preservation of historical stone surfaces by tio2 nanocoatings

基于TiO₂纳米涂层的历史石质表面保护

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ID: 227989
2015
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Abstract
We proposed the application of titanium dioxide (TiO2) for the preservation of historical (architectural, monumental, archaeological) stone surfaces. Solar light can activate the photocatalytic effect of TiO2 nanoparticles: heterogeneous photocatalysis is the key factor for the development of self-cleaning, depolluting and biocidal treatments able to photochemically degrade external damaging materials and prolong the durability of treated substrates, maintaining their original aspect and limiting ordinary cleaning activities. In this study, TiO2 nanoparticles dispersed in an aqueous colloidal suspension were applied directly on travertine, a light-colored limestone, by spray-coating in order to obtain a nanometric film on stone samples. To assess the feasibility of use of TiO2, we studied the characteristics of the nanocoating-stone system by monitoring the microscopic features of the coatings, the aesthetical changes induced to coated surfaces and the self-cleaning efficiency. We also monitored the self-cleaning ability over time during an accelerated ageing process to evaluate the durability of TiO2-based treatments. We confirmed both compatibility and effectiveness of TiO2 coating in the short term, anyway its efficiency decreased after artificial ageing. Further studies are necessary to better evaluate and eventually improve the stability of self-cleaning efficiency over prolonged time for outdoor stone surfaces.
本研究提出了将二氧化钛（TiO2）应用于历史（建筑、纪念性及考古）石质表面保护的方法。太阳光能够激活TiO2纳米颗粒的光催化效应：多相光催化是开发具备自清洁、降解污染物和杀菌功能处理技术的关键因素，此类技术能够通过光化学反应降解外部有害物质，延长经处理基底的耐久性，在保持其原始外观的同时减少日常清洁维护。在本研究中，将分散于水性胶体悬浮液中的TiO2纳米颗粒通过喷涂法直接施加于一种浅色石灰岩（洞石）表面，以在石材样品上形成纳米级薄膜。为评估TiO2的应用可行性，我们通过监测涂层的微观特征、涂层表面产生的外观美学变化以及自清洁效率，对该“纳米涂层-石材”体系的特性进行了研究。此外，我们还在加速老化过程中对自清洁能力随时间的变化进行了监测，以评估基于TiO2处理的耐久性。结果证实了TiO2涂层在短期内的相容性与有效性，但其效率在人工老化后有所下降。未来仍需开展进一步研究，以更好地评估并最终提高户外石材表面自清洁效率的长期稳定性。
Reference Key
goffredo2015coatingspreservation Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Giovanni Battista Goffredo;Placido Munafò
Journal die pharmazie
Year 2015
DOI
10.3390/coatings5020222
URL
http://www.mdpi.com/2079-6412/5/2/222
Keywords
photocatalysis titanium dioxide civil engineering (general)

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