期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 71, 期 13, 页码 1593-1599出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2011.07.003
关键词
Mechanical properties; Nano composites; Cellulose nanofibers; Freeze drying
资金
- Swedish Center of Biomimetic Fiber Engineering (Biomime)
- Swedish Foundation for Strategic Research
- Wallenberg Wood Science Center (WWSC)
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. (C) 2011 Elsevier Ltd. All rights reserved.
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