Synthesis and application of hydroxyapatite nanorods for improving properties of stone consolidants. Issue 10 (15th May 2022)

• Record Type: Journal Article
• Authors: Rodrigues, A.; Sena da Fonseca, B.; Ferreira Pinto, A.P.; Piçarra, S.; Montemor, M.F.
• Is Part Of: Ceramics international. Volume 48:Issue 10(2022)
• Page Start: 14606
• Page End: 14617
• Publication Date: 2022-05-15
• Subjects: Hydroxyapatite -- Nanorods -- TEOS -- Sol-gel -- Consolidation -- Carbonate stone; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.02.004
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: This study aims at preparing novel composite materials for the consolidation of damaged stone in built heritage from tetraethoxysilane(TEOS)based sols with nano-sized hydroxyapatite (HAp) with high crystallinity and high aspect ratio. Synthesis of nanostructures of hydroxyapatite (HAp) was carried out using hydrothermal precipitation methods at different reaction temperatures and periods. Rod-like HAp nanostructures with a diameter around 5–20 nm and length up to 125 nm were obtained. The samples of nano-HAp were characterised using powder X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and μ-Raman spectroscopy. The derived nanostructures were used to modify TEOS-based formulations after tuning their colloidal stability period to the needs of their application as stone consolidants. The chemical structure ( μ -Raman), viscosity, macroscopic and microscopic morphologies – Scanning Electron Microscopy (SEM) and EDS – and Shore Hardness of the composite materials were studied. The potential of the composite materials containing nano-HAp-rods as stone consolidants revealed to be superior to the potential of reference materials.