Ultralight-Weight Cellulose Aerogels from NBnMO-Stabilized Lyocell Dopes

Liebner, Falk; Potthast, Antje; Rosenau, Thomas; Haimer, Emmerich; Wendland, Martin

doi:https://doi.org/10.1155/2007/73724

Advances in Materials Science and Engineering

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Research Letter | Open Access

Volume 2007 | Article ID 073724 | https://doi.org/10.1155/2007/73724

Ultralight-Weight Cellulose Aerogels from NBnMO-Stabilized Lyocell Dopes

Falk Liebner,¹Antje Potthast,¹Thomas Rosenau,¹Emmerich Haimer,²and Martin Wendland²

Academic Editor: H. Habazaki

Received06 Aug 2007

Accepted05 Oct 2007

Published29 Oct 2007

Abstract

Cellulose aerogels are intriguing new materials produced by supercritical drying of regenerated cellulose obtained by solvent exchange of solid Lyocell moldings. From N-methylmorpholine-N-oxide solutions with cellulose contents between 1 and 12%, dimensionally stable cellulose bodies are produced, in which the solution structure of the cellulose is largely preserved and transferred into the solid state. The specific density and surface of the obtained aerogels range from 0.05 to 0.26 g/cm3 and from 172 to 284 m2/g, respectively, depending on the cellulose content of the Lyocell dopes and regeneration procedure. A reliable extraction and drying procedure using supercritical carbon dioxide, the advantageous use of NBnMO as stabilizer for the Lyocell dopes, and selected physical properties of the materials is communicated.

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Copyright

Copyright © 2007 Falk Liebner et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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