New tannin–lignin aerogels

Highly porous organic aerogels based on tannin and lignin have been prepared and characterized for the first time. Hydrogels were first described, which were prepared at constant solid weight fraction and constant pH, but with different tannin/lignin and (tannin + lignin)/formaldehyde weight ratios. A phase diagram has been drawn, showing the range of compositions in which nice hydrogels may be obtained. The porosity of the resultant aerogels,...