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 Communjournal_title
Nature communicationsauthors
Scarangella A,Soldan V,Mitov Mdoi
10.1038/s41467-020-17884-0subject
Has Abstractpub_date
2020-08-14 00:00:00pages
4108issue
1issn
2041-1723pii
10.1038/s41467-020-17884-0journal_volume
11pub_type
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