Journal of the Brazilian Chemical Society | |
Porous ceramic materials from polysiloxane-clay composites | |
Silva, Viviane P.1  Yoshida, Inez V. P.1  Segatelli, Mariana G.1  Kaneko, Manuela L. Q. A.1  University of Campinas, Campinas, Brazil1  University of Londrina, Londrina, Brazil1  | |
关键词: polysiloxane; ceramic matrix composites; clay; pyrolysis.; | |
DOI : 10.5935/0103-5053.20140025 | |
学科分类:化学(综合) | |
来源: SciELO | |
【 摘 要 】
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.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
RO201912050582163ZK.pdf | 1285KB | download |