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Investigation of the formation, structure and release characteristics of self-assembled composite films of cellulose nanofibrils and temperature responsive microgels

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Back cover

Soft Matter Vol - 7 Issue - 3

Investigation of the formation, structure and release characteristics of self-assembled composite films of cellulose nanofibrils and temperature responsive microgels

Content Provider	Royal Society of Chemistry (RSC)
Author	Claesson, Per M. Lindström, Tom Aulin, Christian Varga, Imre Acciaro, Roberta Wågberg, Lars
Copyright Year	2011
Abstract	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 situQCM-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 (∼25 °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.
Starting Page	1369
Ending Page	1377
Page Count	9
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	7
Issue Number	4
Journal	Soft Matter
DOI	10.1039/c0sm00610f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Dispersity Polyelectrolyte Dye Quartz crystal microbalance with dissipation monitoring Atomic-force microscopy Cellulose Fluorescein Copolymer Microbalance Ellipsometry
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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