Unravelling the role of TiO2 nanoparticles on the optical performance of dark colourants for coatings

• DOI: 10.1016/j.matchemphys.2024.129014
• Publication Date: 2024-02-20T12:40:11Z
• Authors: Rita Carvalho Veloso; Catarina Dias; Andrea Souza; Nuno M.M. Ramos; João Ventura

The growing concern on energy savings in buildings, particularly related with cooling needs, has led to the search of new constructive solutions. Frequently, darker colour coatings are used buildings for aesthetics purposes. However, such have low reflectance, absorbing a large portion solar radiation. associated heat gains enhance building demand and may reduce service life renderings owing increased thermal stresses comparison light coatings. aim this study was assess influence size (30–5000 nm), optical band gap concentration (0–20%) TiO2 nanoparticles conventional black colourant applications. We confirm that use increases reflectance demonstrate 50 nm is most adequate nanoparticle enhancement. Furthermore, colourimetric parameters also affected by incorporation, difference becoming increasingly noticeable human eye increasing concentration. Such results can lead formulations reflective able overall load, warm climates high demands.