Materials from Nano Fibrillated Cellulose (NFC) have received a lot of attention during the last years. This is both due to their nano-dimensions and properties of the fibrils as well as the fact that they can be extracted from renewable materials. It has also been shown that strong aerogels with tailored surface properties can be prepared by freeze-drying and chemical modification of NFC dispersions (1-3). Since the aerogels are highly porous and since the connectivity of their porous system can be controlled by the preparation conditions these microporous, nanofibrillar systems would be ideal as scaffolds for the preparation of materials for example for controlled release by using, for example, the polyelectrolyte Layer-by-Layer (LbL) technology. A prerequisite for this is that the aerogels can be made wet resilient. In the present work it has, for the first time, been shown that the aerogels can be made wet resilient by a non-complicated covalent crosslinking. With this technique the charge of the aerogel is also increased which allows for a simple LbL modification procedure of their interior properties. It has been shown that the interior of the wet-resilient aerogels can be modified with the LbL technology and that both their mechanical as liquid holding capacity can be controlled.ReferencesP��kk�,M., Vapaavuori, J., Silvennoinen,R., Kosonen, H., Ankerfors, M., T. Lindstr�m,T., Berglund,L.A. and Ikkala,O., Soft Matter, 2008, 4, 2492-2499.Aulin, C.,Netrval, J., W�gberg, L. and Lindstr�m, T., Soft Matter, 2010, 6, 3298-3305.Tchang. Cervin,N., Aulin, C., Larsson, P.T. and W�gberg, L., Cellulose, 2012, 19, 401-410.

Wet-resilient, low density aerogels from nanofibrillated cellulose: Their properties and use as templates for layer-by-layer modification

245th National Meeting (2013)

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