Umberto I Tunnel in Rome. Photo: Andrés Nieto Porras from Palma de Mallorca, España, CC BY-SA 2.0 <https://creativecommons.org/licenses/by-sa/2.0>, via Wikimedia Commons
Smart buildings are more and more on the agenda. For their elaboration, some materials have been developed to meet specific objectives during their use without the need to be operated by any person or equipment. Self-maintenance, cleaning the air, working with the comfort of space, energy efficiency, are just some of the benefits that can be achieved by adopting them.