MODIFICATION OF BACTERIAL CELLULOSE AEROGELS
Aerogels from bacterial cellulose (BCAG) are fascinating ultra-lightweight structures,exhibiting a hierarchical three-dimensional porous morphology made of pure cellulose combined with extraordinarily high surface area and toughness.Nevertheless,pure cellulose may not be suitable for all applications.To open up new fields of possible usages,the cellulose aerogel has to be modified.Due to the fragile nature,a combination of special techniques based on supercritical CO2 has to be applied for appropriate drying,derivatization,and surface coating. Due to its intrinsic viscosity and dissolution properties,supercritical CO2 can be used as multifunctional medium for processing of (bacterial) cellulose aerogels: drying,chemical reactions,and solvent for impregnation or fixation of substances within the porous material.In combination with,wetchemical techniques,supercritical CO2 allows equipping of bacterial cellulose aerogels with a multitude of substances,and different surface derivatizations are possible.By these modifications the unique structure of bacterial cellulose aerogels can be influenced in a controlled way,for instance to provide higher mechanical stability,to provide chemically active substances,substituents or anchor groups,or to change its hydrophilicity. Different analytical techniques,such as FTIR,SEM,and GPC have been used to confirm a homogeneous modification throughout the three-dimensional structure of the cellulosic aerogel and to monitor the property changes of the modified materials. With bacterial cellulose aerogels - and especially with the new ways to modify them - novel intelligent materials and composites are accessible and thus new application fields open up for these intriguing cellulosic materials.
bacterial cellulose aerogel modification supercritical carbon dioxide
Axel Russler Peter Miethe Falk Liebner Antje Potthast Thomas Rosenau
Christian Doppler Laboratory for Advanced Cellulose Chemistry and Analytics,University of Natural Re FZMB GmbH Forschungszentrum fur Medizintechnik und Biotechnologie,Bad Langensalza,Germany.
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
1262-1266
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）