	2022
Description	This study aimed at evaluating the effect of hydroxyapatite (HAp) nanosized structures and nanoparticles of hydrophilic silica as modifiers of both acid- and alkaline-catalysed tetraethoxysilane (TEOS)-based products for the consolidation of carbonate stones. Their initial effectiveness and some compatibility aspects were assessed in a porous limestone (sound and artificially aged Ançã stone samples) and two types of treatment (capillary absorption and brushing). The studied products were examined by scanning electron microscopy (SEM) and micro-Raman spectroscopy. Their depth of penetration and strengthening effect were evaluated through drilling resistance. Their action on the substrate was also further assessed by non-destructive methods based on colour variation and Shore-D hardness. Treated stone samples were dissimilarly affected by the tested treatments and exhibited a significant increase in strength with a low risk of over-strengthening. Adequate in-depth penetration patterns, as well as colour compatibility with the substrate were obtained with some of the prepared formulations through two types of treatment, both in sound and aged stone samples. The potential most effective treatments with the lowest colour change were obtained with the acid-catalysed TEOS-based products modified with HAp nanosized structures.
Starting Page	981
e-ISSN	19961944
DOI	10.3390/ma15030981
Journal	Materials
Issue Number	3
Volume Number	15
Language	English
Publisher	MDPI
Publisher Date	2022-01-27
Access Restriction	Open
Subject Keyword	Materials Consolidation Carbonate Stone Teos Nanocomposites Hydroxyapatite Nano-rods Silica Nanoparticles
Content Type	Text
Resource Type	Article

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