Abstract
Nanocrystalline zirconium oxide was synthesized by hydrothermal treatment of ZrO(NO3)2 and ZrOCl2 aqueous solutions at different temperatures and time in presence of hydrogen peroxide. Hydrothermal treatment of zirconium
salts (0.25 and 0.50 mol L−1) produced nanocrystalline monoclinic ZrO2 powders with narrow size distribution, which were formed by the attachment of the smaller particles with crystallites size
of 3.5 nm, estimated by means of the Scherrer’s equation and confirmed by transmission electronic microscopy. Typical monoclinic
zirconium oxide X-ray powder diffraction patterns and Raman spectra were obtained for all the crystalline powders. It was
observed that the crystallization depends strongly on the temperature, resulting in amorphous material when the synthesis
was realized at 100 °C, and crystalline with monoclinic phase when synthesized at 110 °C, independently of the salt used.
Zirconium oxide colloidal nanoparticles were formed only at hydrothermal treatments longer than 24 h. The stability of the
colloids was successfully characterized of zeta potential, showing an initial value of + 59.2 mV in acid media and isoelectric
point at pH = 5.2, in good agreement with previous studies.
salts (0.25 and 0.50 mol L−1) produced nanocrystalline monoclinic ZrO2 powders with narrow size distribution, which were formed by the attachment of the smaller particles with crystallites size
of 3.5 nm, estimated by means of the Scherrer’s equation and confirmed by transmission electronic microscopy. Typical monoclinic
zirconium oxide X-ray powder diffraction patterns and Raman spectra were obtained for all the crystalline powders. It was
observed that the crystallization depends strongly on the temperature, resulting in amorphous material when the synthesis
was realized at 100 °C, and crystalline with monoclinic phase when synthesized at 110 °C, independently of the salt used.
Zirconium oxide colloidal nanoparticles were formed only at hydrothermal treatments longer than 24 h. The stability of the
colloids was successfully characterized of zeta potential, showing an initial value of + 59.2 mV in acid media and isoelectric
point at pH = 5.2, in good agreement with previous studies.
- Content Type Journal Article
- Category Research Paper
- DOI 10.1007/s11051-010-9906-5
- Authors
- Tatiane M. Arantes, LIEC Department of Chemistry UFSCar. Rod.Washington Luis km 235 São Carlos SP 13565 Brazil
- Giovanni P. Mambrini, LIEC Department of Chemistry UFSCar. Rod.Washington Luis km 235 São Carlos SP 13565 Brazil
- Daniel G. Stroppa, LME Brazilian Synchrotron Light Laboratory Campinas SP Brazil
- Edson R. Leite, LIEC Department of Chemistry UFSCar. Rod.Washington Luis km 235 São Carlos SP 13565 Brazil
- Elson Longo, UNESP Institute of Chemistry Araraquara SP Brazil
- Antonio J. Ramirez, LME Brazilian Synchrotron Light Laboratory Campinas SP Brazil
- Emerson R. Camargo, LIEC Department of Chemistry UFSCar. Rod.Washington Luis km 235 São Carlos SP 13565 Brazil
- Journal Journal of Nanoparticle Research
- Online ISSN 1572-896X
- Print ISSN 1388-0764
No comments:
Post a Comment