masterThesis
Preparação de óxidos mistos de níquel e zinco nanoparticulados a partir de combustíveis alternativos
Fecha
2012-08-31Registro en:
SILVA, Rayssa Rafaelli Nunes Melo da. Preparação de óxidos mistos de níquel e zinco nanoparticulados a partir de combustíveis alternativos. 2012. 87 f. Dissertação (Mestrado em Processamento de Materiais a partir do Pó; Polímeros e Compósitos; Processamento de Materiais a part) - Universidade Federal do Rio Grande do Norte, Natal, 2012.
Autor
Silva, Rayssa Rafaelli Nunes Melo da
Resumen
The field of "Materials Chemistry" has been developing in recent years and there has
been a great increase of interest in the synthesis and chemical and physical properties of
new inorganic solids. New routes of synthesis and synthesis modified has been
developed with the aim not only to optimize the processes in laboratory scale, but also
on an industrial scale, and make them acceptable by current environmental legislation.
The phenomenology of current solid state chemistry properties coupled with the high
temperature superconductivity, ferromagnetism, porosity molecular and colors are
evidence affected by the synthesis method, which in turn can influence the
technological application of these materials. From this understanding, mixed oxides of
nickel and zinc nanoparticulate were synthesized by microwave-assisted combustion
route using three specific types of organic fuels employing the weight ratios 1:1/2 and
1:1 of cation metallic/fuel, in order to investigate the influence of such proportions to
obtain the solids. The new fuels were chosen to replace, for example, urea or glycine
that are the fuels most commonly preferred in this kind of synthesis. The powders
without heat treatment were studied by Thermogravimetric analysis (TGA), X-Ray
Diffraction (XRD) and then calcined at 900°C. After heat treatment, the samples were
characterized by analysis of X Ray Diffraction (XRD) and Scanning Electron
Microscopy (SEM). The modified synthesis route porposed was effective for obtaining
powders. Both the alternative fuels chosen as the different weight ratios employed,
influenced in the morphology and obtaining oxides