High-porosity aerogels of high specific surface area prepared from nanofibrillated cellulose (NFC)
2011 (English)In: Composites Science And Technology, ISSN 0266-3538, Vol. 71, no 13, 1593-1599 p.Article in journal (Refereed) Published
Low-density aerogels based on nanofibrillated cellulose (NFC) from wood pulp were prepared from NFC aqueous dispersions using solvent exchange from water to tert-butanol followed by tert-butanol freeze-drying. In the present study, the dispersion of NFC nanofibers in the hydrocolloid was very well preserved in the aerogels. The "effective" diameter of the NFC nanofibers in the aerogels is around 10-18 nm corresponding to specific surface areas as high as 153-284 m(2) g(-1). Aerogels based on different NFC nanofibers were studied by FE-SEM, BET analysis (nitrogen gas adsorption), and mechanical properties were measured in compression for different densities of aerogels. The properties are compared with polymer foams and inorganic aerogels. Compared with cellular NFC foams, the present nanofibrous aerogels have lower modulus and show lower stress in compression for a given strain. Tert-butanol freeze-drying can therefore be used to create "soft" aerogels.
Place, publisher, year, edition, pages
2011. Vol. 71, no 13, 1593-1599 p.
Mechanical properties, Nano composites, Cellulose nanofibers, Freeze drying
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-45601DOI: 10.1016/j.compscitech.2011.07.003ISI: 000295864000010ScopusID: 2-s2.0-80051939439OAI: oai:DiVA.org:kth-45601DiVA: diva2:454466
QC 20111107 This article is a revised version of the manuscript "High-porosity aerogels of high specific surface area prepared by new routeusing nanofibrillated cellulose (NFC) disintegrated from the wood cell wall" which is a part of the thesis "Nanofiber networks, aerogels and biocomposites based on nanofibrillated cellulose from wood"2011-11-072011-10-312011-11-11Bibliographically approved