Journal
ADVANCED MATERIALS
Volume 32, Issue 47, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002681
Keywords
bottlebrush block copolymers; confined self-assembly; inverse photonic glasses; microspheres; non-iridescent structural colors
Categories
Funding
- European Research Council [ERC-2014-STG H2020 639088, ERC-2017-POC 790518]
- BBSRC David Phillips Fellowship [BB/K014617/1]
- EPSRC [EP/N016920/1, EP/R511675/1]
- Royal Society [IE160420]
- National Natural Science Foundation of China [51873098]
- Winton Program for the Physics of Sustainability
- BBSRC [BB/K014617/1] Funding Source: UKRI
- EPSRC [EP/N016920/1] Funding Source: UKRI
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Photonic materials with angular-independent structural color are highly desirable because they offer the broad viewing angles required for application as colorants in paints, cosmetics, textiles, or displays. However, they are challenging to fabricate as they require isotropic nanoscale architectures with only short-range correlation. Here, porous microparticles with such a structure are produced in a single, scalable step from an amphiphilic bottlebrush block copolymer. This is achieved by exploiting a novel controlled micellization self-assembly mechanism within an emulsified toluene-in-water droplet. By restricting water permeation through the droplet interface, the size of the pores can be precisely addressed, resulting in structurally colored pigments. Furthermore, the reflected color can be tuned to reflect across the full visible spectrum using only a single polymer (M-n = 290 kDa) by altering the initial emulsification conditions. Such photonic pigments have several key advantages over their crystalline analogues, as they provide isotropic structural coloration that suppresses iridescence and improves color purity without the need for either refractive index matching or the inclusion of a broadband absorber.
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