Aerogels from nanofibrillated cellulose with tunable oleophobicity
2010 (English)In: SOFT MATTER, ISSN 1744-683X, Vol. 6, no 14, 3298-3305 p.Article in journal (Refereed) Published
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 (theta* >> 90 degrees) for castor oil (gamma(1v) = 35.8 mN m(-1)) and hexadecane (gamma(1v) = 27.5 mN m(-1)).
Place, publisher, year, edition, pages
2010. Vol. 6, no 14, 3298-3305 p.
COHERENT EXPANDED AEROGELS, NEUTRON FIBER DIFFRACTION, HYDROGEN-BONDING SYSTEM, SUPER-WATER-REPELLENT, SYNCHROTRON X-RAY, ORGANIC AEROGELS, MICROFIBRILLATED CELLULOSE, NATIVE CELLULOSE, SUPERHYDROPHOBIC SURFACE, HYDROPHOBIC SURFACES
IdentifiersURN: urn:nbn:se:kth:diva-29502DOI: 10.1039/c001939aISI: 000279566800026ScopusID: 2-s2.0-77954584209OAI: oai:DiVA.org:kth-29502DiVA: diva2:394562
QC 201102032011-02-032011-02-022011-02-03Bibliographically approved