Colloidal Photonic Inks for Mechanochromic Films and
Patterns with Structural Colors of High Saturation
Posted on 2019-09-23 - 18:43
Colloidal arrays
show structural colors through wavelength-selective
diffraction. The structural colors are dynamically tunable with mechanical
deformation for a non-close-packed colloidal array embedded in an
elastic matrix. However, such compositions usually render photonic
materials transparent and structural color low saturated. In this
work, we formulate colloidal inks to produce mechanochromic films
and patterns that show consistent structural colors with high saturation.
The inks are composed of a high-volume fraction of silica particles
and a low fraction of polydopamine nanoparticles dispersed in an elastomer-forming
resin. The silica particles have repulsive interparticle potential
and form a non-close-packed array, whereas polydopamine nanoparticles
are positioned in the interstitial areas. The colloidal arrays are
captured in the elastomer by photopolymerization of the resin. As
polydopamine nanoparticles reduce incoherent scattering and make the
materials opaque, the structural color arisen from the colloidal array
is pronounced and independent of the background. Moreover, the photonic
materials show a dynamic and reversible change of structural color
according to deformation. For large strains, the photonic effect is
overwhelmed by absorption of polydopamine nanoparticles, rendering
the materials dark brown. This unique mechanochromic property is used
to make patterns that are reversibly color-tunable and hidable, which
are appealing for user-interactive anti-counterfeiting and active
camouflage.
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Lee, Gun Ho; Han, Sang Hoon; Kim, Jong Bin; Kim, Jong Hyun; Lee, Jung Min; Kim, Shin-Hyun (2019). Colloidal Photonic Inks for Mechanochromic Films and
Patterns with Structural Colors of High Saturation. ACS Publications. Collection. https://doi.org/10.1021/acs.chemmater.9b02938