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Multiscale Copper-uDiamond Nanostructured Composites

Nanostructured copper-diamond composites can be tailored for thermal management applications at high temperature. A novel approach based on multiscale diamond dispersions is proposed for the production of this type of materials: a Cu-nDiamond composite produced by high-energy milling is used as a nanostructured matrix for further dispersion of micrometer sized diamond. The former offers strength and microstruct...

Elemental interdiffusion in W-Ta composites developed for fusion applications

Tungsten (W) was select for an extensive use in nuclear fusion devices due to its low neutron activation, high melting point and sputtering threshold as well as low hydrogen inventory. Nevertheless, W is brittle at low and moderate temperatures, which results in abnormal thermal stress, component fracture and extra erosion under reactor operation due to inherent thermal cycling events. An attractive way to solv...

Synergistic helium and deuterium blistering in tungsten–tantalum composites

Tungsten–tantalum composites with 10 and 20 at.% Ta were prepared by ball milling W powder with Ta fibers and by consolidating the milled materials with spark plasma sintering. The composites were implanted at room temperature with He+ (30 keV with a fluence 5 1021 at/m2) and/or D+ (15 keV with a fluence 5 x 1021 at/m2) ion beams. The materials were studied by scanning and high-resolution transmission electron ...

First evaluation of a traditional portugueses alcoholic beverage prepared with ...

The alcoholic drink called ‘aguardente de zimbro’ is a traditional Portuguese alcoholic beverage made by the people living around Serra da Estrela, using the maceration of juniper berries in different distillates like arbutus spirit, marc spirit and wine spirit. Traditionally homemade for own consumption in rural families, this beverage is now sold to tourists and promoted and included in the food patrimony of ...

Nanodiamond dispersions in nanostructured metals

Tungsten–nanodiamond composite powders produced by ball milling

The major challenge in producing tungsten–nanodiamond composites by ball milling lies in successfully dispersing carbon nanoparticles in the metallic matrix while keeping carbide formation at a minimum. Processing windows for carbide minimization have been established through systematic variation of the nanodiamond fraction, milling energy and milling time. Materials characterization has been carried out by X-r...

Nickel–carbon nanocomposites: Synthesis, structural changes and strengthening m...

The present work investigates Ni–nanodiamond and Ni–graphite composites produced by mechanical synthesis and subsequent heat treatments. Processing of nickel–carbon nanocomposites by this powder metallurgy route poses specific challenges, as carbon phases are prone to carbide conversion and amorphization. The processing window for carbide prevention has been established through X-ray diffraction by a systematic...

First approach to the characterization of a traditional alcoholic drink "Aguard...

The alcoholic drink called “aguardente de zimbro” is normally presented at touristic documentation about “Serra da Estrela” and included in the food heritage of the region. However, there is a lack of technical and scientific information about this beverage. This work intends to achieve a first characterization of this product concerning its technology, and its sensory properties and physico-chemical characteri...

Caracterização de fases de carbono nano estruturado em compósitos de cobre/carbono

Aprendizagem de cuidados complexos: um desafio no caminho da parentalidade

INTRODUÇÃO: Os pais são maioritáriamente as pessoas que prestam cuidados aos filhos. A transição para a parentalidade autónoma implica, nalgumas situações, a aquisição de competências ao nível da prestação de cuidados complexos. Este ensino, treino e demonstração são praticados durante o internamento das crianças com o objectivo de promover a autonomia familiar