Biomimetic design of iridescent insect cuticles with tailored, self-organized cholesteric patterns.

Abstract:

:Replicating biological patterns is promising for designing materials with multifaceted properties. Twisted cholesteric liquid crystal patterns are found in the iridescent tessellated cuticles of many insects and a few fruits. Their accurate replication is extremely difficult since discontinuous patterns and colors must coexist in a single layer without discontinuity of the structures. Here, a solution is demonstrated by addressing striped insect cuticles with a complex twisted organization. Geometric constraints are met by controlling the thermal diffusion in a cholesteric oligomer bilayer subjected to local changes in the molecular anchoring conditions. A multicriterion comparison reveals a very high level of biomimicry. Proof-of-concept prototypes of anti-counterfeiting tags are presented. The present design involves an economy of resources and a high versatility of chiral patterns unreached by the current manufacturing techniques such as metallic layer vacuum deposition, template embossing and various forms of lithography which are limited and often prohibitively expensive.

journal_name

Nat Commun

journal_title

Nature communications

authors

Scarangella A,Soldan V,Mitov M

doi

10.1038/s41467-020-17884-0

subject

Has Abstract

pub_date

2020-08-14 00:00:00

pages

4108

issue

1

issn

2041-1723

pii

10.1038/s41467-020-17884-0

journal_volume

11

pub_type

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