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Chuang WT, Chen SP, Tsai YB, Sun YS, Lin JM, Chen CY, Tsai YW, Chou CM, Hung YC, Chen TW, Wang WE, Huang CC, Hong PD, Jeng US, Chiang YW. Spontaneous Photonic Jammed Packing of Core-Shell Colloids in Conductive Aqueous Inks for Non-Iridescent Structural Coloration. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 39174350 DOI: 10.1021/acsami.4c09049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/24/2024]
Abstract
Integrating structural colors and conductivity into aqueous inks has the potential to revolutionize wearable electronics, providing flexibility, sustainability, and artistic appeal to electronic components. This study aims to introduce bioinspired color engineering to conductive aqueous inks. Our self-assembly approach involves mixing poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with sulfonic acid-modified polystyrene (sPS) colloids to generate non-iridescent structural colors in the inks. This spontaneous structural coloration occurs because PEDOT:PSS and sPS colloids can self-assemble into core-shell structures and reversibly cluster into photonic aggregates of maximally random jammed packing within the aqueous environment, as demonstrated by small-angle X-ray scattering. Dissipative particle dynamics simulation confirms that the self-assembly aggregation of PEDOT:PSS chains and sPS colloids can be manipulated by the polymer-colloid interactions. Utilizing the finite-difference time-domain method, we demonstrate that the photonic aggregates of the core-shell colloids achieve close to maximum jammed packing, making them suitable for producing vivid structural colors. These versatile conductive inks offer adjustable color saturation and conductivity, with conductivity levels reaching 36 S cm-1 through the addition of polyethylene glycol oligomer, while enhanced water resistance and mechanical stability are achieved by doping with a cross-linker, poly(ethylene glycol) diglycidyl ether. With these unique features, the inks can create flexible, patterned circuits through processes like coating, writing, and dyeing on large areas, providing eco-friendly, visually appealing colors for customizable, stylish, comfortable, and wearable electronic devices.
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Affiliation(s)
- Wei-Tsung Chuang
- National Synchrotron Radiation Research Center, Hsinchu 300092, Taiwan
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106335, Taiwan
| | - Shu-Ping Chen
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan
| | - Yu-Bo Tsai
- Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan
| | - Ya-Sen Sun
- Department of Chemical Engineering, National Cheng Kung University, Tainan City 70101, Taiwan
| | - Jhih-Min Lin
- National Synchrotron Radiation Research Center, Hsinchu 300092, Taiwan
| | - Chun-Yu Chen
- National Synchrotron Radiation Research Center, Hsinchu 300092, Taiwan
| | - Yi-Wei Tsai
- National Synchrotron Radiation Research Center, Hsinchu 300092, Taiwan
| | - Che-Min Chou
- National Synchrotron Radiation Research Center, Hsinchu 300092, Taiwan
| | - Yu-Chueh Hung
- Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Tse-Wei Chen
- Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Wei-En Wang
- Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Chao-Chin Huang
- Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Po-Da Hong
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center, Hsinchu 300092, Taiwan
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yeo-Wan Chiang
- Department of Materials and Optoelectronic Science and Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
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2
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Hegyi G, Laczi M, Wacha A, Gyarmathy H, Klein Á, Rosivall B, Sarkadi F, Szabó G, Török J. Prediction of individual differences in non-iridescent structural plumage colour from nanostructural periodicity and regularity. ROYAL SOCIETY OPEN SCIENCE 2024; 11:231804. [PMID: 39100180 PMCID: PMC11296197 DOI: 10.1098/rsos.231804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 03/13/2024] [Accepted: 04/26/2024] [Indexed: 08/06/2024]
Abstract
Non-iridescent structural plumage reflectance is a sexually selected indicator of individual quality in several bird species. However, the structural basis of individual differences remains unclear. In particular, the dominant periodicity of the quasi-ordered feather barb nanostructure is of key importance in colour generation, but no study has successfully traced back reflectance parameters, and particularly hue, to nanostructural periodicity, although this would be key to deciphering the information content of individual variation. We used matrix small-angle X-ray scattering measurements of intact, stacked feather samples from the blue tit crown to estimate the sex-dependence and individual variation of nanostructure and its effects on light reflectance. Measures of nanostructural periodicity successfully predicted brightness, ultraviolet chroma and also hue, with statistically similar effects in the two sexes. However, we also observed a lack of overall effect of the nanostructural inhomogeneity estimate on reflectance chromaticity, sex-dependent accuracy in hue prediction and strong sex-dependence in position estimation error. We suggest that reflectance attributes are modified by other feather structures in a sex-specific manner, and that within-individual variation in nanostructural parameters exists within or among feathers and this confounds the interpretation of structure-reflectance relationships at the plumage area level.
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Affiliation(s)
- Gergely Hegyi
- Department of Systematic Zoology and Ecology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest1117, Hungary
- HUN-REN-ELTE-MTM Integrative Ecology Research Group, Pázmány Péter sétány 1/C, Budapest1117, Hungary
| | - Miklós Laczi
- Department of Systematic Zoology and Ecology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest1117, Hungary
- HUN-REN-ELTE-MTM Integrative Ecology Research Group, Pázmány Péter sétány 1/C, Budapest1117, Hungary
- The Barn Owl Foundation, Temesvári út 8, Orosztony8744, Hungary
| | - András Wacha
- Biological Nanochemistry Research Group, Institute of Materials and Environmental Chemistry, HUN-REN Research Centre for Natural Sciences, Magyar Tudósok körútja 2, Budapest1117, Hungary
| | - Helga Gyarmathy
- Department of Systematic Zoology and Ecology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest1117, Hungary
| | - Ákos Klein
- The Barn Owl Foundation, Temesvári út 8, Orosztony8744, Hungary
| | - Balázs Rosivall
- Department of Systematic Zoology and Ecology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest1117, Hungary
| | - Fanni Sarkadi
- Department of Systematic Zoology and Ecology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest1117, Hungary
| | - Gyula Szabó
- Department of Systematic Zoology and Ecology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest1117, Hungary
- Lendület Ecosystem Services Research Group, Institute of Ecology and Botany, HUN-REN Centre for Ecological Research, Alkotmány út 2-4, Vácrátót2163, Hungary
| | - János Török
- Department of Systematic Zoology and Ecology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest1117, Hungary
- HUN-REN-ELTE-MTM Integrative Ecology Research Group, Pázmány Péter sétány 1/C, Budapest1117, Hungary
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3
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Hardy M, Goldberg Oppenheimer P. 'When is a hotspot a good nanospot' - review of analytical and hotspot-dominated surface enhanced Raman spectroscopy nanoplatforms. NANOSCALE 2024; 16:3293-3323. [PMID: 38273798 PMCID: PMC10868661 DOI: 10.1039/d3nr05332f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Accepted: 01/13/2024] [Indexed: 01/27/2024]
Abstract
Substrate development in surface-enhanced Raman spectroscopy (SERS) continues to attract research interest. In order to determine performance metrics, researchers in foundational SERS studies use a variety of experimental means to characterize the nature of substrates. However, often this process would appear to be performed indiscriminately without consideration for the physical scale of the enhancement phenomena. Herein, we differentiate between SERS substrates whose primary enhancing structures are on the hundreds of nanometer scale (analytical SERS nanosubstrates) and those whose main mechanism derives from nanometric-sized gaps (hot-spot dominated SERS substrates), assessing the utility of various characterization methods for each substrate class. In this context, characterization approaches in white-light spectroscopy, electron beam methods, and scanning probe spectroscopies are reviewed. Tip-enhanced Raman spectroscopy, wavelength-scanned SERS studies, and the impact of surface hydrophobicity are also discussed. Conclusions are thus drawn on the applicability of each characterization technique regarding amenability for SERS experiments that have features at different length scales. For instance, while white light spectroscopy can provide an indication of the plasmon resonances associated with 10 s-100 s nm-scale structures, it may not reveal information about finer surface texturing on the true nm-scale, critical for SERS' sensitivity, and in need of investigation via scanning probe techniques.
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Affiliation(s)
- Mike Hardy
- School of Chemical Engineering, College of Engineering and Physical Sciences, University of Birmingham, B15 2TT, UK.
- Centre for Quantum Materials and Technologies, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK.
| | - Pola Goldberg Oppenheimer
- School of Chemical Engineering, College of Engineering and Physical Sciences, University of Birmingham, B15 2TT, UK.
- Healthcare Technologies Institute, Institute of Translational Medicine, Birmingham B15 2TH, UK
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4
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Davis TJ, Ospina-Rozo L, Stuart-Fox D, Roberts A. Modelling structural colour from helicoidal multi-layer thin films with natural disorder. OPTICS EXPRESS 2023; 31:36531-36546. [PMID: 38017803 DOI: 10.1364/oe.503881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 10/05/2023] [Indexed: 11/30/2023]
Abstract
A coupled mode theory based on Takagi-Taupin equations describing electromagnetic scattering from distorted periodic arrays is applied to the problem of light scattering from beetles. We extend the method to include perturbations in the permittivity tensor to helicoidal arrays seen in many species of scarab beetle and optically anisotropic layered materials more generally. This extension permits analysis of typical dislocations arising from the biological assembly process and the presence of other structures in the elytra. We show that by extracting structural information from transmission electron microscopy data, including characteristic disorder parameters, good agreement with spectral specular and non-specular reflectance measurements is obtained.
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Shapturenka P, Isaac Zakaria N, Birkholz F, Gordon MJ. Extending the diatom's color palette: non-iridescent, disorder-mediated coloration in marine diatom-inspired nanomembranes. OPTICS EXPRESS 2023; 31:21658-21671. [PMID: 37381258 DOI: 10.1364/oe.487180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 04/25/2023] [Indexed: 06/30/2023]
Abstract
The intricate, siliceous exoskeleton of many marine diatoms (single-celled phytoplankton) is decorated with an array of sub-micron, quasi-ordered pores that are known to provide protective and multiple life-sustaining functions. However, the optical functionality of any given diatom valve is limited because valve geometry, composition, and ordering are genetically programmed. Nonetheless, the near- and sub-wavelength features of diatom valves provide inspiration for novel photonic surfaces and devices. Herein, we explore the optical design space for optical transmission, reflection, and scattering in diatom-like structures by computationally deconstructing the diatom frustule, assigning and nondimensionalizing Fano-resonant behavior with configurations of increasing refractive index contrast (Δn), and gauging the effects of structural disorder on the resulting optical response. Translational pore disorder, especially in higher-index materials, was found to evolve Fano resonances from near-unity reflection and transmission to modally confined, angle-independent scattering, which is key to non-iridescent coloration in the visible wavelength range. High-index, frustule-like TiO2 nanomembranes were then designed to maximize backscattering intensity and fabricated using colloidal lithography. These synthetic diatom surfaces showed saturated, non-iridescent coloration across the visible spectrum. Overall, this diatom-inspired platform could be useful in designing tailored, functional, and nanostructured surfaces for applications in optics, heterogeneous catalysis, sensing, and optoelectronics.
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Jeon DJ, Ji S, Lee E, Kang J, Kim J, D'Alba L, Manceau M, Shawkey MD, Yeo JS. How keratin cortex thickness affects iridescent feather colours. ROYAL SOCIETY OPEN SCIENCE 2023; 10:220786. [PMID: 36686555 PMCID: PMC9832292 DOI: 10.1098/rsos.220786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 12/06/2022] [Indexed: 06/17/2023]
Abstract
The bright, saturated iridescent colours of feathers are commonly produced by single and multi-layers of nanostructured melanin granules (melanosomes), air and keratin matrices, surrounded by an outer keratin cortex of varying thicknesses. The role of the keratin cortex in colour production remains unclear, despite its potential to act as a thin film or absorbing layer. We use electron microscopy, optical simulations and oxygen plasma-mediated experimental cortex removal to show that differences in keratin cortex thickness play a significant role in producing colours. The results indicate that keratin cortex thickness determines the position of the major reflectance peak (hue) from nanostructured melanosomes of common pheasant (Phasianus colchicus) feathers. Specifically, the common pheasant has appropriate keratin cortex thickness to produce blue and green structural colours. This finding identifies a general principle of structural colour production and sheds light on the processes that shaped the evolution of brilliant iridescent colours in the common pheasant.
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Affiliation(s)
- Deok-Jin Jeon
- School of Integrated Technology, Yonsei Institute of Convergence Technology, Yonsei University, Incheon 21983, Republic of Korea
| | - Seungmuk Ji
- School of Integrated Technology, Yonsei Institute of Convergence Technology, Yonsei University, Incheon 21983, Republic of Korea
| | - Eunok Lee
- Department of Research Planning, National Institute of Ecology, Chungcheongnam-do 33657, Republic of Korea
| | - Jihun Kang
- School of Integrated Technology, Yonsei Institute of Convergence Technology, Yonsei University, Incheon 21983, Republic of Korea
| | - Jiyeong Kim
- Ecological Technology Research Team, Division of Ecological Applications Research, National Institute of Ecology, Chungcheongnam-do 33657, Republic of Korea
| | - Liliana D'Alba
- Evolution and Optics of Nanostructures Group, Department of Biology, Ghent University, Ledeganckstraat 35, Ghent 9000, Belgium
- Naturalis Biodiversity Center, Darwinweg 2, Leiden 2333 CR, The Netherlands
| | - Marie Manceau
- Center for Interdisciplinary Research in Biology, CNRS UMR7241, INSERM U1050, Collège de France, Paris Sciences et Lettres University, 75006 Paris, France
| | - Matthew D. Shawkey
- Evolution and Optics of Nanostructures Group, Department of Biology, Ghent University, Ledeganckstraat 35, Ghent 9000, Belgium
| | - Jong-Souk Yeo
- School of Integrated Technology, Yonsei Institute of Convergence Technology, Yonsei University, Incheon 21983, Republic of Korea
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7
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Djeghdi K, Steiner U, Wilts BD. 3D Tomographic Analysis of the Order-Disorder Interplay in the Pachyrhynchus congestus mirabilis Weevil. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2202145. [PMID: 35852001 PMCID: PMC9475527 DOI: 10.1002/advs.202202145] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 06/15/2022] [Indexed: 06/15/2023]
Abstract
The bright colors of Pachyrhynchus weevils originate from complex dielectric nanostructures within their elytral scales. In contrast to previous work exhibiting highly ordered single-network diamond-type photonic crystals, here, it is shown by combining optical microscopy and spectroscopy measurements with 3D focused ion beam (FIB) tomography that the blue scales of P. congestus mirabilis differ from that of an ordered diamond structure. Through the use of FIB tomography on elytral scales filled with platinum (Pt) by electron beam-assisted deposition, it is revealed that the red scales of this weevil possess a periodic diamond structure, while the network morphology of the blue scales exhibit diamond morphology only on the single scattering unit level with disorder on longer length scales. Full wave simulations performed on the reconstructed volumes indicate that this local order is sufficient to open a partial photonic bandgap even at low dielectric constant contrast between chitin and air in the absence of long-range or translational order. The observation of disordered and ordered photonic crystals within a single organism opens up interesting questions on the cellular origin of coloration and studies on bio-inspired replication of angle-independent colors.
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Affiliation(s)
- Kenza Djeghdi
- Adolphe Merkle InstituteUniversity of FribourgChemin des Verdiers 4Fribourg1700Switzerland
| | - Ullrich Steiner
- Adolphe Merkle InstituteUniversity of FribourgChemin des Verdiers 4Fribourg1700Switzerland
| | - Bodo D. Wilts
- Adolphe Merkle InstituteUniversity of FribourgChemin des Verdiers 4Fribourg1700Switzerland
- Chemistry and Physics of MaterialsUniversity of SalzburgJakob‐Haringer‐Straße 2aSalzburg5020Austria
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8
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Fosbury RAE, Jeffery G. Reindeer eyes seasonally adapt to ozone-blue Arctic twilight by tuning a photonic tapetum lucidum. Proc Biol Sci 2022; 289:20221002. [PMID: 35765837 PMCID: PMC9240676 DOI: 10.1098/rspb.2022.1002] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Reindeer are the only mammal known to seasonally adapt their eyes to the extremely blue colour of the extended twilight that occupies a large part of the winter 24 h cycle in their Arctic habitat. We describe the atmospheric phenomenon that results in this extreme spectral change in light environment. Reflectance spectroscopy is used to characterize the photonic nanostructure that generates the reflective region of the tapetum lucidum behind the retina. A model is proposed to explain the reversible reformatting of the reflector by seasonal changes in the volume of interstitial fluid within the two-dimensional photonic crystal of parallel collagen fibrils. This model is tested by allowing slow evaporation of the fluid from both summer and winter tapetum surfaces while monitoring changes in the reflectance spectrum. Coupled variations in the spacing and the degree of order of the fibril packing can transform the typical gold-turquoise colour of such a tapetal reflector to a deep blue that matches the peak spectral irradiance of twilight. The mechanism we describe might be applied by other animals with similar tapeta that experience prolonged changes in light environment.
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Affiliation(s)
- Robert A. E. Fosbury
- Institute of Ophthalmology, University College London, 11–43 Bath Street, London EC1V 9EL, UK,European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany
| | - Glen Jeffery
- Institute of Ophthalmology, University College London, 11–43 Bath Street, London EC1V 9EL, UK
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Hoeven JESVD, Shneidman AV, Nicolas NJ, Aizenberg J. Evaporation-Induced Self-Assembly of Metal Oxide Inverse Opals: From Synthesis to Applications. Acc Chem Res 2022; 55:1809-1820. [PMID: 35700186 PMCID: PMC9260962 DOI: 10.1021/acs.accounts.2c00087] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
![]()
Inverse opals (IOs) are highly interconnected three-dimensional
macroporous structures with applications in a variety of disciplines
from optics to catalysis. For instance, when the pore size is on the
scale of the wavelength of visible light, IOs exhibit structural color
due to diffraction and interference of light rather than due to absorption
by pigments, making these structures valuable as nonfading paints
and colorants. When IO pores are in an ordered arrangement, the IO
is a 3D photonic crystal, a structure with a plethora of interesting
optical properties that can be used in a multitude of applications,
from sensors to lasers. IOs also have interesting fluidic properties
that arise from the re-entrant geometry of the pores, making them
excellent candidates for colorimetric sensors based on fluid surface
tension. Metal oxide IOs, in particular, can also be photo- and thermally
catalytically active due to the catalytic activity of the background
matrix material or of functional nanoparticles embedded within the
structure. Evaporation-induced self-assembly of sacrificial
particles has
been developed as a scalable method for forming IOs. The pore size
and shape, surface chemistry, matrix material, and the macroscopic
shape of the IO, as well as the inclusion of functional components,
can be designed through the choice of deposition conditions such as
temperature and humidity, types and concentrations of components in
the self-assembly mixture, and the postassembly processing. These
parameters allow researchers to tune the optical, mechanical, and
thermal transport properties of IOs for optimum functionality. In this Account, we focus on experimental and
theoretical studies to understand the self-assembly process and properties
of metal oxide IOs without (bare) and with (hybrid) plasmonic or catalytic
metal nanoparticles incorporated. Several synthetic approaches are
first presented, together with a discussion of the various forces
involved in the assembly process. The visualization of the deposition
front with time-lapse microscopy is then discussed together with analytical
theory and numerical simulations to determine the conditions needed
for the deposition of a continuous IO film. Subsequently, we present
high-resolution scanning electron microscopy (SEM) of assembled colloids
over large areas, which provides a detailed view of the evolution
of the assembly process, showing that the organization of the colloids
is initially dictated by the meniscus of the evaporating suspension
on the substrate, but that gradually all grains rotate to occupy the
thermodynamically most favorable orientation. High-resolution 3D transmission
electron microscopy (TEM) is then presented together with analysis
of the wetting of the templating colloids by the matrix precursor
to provide a detailed picture of the embedding of metallic nanoparticles
at the pore–matrix interface. Finally, the resulting properties
and applications in optics, wetting, and catalysis are discussed,
concluding with an outlook on the future of self-assembled metal-oxide-based
IOs.
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Affiliation(s)
- Jessi E S van der Hoeven
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.,Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States.,Materials Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Anna V Shneidman
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Natalie J Nicolas
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Joanna Aizenberg
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.,Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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van de Kerkhof GT, Schertel L, Catòn L, Parton TG, Müller KH, Greer HF, Ingham CJ, Vignolini S. Polysaccharide metabolism regulates structural colour in bacterial colonies. J R Soc Interface 2022; 19:20220181. [PMID: 35611622 PMCID: PMC9131120 DOI: 10.1098/rsif.2022.0181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 04/13/2022] [Indexed: 12/17/2022] Open
Abstract
The brightest colours in nature often originate from the interaction of light with materials structured at the nanoscale. Different organisms produce such coloration with a wide variety of materials and architectures. In the case of bacterial colonies, structural colours stem for the periodic organization of the cells within the colony, and while considerable efforts have been spent on elucidating the mechanisms responsible for such coloration, the biochemical processes determining the development of this effect have not been explored. Here, we study the influence of nutrients on the organization of cells from the structurally coloured bacteria Flavobacterium strain IR1. By analysing the optical properties of the colonies grown with and without specific polysaccharides, we found that the highly ordered organization of the cells can be altered by the presence of fucoidans. Additionally, by comparing the organization of the wild-type strain with mutants grown in different nutrient conditions, we deduced that this regulation of cell ordering is linked to a specific region of the IR1 chromosome. This region encodes a mechanism for the uptake and metabolism of polysaccharides, including a polysaccharide utilization locus (PUL operon) that appears specific to fucoidan, providing new insight into the biochemical pathways regulating structural colour in bacteria.
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Affiliation(s)
- Gea T. van de Kerkhof
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Lukas Schertel
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Laura Catòn
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
- Hoekmine BV, Room 1.091 (iLab), Kenniscentrum Technologie en Innovatie, Hogeschool Utrecht, Heidelberglaan 7, 3584 CS, Utrecht, The Netherlands
| | - Thomas G. Parton
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Karin H. Müller
- Cambridge Advanced Imaging Centre, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK
| | - Heather F. Greer
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Colin J. Ingham
- Hoekmine BV, Room 1.091 (iLab), Kenniscentrum Technologie en Innovatie, Hogeschool Utrecht, Heidelberglaan 7, 3584 CS, Utrecht, The Netherlands
| | - Silvia Vignolini
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
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11
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Belén F, Gravina AN, Pistonesi MF, Ruso JM, García NA, Prado FD, Messina PV. NIR-Reflective and Hydrophobic Bio-Inspired Nano-Holed Configurations on Titanium Alloy. ACS APPLIED MATERIALS & INTERFACES 2022; 14:5843-5855. [PMID: 35048694 DOI: 10.1021/acsami.1c22557] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Near-infrared (NIR) radiation plays an important role in guided external stimulus therapies; its application in bone-related treatments is becoming more and more frequent. Therefore, metallic biomaterials that exhibit properties activated by NIR are promising for further orthopedic procedures. In this work, we present an adapted electroforming approach to attain a biomorphic nano-holed TiO2 coating on Ti6Al4V alloy. Through a precise control of the anodization conditions, structures revealed the formation of localized nano-pores arranged in a periodic assembly. This specific organization provoked higher stability against thermal oxidation and precise hydrophobic wettability behavior according to Cassie-Baxter's model; both characteristics are a prerequisite to ensure a favorable biological response in an implantable structure for guided bone regeneration. In addition, the periodically arranged sub-wavelength-sized unit cell on the metallic-dielectric structure exhibits a peculiar optical response, which results in higher NIR reflectivity. Accordingly, we have proved that this effect enhances the efficiency of the scattering processes and provokes a significant improvement of light confinement producing a spontaneous NIR fluorescence emission. The combination of the already favorable mechanical and biocompatibility properties of Ti6Al4V, along with suitable thermal stability, wetting, and electro-optical behavior, opens a promising path toward strategic bone therapeutic procedures.
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Affiliation(s)
- Federico Belén
- INQUISUR─CONICET, Department of Chemistry, Universidad Nacional del Sur, CPB B8000 Bahía Blanca, Argentina
| | - A Noel Gravina
- INQUISUR─CONICET, Department of Chemistry, Universidad Nacional del Sur, CPB B8000 Bahía Blanca, Argentina
| | - Marcelo Fabián Pistonesi
- INQUISUR─CONICET, Department of Chemistry, Universidad Nacional del Sur, CPB B8000 Bahía Blanca, Argentina
| | - Juan M Ruso
- Soft Matter and Molecular Biophysics Group, Department of Applied Physics, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Nicolás A García
- IFISUR─CONICET, Department of Physics, Universidad Nacional del Sur, CPB B8000 Bahía Blanca, Argentina
| | - Fernando Daniel Prado
- IFISUR─CONICET, Department of Physics, Universidad Nacional del Sur, CPB B8000 Bahía Blanca, Argentina
| | - Paula V Messina
- INQUISUR─CONICET, Department of Chemistry, Universidad Nacional del Sur, CPB B8000 Bahía Blanca, Argentina
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Bazzano LT, Mendicino LR, Inchaussandague ME, Skigin DC, García NC, Tubaro PL, Barreira AS. Mechanisms involved in the production of differently colored feathers in the structurally colored swallow tanager (Tersina viridis; Aves: Thraupidae). JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION 2021; 336:404-416. [PMID: 33988912 DOI: 10.1002/jez.b.23043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 02/23/2021] [Accepted: 03/09/2021] [Indexed: 11/06/2022]
Abstract
Non-iridescent, structural coloration in birds originates from the feather's internal nanostructure (the spongy matrix) but melanin pigments and the barb's cortex can affect the resulting color. Here, we explore how this nanostructure is combined with other elements in differently colored plumage patches within a bird. We investigated the association between light reflectance and the morphology of feathers from the back and belly plumage patches of male swallow tanagers (Tersina viridis), which look greenish-blue and white, respectively. Both plumage patches have a reflectance peak around 550 nm but the reflectance spectrum is much less saturated in the belly. The barbs of both types of feathers have similar spongy matrices at their tips, rendering their reflectance spectra alike. However, the color of the belly feather barbs changes from light green at their tips to white closer to the rachis. These barbs lack pigments and their morphology changes considerably throughout. Toward the rachis, the barb is almost hollow, with a reduced area occupied by spongy matrix, and has a flattened shape. By contrast, the blue back feathers' barbs have melanin underneath the spongy matrix resulting in a much more saturated coloration. The color of these barbs is also even along the barbs' length. Our results suggest that the color differences between the white and greenish-blue plumage are mostly due to the differential deposition of melanin and a reduction of the spongy matrix near the rachis of the belly feather barbs and not a result of changes in the characteristics of the spongy matrix.
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Affiliation(s)
- Lisandro T Bazzano
- Grupo de Electromagnetismo Aplicado, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
| | - Lucas R Mendicino
- Grupo de Electromagnetismo Aplicado, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
| | - Marina E Inchaussandague
- Grupo de Electromagnetismo Aplicado, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.,Instituto de Física de Buenos Aires (IFIBA)-CONICET, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
| | - Diana C Skigin
- Grupo de Electromagnetismo Aplicado, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.,Instituto de Física de Buenos Aires (IFIBA)-CONICET, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
| | - Natalia C García
- División Ornitología, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"-CONICET, Ciudad Autónoma de Buenos Aires, Argentina.,Fuller Evolutionary Program, Cornell Lab of Ornithology, Cornell University, Ithaca, New York, USA
| | - Pablo L Tubaro
- División Ornitología, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"-CONICET, Ciudad Autónoma de Buenos Aires, Argentina
| | - Ana S Barreira
- División Ornitología, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"-CONICET, Ciudad Autónoma de Buenos Aires, Argentina
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