Self-assembly of amorphous biophotonic nanostructures by phase separation

Dufresne, Eric R.; Noh, Heeso; Saranathan, Vinodkumar; Mochrie, S. G. J.; Cao, Hui; Prum, Richard O.

doi:10.1039/b902775k

Cited by 227 publications

(231 citation statements)

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“…Nature has solved this problem by incorporating disorder into its photonic structures in order to increase their angular visibility, for example in the feather shown in Figure 1A,i-ii. 3,5 Similarly, disorder introduced into CBPM can lead to angle-independent structural colors. [180][181][182][183][184][185] An example of such angle independence can be seen in Figure 8C.…”

Section: Factors Affecting Optical Applicationsmentioning

confidence: 99%

“…For example, it accounted for a >50% increase in the efficiency of a DSSC, 447 and can be seen clearly in Figure 30 for a photoanode made from WO 3 , where the efficiency varies as a function of wavelength depending on the periodicity of the structure. 393 There is a clear efficiency enhancement for the structure made with 200 nm colloids, which has a photonic bandgap overlapping with the electronic absorption of WO 3 . In addition to ordered structures for increased absorption of certain wavelengths, disordered structures can be used to increase scattering of all wavelengths, 71 which also improves absorption by increasing the path length in the structure.…”

Section: Factors Influencing Electrode Applicationsmentioning

confidence: 99%

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A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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Nature evolved a variety of hierarchical structures that produce sophisticated functions. Inspired by these natural materials, colloidal self-assembly provides a convenient way to produce structures from simple building blocks with a variety of complex functions beyond those found in nature. In particular, colloid-based porous materials (CBPM) can be made from a wide variety of materials. The internal structure of CBPM also has several key attributes, namely porosity on a sub-micrometer length scale, interconnectivity of these pores, and a controllable degree of order. The combination of structure and composition allow CBPM to attain properties important for modern applications such as photonic inks, colorimetric sensors, self-cleaning surfaces, water purification systems, or batteries. This review summarizes recent developments in the field of CBPM, including principles for their design, fabrication, and applications, with a particular focus on structural features and materials' properties that enable these applications. We begin with a short introduction to the wide variety of patterns that can be generated by colloidal self-assembly and templating processes. We then discuss different applications of such structures, focusing on optics, wetting, sensing, catalysis, and electrodes. Different fields of applications require different properties, yet the modularity of the assembly process of CBPM provides a high degree of tunability and tailorability in composition and structure. We examine the significance of properties such as structure, composition, and degree of order on the materials' functions and use, as well as trends in and future directions for the development of CBPM.

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Section: Factors Affecting Optical Applicationsmentioning

confidence: 99%

Section: Factors Influencing Electrode Applicationsmentioning

confidence: 99%

A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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“…Furthermore, they pointed out that these nanostructures bear a qualitative similarity to morphologies self-assembled during SD. Later, based on the SAXS data from two species, Dufresne et al [38] hypothesized that both channel and sphere nanostructures in birds could be self-assembled by arrested phase separation of filamentous b-keratin protein from the cellular cytoplasm. Further, they [38] proposed that the two classes of nanostructures, channeland sphere-types, could possibly be self-assembled by SD and nucleation-and-growth mechanisms, respectively.…”

Section: Self-assembly By Phase Separationmentioning

confidence: 99%

“…Hence, SAXS provides single scattering data that are highly suited to quantitatively predict the interactions of visible light with the nanostructure without artefacts resulting from multiple scattering. Recently, we applied SAXS to a few species with non-iridescent feather barb structural colours-Eastern Bluebird (S. sialis), Purple-throated Cotinga (Cotinga maynana), Blue Cotinga (Cotinga cotinga), Asian Fairy Bluebird (Irena puella), Indian Roller (Coracias benghalensis) and Blue Penguin (Eudyptula minor)-and successfully modelled the directional light scattering properties of their underlying amorphous photonic nanostructures [13,15,[36][37][38]]. …”

Section: Small Angle X-ray Scattering (Saxs)mentioning

confidence: 99%

“…10-15 mm 3 but vary with taxon [49]). The azimuthally averaged scattering profiles were calculated from the CCD-collected two-dimensional SAXS speckle diffraction patterns using the freely available Matlabimplemented software, XPCSGUI, developed by beamline 8-ID (http://8id.xor.aps.anl.gov/UserInfo/Analysis/) at 200 equal q-partitions, and with customized masks to filter out the beam stop [15,38,50]. SAXS data from the feathers of Cittura cyanotis and the yellow throat of Psarisomus dalhousiae (see electronic supplementary material, tables S1 and S2) were collected using a 7.35 keV beam (1.68 Å , 50 mm horizontal Â 50 mm vertical, 9.24 m camera length, 50 Â 0.1 s exposures) on a Pilatus2M detector at beamline I22 of the Diamond Light Source, Didcot, UK.…”

Section: Small Angle X-ray Scatteringmentioning

confidence: 99%

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Structure and optical function of amorphous photonic nanostructures from avian feather barbs: a comparative small angle X-ray scattering (SAXS) analysis of 230 bird species

Saranathan

Forster

Noh

et al. 2012

J. R. Soc. Interface.

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Non-iridescent structural colours of feathers are a diverse and an important part of the phenotype of many birds. These colours are generally produced by three-dimensional, amorphous (or quasi-ordered) spongy b-keratin and air nanostructures found in the medullary cells of feather barbs. Two main classes of three-dimensional barb nanostructures are known, characterized by a tortuous network of air channels or a close packing of spheroidal air cavities. Using synchrotron small angle X-ray scattering (SAXS) and optical spectrophotometry, we characterized the nanostructure and optical function of 297 distinctly coloured feathers from 230 species belonging to 163 genera in 51 avian families. The SAXS data provided quantitative diagnoses of the channel-and sphere-type nanostructures, and confirmed the presence of a predominant, isotropic length scale of variation in refractive index that produces strong reinforcement of a narrow band of scattered wavelengths. The SAXS structural data identified a new class of rudimentary or weakly nanostructured feathers responsible for slate-grey, and blue-grey structural colours. SAXS structural data provided good predictions of the singlescattering peak of the optical reflectance of the feathers. The SAXS structural measurements of channel-and sphere-type nanostructures are also similar to experimental scattering data from synthetic soft matter systems that self-assemble by phase separation. These results further support the hypothesis that colour-producing protein and air nanostructures in feather barbs are probably self-assembled by arrested phase separation of polymerizing b-keratin from the cytoplasm of medullary cells. Such avian amorphous photonic nanostructures with isotropic optical properties may provide biomimetic inspiration for photonic technology.

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Colour Due to Diffraction

2019

Colour and the Optical Properties of Materials

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Self-assembly of amorphous biophotonic nanostructures by phase separation

Cited by 227 publications

References 14 publications

A colloidoscope of colloid-based porous materials and their uses

A colloidoscope of colloid-based porous materials and their uses

Structure and optical function of amorphous photonic nanostructures from avian feather barbs: a comparative small angle X-ray scattering (SAXS) analysis of 230 bird species

Colour Due to Diffraction

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