Role of polysiloxanes in the synthesis of aligned porous silicon oxycarbide ceramics
| Autor: | Ravindran Sujith, R. Parameshwaran, Pawan K. Chauhan, Siva Prasad Avs |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Polymethylhydrosiloxane Materials science Hydrotalcite Process Chemistry and Technology Thermal decomposition 02 engineering and technology Polymer 021001 nanoscience & nanotechnology Porous silicon 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Chemical engineering chemistry Specific surface area 0103 physical sciences Materials Chemistry Ceramics and Composites 0210 nano-technology Porous medium Porosity |
| Zdroj: | Ceramics International. 45:8150-8156 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2019.01.116 |
| Popis: | The present work focuses on establishing the role of polysiloxane precursors in the synthesis of aligned porous polymer derived silicon oxycarbide ceramics. The precursors used for the synthesis are, polymethylhydrosiloxane, vinyl terminated polydimethylsiloxane and cyclic tetramethyl-tetravinlycyclotetrasiloxane. Hydrotalcite is used for attaining aligned macroporosity during the crosslinking stage itself. Subsequently, pyrolysis of the sample has been carried out to synthesize the ceramics. The evolution of pore structure in these PDCs during the crosslinking and pyrolysis is co-related to the thermal decomposition behaviour. The pore morphology, structure and the size were analyzed using SEM, X-ray computed tomography and BET. Our studies confirm the presence of bimodal porosity in these PDCs. These PDCs have a specific surface area ranging from 77 to 160 m2/g and a total pore volume ranging from 0.18 to 0.29 cm3/g. These results could be significant for achieving a controlled synthesis process of porous materials suitable for various applications like adsorption, filtering and electrochemical storage. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect