Mesoporous titania-silica composites that have photocatalytic activity been synthesized by mixing ethoxysilane oligomers and titanium dioxide nanoparticles in the presence of a nonionic surfactant (n-octylamine). The resulting nanomaterials create effective adhesive crack-free coatings for stone. These give self-cleaning properties to stone improve its mechanical resistance. In addition, coating created has hydrophobic properties. For purposes comparison, another two sets materials also...

Numerous superhydrophobic materials have been developed in recent years by using a combination of two strategies: reducing the surface free energy and roughening surface. Most these procedures serious drawback involving tedious multistage processes, which prevent their large-scale application, such as on external stone similar material surfaces buildings exposed to weather. This paper describes an innovative synthesis route for producing coatings. The coating can even be produced, outdoors,...

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...

A self-cleaning nanostructured TiO2 coating has demonstrated the capacity to mitigate undesired effects from air pollution. Not only it reduces deterioration of building materials but may also prevent certain pollution-related human health problems. In this study, mesoporous TiO2/SiO2 photocatalysts were synthesized in order produce and long-lasting coatings that meet necessary requirements for outdoor applications. The products sprayed on concrete substrates their depolluting capabilities...

A novel sol-gel synthesis, in which a surfactant acts to make the pore size of gel network more coarse and uniform, is shown provide an effective alternative for consolidation stone. The new mesoporous silica avoids main inconvenience current commercial consolidants, their tendency crack inside pores Since cracking xerogels well-known drawback process, synthesis presented here can be extended other applications. Finally, preliminary studies effectiveness surfactant-templated sol...

A challenging objective in monumental stone restoration is to synthesize crack-free silica materials for application as consolidants. Hydrophobicity also a valuable property such products; it important prevent the penetration of water because main vehicle by which agents decay enter pore structure stone. We report development hydrophobic nanomaterial with restoration. Specifically, organically modified silicate (ormosil) has been synthesized co-condensation tetraethoxysilane (TEOS) and...

We have developed a simple sol–gel treatment procedure that enhances the properties of pure limestones to make them more suitable for commercial use; in particular, we improved mechanical robustness stone. When treated, stone also has enhanced hydrophobic, water-repellent, and stain-resistant properties, which been evaluated. demonstrated addition poly(dimethylsiloxane) (PDMS) silica oligomer associated with neutral catalyst, presence surfactant, accelerates gelling process; this reduction...

This article describes a sol–gel route for nanomaterials production, without volatile organic compounds (VOCs). These materials are simply obtained by mixing silica oligomer with non-ionic surfactant under ultrasonic agitation. The acts as transition catalyst and also an agent that directs the pore structure of material, reducing capillary pressure during drying. Thus, crack-free monolithic material is produced. We synthesize novel product hydrophobic properties adding OH...

As a consequence of human activities, today, we are exposed to high pollution levels that cause building materials damage and many diseases. The application TiO2 as coating on has proven the efficiency self-cleaning air de-pollution. However, its performance is limited due absorption being exclusively located at UV light. In this study, Cu-TiO2 photocatalysts were integrated into silica sol–gel synthesis manufacture new long-lasting term coatings with purification properties for...

Strong Metal−Support Interaction (SMSI) is a well-known phenomenon of heterogeneous catalysis that have not been extensively investigated in photocatalytic applications. Moreover, the reactions previously studied for photocatalysts under SMSI state are mainly restricted to energy related uses. The present work seeks explore effect induced by soft wet-chemistry Au/TiO2 photocatalyst with specific focus on environmental remediation. With this aim, developed has evaluated considering liquid,...

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...

Chemical compatibility with a wide range of materials is among the features that has driven use alkoxysilanes as consolidants in built structures. Such particularly important cementitious where reaction portlandite may generate C-S-H gel, one main hydration phases OPC. The matrix complex system, however, and its many alkoxysilanes, while poorly understood, determine treatment efficacy. This article describes detailed study individual interactions between an oligomeric alkoxysilane-based...

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...

In this study, we develop TiO2-SiO2 nanocomposites that can be employed as photoactive coatings to create surfaces with antipollution and self-cleaning properties in urban buildings. particular, anatase titanium dioxide a high percentage of {0 0 1} facets, commonly called titania nanosheet (TNS), was used active phase. This approach allows us improve the similar sols based on P25. The obtained TNS were intensively characterized by UV–Vis diffuse reflectance absorption, X-Ray diffraction...