Three-dimensional printing of photonic colloidal glasses into objects with isotropic structural color

Ahmet F. Demirörs (), Erik Poloni, Maddalena Chiesa, Fabio L. Bargardi, Marco R. Binelli, Wilhelm Woigk, Lucas D. C. Castro, Nicole Kleger, Fergal B. Coulter, Alba Sicher, Henning Galinski, Frank Scheffold and André R. Studart ()
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Ahmet F. Demirörs: ETH Zurich
Erik Poloni: ETH Zurich
Maddalena Chiesa: ETH Zurich
Fabio L. Bargardi: ETH Zurich
Marco R. Binelli: ETH Zurich
Wilhelm Woigk: ETH Zurich
Lucas D. C. Castro: ETH Zurich
Nicole Kleger: ETH Zurich
Fergal B. Coulter: ETH Zurich
Alba Sicher: ETH Zurich
Henning Galinski: ETH Zurich
Frank Scheffold: University of Fribourg
André R. Studart: ETH Zurich

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Structural color is frequently exploited by living organisms for biological functions and has also been translated into synthetic materials as a more durable and less hazardous alternative to conventional pigments. Additive manufacturing approaches were recently exploited for the fabrication of exquisite photonic objects, but the angle-dependence observed limits a broader application of structural color in synthetic systems. Here, we propose a manufacturing platform for the 3D printing of complex-shaped objects that display isotropic structural color generated from photonic colloidal glasses. Structurally colored objects are printed from aqueous colloidal inks containing monodisperse silica particles, carbon black, and a gel-forming copolymer. Rheology and Small-Angle-X-Ray-Scattering measurements are performed to identify the processing conditions leading to printed objects with tunable structural colors. Multimaterial printing is eventually used to create complex-shaped objects with multiple structural colors using silica and carbon as abundant and sustainable building blocks.

Date: 2022
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DOI: 10.1038/s41467-022-32060-2

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