NDLI: Regioselective cross-linking of silica aerogels with magnesium silicate ceramics

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Journal of Materials Chemistry A Vol - 1 Issue - 9

Journal of Materials Chemistry A Vol - 1 Issue - 8

Journal of Materials Chemistry A Vol - 1 Issue - 7

Journal of Materials Chemistry A Vol - 1 Issue - 6

Journal of Materials Chemistry A Vol - 1 Issue - 5

Regioselective cross-linking of silica aerogels with magnesium silicate ceramics

Content Provider	Royal Society of Chemistry (RSC)
Author	Wingfield, C. Leventis, N. Franzel, L. Bertino, M. F. Mahadik-Khanolkar, S.
Copyright Year	2013
Abstract	Nanoporous monoliths with a typical aerogel core and a mechanically robust exterior ceramic layer were synthesized from silica aerogels cross-linked with polyacrylonitrile (X-PAN aerogels). Following supercritical drying, X-PAN aerogels were wrapped in Mg and heated to 850 °C in inert atmosphere to generate Mg-PAN monoliths. Mg penetrated 2–3 mm inside the monolith, reacted with the silica framework and formed a mechanically strong crust with a hardness of 28 MPa, a reduced Young modulus of 374 MPa and a surface area of 170 m2 g−1. The core of the monoliths maintained chemical and physical characteristics close to those of native silica aerogels with a hardness of 0.81 MPa, a modulus of 7.42 MPa and a surface area of 370 m2 g−1. The cross-linking crust was composed of forsterite (Mg2SiO4), enstatite (MgSiO3), cristobalite and magnesium oxide (MgO). SEM and TEM showed that the Mg silicates bridged between silica aggregates, thus realizing the first known example of ceramic cross-linking of aerogels. Control experiments showed that carbon from PAN was responsible for the crust formation. A thin, mechanically weak crust formed in all other samples and was composed of MgO and Mg2SiO4. EELS showed the presence of disordered, graphite-type carbon in Mg-PAN aerogels and traces of amorphous carbon in all other control samples. The role of PAN was confirmed by using masking techniques, whereas acrylonitrile was photopolymerized in selected regions of aerogel monoliths. The crust formed only in these exposed regions. The role of carbon in crust formation is discussed, as well as potential applications of our technique for the fabrication of anisotropic ceramics.
Starting Page	6021
Ending Page	6029
Page Count	9
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	1
Issue Number	19
Journal	Journal of Materials Chemistry A
DOI	10.1039/c3ta90165c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	EELS Aerogel Silicon dioxide Polyacrylonitrile Supercritical drying Monolith Hardness Forsterite Enstatite Cristobalite Magnesium oxide Transmission electron microscopy Carbon Amorphous carbon Acrylonitrile The Crust Anisotropy
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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