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Beyond buckling: humidity-independent measurement of the mechanical properties of green nanobiocomposite films

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Abstract

Precise knowledge of the mechanical properties of emerging nanomaterials and nanocomposites is crucial to match their performance with suitable applications. While methods to characterize mechanical properties exist, they are limited by instrument sensitivity and sample requirements. For bio-based nanomaterials this challenge is exacerbated by the extreme dependence of mechanical properties on humidity. This work presents an alternative approach, based on polymer shrinking-induced wrinkling mechanics, to determine the elastic modulus of nanobiocomposite films in a humidity-independent manner. Layer-by-layer (LbL) films containing cellulose nanocrystals (CNCs) and water-soluble polymers were deposited onto pre-stressed polystyrene substrates followed by thermal shrinking, which wrinkled the films to give them characteristic topographies. Three deposition parameters were varied during LbL assembly: (1) polymer type (xyloglucan – XG, or polyethyleneimine – PEI); (2) polymer concentration (0.1 or 1 wt%); and (3) number of deposition cycles, resulting in 10–600 nm thick nanobiocomposite films with tuneable compositions. Fast Fourier transform analysis on electron microscopy images of the wrinkled films was used to calculate humidity-independent moduli of 70 ± 2 GPa for CNC-XG0.1, 72 ± 2 GPa for CNC-PEI0.1, and 32.2 ± 0.8 GPa for CNC-PEI1.0 films. This structuring method is straightforward and amenable to a wide range of supported thin films.

Graphical abstract: Beyond buckling: humidity-independent measurement of the mechanical properties of green nanobiocomposite films

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Publication details

The article was received on 11 Jan 2017, accepted on 27 Mar 2017 and first published on 04 Apr 2017


Article type: Paper
DOI: 10.1039/C7NR00251C
Citation: Nanoscale, 2017, Advance Article
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    Beyond buckling: humidity-independent measurement of the mechanical properties of green nanobiocomposite films

    U. Gill, T. Sutherland, S. Himbert, Y. Zhu, M. C. Rheinstädter, E. D. Cranston and J. M. Moran-Mirabal, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR00251C

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