| Full text | |
| Author(s): |
Segatelli, Mariana G.
[1, 2]
;
Kaneko, Manuela L. Q. A.
[1]
;
Silva, Viviane P.
[1]
;
Yoshida, Inez V. P.
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Campinas UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil
[2] Univ Londrina UEL, Dept Chem, BR-86057970 Londrina, PR - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Journal of the Brazilian Chemical Society; v. 25, n. 4, p. 716-725, APR 2014. |
| Web of Science Citations: | 2 |
| Abstract | |
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) | |
| FAPESP's process: | 03/09926-1 - Polymeric and ceramic materials |
| Grantee: | Inez Valeria Pagotto Yoshida |
| Support Opportunities: | PRONEX Research - Thematic Grants |