Publications by authors named "Orlando Favoni"
Article Synopsis
- Adding TiO nanoparticles (NPs) to polymeric paints can create self-cleaning coatings, but it might also lead to issues like polymer degradation and the release of harmful chemicals.
- A new synthesis method for nonmetal-doped TiO-NPs using waste materials minimizes these negative effects while enhancing photocatalytic properties.
- The modified TiO-NPs demonstrated impressive pollutant removal efficiency (96%) under sunlight or UV light and improved stability in water-based paints, primarily due to reduced recombination rates of charge carriers.
The ability of a photocatalyst to degrade a target pollutant is a commonly used method to assess its effectiveness for environmental applications, while ultraviolet-visible (UV-vis) spectroscopy and spectroscopic ellipsometry are conventional techniques for the estimation of a semiconductor band gap. In this work, an array of six light-emitting diodes (LEDs), characterized by different emission peaks between 470-370 nm and absorbed power of 3 W, was implemented into an existing standard testing apparatus for the testing of nitrogen oxides degradation in air. The abatement indexes, obtained under different LEDs irradiation, were firstly compared to the ones determined according the standard and, secondly, correlated with the measured LED emission spectrum, in order to estimate the photocatalyst band gap.
View Article and Find Full Text PDFObjective: To investigate the short-term optical, chemical and morphological changes in Invisalign appliances.
Methods: One 'as-received' Invisalign aligner, one 'as-received' Invisalign aligner immersed in artificial saliva for 14 days and 10 Invisalign aligners worn by 10 randomly selected patients for 14 days were used. Fourier'transform infra-red microspectroscopy was used to characterise any molecular changes on the surfaces of the appliances, spectrophotometry was used to evaluate any changes in colour and transparency, scanning electron microscopy and energy dispersive X-ray microanalysis were used to examine the surface morphology and elemental composition of deposits on the surfaces of the aligners and gas chromatography-mass spectrometry was used to identify substances released from the aligners into the artificial saliva.