11 documents found, page 1 of 2
Eudragit E100/Hesperidin 3D Printing Filaments: Preparation, Characterization, ...
Cardoso, Pedro H. N.; Oliveira, Carlos Yure B.; Nunes, Mylena; Tavares, Ginetton F.; Faia, Pedro M.; Araújo, Evando S.The importance of the Eudragit® E100 copolymer (E100) is recognized in the pharmaceutical industry as a pH-dependent coating material in conventional oral administration dosage applications, where a modified release profile is required. On the other hand, its arrangement for 3D printing of cylindrical-shaped filaments containing drugs (to produce customized pharmaceuticals), is still scarce in the literature, a...
Computational Fluid Dynamic Modelling of Fully-Suspended Slurry Flows in Horizo...
Messa, Gianandrea Vittorio; Yang, Qi; Rasteiro, Maria da Graça; Faia, Pedro M.; Matoušek, Vaclav; Silva, Rui C.; Garcia, FernandoThis research work is a significant step toward further understanding of the β-σ two-fluid model for the simulation of fully-suspended slurry flows in pipeline systems, with the goal of enhancing its potential for scientific research and engineering applications. Particularly, the focus of the study is the characterization and handling of the two main empirical coefficients of the model, namely, β and σ, which ...
A Review on the Use of Metal Oxide-Based Nanocomposites for the Remediation of ...
Araújo, Evando S.; Pereira, Michel F. G.; da Silva, Georgenes M. G.; Tavares, Ginetton F.; Oliveira, Carlos Y. B.; Faia, Pedro M.The improper disposal of toxic and carcinogenic organic substances resulting from the manufacture of dyes, drugs and pesticides can contaminate aquatic environments and potable water resources and cause serious damage to animal and human health and to the ecosystem. In this sense, heterogeneous photocatalysis stand out as one effective and cost-effective water depollution technique. The use of metal oxide nanoc...
Enhancing Polyantimonic-Based Materials’ Moisture Response with Binder Content ...
Mendes, Sofia; Kurapova, Olga; Faia, Pedro M.Humidity sensors are of huge importance in diverse domains. Several types of materials present a moisture-sensing capacity; however, frequently, their electrical response does not display time stability. Due to its high thermal stability, high ionic conductivity, and different conduction mechanism contributing to its overall conductivity, polyantimonic acid (PAA) is seen as a promising material for humidity-sen...
Effect of Nb5+ and In3+ Ions on Moisture Sensitivity of Electrospun Titanium/...
Silva, Georgenes M. G.; Leão, Victor N. S.; Pereira, Michel F. G.; Faia, Pedro M.; Araújo, Evando S.In this work, Nb5+ and In3+ ions were used as dopants in titanium/tungsten oxide nanostructures that are produced by the electrospinning and sintering process, for relative humidity (RH) detection. The microstructural properties were investigated by SEM, EDS, XRD, Raman and FTIR techniques. The electrical response characterization of the samples was performed by electrical impedance spectroscopy in the range of...
Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Condu...
Kurapova, Olga Yu.; Faia, Pedro M.; Zaripov, Artem A.; Pazheltsev, Vasily V.; Glukharev, Artem A.; Konakov, Vladimir G.The development of novel proton-conducting membrane materials for electrochemical power units, i.e., low temperature fuel cells (FCs), efficiently working up to 300 C, is a critical problem related to the rapid shift to hydrogen energy. Polyantimonic acid (PAA) is characterized by high conductivity, sufficient thermal stability and can be regarded as a prospective proton-conducting material. However, the fabric...
Zn2+-Doped TiO2:WO3 Films Prepared by Electrospinning and Sintering: Microstruc...
Silva, Georgenes M. G.; Leão, Victor N. S.; Pereira, Michel F. G.; Faia, Pedro M.; Araújo, Evando S.In this work, Zn2+-doped TiO2:WO3 nanostructured films, with different doping levels, were produced by electrospinning followed by sintering, and tested as potential materials for relative humidity (RH) detection. The materials microstructure was investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray...
Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical ...
Faia, Pedro M.; Libardi, Juliano; Barbosa, Itamar; Araújo, Evando S.; de Oliveira, Helinando P.*e study of selective metal oxide-based binary/ternary systems has received increasing interest in recent years due to the possibility of producing e2cient new ceramic materials for relative humidity (RH) detection, given the superior properties of the mixed compounds in comparison with pristine ones. *e aim of this work was focused on preparation and characterization of non-doped and Nb2O5-doped TiO2 : WO3 pai...
Hybrid ZnO/TiO2Loaded in Electrospun Polymeric Fibers as Photocatalyst
Araújo, Evando S.; Libardi, Juliano; Faia, Pedro M.; de Oliveira, Helinando P.Hybrid ZnO/TiO2 nanoparticles were applied as potential photocatalyst agents incorporated into electrospun fibers of enteric block copolymers.The resistance of fibers avoids aggregation and contributes to prolonged action of semiconductor nanoparticles under continuous light irradiation. Such behavior is attributed to the minimal aggregation degree and elevated efficiency of photodegradation of modified nanopar...
TiO2:WO3 composite humidity sensors doped with ZnO and CuO investigated by impe...
Faia, Pedro M.; Jesus, Emanuel L.; Louro, Cristina S.For impedance-type sensors based on semiconducting metal oxides, the overall conduction mechanisms strongly influence the magnitude and the direction of the sensor signal variation. For humidity, in particular, the electronic/ionic charge-transfer reactions that take place at the semiconductor surface can be used to monitor and control it. In recent years, various mechanisms have been proposed to explain the va...