Characterization and nanoestructural control of silican made by flame aerosol synthesis / Caracterização e controle nanoestrutural da silica para fotonica produzida pelo metodo de aerosol em chama

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The nanostructured silica preform made by the flame aerosol method represents a strategical precursor for technological applications in photonics, such as special optical fibers and high optical transmissivity lenses for ultraviolet radiation. In order to attain such a properties, it becomes particularly important to control the nanostructured characteristics of silica preforms, such as nanoporosity and particle size distribution. In this sense, SAXS technique has been used for the characterization of silica preforms in conjunction of several other techniques, ARX, BET, MEV and FRX. Using the mathematical treatment of SAXS data by the GNOM method, structural heterogeneities in the range 1-100 nm were measured. Additional nanoscale information was observed through various effects induced by: (i) impinging a mechanical stress, (ii) thermal treatment in controlled atmosphere and precise temperature control, (iii) erbium ions doping. It was then possible to attain an effective understanding of nanostructure properties of the high purity flame aerosol silica, both on qualitative and quantitative aspects. The present result allows the control of size and size distribution of nanoparticles and nanopores, that is essential for the development and the production of advanced silica devices for photonics

ASSUNTO(S)

silica saxs porosidade nanoporosity raios x - espalhamento a baixo angulo photonics thermal treatment silica nanoparticles comunicações oticas materiais nanoestruturados nanoparticulas flame aerosol synthesis

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