Iridescent Color of a Shell of the Mollusk Pinctada Margaritifera Caused by Diffraction

Liu, Y.; Shigley, James E.; Hurwit, K. N.

doi:10.1364/oe.4.000177

Cited by 78 publications

(71 citation statements)

References 5 publications

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“…At room temperature, a single PDGI bilayer has a high modulus in the order of several MPa (~4000 kPa) and the PAAm matrix is much softer than the bilayer, with a 9 modulus of few kPa (5 kPa). Thus, the PDGI/PAAm hydrogel is said to have a stratified structure consisting of two alternating layer structures, one is rigid PDGI and another is soft PAAm layers, similar to the structure found in some biological systems showing structural colors, such as in iridophore of tropical fishes [33,34] and nacre [34] which is crucially important to be a tough material.…”

Section: Anisotropic Property and Stratified Layer Structure Modelmentioning

confidence: 83%

Multi-functions of hydrogel with bilayer-based lamellar structure

Haque

Gong

2013

Reactive and Functional Polymers

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A novel hybrid hydrogel has been developed by combining bilayer-based lamellar structure of a self-assembled polymer surfactant and polymer network of conventional hydrogel system. A wide range of lamellar structure from micro-domain up to macro-domain (cm-scale) has been successfully generated in the hydrogel. Flat, infinitely large, and perfectly aligned lamellar macro-domain was formed by applying mechanical shear to the gel forming precursor solution containing monomer, cross-linker, and initiator. The obtained hydrogel system contains macroscopic, single-domain, periodical stacking of integrated microscopic lamellar bilayers inside the polymer matrix of the hydrogel. Periodical stacking of the bilayers in the hydrogel selectively diffract visible light to exhibit magnificent structural color. Due to the uniaxial orientation of the bilayer, the hydrogel possesses superb functions that have never been realized before, such as the one-dimensional swelling, anisotropic Young's modulus, anisotropic molecular permeation, and diffusion. Furthermore, the hydrogel exhibits excellent color tuning ability over a wide spectrum range by mechanical stimuli.3

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Section: Anisotropic Property and Stratified Layer Structure Modelmentioning

confidence: 83%

Multi-functions of hydrogel with bilayer-based lamellar structure

Haque

Gong

2013

Reactive and Functional Polymers

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“…white on beetle carapaces [9]) and optical effects such as gloss. Iridescence can be produced by diffraction gratings, or when light passes through multiple semi-transparent materials that differ in refractive index, causing light to phase-shift and cancel out particular wavelengths at particular viewing angles [4,10,11]. Gloss, which is loosely defined as the specular or mirror-like component of light reflection, is a common component of animal coloration and is present in invertebrates, vertebrates and plants [2,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

A nanostructural basis for gloss of avian eggshells

Igic

Fecheyr-Lippens

Xiao

et al. 2015

J. R. Soc. Interface.

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The role of pigments in generating the colour and maculation of birds' eggs is well characterized, whereas the effects of the eggshell's nanostructure on the visual appearance of eggs are little studied. Here, we examined the nanostructural basis of glossiness of tinamou eggs. Tinamou eggs are well known for their glossy appearance, but the underlying mechanism responsible for this optical effect is unclear. Using experimental manipulations in conjunction with angle-resolved spectrophotometry, scanning electron microscopy, atomic force microscopy and chemical analyses, we show that the glossy appearance of tinamou eggshells is produced by an extremely smooth cuticle, composed of calcium carbonate, calcium phosphate and, potentially, organic compounds such as proteins and pigments. Optical calculations corroborate surface smoothness as the main factor producing gloss. Furthermore, we reveal the presence of weak iridescence on eggs of the great tinamou (Tinamus major), an optical effect never previously documented for bird eggs. These data highlight the need for further exploration into the nanostructural mechanisms for the production of colour and other optical effects of avian eggshells.

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“…It is probable, that both components, mineral and organic are involved in colours. The thickness and structure of the nacreous layer are repeatedly evoked (Liu et al 1999). However, a mild decalcification process shows that the organic membranes surrounding the structural units (prisms, tablets) are colored, as the soluble organic matrices (unpublished data).…”

Section: Relevance Of the Methodsmentioning

confidence: 99%

Colour or no colour in the juvenile shell of the black lip pearl oyster, Pinctada margaritifera?

Trinkler

Moullac

Cuif

et al. 2012

Aquat. Living Resour.

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-Pinctada margaritifera mollusc is cultivated in French Polynesia for the production of black pearls. For this study, the colour of juvenile samples (48 days old) was investigated in the visible range spectra (430-700 nm) using spectrophotometry. A first measurement was done with the soft parts still inside the shell (entire animal). Then, the soft parts were removed in order to do a second measurement on the growing edge of the shell. Comparison of the two measurements shows that the estimation of the living animal colour with unaided eye is strongly influenced by the colour of the soft parts. The use of the International Commission on Illumination (ISI) chromaticity diagram shows that at this growth stage, the shells are "white"; i.e. present no absorptions to the visible part. Multivariate statistical analyses based on the intensities of 6 wavelengths show that the shell colour is less variable than the colours of the entire animals. Wavelength intensities of the shells are similar, so no colour trend is visible. On the other hand, the colours of the entire animals are darker, and more variable. At this growth stage, the shell colour is not predictable for a potential selection of receiver or donor.

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Iridescent Color of a Shell of the Mollusk Pinctada Margaritifera Caused by Diffraction

Cited by 78 publications

References 5 publications

Multi-functions of hydrogel with bilayer-based lamellar structure

Multi-functions of hydrogel with bilayer-based lamellar structure

A nanostructural basis for gloss of avian eggshells

Colour or no colour in the juvenile shell of the black lip pearl oyster, Pinctada margaritifera?

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