materials Article Stone/Coating Interaction and Durability of Si-Based Photocatalytic Nanocomposites Applied to Porous Lithotypes Marco Roveri 1,*, Francesca Gherardi 2 , Luigi Brambilla 1 , Chiara Castiglioni 1 and Lucia Toniolo 1 1 Politecnico di Milano, Dipartimento di Chimica, Materiali e ...