Repositório do Conhecimento Institucional do Centro Universitário FEI
 

Engenharia de Materiais

URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/17

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Filtros

2016 - 20172

Configurações

Autor: search.filters.author.Bonse B.C.Periódico: search.filters.ispartof.Applied Physics A: Materials Science and Processing

Resultados da Pesquisa

Agora exibindo 1 - 2 de 2
  • N/D
    Artigo 10 Citação(ões) na Scopus
    Process parameters in the manufacture of ceramic ZnO nanofibers made by electrospinning
    (2017) Nonato R.C.; Morales A.R.; Rocha M.C.; Nista S.V.G.; Mei L.H.I.; Bonse B.C.
    © 2016, Springer-Verlag Berlin Heidelberg.Zinc oxide (ZnO) nanofibers were prepared by electrospinning under different conditions using a solution of poly(vinyl alcohol) and zinc acetate as precursor. A 23 factorial design was made to study the influence of the process parameters in the electrospinning (collector distance, flow rate and voltage), and a 22 factorial design was made to study the influence of the calcination process (time and temperature). SEM images were made to analyze the fiber morphology before and after calcination process, and the images were made to measure the nanofiber diameter. X-ray diffraction was made to analyze the total precursor conversion to ZnO and the elimination of the polymeric carrier.
  • N/D
    Artigo 11 Citação(ões) na Scopus
    Solution parameters in the manufacture of ceramic ZnO nanofibers made by electrospinning
    (2016) Nonato R.C.; Morales A.R.; Vieira A.F.M.; Nista S.V.G.; Mei L.H.I.; Bonse B.C.
    © 2016, Springer-Verlag Berlin Heidelberg.Zinc oxide (ZnO) nanofibers were prepared by electrospinning from zinc acetate (ZnAc) as precursor under different conditions. The influence of the solution parameters was studied considering type of solvent, polymer molecular weight and concentration of the components. This investigation was carried out in two stages. In the first step, a 23 factorial design was performed considering the following variables: molecular weight of poly(vinyl alcohol) (PVA), amounts of PVA and ZnAc, and water or a mix of water/alcohol as solvents. In the second step, the optimized solution of the first step was then used to create a 22 factorial design, considering the concentrations of PVA and ZnAc to improve process efficiency. The solutions were analyzed in terms of viscosity, electrical conductivity and surface tension. Fiber morphology was analyzed by scanning electron microscopy, and average diameter was determined. The formation of ZnO was evidenced by X-ray diffraction.