Self-Organized Films from Cellulose I Nanofibrils Using the Layer-by-Layer Technique
2010 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 11, no 4, 872-882 p.Article in journal (Refereed) Published
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 PEU/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, 872-882 p.
quartz-crystal microbalance, dual-polarization interferometry, polyelectrolyte multilayer films, atomic-force microscope, microfibrillated cellulose, silica surfaces, paper strength, cationic, polyelectrolytes, viscoelastic properties, adhesive properties
IdentifiersURN: urn:nbn:se:kth:diva-19390DOI: 10.1021/bm100075eISI: 000276557300006ScopusID: 2-s2.0-77950843535OAI: oai:DiVA.org:kth-19390DiVA: diva2:337437
QC 201005252010-08-052010-08-052011-09-23Bibliographically approved