Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/63394
Type: Artigo de periódico
Title: Nanostructures of sodium titanate/zirconium oxide
Author: Rodrigues, CM
Ferreira, OP
Alves, OL
Abstract: In this work is reported the synthesis of nanotubes and nanoribbons from mixed oxides (Ti(1-x) Zr (x) O(2)center dot nH(2)O), employing hydrothermal treatment in a highly alkaline medium. The morphology and crystal structure of the products obtained via hydrothermal treatment depend on the value of x. For example, for x equal to 0 and 0.50 were observed the presence of nanotubes (diameter around 9 nm) and nanoribbons (diameter around 200 nm), respectively. However, for x values above 0.50, there was no morphological change. Regarding the crystalline structure of these samples, for x equal to 0 was observed the sodium titanate phase; already for x values up to 0.50, we observed the presence of two crystalline phases: sodium titanate and tetragonal ZrO(2). For x values above 0.50, only tetragonal ZrO(2) was observed. Furthermore, only the product obtained from x equal to 0.15 was observed the presence of three-dimensional flower-like arrangements. The results obtained by the characterization techniques showed the segregation of zirconium after hydrothermal treatment of precursors with x less or equal to 0.50. Thus, we describe the important role that Ti/Zr molar ratio of the precursor plays on the morphology and crystalline phase of the products formed by hydrothermal treatment.
Subject: Hydrothermal treatment
Mixed oxide
Nanotubes
Nanoribbons
Synthesis
Country: Holanda
Editor: Springer
Rights: fechado
Identifier DOI: 10.1007/s11051-010-9985-3
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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