Matéria (Rio de Janeiro)

http://www.scielo.br/scielo.php?script=sci_issues&pid=1517-7076&lng=pt&nrm=iso

List of Papers (Total 63)

Preparação e caracterização de pós e filmes finos de BaTiO3 sintetizados via método Pechini

In recent years the use of barium titanate (BaTiO3) in ceramics industry technology and optoelectronic devices has increased due to their ferroelectric, thermoelectric, piezoelectric and optical properties. The objective of this study was to synthesize and characterize amorphous powders and thin films of barium titanate (BaTiO3), through the Pechini method. These powders were...

Avaliação de concreto de cimento Portland contendo resíduos de PET

This work aims to verify the influence of poly (ethylene terephthalate) - PET - wastes additions on the concrete mechanical strength. The concrete used was prepared with a Portland cement. The PET was used in the as received shape from the packing recycling industry. The wastes were used as substitutes of concrete aggregates. For each waste type four mixtures (10, 20, 30 and 40...

Efecto de las variables experimentales sobre la microdureza en aleaciones Al-6Si-3Cu-xMg T6

Three Al-6Si-3Cu-xMg (x = 0.59, 3.80 and 6.78 wt. %) alloys were produced using conventional ingot casting metallurgy and melt-spinning. The study was focused to investigate the effect of Magnesium content and aging time ant temperature on precipitates and microhardness. Obtained alloys were solution heat treated at 480 ºC for 12 h and aged at 150, 180 and 210 °C for times...

Blendas SAN/NBR: influência do teor de acrilonitrila e da viscosidade da borracha nitrílica nas propriedades mecânicas

Aiming the development of high toughness polymeric materials, poly(butadiene-co-acrylonitrile) rubbers (NBRs) with acrylonitrile (AN) contents varying from 32.9 to 45.7% were incorporated to poly(styrene-co-acrylonitrile) (SAN) by monoscrew extrusion followed by injection molding. Addition of NBR resulted in significant improvements in the impact strength and the elongation at...

Propriedades ópticas de amostras policristalinas LiGaSiO4 contendo Fe3+ como impureza substitucional

The proposal of this work was the investigation of optical properties of LiGaSiO4 samples using Fe3+ ions as substitucional impurity. Oxide materials doped with transition metals can present broad absorption and emission bands in visible and near infrared regions. These bands are tunable and allow various applications, in medicine, communications and solid state lasers, for...