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Influence of pH on the incorporation and growth of Pb2CrO5 crystallites in silica matrix

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Abstract

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 °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.

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Acknowledgments

The authors gratefully acknowledge the financial support of the Brazilian research funding agencies FAPESP and CNPq. The authors also would like to thank the Electron Microscopy Laboratory (LME) of Brazilian Sínchrotron Light Laboratory (LNLS) for the TEM analysis using JEM 2100 HTP microscope.

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Correspondence to Vinícius D. Araújo.

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Araújo, V.D., Avansi, W., Paris, E.C. et al. Influence of pH on the incorporation and growth of Pb2CrO5 crystallites in silica matrix. J Sol-Gel Sci Technol 59, 488–494 (2011). https://doi.org/10.1007/s10971-011-2517-5

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  • DOI: https://doi.org/10.1007/s10971-011-2517-5

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