| Autor: |
Fortuniak, W., Chojnowski, J., Mizerska, U., Pospiech, P., Zakrzewska, J., Slomkowski, S. |
| Předmět: |
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| Zdroj: |
Journal of Inorganic & Organometallic Polymers & Materials; Sep2020, Vol. 30 Issue 9, p3574-3585, 12p |
| Abstrakt: |
A simple method of synthesis for the macroporous SiOC spheroidal microparticles was developed. Preceramic polysiloxane macroporous microbeads were obtained by a one-step aqueous emulsion process involving poly(hydromethylsiloxane) (PHMS) with the addition of FeCl3·6H2O. Thermal treatment of these particles gave various SiOC materials depending on the pyrolysis temperature. Hierarchically porous spheroidal mezo-macroporous ceramers were obtained at 600 °C. Heating at 850–1000 °C gave SiOC ceramic spheroidal particles with about 60% open porosity. Ceramization at 1200–1400 °C led to the particles decorated with ceramic whiskers and wires. Heating at 1600 °C gave wires and spilled ceramic particles. These 1D ceramic structures were formed by a Vapor–Liquid–Solid (VLS) mechanism. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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