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Silica, carbon and boron nitride monoliths with hierarchical porosity prepared by spark plasma sintering process

Dibandjo, Philippe and Bois, Laurence and Estournès, Claude and Durand, Bernard and Miele, Philippe Silica, carbon and boron nitride monoliths with hierarchical porosity prepared by spark plasma sintering process. (2008) Microporous and Mesoporous Materials, vol. 111 (n° 1 - 3). pp. 643-648. ISSN 1387-1811

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Official URL: http://dx.doi.org/10.1016/j.micromeso.2007.07.036

Abstract

Silica SBA-15, carbon CMK-3, boron nitride (BN), the latter synthesized from the first two compounds as templates, are mesoporous materials in the form of powders. They have a high specific surface area and an important mesoporous volume. The porosity is organized with the hexagonal symmetric space group p6mm. For selected applications, it could be interesting to preserve these characteristics with materials in a well-defined shape at a macroscopic scale (few millimeters to centimeter). Spark plasma sintering (SPS) is a well-known technique which allows to prepare monoliths with relatively mild conditions. The SPS technique has been used on these mesoporous powders without charge or with a uniaxial charge and at temperatures of 600 °C, 800 °C for silica, 1100 °C, 1300 °C for carbon and 1600 °C, 1700 °C for boron nitride during 1–5 min. The nitrogen adsorption/desorption isotherms reveal that the obtained monoliths present high specific surface area (300–500 m2/g) and important mesoporous volume. The coexistence of interconnected mesoporosity and macroporosity (with volume’s close value) was observed by SEM and TEM, while the XRD and TEM characterization show that the mesoporosity organization is partially preserved.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Microporous and Mesoporous Materials website : http://www.sciencedirect.com./science/journal/13871811
Audience (journal):International peer-reviewed journal
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Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université Claude Bernard-Lyon I - UCBL (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Celine Cabaup
Deposited On:22 Apr 2009 14:22

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