8 documents found, page 1 of 1
Photocatalytic performance of textiles coated with titanium dioxide-reduced gra...
Silva, Davide; Landi Jr, Salmon; Segundo, Iran Rocha; Afonso, Catia; Fernandes, Filipa; Nunes, Eloiza da Silva; Teixeira, VascoThe pollution caused by oil and its toxic derivatives presents a considerable risk to the public health and the environment. This work is devoted to the study of the influence of TiO2 nanoparticles immobilized on three types of textiles materials (Cotton, Entretela, and Polylactic Acid-PLA) coated with reduced graphene oxide (RGO) to be used for degradation of crude petroleum under simulated solar irradiation. ...
Thermochromism applied to transportation engineering: asphalt roads and paints
Lima Jr., Orlando; Cardoso, Pedro; Segundo, Iran Gomes Rocha; Freitas, E. F.; Costa, Manuel F. M.; Nascimento,Heriberto; Afonso, CátiaThermochromic materials change their optical response to temperature reversibly. This study explores the application of thermochromism to road engineering, which is still incipient in this area, from two perspectives. The first one is about the development of functionalized road markings (FRM) working as thermochromic sensors to alert the presence of ice on the road and, in this way, to improve road safety. The...
Asphalt binder "Skincare"? aging evaluation of an asphalt binder modified by Na...
Lima, Orlando, Jr.; Afonso, Catia; Segundo, Iran Rocha; Landi, Salmon; Homem, Natalia C.; Freitas, E. F.; Alcantara, Amanda; Branco, Veronica CasteloAging by oxidation of asphalt roadway material promotes changes in its physical, chemical, and rheological properties, affecting its hardening and accelerating the degradation of its corresponding asphalt mixture. Titanium dioxide (TiO2) has been applied in engineering investigations to promote anti-aging and photocatalytic properties. In this study, a commercial binder was modified with nano-TiO2 (using conten...
Evaluation of the best solution for the functionalization of photocatalytic, su...
Rocha Segundo, Iran Gomes da; Landi Jr., Salmon; Freitas, E. F.; Costa, Manuel F. M.; Zahabizadeh, Behzad; Cunha, Vítor M. C. F.; Soares, GraçaThis research aims to develop asphalt mixtures with new capabilities with photocatalytic, superhydrophobic, and self-cleaning capabilities. Different solutions were prepared combining nano-TiO2 and micro-PTFE on water, and ethyl alcohol and dimethyl ketone with different concentrations. The solutions were sprayed over the asphalt mixtures and the new capabilities were evaluated via decolourization of Rhodamine ...
Compositional, optical and electrical characteristics of SiOx Thin films deposi...
Carneiro, Joaquim O.; Machado, Filipe; Rebouta, L.; Vasilevskiy, Mikhail; Lanceros-Méndez, S.; Teixeira, Vasco; Costa, Manuel F. M.; Samantilleke, A. P.The influence of O<sub>2</sub> flow rate on the compositional, optical and electrical characteristics of silicon oxide (SiO<i><sub>x</sub></i>) thin films (<i>x</i> < 2) were studied in this work. The SiO<i><sub>x</sub></i> thin films were obtained by pulsed direct current (DC) magnetron sputtering (PMS) onto n-type Si wafers (and also on glass substrates) at a vacuum of 3 × 10<sup>−3</sup> Pa. Rutherford backs...
Study of Vanadium Doped ZnO Films Prepared by dc Reactive Magnetron Sputtering ...
Meng, Lijian; Teixeira, Vasco; Dos Santos, M.P.ZnO films doped with vanadium (ZnO:V) have been prepared by dc reactive magnetron sputtering technique at different substrate temperatures (RT–500 C). The effects of the substrate temperature on ZnO:V films properties have been studied. XRD measurements show that only ZnO polycrystalline structure has been obtained, no V2O5 or VO2 crystal phase can be observed. It has been found that the film prepared at low su...
The evaluation of the thermal behaviour of a mortar based brick masonry wall co...
Carneiro, Joaquim A. O.; Vasconcelos, Graça; Azevedo, Sofia; Jesus, Carlos; Palha, Carlos; Gomes, Nuno; Teixeira, VascoThe transfer of energy (in the form of heat) between the building and its surroundings affects its thermal performance. When a given building system is thermally inefficient it will require that the HVAC equipment will be in permanent activity, increasing the underlying energy costs. This work evaluates the influence of using a TiO2-coated plastering mortar in the thermal performance of a building wall model. T...
Study of vanadium doped ZnO films prepared by dc reactive magnetron sputtering ...
Meng, Lijian; Teixeira, Vasco; Santos, M. P.ZnO films doped with vanadium (ZnO:V) have been prepared by dc reactive magnetron sputtering technique at different substrate temperatures (RT–500 C). The effects of the substrate temperature on ZnO:V films properties have been studied. XRD measurements show that only ZnO polycrystalline structure has been obtained, no V2O5 or VO2 crystal phase can be observed. It has been found that the film prepared at low su...