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Issue 47, 2014
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Structure characterisation method for ideal and non-ideal twisted plywoods

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Abstract

The twisted plywood architecture, known as the Bouligand structure, is a ubiquitous biological and synthetic fibrous composite structure, analogous to that of cholesteric liquid crystals. Twisted plywoods can show ideal or non-ideal structures and are formed via equilibrium or non-equilibrium liquid crystal self-assembly processes. A key to the structure characterisation of plywood films is the specification of the local and global helix vector h(x) and pitch p(x) of the cholesteric order. Previous extensive work demonstrated that oblique cuts of the plywood give rise to arc-patterns that depend both on the unknown incision angle α and the unknown pitch p(x), thus making the precise 3D cholesteric reconstruction ambiguous. In this paper we present an efficient method based on geometric modelling and new visualization software that determines unambiguously the cholesteric pitch under spatially homogeneous and heterogeneous conditions. The method is applied to films that display two-pitch and spatially non-homogenous structures, as sometimes observed under equilibrium and non-equilibrium self-assembly. The method can be extended to other biological materials such as cornea-like, cylindrical, and various cuticle plywoods.

Graphical abstract: Structure characterisation method for ideal and non-ideal twisted plywoods

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Article information


Submitted
14 Aug 2014
Accepted
01 Oct 2014
First published
01 Oct 2014

Soft Matter, 2014,10, 9446-9453
Article type
Paper
Author version available

Structure characterisation method for ideal and non-ideal twisted plywoods

O. F. Aguilar Gutierrez and A. D. Rey, Soft Matter, 2014, 10, 9446
DOI: 10.1039/C4SM01803F

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