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Self-organized films from cellulose i nanofibrils using the layer-by-layer technique
RISE, Innventia.ORCID iD: 0000-0001-7979-9158
2010 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 11, no 4, p. 872-882Article in journal (Refereed) Published
Abstract [en]

The possibility of forming self-organized films using only charge-stabilized dispersions of cellulose I nanofibrils with opposite charges is presented, that is, the multilayers were composed solely of anionically and cationically modified microfibrillated cellulose (MFC) with a low degree of substitution. The build-up behavior and the properties of the layer-by-layer (LbL)-constructed films were studied using a quartz crystal microbalance with dissipation (QCM-D) and stagnation point adsorption reflectometry (SPAR). The adsorption behavior of cationic/anionic MFC was compared with that of polyethyleneimine (PEI)/anionic MFC. The water contents of five bilayers of cationic/anionic MFC and PEI/anionic MFC were approximately 70 and 50%, respectively. The MFC surface coverage was studied by atomic force microscopy (AFM) measurements, which clearly showed a more dense fibrillar structure in the five bilayer PEI/anionic MFC than in the five bilayer cationic/anionic MFC. The forces between the cellulose-based multilayers were examined using the AFM colloidal probe technique. The forces on approach were characterized by a combination of electrostatic and steric repulsion. The wet adhesive forces were very long-range and were characterized by multiple adhesive events. Surfaces covered by PEI/anionic MFC multilayers required more energy to be separated than surfaces covered by cationic/anionic MFC multilayers.

Place, publisher, year, edition, pages
2010. Vol. 11, no 4, p. 872-882
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Nano Technology
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URN: urn:nbn:se:ri:diva-29567DOI: 10.1021/bm100075eScopus ID: 2-s2.0-77950843535OAI: oai:DiVA.org:ri-29567DiVA, id: diva2:1095633
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cited By 59

Available from: 2017-05-15 Created: 2017-05-15 Last updated: 2018-08-22Bibliographically approved

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Lindström, Tom

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