Fernandez-Acevedo, C. (Claudio)

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    Development of multifunctional coatings for protecting stones and lime mortars of the Architectural Heritage
    (Taylor & Francis, 2020-03-04) Sanchez, L. (Luis); Alvarez-Galindo, J.I. (José Ignacio); Pastor, A. (Adrián); Salaza, C. (Cristina); Navarro-Blasco, I. (Iñigo); Oroz-Mateo, T. (Tania); Fernandez-Acevedo, C. (Claudio); Speziale, A. (Alessandro); Tasci, B. (Burcu); Gonzalez-Sanchez, J.F. (Jesús Fidel); Fernandez-Alvarez, J.M. (José María)
    Unique multifunctional coatings, comprising a 3D superhydrophobic agent and two nanostructured photocatalysts (solar-light sensitive 50/50 and 10/90 TiO2-ZnO nano-heterostructures), compatible with the inorganic substrates of the Built Heritage, have been designed. The synthesized nanoparticles showed an enhanced photocatalytic activity (tested by NO degradation) as compared with the raw TiO2 and ZnO materials. Dispersing agents were used to optimize the coatings, avoiding agglomeration of the photocatalytic nanoparticles and increasing the stability of the suspensions. Four distinct dispersions were optimized and applied as coatings onto stony materials used in the Built Heritage, such as sandstone, lime mortar, granite and limestone. Their effectiveness was assessed by assessing hydrophobicity of the surfaces (static water contact angle), photocatalytic activity and self-cleaning as well as water vapour permeability of the treated specimens. These transparent coatings demonstrated high compatibility with the construction materials of the Architectural Heritage and showed a synergistic effect rendering a minimized water absorption, self-cleaning ability evidenced by the reduced adsorption of soiling deposits and a reasonable degradation of any trace that might be adsorbed, as well as a protecting hydrophobic environment for the photocatalyst.
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    Development of photocatalytic coatings for building materials with Bi2O3-ZnO nanoparticles
    (2023) Oroz-Mateo, T. (Tamara); Alvarez-Galindo, J.I. (José Ignacio); Navarro-Blasco, I. (Iñigo); Fernandez-Acevedo, C. (Claudio); Tena-Santafé, V.M. (Víctor M.); Fernandez-Alvarez, J.M. (José María)
    The aim of this study was to develop versatile coatings that can protect the stone surfaces of Ar-chitectural Heritage. Two different 3D media, namely superhydrophobic (SPHB) and hydrooleophobic (OHB), were utilized as host matrices for nanostructured photocatalysts (Bi2O3-ZnO 8/92). These photocatalysts were sensitive to visible light to enhance their efficiency when exposed to sunlight. To prevent the nanophotocatalyst from clumping together in the 3D media, non-ionic dispersant additives (Tween20, TritonX-100, and Brij35) were incorporated. The optimized suspensions were then applied to various substrates such as sandstone, limestone, and granite. The effectiveness of the coatings was assessed by evaluating the hydrophobicity, oleo-phobicity, and photocatalytic activity of the coated substrates. The Bi2O3-ZnO photocatalyst exhib-ited higher activity in the SPHB medium compared to the OHB medium. To simulate real-life con-ditions, the coated substrates were subjected to accelerated weathering tests to predict their dura-bility. Despite a significant reduction in their thickness, the coatings demonstrated sustained hy-drophobic efficiency and self-cleaning capability after the accelerated ageing tests.