期刊
CRYSTALS
卷 7, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/cryst7010030
关键词
colloidal nanocrystals; photocatalysis; limestone; coating; self-cleaning; hydrophobicity; stone protection
资金
- Apulia Region Funded Projects NanoApulia [MDI6SR]
- Cleaning, protection and consolidation of traditional building materials of the Puglia region [PS083]
- EC-funded 7th FP LIMPID [310177]
- ReLa VALBIOR
- SensMicro LAB
- PRIN Italian National projects [20128ZZS2H]
Rod-shaped TiO2 nanocrystals (TiO2 NRs), capped by oleic acid molecules (OLEA), were synthesized with controlled size, shape and surface chemistry by using colloidal routes. They were investigated for application as coating materials for preserving architectural stone of monumental and archaeological interest, in consideration of their self-cleaning and protection properties. For this purpose, two different deposition techniques, namely casting and dipping, were tested for the application of a nanocrystal dispersion on a defined stone type, as a relevant example of porous calcarenites, namely the Pietra Leccese, a building stone widely used in monuments and buildings of cultural and historic interest of the Apulia region (Italy). The physical properties of the stone surface were investigated before and after the treatment with the prepared nanostructured materials. In particular, colour, wettability, water transfer properties and stability of the coating were monitored as a function of time and of the application method. The self-cleaning properties of the TiO2 NRs coated surfaces were tested under simulated and real solar irradiation. The obtained results were discussed in the light of the specific surface chemistry and morphology of TiO2 NRs, demonstrating the effectiveness of TiO2 NRs as an active component in formulations for stone protection.
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