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Shear-stiffening cellulose nanofibre gels with tuneable mechanical characteristics
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation.
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2011 (English)Conference paper, Abstract (Other academic)
Abstract [en]

Gels have been synthesized from the renewable, strong and low cost cellulose nanofibres; nanofibrillated cellulose (NFC). The gels are shown to exhibit pronounced shear-stiffening properties and large extensibility (above 100%). The stiffening is due to strain induced orientation of the nanofibers, which is enabled by the free rotation at the particle-particle joints. The gels are synthesized from low concn. aq. NFC solns. By decreasing the electrostatic double-layer repulsion between the NFC fibrils, aggregation is initiated and a fluid-gel transition occurs. This transition can be detected within a range of vol. fractions. We characterize the gel microstructures using dynamic light scattering and the mech. properties using a rheometer. The mech. properties of these gels are tuneable; significantly different properties are seen if gels are formed by reducing pH or by increasing ionic strength. It is also obsd. that the properties of the gels depend on the type of counter-ion. [on SciFinder(R)]

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2011. Vol. 241
, Abstracts of papers of the american chemical society, ISSN 0065-7727
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-100768ISI: 000291982802541OAI: diva2:544968
241st ACS National Meeting & Exposition, Anaheim, CA, United States, March 27-31, 2011

QC 20120919

Available from: 2012-08-17 Created: 2012-08-16 Last updated: 2016-04-28Bibliographically approved

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Fall, AndreasLindström, Stefan B.Wågberg, Lars
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