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Aerogels from nanofibrillated cellulose with tunable oleophobicity

Soft matter, 2010-01, Vol.6 (14), p.3298-335 [Peer Reviewed Journal]

ISSN: 1744-683X ;ISSN: 1744-6848 ;EISSN: 1744-6848 ;DOI: 10.1039/c001939a

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  • Title:
    Aerogels from nanofibrillated cellulose with tunable oleophobicity
  • Author: Aulin, Christian ; Netrval, Julia ; Wågberg, Lars ; Lindström, Tom
  • Subjects: Chemistry ; COHERENT EXPANDED AEROGELS ; HYDROGEN-BONDING SYSTEM ; HYDROPHOBIC SURFACES ; Kemi ; MICROFIBRILLATED CELLULOSE ; NATIVE CELLULOSE ; NATURAL SCIENCES ; NATURVETENSKAP ; NEUTRON FIBER DIFFRACTION ; ORGANIC AEROGELS ; SUPER-WATER-REPELLENT ; SUPERHYDROPHOBIC SURFACE ; SYNCHROTRON X-RAY
  • Is Part Of: Soft matter, 2010-01, Vol.6 (14), p.3298-335
  • Description: 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 1 H ,1 H ,2 H ,2 H -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 ( * > 90°) for castor oil ( γ lv = 35.8 mN m −1 ) and hexadecane ( γ lv = 27.5 mN m −1 ). The formation of structured nanofibrillated cellulose aerogels with tunable oleophobicity has been demonstrated. The SEM-image shows the structure for an aerogel frozen at a concentration of 0.7 wt% and the corresponding wetting of the oleophobic aerogel with castor oil.
  • Language: English
  • Identifier: ISSN: 1744-683X
    ISSN: 1744-6848
    EISSN: 1744-6848
    DOI: 10.1039/c001939a
  • Source: Alma/SFX Local Collection
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