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Addition of silica nanoparticles to tailor the mechanical properties of nanofibrillated cellulose thin films
Royal Institute Technology KTH.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tillämpad optik. Linköpings universitet, Tekniska högskolan.ORCID-id: 0000-0001-9229-2028
Innventia AB.
Royal Institute Technology KTH.
2011 (Engelska)Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 363, nr 2, s. 566-572Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Over the last decade, the use of nanocellulose in advanced technological applications has been promoted both due the excellent properties of this material in combination with its renewability. In this study, multilayered thin films composed of nanofibrillated cellulose (NFC), polyvinyl amine (PVAm) and silica nanoparticles were fabricated on polydimethylsiloxane (PDMS) using a layer-by-layer adsorption technique. The multilayer build-up was followed in situ by quartz crystal microbalance with dissipation, which indicated that the PVAm-SiO(2)-PVAm-NFC system adsorbs twice as much wet mass material compared to the PVAm-NFC system for the same number of bilayers. This is accompanied with a higher viscoelasticity for the PVAm-SiO(2)-PVAm-NFC system. Ellipsometry indicated a dry-state thickness of 2.2 and 3.4 nm per bilayer for the PVAm-NFC system and the PVAm-SiO(2)-PVAm-NFC system, respectively. Atomic force microscopy height images indicate that in both systems, a porous network structure is achieved. Youngs modulus of these thin films was determined by the Strain-Induced Elastic Buckling Instability for Mechanical Measurements (SIEBIMM) technique. The Youngs modulus of the PVAm/NFC films was doubled, from 1 to 2 GPa, upon incorporation of silica nanoparticles in the films. The introduction of the silica nanoparticles lowered the refractive index of the films, most probably due to an increased porosity of the films.

Ort, förlag, år, upplaga, sidor
Elsevier , 2011. Vol. 363, nr 2, s. 566-572
Nyckelord [en]
Buckling, Cellulose, Light transmission, Porous, Strain, Thin film
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:liu:diva-71372DOI: 10.1016/j.jcis.2011.07.085ISI: 000295192900018OAI: oai:DiVA.org:liu-71372DiVA, id: diva2:448077
Tillgänglig från: 2011-10-14 Skapad: 2011-10-14 Senast uppdaterad: 2017-12-08

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