Online determination of anisotropy during cellulose nanofibril assembly in a flow focusing device
2015 (English)In: RSC Advances, ISSN 2046-2069, Vol. 5, no 24, 18601-18608 p.Article in journal (Refereed) Published
In order to utilize the high strength (ultimate tensile strength = 3 GPa) [Saito et al., Biomacromolecules, 2012, 14, 248] and stiffness (Young's modulus = 130 GPa) [Sakurada et al., J. Polym. Sci., 1962, 57, 651] of cellulose nanofibrils in a macroscopic material or composite, the structure of the elongated fibrils in the material must be controlled. Here, cellulose nanofibrils in a dispersed state are partly aligned in a flow focusing device, whereafter the anisotropic nano-structure is locked by a dispersion-gel transition. The alignment process has been studied by Hakansson et al., [Nat. Commun., 2014, 5, 4018], however, the location of the phase transition as well as at which alignment (anisotropy) the fibrils were locked was not investigated. In this study, the degree of alignment is determined with small angle X-ray scattering experiments and the location of the phase change is measured with polarized light experiments. Furthermore, the anisotropy of the hydrogel thread is determined and the thread is seen to still be anisotropic after six months in a water bath.
Place, publisher, year, edition, pages
2015. Vol. 5, no 24, 18601-18608 p.
Alignment, Aluminum, Cellulose, Dispersions, Elastic moduli, Locks (fasteners), Nanofibers, Nanostructures, Tensile strength, X ray scattering, Biomacromolecules, Cellulose nanofibrils, Degree of alignments, Flow focusing devices, Gel transitions, Macroscopic materials, On-line determination, Ultimate tensile strength
IdentifiersURN: urn:nbn:se:kth:diva-150582DOI: 10.1039/c4ra12285bISI: 000349999200053ScopusID: 2-s2.0-84923239980OAI: oai:DiVA.org:kth-150582DiVA: diva2:744271
FunderKnut and Alice Wallenberg Foundation
QC 20150407. Updated from manuscript to article in journal.2014-09-082014-09-082015-04-07Bibliographically approved