| Full text | |
| Author(s): |
Segatelli, Mariana Gava
[1]
;
Radovanovic, Eduardo
[2]
;
Goncalves, Maria do Carmo
[1]
;
Pagotto Yoshida, Inez Valeria
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
[2] Univ Maringa, Dept Chem, BR-87020900 Maringa, Parana - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Journal of the European Ceramic Society; v. 29, n. 15, p. 3277-3285, DEC 1 2009. |
| Web of Science Citations: | 11 |
| Abstract | |
This study focuses on the structural and morphological changes promoted by heating of silicon oxycarbide ceramics obtained from hybrid polymeric precursors based on poly(methylsiloxane) and divinylbenzene, with or without nickel acetate, by pyrolysis under Ar at different temperatures. The increase of the temperature from 950 to 1500 degrees C promoted the densification and crystallization of SiC and graphite nanodomains in the ceramic bulk with or without Ni, as identified by HRTEM. Moreover, the Ni-containing precursor led to the formation of ultra-long amorphous nanowires on the surface and voids in the ceramic body obtained at 1500 degrees C. These nanowires presented different sizes and morphologies, but similar compositions, basically composed by silicon and oxygen, with the presence of carbon at their external layers. The growth mechanism and the nature of the nanowires are also proposed. The addition of nickel acetate in the polymeric precursor induced the formation of nanowires with different morphologies in the Si-O-C system. (C) 2009 Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 03/09926-1 - Polymeric and ceramic materials |
| Grantee: | Inez Valeria Pagotto Yoshida |
| Support Opportunities: | PRONEX Research - Thematic Grants |