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Investigation of the formation, structure and release characteristics of self-assembled composite films of cellulose nanofibrils and temperature responsive microgels
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.ORCID iD: 0000-0001-8622-0386
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2011 (English)In: Soft Matter, ISSN 1744-683X, Vol. 7, no 4, 1369-1377 p.Article in journal (Refereed) Published
Abstract [en]

The possibility of forming self-organized films using charge-stabilized dispersions of cellulose I nanofibrils and microgel beads of poly-(N-isopropylacrylamide-co-acrylic acid) copolymer is presented. The build-up behavior and the properties of the layer-by-layer (LbL)-constructed films were studied using quartz crystal microbalance with dissipation (QCM-D) and ellipsometry. The morphology of the formed films was also characterized using atomic force microscopy (AFM) imaging. The applied methods clearly demonstrated the successful LbL-assembly of the monodisperse microgels and nanofibrils. The in situ QCM-D measurements also revealed that contrary to the polyelectrolyte bound microgel particles, the nanofibrils-bound gel beads preserve their highly swollen state and do not suffer a partial collapse due to the lack of interdigitation of the oppositely charged components. To probe the accessibility of the gel beads in the formed films, the room temperature (similar to 25 degrees C) loading and release of a fluorescent dye (FITC) was also investigated. The incorporation of the cellulose nanofibrils into the multilayer resulted in an open structure that was found easily penetrable for the dye molecules even at constant room temperature, which is in sharp contrast with previously reported systems based on synthetic polyelectrolytes. The amount of dye released from the multilayer films could be fine-tuned with the number of bilayers. Finally, the thermoresponsivity of the films was also shown by triggering the burst release of the loaded dye when the film was collapsed.

Place, publisher, year, edition, pages
2011. Vol. 7, no 4, 1369-1377 p.
Keyword [en]
QUARTZ-CRYSTAL MICROBALANCE, THIN-FILMS, POLYELECTROLYTE MULTILAYERS, MICROFIBRILLATED CELLULOSE, THERMORESPONSIVE MICROGELS, PHASE-TRANSITION, COMBINED AFM, SURFACE, PARTICLES, ELLIPSOMETRY
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-31299DOI: 10.1039/c0sm00610fISI: 000287091600017Scopus ID: 2-s2.0-79951470592OAI: oai:DiVA.org:kth-31299DiVA: diva2:405168
Funder
EU, FP7, Seventh Framework Programme, PERG02-GA-2007-2249Swedish Research Council
Note
QC 20110321Available from: 2011-03-21 Created: 2011-03-14 Last updated: 2012-08-21Bibliographically approved

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Wågberg, Lars

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