| Texto completo | |
| Autor(es): |
Segatelli, Mariana G.
[1, 2]
;
Kaneko, Manuela L. Q. A.
[1]
;
Silva, Viviane P.
[1]
;
Yoshida, Inez V. P.
[1]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Campinas UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil
[2] Univ Londrina UEL, Dept Chem, BR-86057970 Londrina, PR - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of the Brazilian Chemical Society; v. 25, n. 4, p. 716-725, APR 2014. |
| Citações Web of Science: | 2 |
| Resumo | |
This study describes the structural, porosity and morphological changes of porous polymer-derived ceramics obtained by pyrolysis of polysiloxane-clay composites, containing a pore former based on poly(dimethylsiloxane) and nickel acetate as nanostructure inductor. The composites were blended in a steel mold, thermally treated at 950 °C and 1500 °C (inert atmosphere). The increase of the temperature together with the presence of Ni resulted in more crystalline and porous ceramics and a higher ordering process of Cfree phase in the Ni-containing sample. The ceramics revealed a wide pore size distribution, from micro to macropores. At 950 °C the ceramic revealed the presence of pores and Ni- and C-rich islands dispersed on the fracture surface. However, at 1500 °C, nanowires with large aspect ratio, constituted by Si, C and O elements were generated. Thus, the presence of Ni associated to higher pores amount gave rise to an appropriate environment for the nucleation and growth of SiCO nanowires. (AU) | |
| Processo FAPESP: | 03/09926-1 - Materiais poliméricos e cerâmicos |
| Beneficiário: | Inez Valeria Pagotto Yoshida |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa PRONEX - Temático |
| Processo FAPESP: | 05/58460-0 - Estudos em vidros ceramicos de sicxoy ou sic, enriquecidos com fase dispersa de carbono, obtidos a partir de polimero precursor hibrido. |
| Beneficiário: | Mariana Gava Segatelli |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |