Bright structural color films independent of background prepared by the dip-coating of biomimetic melanin-like particles having polydopamine shell layers

Kohri, Michinari; Yamazaki, Shigeaki; Kawamura, Ayaka; Taniguchi, Tadatsugu; Kishikawa, Keiki

doi:10.1016/j.colsurfa.2017.03.035

Cited by 45 publications

(36 citation statements)

References 25 publications

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“…However, the reported transition from the no-reflection to back-reflection regime is still rather smooth resulting in low color saturation. Some experimental effort was invested in PhG based structural colors with core-shell particles leading to marginal spectral improvement only [14,[25][26][27][28], which is due to the lack of the theoretical understanding of the influence of core-shell geometry on color purity. Most of the explanations so far are based on a manipulation of Mie resonances in the particles [1,3,16,22].…”

Section: Introductionmentioning

confidence: 99%

Photonic glass for high contrast structural color

Shang¹,

Maiwald²,

Renner³

et al. 2018

Sci Rep

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Non-iridescent structural colors based on disordered arrangement of monodisperse spherical particles, also called photonic glass, show low color saturation due to gradual transition in the reflectivity spectrum. No significant improvement is usually expected from particles optimization, as Mie resonances are broad for small dielectric particles with moderate refractive index. Moreover, the short range order of a photonic glass alone is also insufficient to cause sharp spectral features. We show here, that the combination of a well-chosen particle geometry with the short range order of a photonic glass has strong synergetic effects. Using a first-order approximation and an Ewald sphere construction the reflectivity of such structures can be related to the Fourier transform of the permittivity distribution. The Fourier transform required for a highly saturated color can be achieved by tailoring the substructure of the motif. We show that this can be obtained by choosing core-shell particles with a non-monotonous refractive index distribution from the center of the particle through the shell and into the background material. The first-order theoretical predictions are confirmed by numerical simulations.

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Section: Introductionmentioning

confidence: 99%

Photonic glass for high contrast structural color

Shang¹,

Maiwald²,

Renner³

et al. 2018

Sci Rep

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“…16 Such a structure can be prepared articially via the self-assembly of monodisperse particles as colloidal crystals in which the particle spacing is on the order of the wavelength of light. [17][18][19][20][21][22] These colors vary with the viewing angle since the resonance condition changes as the incident light direction varies with respect to the crystal orientation. On the other hand, angle-independent structural color morphologies can also be found in nature.…”

Section: Introductionmentioning

confidence: 99%

Structurally colored coating films with tunable iridescence fabricated via cathodic electrophoretic deposition of silica particles

et al. 2018

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In recent years, colloidal arrays of submicrometer-sized monodisperse particles used as structurally colored coatings have drawn great attention due to their non-bleaching properties and low impact on human health and the environment. In this paper, structurally colored coating films were fabricated using monodisperse SiO 2 particles via the cathodic electrophoretic deposition (EPD) technique. The addition of a strong polycation, poly(diallyldimethylammonium chloride) (PDDA), enables the cathodic EPD of SiO 2 particles and carbon black (CB) additives. Optimizing the quantities of PDDA and CB results in the appearance of vivid structural color from the coating films. The arrangement of the particle array is controllable by varying the pH of the water added to the coating sols for EPD. Structurally colored coating films with and without iridescence, i.e., angular dependence, can be fabricated on demand by a simple operation of the EPD process. In addition, the coating film prepared by cathodic EPD displayed high abrasion resistance because PDDA acts not only as a charge control agent but also as a binder.

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“…By controlling the particles' concentration, diameter, and arrangement, different structural colors and textures are produced. In another recent work, melanin‐like particles, i.e., PS core nanoparticle dip‐coated with PDA layers as shell, have been used to produce bright structural colors that are independent of the background colors . Different diameters of PS nanoparticles result in different structural colors, although this system is not as angle independent as the previous one.…”

Section: Fabrication Of Bioinspired Diffraction Elements: Methods Andmentioning

confidence: 99%

Bioinspired Stimuli‐Responsive Color‐Changing Systems

2018

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Stimuli-responsive colors are a unique characteristic of certain animals, evolved as either a method to hide from enemies and prey or to communicate their presence to rivals or mates. From a material science perspective, the solutions developed by Mother Nature to achieve these effects are a source of inspiration to scientists for decades. Here, an updated overview of the literature on bioinspired stimuli-responsive color-changing systems is provided. Starting from natural systems, which are the source of inspiration, a classification of the different solutions proposed is given, based on the stimuli used to trigger the color-changing effect.

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Bright structural color films independent of background prepared by the dip-coating of biomimetic melanin-like particles having polydopamine shell layers

Cited by 45 publications

References 25 publications

Photonic glass for high contrast structural color

Photonic glass for high contrast structural color

Structurally colored coating films with tunable iridescence fabricated via cathodic electrophoretic deposition of silica particles

Bioinspired Stimuli‐Responsive Color‐Changing Systems

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