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      Mechanical properties of 3D printed macroscopic models of schwarzites

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          Block Copolymers—Designer Soft Materials

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            Mechanical characterization of 3D-printed polymers

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              Gyroid cuticular structures in butterfly wing scales: biological photonic crystals

              We present a systematic study of the cuticular structure in the butterfly wing scales of some papilionids (Parides sesostris and Teinopalpus imperialis) and lycaenids (Callophrys rubi, Cyanophrys remus, Mitoura gryneus and Callophrys dumetorum). Using published scanning and transmission electron microscopy (TEM) images, analytical modelling and computer-generated TEM micrographs, we find that the three-dimensional cuticular structures can be modelled by gyroid structures with various filling fractions and lattice parameters. We give a brief discussion of the formation of cubic gyroid membranes from the smooth endoplasmic reticulum in the scale's cell, which dry and harden to leave the cuticular structure behind when the cell dies. The scales of C. rubi are a potentially attractive biotemplate for producing three-dimensional optical photonic crystals since for these scales the cuticle-filling fraction is nearly optimal for obtaining the largest photonic band gap in a gyroid structure.
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                Author and article information

                Contributors
                (View ORCID Profile)
                (View ORCID Profile)
                Journal
                Nano Select
                Nano Select
                Wiley
                2688-4011
                2688-4011
                February 2022
                July 05 2021
                February 2022
                : 3
                : 2
                : 450-458
                Affiliations
                [1 ]Department of Applied Physics, “Gleb Wataghin” Institute of Physics University of Campinas‐UNICAMP Campinas SP Brazil
                [2 ]Physics Department Federal University of Paraná Curitiba PR Brazil
                [3 ]Metallurgical and Materials Engineering Indian Institute of Technology Kharagpur Kharagpur India
                [4 ]Department of Manufacturing and Materials Engineering, School of Mechanical Engineering University of Campinas ‐ UNICAMP Campinas SP Brazil
                Article
                10.1002/nano.202100147
                b5569c17-a439-4bfc-bd92-bf0cfbbb0097
                © 2022

                http://creativecommons.org/licenses/by/4.0/

                http://doi.wiley.com/10.1002/tdm_license_1.1

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