A5051380877- Building materials and conservation
- Surface Modification and Superhydrophobicity
- Aerogels and thermal insulation
- Conservation Techniques and Studies
- Cultural Heritage Materials Analysis
- Concrete and Cement Materials Research
- TiO2 Photocatalysis and Solar Cells
- Adhesion, Friction, and Surface Interactions
- Microbial Applications in Construction Materials
- Plant Surface Properties and Treatments
- Advanced Sensor and Energy Harvesting Materials
- Silicone and Siloxane Chemistry
- Icing and De-icing Technologies
Universidad de Cádiz
2016-2022
Impregnation treatments are one of the alternatives to protect concrete-based building and monuments from weathering degradation. However, it is important consider chemical compatibility reaction products with material. The impregnation product studied here consists a silica oligomer able polymerize, by simple sol-gel process, inside pore structure concrete. In this work, we investigate ability treatment produce C-S-H gel in contact cement paste. A complete characterization demonstrated that...
Nowadays, producing building surfaces that prevent water and oil uptake which present self-cleaning activity is still a challenge. In this study, amphiphobic (superhydrophobic oleophobic) were successfully produced. A simple low-cost process was developed, applicable to large-scale surfaces, according the following procedure: (1) by spraying SiO2 nanocomposite produces closely-packed nanoparticle uniform topography; (2) functionalizing previous coating with fluorinated alkoxysilane, high...
Water and waterborne decay agents (e.g. salts, microorganisms) are commonly associated with undesired alterations damages on concrete elements. A strategy to mitigate their impact is decrease water retention in the material either by surface treatments or admixtures. In this work, hydrophobic concretes were developed addition of a sol containing TEOS PDMS oligomers, synthetized surfactant-assisted sol-gel route, as an admixture treatment. The performance was similar for both application...
Superhydrophobic surfaces present promising applications in the protection of building materials, such as self-cleaning effect promoted by their high water-repellent properties. However, these easily lose properties when exposed to oil contaminants. This is a critical weak point for application facades, which are environmental pollutants hydrocarbons and vandalism (e.g., grafitti). A viable strategy remove oils produce superhydrophilic surfaces, underwater superoleophobic behavior. In case...
Superhydrophobic materials can find promising applications in the field of building. However, their application has been very limited because synthesis routes involve tedious processes, preventing large-scale application. A second drawback is related to short-term life under outdoor conditions. simple and low-cost route for producing superhydrophobic surfaces on building developed effectiveness durability clay roof tiles are evaluated. Specifically, an organic–inorganic hybrid gel containing...
Abstract Water is the main vehicle of decay agents in Cultural Heritage building materials exposed to weathering. In this work, a simple method produce superhydrophobic/oleophobic coatings materials, including under outdoors conditions, has been developed. addition, study behavior developed on different substrates (limestone, granite, concrete and wood) reported. The addition 40 nm-SiO 2 nanoparticles fluoroalkylsilane reduces surface energy produces Cassie-Baxter all evaluated. It promotes...
An effective procedure has been developed to consolidate and hydrophobize decayed monumental stones by a simple sol-gel process. The sol contains silica oligomer, nanoparticles surfactant, preventing gel cracking. effectiveness of the process on biocalcareous stone samples from an 18th century cathedral evaluated, it was found that creates linking bridges between mineral grains stone. Silica produced significant increase in mechanical resistance cohesion application additional fluorinated...
A novel alkoxysilane-based product was applied on limestone samples from a Roman archaeological site. The study consisted of an initial phase to evaluate site environmental conditions in order choose the most suitable type be applied. decay that produced is mainly caused by natural action, with water being main vehicle for agents. Thus, effectiveness innovative hydrophobic/consolidant properties and two commercial products (consolidant hydrophobic agent) were evaluated Acinipo site, under...
Although silicon alkoxides (especially ethylsilicates) have long been used as consolidants of weathered stone monuments, their physical properties are not ideal. In this study, an innovative procedure for the consolidation sedimentary rocks was developed that combines use organometallic and alkylamine catalysts with addition well-defined nanoparticles exhibiting a narrow size distribution centered at ca. 10 nm. As suitable test material, Pietra di Lecce limestone selected because its color...
Even if silicon alkoxides (especially ethylsilicates) have long been used as consolidants of weathered stone monuments, their physical properties are not ideal. In this study, an innovative procedure for the consolidation sedimentary rocks was developed that combines use organometallic and alkylamine catalysts with addition well-defined nanoparticles exhibiting a narrow size distribution centered at ca 10 nm. As suitable test material, Pietra di Lecce limestone selected because its color...