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From a cholesteric non-aqueous cellulose nanocrystal suspension to a highly ordered film
Published online by Cambridge University Press: 06 November 2020
Abstract
A highly ordered cellulose nanocrystal (CNC) film was processed and characterized from a non-aqueous suspension. As a first step, by drawing upon the negative magnetic anisotropy of CNCs, a global order of the nanocrystals is achieved by magnetic field-assisted manipulation of a cholesteric suspension in n-methylformamide (NMF), and then the order is subsequently preserved into a solid-state film. We study the differences between the structures of the 4 T-dried film and the control film dried in the absence of magnetic field. Additionally, we compare the NMF-dried films to those dried from aqueous suspensions with and without magnetic field. Optical microscopy, cross-sectional imaging analysis, and sum frequency generation (SFG) spectroscopy show that the CNC-NMF film dried under magnetic field exhibited a highly ordered layered structure throughout the film, comparable to that observed when films were produced from aqueous suspensions. Extending the potential of the CNC alignment to non-aqueous systems will enable a broad spectrum of applications for CNC-based polymer composites.
- Type
- Articles
- Information
- MRS Advances , Volume 5 , Issue 64: Snapshot reviews in materials advances 2020 , 2020 , pp. 3547 - 3554
- Copyright
- Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press
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