Cellulose aerogel fibers and monoliths with various cellulose
contents after supercritical drying are shown in Fig. 3. The shrinkage
is calculated by volume change of wet gels before and after SCD
drying and the shrinkage was found to be below 15%. The materials
are white and opaque. In contrast to silica aerogels and other
particulate aerogels [2] no visible dust particles are released on
touching these materials and they are not fragile. They give the
tactile impression of a dry soft sponge.