Issue 110, 2016, Issue in Progress

Mesoporous silicon carbide via nanocasting of Ludox® xerogel

Abstract

Porous SiC with uniformly sized 12 nm and 22 nm spherical mesopores was synthesized from nanocomposites of polycarbosilane (PCS) preceramic polymer and xerogels of Ludox® SiO2 nanoparticles as templates. The influence of PCS type (Mw 800 and 2000 Da), PCS : SiO2 ratio, pyrolysis temperature 1200–1400 °C, and addition of Ni complex to the preceramic composite was studied with respect to the SiC porous morphology, crystalline structure and chemical properties. We found that the pore walls of Ni-free por-SiC are composed of relatively large (20 nm) crystallites embedded inside a poorly crystalline SiC/SiC1+x phase. Increasing the pyrolysis temperature resulted in an increase of the large crystallites fraction, as well as of the stability with regard to air oxidation; however, some degradation of the porous morphology was noted too. The presence of Ni (1.5% wt relatively to PCS) noticeably improved the crystallinity of por-SiC prepared at 1200–1300 °C, with no degradation of the porous morphology occurring. On the other hand, higher Ni loadings and temperatures led to the transformation of the porous morphology into aggregates of irregularly packed large crystallites.

Graphical abstract: Mesoporous silicon carbide via nanocasting of Ludox® xerogel

Supplementary files

Article information

Article type
Paper
Submitted
01 Sep 2016
Accepted
07 Nov 2016
First published
15 Nov 2016

RSC Adv., 2016,6, 108828-108839

Mesoporous silicon carbide via nanocasting of Ludox® xerogel

D. Korytko, S. Gryn, S. Alekseev, V. Iablokov, O. Khaynakova, V. Zaitsev, I. Bezverkhyy and N. Kruse, RSC Adv., 2016, 6, 108828 DOI: 10.1039/C6RA21972A

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