11 documents found, page 1 of 2
Effects of Substitution and Substrate Strain on the Structure and Properties of...
Romaguera-Barcelay, Yonny; Figueiras, Fábio Gabriel; Govea-Alcaide, Ernesto; Brito, Walter Ricardo; Filho, Henrique Duarte da FonsecaThe effects on the structure and magnetic properties of Eu1-xYxMnO3 (0.0 ≤ x ≤ 0.5) thin films due to lattice strain were investigated and compared with those obtained in equivalent composition ceramics. The films were deposited by spin-coating chemical solution onto Pt\TiO2\SiO2\Si (100) standard substrates. X-ray diffraction and Raman spectroscopy measurements revealed that all films crystallize in orthorhomb...
Characterization of stainless steel spent pickling sludge and prospects for its...
Castro, Fernando; Tavares, Pedro B.; Cristelo, Nuno; Teixeira, Tiago; Garcia, Joana F.; Parreira, Nuno Miguel GermanoFluorspar is considered a critical raw material for the European Union, due to its industrial uses and lack of sufficient extraction in European countries. It is a source for hydrofluoric acid manufacture, this latter chemical being employed, among other uses, in the pickling of stainless steels. From this latter activity, sludge is generated due to the need for used water treatment. In this article, we report ...
Narrow optical gap ferroelectric Bi2ZnTiO6 thin films deposited by RF sputtering
Figueiras, Fábio G.; Fernandes, J. Ramiro A.; Silva, J. P. B.; Alikin, Denis O.; Queirós, Eugénia C.; Bernardo, César Rui Freitas; Barcelay, Y. R.This work reports the deposition of single phase Bi2ZnTiO6 thin films onto Pt/Si-based substrates using the RF-sputtering method and the respective structural, morphological, optical and local ferroelectric characterization. The thin film grows in the polycrystalline form with tetragonal P4mm symmetry identified by X-ray diffraction. The lack of a spatial inversion centre was confirmed by the second harmonic ge...
Hybrid magnetic graphitic nanocomposites for catalytic wet peroxide oxidation a...
Ribeiro, Rui; Silva, Adrián; Tavares, Pedro B.; Figueiredo, José; Faria, Joaquim; Gomes, HelderFe3O4, with a lattice parameter a = 8.357 Å and average particle size of 12.5 ± 3.6 nm, was successfullyencapsulated within a graphitic structure by a hierarchical co-assembly approach, followed by thermalannealing. The resulting material was denoted as MGNC—magnetic graphitic nanocomposite. MGNC pos-sesses average core size of 109 ± 35 nm (mainly composed by agglomerates of magnetic nanoparticles),stability up...
Hybrid magnetic graphitic nanocomposites towards catalytic wet peroxide oxidati...
Ribeiro, Rui; Rodrigues, Raquel Oliveira; Silva, Adrián; Tavares, Pedro B.; Carvalho, Ana Maria; Figueiredo, José; Faria, Joaquim; Gomes, HelderMagnetite, nickel and cobalt ferrites were prepared and encapsulated within graphitic shells, resulting in three hybrid magnetic graphitic nanocomposites. Screening experiments with a 4-nitrophenol aqueous model system (5 g L −1 ) allowed to select the best performing catalyst, which was object of additional studies with the liquid effluent resulting from a mechanical biological treatment plant for municipal so...
Multiple manipulators path planning using double A∗
Tavares, Pedro B.; Lima, José; Costa, Pedro; Moreira, António Paulo G. M.Streamlining automated processes is currently undertaken by developing optimization methods and algorithms for robotic manipulators. This paper aims to present a new approach to improve streamlining of automatic processes. This new approach allows for multiple robotic manipulators commonly found in the industrial environment to handle different scenarios, thus providing a high-flexibility solution to automated ...
Core-shell nanocomposites prepared by hierarchical co-assembly: the role of the...
Ribeiro, Rui; Silva, Adrián; Tavares, Pedro B.; Figueiredo, José; Faria, Joaquim; Gomes, HelderThe diffraction pattern of Fe3O4 (not shown) confirmed the presence of only one phase, corresponding to magnetite with a lattice parameter a = 8.357 Å and a crystallite size of 16.6 ± 0.2 nm. The diffraction pattern of MGNC (not shown) confirmed the presence of a graphitic phase, in addition to the metal phase, suggesting that Fe3O4 nanoparticles were successfully encapsulated within a graphitic structure durin...
Haemocompatibility of iron oxide nanoparticles synthesized for theranostic appl...
Rodrigues, Raquel Oliveira; Bañobre-López, Manuel; Gallo, Juan; Tavares, Pedro B.; Silva, Adrián; Lima, Rui A.; Gomes, HelderThe poor heating efficiency of the most reported magnetic nanoparticles (MNPs), allied to the lack of comprehensive biocompatibility and haemodynamic studies, hampers the spread of multifunctional nanoparticles as the next generation of therapeutic bio-agents in medicine. The present work reports the synthesis and characterization, with special focus on biological/toxicological compatibility, of superparamagnet...
A new microfluidic methodology to assess the haemocompatibility of magnetic nan...
Rodrigues, Raquel Oliveira; Bañobre-López, Manuel; Gallo, Juan; Tavares, Pedro B.; Silva, Adrián; Gomes, Helder; Lima, Rui A.The remarkable physicochemical properties of magnetic nanoparticles (MNPs) at the nanoscale have boosted the development of new and promising strategies for the simultaneous diagnosis and treatment of diseases, particularly in cancer therapy Ð the so-called theranostic applications (1). In these strategies, the intrinsic superparamagnetic properties of MNPs have been exploited to gain access into multifunctiona...
Development and characterization of magnetic nanoparticles for theranostic appl...
Rodrigues, Raquel Oliveira; Bañobre-López, Manuel; Gallo, Juan; Tavares, Pedro B.; Lima, Rui A.; Silva, Adrián; Gomes, HelderMagnetic nanoparticles (MNPs), especially iron oxide nanoparticles, have attracted much attention in the last decades due to their remarkable physicochemical and magnetic properties. These properties coupled with their low toxicological effects, make MNPs ideal for biomedical applications1. In addition, chemical functionalization with specific biocompatible targeting molecules provides them with the ability to ...