[Zurück]

F. Liebner, N. Aigner, A. Russler, E. Haimer, M. Wendland, K. Schlufter, M.-A. Néouze, J. Nedelec, A. Potthast, T. Rosenau:
"Reinforcement of bacterial cellulose aerogels and loading with bioactive compounds";
Vortrag: 241st ACS National Meeting, Anaheim, CA, United States; 27.03.2011 - 31.03.2011; in: "241st ACS National Meeting & Exposition", (2011), S. CELL-164.

Ultra-lightweight bacterial cellulose (BC) aerogels can be obtained by a facile procedure comprising purifying of the harvested cellulose aquogel, thorough solvent exchange and subsequent scCO₂ drying of the respective lyogels. However, the low apparent densities of BC aerogels and the poor mechanical stability are limiting factors for a broader utilization.
In the current paper we report on recent attempts to re-inforce BC aerogels mainly by introducing a second, interpenetrating network aiming at a far reaching preservation of the highly porous aerogel network structure. Solid glass, functionalized) silicates, polylactic acid, and cellulose acetate are some of the tested interpenetrating compounds. Crosslinking with bifunctional compounds such as terephthalic acid is another approach increasing the stiffness of BC aerogels.
ScCO₂-dried BC aerogels are quantitatively re-wettable and are thus considered to be promising matrixes for slow-release applications. This was confirmed by studying the loading and release of the bioactive compounds D-Panthenol and L-ascorbic acid.