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Issue 14, 2010
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Aerogels from nanofibrillated cellulose with tunable oleophobicity

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Abstract

The formation of structured porous aerogels of nanofibrillated cellulose (NFC) by freeze-drying has been demonstrated. The aerogels have a high porosity, as shown by FE-SEM and nitrogen adsorption/desorption measurements, and a very low density (<0.03 g cm−3). The density and surface texture of the aerogels can be tuned by selecting the concentration of the NFC dispersions before freeze-drying. Chemical vapor deposition (CVD) of 1H,1H,2H,2H-perfluorodecyltrichlorosilane (PFOTS) was used to uniformly coat the aerogel to tune their wetting properties towards non-polar liquids. An XPS analysis of the chemical composition of the PFOTS-modified aerogels demonstrated the reproducibility of the PFOTS-coating and the high atomic fluorine concentration (ca. 51%) in the surfaces. The modified aerogels formed a robust composite interface with high apparent contact angles (θ* ≫ 90°) for castor oil (γlv = 35.8 mN m−1) and hexadecane (γlv = 27.5 mN m−1).

Graphical abstract: Aerogels from nanofibrillated cellulose with tunable oleophobicity

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Publication details

The article was received on 28 Jan 2010, accepted on 19 Apr 2010 and first published on 14 May 2010


Article type: Paper
DOI: 10.1039/C001939A
Citation: Soft Matter, 2010,6, 3298-3305
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    Aerogels from nanofibrillated cellulose with tunable oleophobicity

    C. Aulin, J. Netrval, L. Wågberg and T. Lindström, Soft Matter, 2010, 6, 3298
    DOI: 10.1039/C001939A

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