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] |
|
Copyright of International Journal of Architectural Heritage: Conservation, Analysis & Restoration is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
PDF full text from Publisher 
Full Text Finder