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Erschienen in: Journal of Sol-Gel Science and Technology 2/2020

11.02.2020 | Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)

Facile fabrication of Fe-doped Si–C–N ceramic microspheres with flower-like morphology and the infrared extinction property

verfasst von: Jing Li, Hongli Liu, Yiting Zhang, Yajing Li, Dongli Qi, Zhong Chen

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 2/2020

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Abstract

Nonoxide ceramics microspheres with multiple compositions are attractive for wide applications especially in thermal insulation science. The flower-like Fe-doped Si–C–N ceramic microspheres with the average size of about 1 μm were fabricated from polyvinylsilazane and ferrocene precursor through polymer-derived ceramics technology combined with emulsion polymerization method. The properties of the resultant microspheres were characterized by FTIR, SEM-EDX, VSM, TGA, and XRD. The morphology and size of the microspheres could be tuned by changing of ferrocene content, cross-linking time, and pyrolysis temperature. The ceramic microspheres were estimated to be composed of SiC/Si3N4 and α-Fe/Fe2O3 crystal phase, and the folding sheets on the surface induced the flower-like morphology due to phase separation and crystal rearrangement. The effective extinction coefficient of silica aerogels opacified with 10 wt% of Fe-doped Si–C–N microspheres increased with rising pyrolysis temperature, the maximum value of e* reached 27.5 cm2/g at 1300 °C. Moreover, the microspheres showed weak room temperatures ferromagnetism, which was facilitated to alignment in fabrication and recycle, make them an ideal candidate for aerogels in infrared shielding application.

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Metadaten
Titel
Facile fabrication of Fe-doped Si–C–N ceramic microspheres with flower-like morphology and the infrared extinction property
verfasst von
Jing Li
Hongli Liu
Yiting Zhang
Yajing Li
Dongli Qi
Zhong Chen
Publikationsdatum
11.02.2020
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 2/2020
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-020-05250-x

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