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Article

TiO2 Nanocrystal Based Coatings for the Protection of Architectural Stone: The Effect of Solvents in the Spray-Coating Application for a Self-Cleaning Surfaces

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CNR-IPCF, Consiglio Nazionale delle Ricerche, Istituto per i Processi Chimico-Fisici, S.S. Bari 70126, Italy
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CNR-IBAM, Consiglio Nazionale delle Ricerche Istituto per i Beni Archeologici e Monumentali, Prov.le Lecce-Monteroni, 73100 Lecce, Italy
*
Authors to whom correspondence should be addressed.
Present address: Department of Chemistry, Durham University, Durham DH1 3L, UK
Coatings 2018, 8(10), 356; https://doi.org/10.3390/coatings8100356
Received: 25 July 2018 / Revised: 1 October 2018 / Accepted: 3 October 2018 / Published: 5 October 2018
(This article belongs to the Special Issue Nanostructured Thin Films)
A colloidal route was exploited to synthesize TiO2 anisotropic nanocrystal rods in shape (TiO2 NRs) with a surface chemistry suited for their dispersibility and processability in apolar organic solvents. TiO2 NRs were dispersed in chloroform and n-heptane, respectively, and the two resulting formulations were investigated to identify the optimal conditions to achieve high-quality TiO2 NR-based coatings by the spray-coating application. In particular, the two types of TiO2 NR dispersions were first sprayed on silicon chips as a model substrate in order to preliminarily investigate the effect of the solvent and of the spraying time on the morphology and uniformity of the resulting coatings. The results of the SEM and AFM characterizations of the obtained coatings indicated n-heptane as the most suited solvent for TiO2 NR dispersion. Therefore, an n-heptane dispersion of TiO2 NRs was sprayed on a highly porous limestone—Lecce stone—very commonly used as building material in historic constructions and monuments present in Apulia Region (Italy). A comprehensive physical-chemical investigation of the TiO2 NR based treatment on the surface of the stone specimens, including measurements of colour variation, static contact angle, water transfer properties, and morphological characterization were performed. Finally, the photocatalytic properties of the coatings were assessed under solar irradiation by using Lecce stone specimens and Methyl Red as a model target compound. The obtained results demonstrated that TiO2 NRs based coatings can be successfully applied by spray-coating resulting in an effective photocatalytic and hydrophobic treatment, which holds great promise as a material for the environmental protection of architectural stone in the field of cultural heritage conservation. View Full-Text
Keywords: colloidal nanocrystals; photocatalysis; stone protection; spray-coating colloidal nanocrystals; photocatalysis; stone protection; spray-coating
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MDPI and ACS Style

Petronella, F.; Pagliarulo, A.; Truppi, A.; Lettieri, M.; Masieri, M.; Calia, A.; Curri, M.L.; Comparelli, R. TiO2 Nanocrystal Based Coatings for the Protection of Architectural Stone: The Effect of Solvents in the Spray-Coating Application for a Self-Cleaning Surfaces. Coatings 2018, 8, 356. https://doi.org/10.3390/coatings8100356

AMA Style

Petronella F, Pagliarulo A, Truppi A, Lettieri M, Masieri M, Calia A, Curri ML, Comparelli R. TiO2 Nanocrystal Based Coatings for the Protection of Architectural Stone: The Effect of Solvents in the Spray-Coating Application for a Self-Cleaning Surfaces. Coatings. 2018; 8(10):356. https://doi.org/10.3390/coatings8100356

Chicago/Turabian Style

Petronella, Francesca, Antonella Pagliarulo, Alessandra Truppi, Mariateresa Lettieri, Maurizio Masieri, Angela Calia, M. Lucia Curri, and Roberto Comparelli. 2018. "TiO2 Nanocrystal Based Coatings for the Protection of Architectural Stone: The Effect of Solvents in the Spray-Coating Application for a Self-Cleaning Surfaces" Coatings 8, no. 10: 356. https://doi.org/10.3390/coatings8100356

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