Hydrodynamic alignment and assembly of nanofibrils resulting in strong cellulose filaments

Karl M. O. Håkansson, Andreas B. Fall, Fredrik Lundell (), Shun Yu, Christina Krywka, Stephan V. Roth, Gonzalo Santoro, Mathias Kvick, Lisa Prahl Wittberg, Lars Wågberg and L. Daniel Söderberg
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Karl M. O. Håkansson: Wallenberg Wood Science Center, KTH Royal Institute of Technology
Andreas B. Fall: Wallenberg Wood Science Center, KTH Royal Institute of Technology
Fredrik Lundell: Wallenberg Wood Science Center, KTH Royal Institute of Technology
Shun Yu: Photon Science, DESY
Christina Krywka: Ruprecht Haensel Laboratory, University of Kiel
Stephan V. Roth: Photon Science, DESY
Gonzalo Santoro: Photon Science, DESY
Mathias Kvick: Wallenberg Wood Science Center, KTH Royal Institute of Technology
Lisa Prahl Wittberg: Wallenberg Wood Science Center, KTH Royal Institute of Technology
Lars Wågberg: Wallenberg Wood Science Center, KTH Royal Institute of Technology
L. Daniel Söderberg: Wallenberg Wood Science Center, KTH Royal Institute of Technology

Nature Communications, 2014, vol. 5, issue 1, 1-10

Abstract: Abstract Cellulose nanofibrils can be obtained from trees and have considerable potential as a building block for biobased materials. In order to achieve good properties of these materials, the nanostructure must be controlled. Here we present a process combining hydrodynamic alignment with a dispersion–gel transition that produces homogeneous and smooth filaments from a low-concentration dispersion of cellulose nanofibrils in water. The preferential fibril orientation along the filament direction can be controlled by the process parameters. The specific ultimate strength is considerably higher than previously reported filaments made of cellulose nanofibrils. The strength is even in line with the strongest cellulose pulp fibres extracted from wood with the same degree of fibril alignment. Successful nanoscale alignment before gelation demands a proper separation of the timescales involved. Somewhat surprisingly, the device must not be too small if this is to be achieved.

Date: 2014
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DOI: 10.1038/ncomms5018

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