New nanomaterials for protecting and consolidating stone

Carlos III University of Madrid - Instituto Tecnológico de Química y Materiales Alvaro Alonso Barba (IAAB-UC3M), Spain In recent times, nanomaterials have been applied in the construction and maintenance of the worldÅLs cultural heritage with the aim of improving the consolidation and protection treatments of damaged stone. Manoudis, P.; Papadopoulou, S.; Karapanagiotis, I.; Tsakalof, A.; Zuburtikudis, I.; Panayiotou, C. Linsebigler, A.; LLu, G.; Yates, J. (1995) Photocatalysis on Ti O2 surfaces: principles, mechanisms, and selected results. (2015) Ti O2-based nanocoatings for preserving architectural Stone surfaces: An overview. These nanomaterials include important advantages that could solve many problems found in the traditional interventions. (2007) Polymer-Silica nanoparticles composite films as protective coatings for stone-based monuments.

We tried different things: we tried freeze storage, we tried salts and acids, and we decided to go for thermal ageing, explains Matea Ban, material scientist at the University of Technology in Vienna.It is important that these particles have the same chemical nature as the stones that are being treated, so that the physical and mechanical processes that occur over time dont lead to the break-up of the stones, says Dario Paolucci, chemist at the University of Pisa.The first challenge for researchers is to determine the mechanical characteristics of the cathedrals la cristalización de la sal presente en la roca en la velocidad de propagación de ultrasonidos. We determined the permeability to water vapour of three granites from the region of Galicia in northwest Spain, before and after treatment with water repellents, with the aim of evaluating the usefulness of this property as a standard descriptive parameter for granites used in construction, and as an indicator of the deleterious effects of water-repellent treatments.Our results indicate that pre-treatment permeability to water vapour varies markedly not only among test slabs cut in different orientations, but also among test slabs cut consecutively from the same sample in the same orientation; in other words, the material is anisotropic as regards permeability, and permeability is strongly dependent on small-scale textural and structural heterogeneity.

Leave a Reply