Journal
MACROMOLECULAR BIOSCIENCE
Volume 10, Issue 4, Pages 349-352Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mabi.200900371
Keywords
aerogels; bacterial cellulose; biopolymers; porosity; renewable resources; ultra-lightweight materials
Funding
- Austrian Christian Doppler Research Society through the Christian Doppler Laboratory
- Austrian ministry BMLFUW
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Bacterial cellulose produced by the gram-negative bacterium Gluconacetobacter xylinum was found to be an excellent native starting material for preparing shaped ultra-lightweight cellulose aerogels. The procedure comprises thorough washing and sterilization of the aquogel, quantitative solvent exchange and subsequent drying with supercritical carbon dioxide at 40 degrees C and 100 bar. The average density of the obtained dry cellulose aerogels is only about 8 mg.cm(-3) which is comparable to the most lightweight silica aerogels and distinctly lower than all values for cellulosic aerogels obtained from plant cellulose so far. SEM, ESEM and nitrogen adsorption experiments at 77 K reveal an open-porous network structure that consists of a comparatively high percentage of large mesopores and smaller macropores.
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