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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

Amira Barhoumi Meddeb*
Affiliation:
Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pennsylvania16802, United States Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania16802, United States
Inseok Chae
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania16802, United States Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania16802, United States
Federico Scurti
Affiliation:
Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania16802, United States
Justin Schwartz
Affiliation:
Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania16802, United States
Seong H. Kim
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania16802, United States Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania16802, United States
Zoubeida Ounaies
Affiliation:
Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pennsylvania16802, United States Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania16802, United States
*
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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.

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Articles
Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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