التفاصيل البيبلوغرافية
العنوان: |
Titania-silica Composite with Photocatalytic Properties and Its Application on Brazilian Granite and Sandstone. |
المؤلفون: |
Grossi, Danielle, Lazar, Dolores Ribeiro Ricci, Del Lama, Eliane Aparecida, Ussui, Valter |
المصدر: |
International Journal of Architectural Heritage: Conservation, Analysis & Restoration; 2023, Vol. 17 Issue 5, p770-787, 18p |
مصطلحات موضوعية: |
THERMAL shock, SANDSTONE, GRANITE, CONTACT angle, STONE |
مستخلص: |
The aim of the study described in this article was to evaluate a product containing titania (titanium dioxide, TiO2) applied on stones — particularly two types used at Brazilian stone-built heritage sites — that have been exposed to weathering and anthropogenic activities. This product was prepared by producing a suspension of TiO2 at two concentrations (1% and 4% w/v) with tetraethyl orthosilicate (TEOS) in the presence of n-octylamine as surfactant. The characteristics of the TiO2 were then observed by scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface-area measurements, particle-size distribution analysis (CILAS) and X-ray diffraction. After applying the TiO2-TEOS composite, the stones were examined for contact angle, spectrophotometry, sorptivity, thermal shock resistance, and UV-radiation resistance. The product proved ineffective on Itararé sandstone, mainly due to its mineralogical components, as the product does not adhere to quartz. When applied on Itaquera granite, the 1% TiO2 (w/v) concentration proved to be an appropriate treatment, as it demonstrated better thermal shock resistance, photocatalytic activity, porosity maintenance, and global colour when compared to the 4% concentration. [ABSTRACT FROM AUTHOR] |
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قاعدة البيانات: |
Complementary Index |