| Texto completo | |
| Autor(es): |
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Inst Pesquisas Energet & Nucl, Av Prof Lineu Prestes 2242, Sao Paulo - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Materials Chemistry and Physics; v. 177, p. 505-511, JUL 1 2016. |
| Citações Web of Science: | 4 |
| Resumo | |
The present study reports a process to develop a porous biomorphic dysprosium doped yttrium disilicate burner from biotemplating of Luffa Cylindrica and its thermoluminescent response is evaluated. Processing parameters such as rheological behavior of the ceramic suspensions, surface chemistry of the nanoparticles, microstructure, thermal stability of the biotemplating, as well as thermoluminescent response of the nanoparticles, were investigated. Ceramic suspensions prepared at pH 10 from tetramethylammonium hydroxide, 2 wt% polyacrylic ammonium salt and 0.4 wt% carboxymethylcellulose exhibited shear thinning behavior, suitable apparent viscosity for replica method and porous microstructure as sintered. Promising thermoluminescent result of the yttrium disilicate nanoparticles was observed at 580 nm and at 180 degrees C. The burner prototype sintered at 1500 degrees C for 7 h exhibited reticulated shape similar to biotemplating, porous microstructure with mean grain size around 1 gm, no apparent cracks, pycnometric density of 3.21 g cm(-3) (80% of theoretical density; 4.04 g cm(-3)) and radiant efficiency of 13%. These results show that controlling stability of nano particles leads to form a microstructure with controlled grain size and porous distribution, which enhances porous burner efficiency. (C) 2016 Elsevier B.V. All rights reserved. (AU) | |
| Processo FAPESP: | 14/23621-3 - Desenvolvimento de materiais cerâmicos à base de ítria dopada com terras raras para aplicação na dosimetria das radiações |
| Beneficiário: | Silas Cardoso dos Santos |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |