Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1458829 | Ceramics International | 2016 | 5 Pages |
Abstract
Silicon oxycarbide (SiOC) aerogels have been synthesized from preceramic polymers via pyrolysis in inert atmosphere at 1200 and 1300 °C. The as synthesized materials have a typical colloidal microstructure with mesoporosity in the range 10–50 nm and no microporosity. HF acid attack of the SiOC aerogels dissolves preferentially the SiO2-rich phase and creates micro-and (small)mesopores (<10 nm) in the aerogels microstructure finally leading to a materials with hierarchical porosity. The HF post-pyrolysis treatment is more efficient for the SiOC aerogels pyrolyzed at the maximum temperature, i.e. 1300 °C, leading to a maximum value of specific surface area of 530 m2/g and total porosity of 0.649 cc/g.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Dawit Assefa, Emanuele Zera, Renzo Campostrini, Gian Domenico Soraru, Cekdar Vakifahmetoglu,