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Interfacial forces in nanocellulose based composite materials

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Österberg, Monika, Prof., Aalto University, Department of Forest Products Technology, Finland
dc.contributor.author Olszewska, Anna Maria
dc.date.accessioned 2013-10-15T09:00:28Z
dc.date.available 2013-10-15T09:00:28Z
dc.date.issued 2013
dc.identifier.isbn 978-952-60-5353-0 (electronic)
dc.identifier.isbn 978-952-60-5352-3 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/11116
dc.description.abstract In this work, fundamental interactions in nanocellulose systems and their utility in fabricating novel and advanced cellulose-based materials was studied. More specifically two major aims were investigated. The first concentrates on cationic NFC and its morphology, its fundamental behavior with relation to charge and solvent, and its interactions with other nanocellulose particles. In the second, the approach focuses on the interfacial interactionbetween NFC and polymers (polysaccharides) to assess the importance of their mutual interplay on the mechanical performance of the nanocomposite films. Atomic force microscopy(AFM) in different imaging conditions (liquid and air, and different force detection modes) and the quartz crystal microbalance with dissipation (QCM-D), and tensile tests were combined to carry out this research. The dimensions of cationic (cat) NFC were determined through AFM imaging. Individual nanofribils were found to be smaller in liquid than in air, which pointed at the importance of characterizing nanocellulosic material in situ, before drying. The influence of electrolyte concentration and pH on the swelling of cat NFC films was studied using the QCM-Dtechnique. Cationically modified fibrils were amphoteric in nature; therefore, the swelling of the film was associated with pH conditions. Films with higher water content were observed at lower pH. Cationic NFC incorporated with anionic CNCs was also examined in terms of layerbuild-up. The significance of a dense and well-constructed first layer for successful multilayers formation was shown. Layer-by-layer (LbL) films were further measured by applying thecolloidal probe AFM technique which pointed to the importance of charge and the interpenetration of the layers in the behavior of the films. Interfacial forces between NFC and the polysaccharide or polymer were studied by applying colloidal probe AFM and QCM-D. The importance of the aqueous lubrication of CMC-g-PEG between the NFC segments for the stability and film formation were assessed by studying lateral responces between the interacting particles. The adsorption of CMC-g-PEG markedly increased stability, repulsions and the lubrication in liquid. The reduction of the friction coefficient compared to the bare NFC film was observed both in liquid and in air. This lubricating effect was evaluated in termsof the mechanical properties of films composed of NFC/CMC-g-PEG. An NFC based nanocomposite with a high fraction of reinforcement was prepared by ionic complexation of anionically charged NFC and cationic block copolymers micelles. This prevented macroscopic phase separation and gave rise to composites with an alternating nanoscale hard/softarchitecture. Due to the nanoscopic control over fracture, energy dissipation a significantly larger strain and toughness was achieved. en
dc.format.extent 183
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 151/2013
dc.relation.haspart [Publication 1]: Olszewska A., Eronen P., Johansson L-S., Malho J-M., Ankerfors M., Lindstöm T.; Ruokolainen J.; Laine J., Österberg M. (2011) The behaviour of cationic NanoFibrillar Cellulose in aqueous media. Cellulose, 18, 1213-1226.
dc.relation.haspart [Publication 2]: Olszewska A., Kontturi E., Laine J., Österberg M. (2013) All-cellulose multilayers: long nanofirbils assembled with short nanocrystals. Cellulose, 20, 1777-1789.
dc.relation.haspart [Publication 3]: Wang M., Olszewska A., Walther A., Malho J-M., Schacher F. H., Ruokolainen J., Ankerfors M., Laine J., Berglund L. A., Österberg M., Ikkala O. (2011) Colloidal Ionic Assembly between Anionic Natvie Cellulose Nanofibrils and Cationic Bloc Copolymer Micelles into Biomimetic Naoncomposites. Biomacromolecules, 12, 2074-2081.
dc.relation.haspart [Publication 4]: Olszewska A., Junka K., Nordgren N., Laine J., Rutland M., Österberg M. (2013) Non-ionic assembly of nanofibrillated cellulose and polyethylene grafted carboxymethylcellulose and the effect of aqueous lubrication in polysaccharide-based nanocomposite formation. Soft Matter, 9, 7448-7457.
dc.relation.haspart [Publication 5]: Olszewska A., Valle Delgado J.J., Nikinmaa M., Laine J. Österberg M. (2013) Direct measurements of non-ionic attraction and nanoscaled lubrication in biomimetic composites from nanofibrillated cellulose and modified carboxymethylated cellulose (accepted Nanoscale DOI: 10.1039/C3NR03091A)
dc.subject.other Paper technology en
dc.title Interfacial forces in nanocellulose based composite materials en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.contributor.school School of Chemical Technology en
dc.contributor.department Puunjalostustekniikan laitos fi
dc.contributor.department Department of Forest Products Technology en
dc.subject.keyword nanocellulose en
dc.subject.keyword surface force en
dc.subject.keyword biocomposites en
dc.subject.keyword AFM en
dc.identifier.urn URN:ISBN:978-952-60-5353-0
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Laine, Janne, Prof., Aalto University, Department of Forest Products Technology, Finland
dc.opn Gray, Derek, Professor Emeritus, McGill University, Canada
dc.date.dateaccepted 2013-08-20
dc.rev Oksman, Kristiina, Professor, Luleå University of Technology, Luleå Sweden
dc.rev Peltonen, Jouko, Professor, Åbo Akademi, Turku, Finland
dc.date.defence 2013-10-18
local.aalto.digifolder Aalto_66478
local.aalto.digiauth ask

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