Ormellese M. – TechConnect Briefs

Photocatalytic Activity of Immobilized Nano-TiO2 in Complex Wastewaters: Case Study of Multiple Dye Composition

Bellè U., De Flaviis L., Diamanti M.V., Ormellese M., Pedeferri M., Politecnico di Milano, IT

Titanium dioxide (TiO2) is widely investigated for its photocatalytic properties and for the possibility of obtaining nanotubular oxide films with high specific surface area directly immobilized on a substrate. In the present work, nanotubular TiO2 [...]

Design of Experiment Based Prediction of Passivity Breakdown Potential for 304L Stainless Steel

Azimi Dastgerdi A., Bellè U., Brenna A., Ormellese M., Pedeferri M., Bolzoni F., Politecnico di Milano, IT

Stainless steels usually have a good corrosion resistance because of the protective passive film that forms on the surface, however they are prone to localized corrosion (pitting and crevice) due to the breakdown of passive [...]

Enhancement of pure titanium localized corrosion resistance by chemical oxidation

Prando D., Brenna A., Diamanti M.V., Ormellese M., Pedeferri M.P., Politecnico di Milano, IT

Titanium and its alloys are widely appreciated for their high corrosion resistance in environments that are critical even for high-end stainless steel (duplex UNS S31803 and UNS S32750), such as concentrated chlorides [1]. This resistance [...]

Self-cleaning ability and cooling effect of TiO2-containing mortars

Diamanti M.V., Paolini R., Zinzi M., Ormellese M., Fiori M., Pedeferri MP., Politecnico di Milano, IT

This work focuses on the characterization of a self-cleaning and photocatalytic system for building façades, aimed at improving urban surfaces and the surrounding air quality, and decreasing energy consumption. Mortars containing anatase TiO2 nanopowders were [...]

Self-cleaning ability and cooling effect of TiO2-containing mortars

Diamanti M.V., Paolini R., Zinzi M., Ormellese M., Fiori M., Pedeferri MP., Politecnico di Milano, IT

This work focuses on the characterization of a self-cleaning and photocatalytic system for building façades, aimed at improving urban surfaces and the surrounding air quality, and decreasing energy consumption. Mortars containing anatase TiO2 nanopowders were [...]

A proposal of AC corrosion mechanism in cathodic protection

Brenna A., Diamanti M.V., Lazzari L., Ormellese M., Politecnico di Milano, IT

The research proposes an electrochemical mechanism of AC-corrosion in CP condition. Electrochemical tests were carried out on carbon steel in simulated soil conditions to identify AC corrosion risk related parameters during cathodic polarization, like AC [...]

An experimental and theoretical study of the inhibition mechanism of organic substances in concrete

Diamanti M.V., Ormellese M., Perez-Rosales E.A., Pedeferri MP., Raffaini G., Ganazzoli F., Politecnico di Milano, IT

Corrosion inhibitors are one of the preventative techniques used to prevent chloride-induced corrosion in reinforced concrete structures. Several commercial inhibitors are available on the market, but their efficiency as well as their inhibitive mechanism are [...]

Influence of pigments on the photoactivity of TiO2-containing colored mortars compared with white mortars and sol-gel TiO2 application route

Diamanti M.V., Del Curto B., Ormellese M., Pedeferri MP., Politecnico di Milano, IT

In previous works, TiO2-containing commercial mortars were proved to show photoactivated properties due to the well-known semiconducting structure of titanium dioxide in anatase form. Anatase was added to white mortars in form of suspension or [...]

Morphological variations on titanium by AC anodizing

Diamanti M.V., Ormellese M., Pedeferri MP., Politecnico di Milano, IT

Besides the widely investigated photoinduced properties of its oxides, a primary branch of application of anodized titanium is the production of biomedical implants, where a controlled roughness can lead to improvements in cell adhesion and [...]

Photoactivity of nitrogen-doped anodic TiO2 under UV and VIS light irradiation

Diamanti M.V., Ormellese M., Pedeferri M.P., Politecnico di Milano, IT

Titanium dioxide is probably the most efficient among the known photocatalysts, and undoubtedly the most studied one. An appealing route to tune obtain TiO2 films morphology and structure is to exploit the anodizing process to [...]