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Bio-inspired black pigments from plastic wastes
Summary
Researchers developed a biomimetic process for converting plastic waste into nanostructured carbon black and graphene using point-of-use microreactors, then tuned the resulting particles to produce high-performance black inks with controllable opacity and reflectivity inspired by structural color in butterfly wings.
Black ink is central to modern visual art, valued for its depth, contrast, and emotional impact. This project presents a sustainable, biomimetic approach to producing high-performance black inks by converting waste plastics into nanostructured carbon materials. Using point-of-use microreactors, we thermally or catalytically convert plastic waste into carbon black, graphene, or carbon nanospheres. These decentralized systems reduce reliance on fossil feedstocks, lower emissions, and eliminate centralized processing. By tuning reaction conditions, we control particle size and structure to optimize ink darkness, opacity, and light interaction. Inspired by structural color in nature—such as iridescence in butterfly wings—we explore similar nanoscale features to introduce tunable reflectivity and optical effects into carbon inks. This expands the expressive range of black ink while retaining its boldness. By combining waste valorization, nanomaterial engineering, and biomimetic optics, this work creates a new class of sustainable inks for artistic and industrial applications, transforming plastic waste into a functional and creative material.