Influence of pH on the incorporation and growth of Pb2CrO5 crystallites in silica matrix
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Data
2011-09-01
Autores
Araujo, Vinicius D.
Avansi, Waldir
Paris, Elaine C. [UNESP]
Maia, Lauro J. Q.
Bernardi, Maria I.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Springer
Resumo
Pb2CrO5 nanoparticles were embedded in an amorphous SiO2 matrix by the sol-gel process. The pH and heat treatment effects were evaluated in terms of structural, microstructural and optical properties from Pb2CrO5/SiO2 compounds. X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), energy dispersive spectroscopy (EDS), and diffuse reflectance techniques were employed. Kubelka-Munk theory was used to calculate diffuse reflectance spectra that were compared to the experimental results. Finally, colorimetric coordinates of the Pb2CrO5/SiO2 compounds were shown and discussed. In general, an acid pH initially dissolves Pb2CrO5 nanoparticles and following heat treatment at 600 A degrees C crystallized into PbCrO4 composition with grain size around 6 nm in SiO2 matrix. No Pb2CrO5 solubilization was observed for basic pH. These nanoparticles were incorporated in silica matrix showing a variety of color ranging from yellow to orange.
Descrição
Palavras-chave
Pb2CrO5, SiO2, Sol-gel, Silica incorporation
Como citar
Journal of Sol-gel Science and Technology. Dordrecht: Springer, v. 59, n. 3, p. 488-494, 2011.