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Synthesis of La9.33Si6O26 Pore–Solid Nanoarchitectures via Epoxide-Driven Sol–Gel Chemistry

Célérier, Stéphane and Laberty-Robert, Christel and Long, Jeffrey W. and Pettigrew, Katherine A. and Stroud, Rhonda M. and Rolison, Debra R. and Ansart, Florence and Stevens, Philippe Synthesis of La9.33Si6O26 Pore–Solid Nanoarchitectures via Epoxide-Driven Sol–Gel Chemistry. (2006) Advanced Materials, vol. 18 (n° 5). pp. 615-618. ISSN 0935-9648

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Official URL: http://dx.doi.org/10.1002/adma.200501938

Abstract

Silicate-based oxides are of interest as electrolytes and electrode materials in intermediate-temperature solid-oxide fuel cells (SOFCs).[1–7] We have developed a sol–gel-based strategy for the production of mesoporous, nanostructured, singlephase La9.33Si6O26 apatite in an aerogel-type framework. Silicon alkoxides react with lanthanum(III) aqueous ions in alcohol solutions driven by a proton-scavenging agent, propylene oxide. Varying the means by which pore fluid is removed from the resultant lanthanum silicate gels yields three distinct pore–solid monolithic nanoarchitectures: aerogels, ambigels, and xerogels. The ambigel and aerogel nanoarchitectures exhibit high specific surface areas (from 285 to 408 m2 g–1), aperiodic through-connected networks of mesopores, and covalently bonded networks of non-agglomerated nanoparticles. Calcination at relatively mild temperatures for this oxide (800 °C) converts the amorphous gels to nanocrystalline apatite La9.33Si6O26. Although densified during calcination, the aerogel and ambigel nanoarchitectures retain porosity, high surface area, and limited particle agglomeration.

Item Type:Article
Additional Information:Thanks to John Wiley & Sons editor. The definitive version is available at http://www3.interscience.wiley.com The original PDF of the article can be found at Advanced Materials website :http://www3.interscience.wiley.com/journal/10008336/home
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > United States Navy - USNavy (USA)
Other partners > EDF (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Celine Cabaup

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