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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 (Engelska)Ingår i: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 11, nr 4, s. 872-882Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2010. Vol. 11, nr 4, s. 872-882
Nationell ämneskategori
Nanoteknik
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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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Tillgänglig från: 2017-05-15 Skapad: 2017-05-15 Senast uppdaterad: 2023-06-08Bibliografiskt granskad

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