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Wood Research and Technology

Holzforschung

Cellulose – Hemicelluloses – Lignin – Wood Extractives

Editor-in-Chief: Faix, Oskar / Salmén, Lennart

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Volume 62, Issue 2

Issues

Cellulose aerogels: Highly porous, ultra-lightweight materials

Falk Liebner
  • 1Department of Chemistry, University of Natural Resources and Applied Life Sciences, Vienna, Austria
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/ Antje Potthast
  • 2Department of Chemistry, University of Natural Resources and Applied Life Sciences, Vienna, Austria
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/ Thomas Rosenau
  • 3Department of Chemistry, University of Natural Resources and Applied Life Sciences, Vienna, Austria
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/ Emmerich Haimer
  • 4Institute of Chemical and Energy Engineering, University of Natural Resources and Applied Life Sciences, Vienna, Austria
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/ Martin Wendland
  • 5Institute of Chemical and Energy Engineering, University of Natural Resources and Applied Life Sciences, Vienna, Austria
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Published Online: 2008-02-04 | DOI: https://doi.org/10.1515/HF.2008.051

Abstract

Cellulosic 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 (NMMO) 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 material having densities down to 0.05 g cm-3 and surface areas of up to 280 m2 g-1. In this study, several aspects of cellulosic aerogel production are communicated: the stabilization of the cellulose solutions against degradation reactions by agents suitable for later extraction and drying, a reliable extraction and drying procedure by supercritical carbon dioxide, the advantages of DMSO/NMMO in this procedure as a solvent/non-solvent pair, and some data on the physical properties of the materials.

Keywords: aerogels; carbon dioxide (supercritical); cellulose; Lyocell; N-methylmorpholine-N-oxide (NMMO); regeneration; stabilization; supercritical drying

About the article

Corresponding author. Department of Chemistry, University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190 Vienna, Austria


Received: 2007-08-13

Accepted: 2007-11-22

Published Online: 2008-02-04

Published in Print: 2008-03-01


Citation Information: Holzforschung, Volume 62, Issue 2, Pages 129–135, ISSN (Online) 1437434X, ISSN (Print) 00183830, DOI: https://doi.org/10.1515/HF.2008.051.

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