Publications in Scientific Journals:
F. Liebner, E. Haimer, M. Wendland, M.-A. Néouze, K. Schlufter, P. Miethe, T. Heinze, A Potthast, T. Rosenau:
"Aerogels from Unaltered Bacterial Cellulose: Application of scCO2 Drying for the Preparation of Shaped, Ultra-Lightweight Cellulosic Aerogels";
Macromolecular Bioscience,
10
(2010),
4;
349
- 352.
English abstract:
Bacterial cellulose produced by the gram-negative bacterium Gluconacetobacter xylinum was found to be an excellent native starting material for preparing shaped ultra light-weight cellulose aerogels. The procedure comprises thorough washing and sterilization of the aquogel, quantitative solvent exchange and subsequent drying with supercritical carbon dioxide at 40°C and 100bar.
The average density of the obtained dry cellulose aerogels is only about 8 mg cm-3 which is comparable to the most light-weight silica aerogels and distinctly lower than all values published so far for cellulosic aerogels. SEM, ESEM, nitrogen adsorption experiments at 77K, and thermoporosimetry reveal an open-porous network structure that consists of a comparetively high percentage of large mesopores and smaller macropores.
Keywords:
aerogels . bacterial cellulose . biopolymers . porosity . renewable resources . ultra-lightweight materials
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1002/mabi.200900371
Created from the Publication Database of the Vienna University of Technology.