Visual Appearance

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Silvia Vignolini - One of the best experts on this subject based on the ideXlab platform.

  • Visual Appearance of chiral nematic cellulose based photonic films angular and polarization independent color response with a twist
    Advanced Materials, 2019
    Co-Authors: Chun Lam Clement Chan, Richard M Parker, Cyan Williams, Bruno Frkapetesic, Gianni Jacucci, Roberto Vadrucci, Gea T Van De Kerkhof, Kevin Vynck, Silvia Vignolini
    Abstract:

    : Hydroxypropyl cellulose (HPC) is a biocompatible cellulose derivative capable of self-assembling into a lyotropic chiral nematic phase in aqueous solution. This liquid crystalline phase reflects right-handed circular polarized light of a specific color as a function of the HPC weight fraction. Here, it is demonstrated that, by introducing a crosslinking agent, it is possible to drastically alter the Visual Appearance of the HPC mesophase in terms of the reflected color, the scattering distribution, and the polarization response, resulting in an exceptional matte Appearance in solid-state films. By exploiting the interplay between order and disorder, a robust and simple methodology toward the preparation of polarization and angular independent color is developed, which constitutes an important step toward the development of real-world photonic colorants.

  • the self assembly of cellulose nanocrystals hierarchical design of Visual Appearance
    Advanced Materials, 2018
    Co-Authors: Richard M Parker, Giulia Guidetti, Cyan Williams, Tianheng Zhao, Aurimas Narkevicius, Silvia Vignolini, Bruno Frkapetesic
    Abstract:

    By controlling the interaction of biological building blocks at the nanoscale, natural photonic nanostructures have been optimized to produce intense coloration. Inspired by such biological nanostructures, the possibility to design the Visual Appearance of a material by guiding the hierarchical self-assembly of its constituent components, ideally using natural materials, is an attractive route for rationally designed, sustainable manufacturing. Within the large variety of biological building blocks, cellulose nanocrystals are one of the most promising biosourced materials, primarily for their abundance, biocompatibility, and ability to readily organize into photonic structures. Here, the mechanisms underlying the formation of iridescent, vividly colored materials from colloidal liquid crystal suspensions of cellulose nanocrystals are reviewed and recent advances in structural control over the hierarchical assembly process are reported as a toolbox for the design of sophisticated optical materials.

Bruno Frkapetesic - One of the best experts on this subject based on the ideXlab platform.

  • Visual Appearance of chiral nematic cellulose based photonic films angular and polarization independent color response with a twist
    Advanced Materials, 2019
    Co-Authors: Chun Lam Clement Chan, Richard M Parker, Cyan Williams, Bruno Frkapetesic, Gianni Jacucci, Roberto Vadrucci, Gea T Van De Kerkhof, Kevin Vynck, Silvia Vignolini
    Abstract:

    : Hydroxypropyl cellulose (HPC) is a biocompatible cellulose derivative capable of self-assembling into a lyotropic chiral nematic phase in aqueous solution. This liquid crystalline phase reflects right-handed circular polarized light of a specific color as a function of the HPC weight fraction. Here, it is demonstrated that, by introducing a crosslinking agent, it is possible to drastically alter the Visual Appearance of the HPC mesophase in terms of the reflected color, the scattering distribution, and the polarization response, resulting in an exceptional matte Appearance in solid-state films. By exploiting the interplay between order and disorder, a robust and simple methodology toward the preparation of polarization and angular independent color is developed, which constitutes an important step toward the development of real-world photonic colorants.

  • the self assembly of cellulose nanocrystals hierarchical design of Visual Appearance
    Advanced Materials, 2018
    Co-Authors: Richard M Parker, Giulia Guidetti, Cyan Williams, Tianheng Zhao, Aurimas Narkevicius, Silvia Vignolini, Bruno Frkapetesic
    Abstract:

    By controlling the interaction of biological building blocks at the nanoscale, natural photonic nanostructures have been optimized to produce intense coloration. Inspired by such biological nanostructures, the possibility to design the Visual Appearance of a material by guiding the hierarchical self-assembly of its constituent components, ideally using natural materials, is an attractive route for rationally designed, sustainable manufacturing. Within the large variety of biological building blocks, cellulose nanocrystals are one of the most promising biosourced materials, primarily for their abundance, biocompatibility, and ability to readily organize into photonic structures. Here, the mechanisms underlying the formation of iridescent, vividly colored materials from colloidal liquid crystal suspensions of cellulose nanocrystals are reviewed and recent advances in structural control over the hierarchical assembly process are reported as a toolbox for the design of sophisticated optical materials.

Richard M Parker - One of the best experts on this subject based on the ideXlab platform.

  • Visual Appearance of chiral nematic cellulose based photonic films angular and polarization independent color response with a twist
    Advanced Materials, 2019
    Co-Authors: Chun Lam Clement Chan, Richard M Parker, Cyan Williams, Bruno Frkapetesic, Gianni Jacucci, Roberto Vadrucci, Gea T Van De Kerkhof, Kevin Vynck, Silvia Vignolini
    Abstract:

    : Hydroxypropyl cellulose (HPC) is a biocompatible cellulose derivative capable of self-assembling into a lyotropic chiral nematic phase in aqueous solution. This liquid crystalline phase reflects right-handed circular polarized light of a specific color as a function of the HPC weight fraction. Here, it is demonstrated that, by introducing a crosslinking agent, it is possible to drastically alter the Visual Appearance of the HPC mesophase in terms of the reflected color, the scattering distribution, and the polarization response, resulting in an exceptional matte Appearance in solid-state films. By exploiting the interplay between order and disorder, a robust and simple methodology toward the preparation of polarization and angular independent color is developed, which constitutes an important step toward the development of real-world photonic colorants.

  • the self assembly of cellulose nanocrystals hierarchical design of Visual Appearance
    Advanced Materials, 2018
    Co-Authors: Richard M Parker, Giulia Guidetti, Cyan Williams, Tianheng Zhao, Aurimas Narkevicius, Silvia Vignolini, Bruno Frkapetesic
    Abstract:

    By controlling the interaction of biological building blocks at the nanoscale, natural photonic nanostructures have been optimized to produce intense coloration. Inspired by such biological nanostructures, the possibility to design the Visual Appearance of a material by guiding the hierarchical self-assembly of its constituent components, ideally using natural materials, is an attractive route for rationally designed, sustainable manufacturing. Within the large variety of biological building blocks, cellulose nanocrystals are one of the most promising biosourced materials, primarily for their abundance, biocompatibility, and ability to readily organize into photonic structures. Here, the mechanisms underlying the formation of iridescent, vividly colored materials from colloidal liquid crystal suspensions of cellulose nanocrystals are reviewed and recent advances in structural control over the hierarchical assembly process are reported as a toolbox for the design of sophisticated optical materials.

Cyan Williams - One of the best experts on this subject based on the ideXlab platform.

  • Visual Appearance of chiral nematic cellulose based photonic films angular and polarization independent color response with a twist
    Advanced Materials, 2019
    Co-Authors: Chun Lam Clement Chan, Richard M Parker, Cyan Williams, Bruno Frkapetesic, Gianni Jacucci, Roberto Vadrucci, Gea T Van De Kerkhof, Kevin Vynck, Silvia Vignolini
    Abstract:

    : Hydroxypropyl cellulose (HPC) is a biocompatible cellulose derivative capable of self-assembling into a lyotropic chiral nematic phase in aqueous solution. This liquid crystalline phase reflects right-handed circular polarized light of a specific color as a function of the HPC weight fraction. Here, it is demonstrated that, by introducing a crosslinking agent, it is possible to drastically alter the Visual Appearance of the HPC mesophase in terms of the reflected color, the scattering distribution, and the polarization response, resulting in an exceptional matte Appearance in solid-state films. By exploiting the interplay between order and disorder, a robust and simple methodology toward the preparation of polarization and angular independent color is developed, which constitutes an important step toward the development of real-world photonic colorants.

  • the self assembly of cellulose nanocrystals hierarchical design of Visual Appearance
    Advanced Materials, 2018
    Co-Authors: Richard M Parker, Giulia Guidetti, Cyan Williams, Tianheng Zhao, Aurimas Narkevicius, Silvia Vignolini, Bruno Frkapetesic
    Abstract:

    By controlling the interaction of biological building blocks at the nanoscale, natural photonic nanostructures have been optimized to produce intense coloration. Inspired by such biological nanostructures, the possibility to design the Visual Appearance of a material by guiding the hierarchical self-assembly of its constituent components, ideally using natural materials, is an attractive route for rationally designed, sustainable manufacturing. Within the large variety of biological building blocks, cellulose nanocrystals are one of the most promising biosourced materials, primarily for their abundance, biocompatibility, and ability to readily organize into photonic structures. Here, the mechanisms underlying the formation of iridescent, vividly colored materials from colloidal liquid crystal suspensions of cellulose nanocrystals are reviewed and recent advances in structural control over the hierarchical assembly process are reported as a toolbox for the design of sophisticated optical materials.

David Ganz - One of the best experts on this subject based on the ideXlab platform.

  • does substrate colour affect the Visual Appearance of gilded medieval sculptures part ii sem edx observations on gold leaf samples taken from medieval wooden sculptures
    Heritage Science, 2020
    Co-Authors: M Dobeli, Tiziana Lombardo, Katharina Schmidtott, Benjamin Watts, F Nolting, David Ganz
    Abstract:

    In the previous paper (Part I), the colorimetry and interferometric microscopy measurements on modern gold leaf models have revealed that the Visual Appearance of a gilded surface, both burnished and unburnished, depends strongly on the substrate type, surface roughness and texture, but not on the colour of the substrate. In this second part, we investigate the materials compositions and technical specifications of medieval gold leaf through combining literature sources and materials analysis such as scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM–EDX) on samples taken from gilded wooden sculptures. Our study shows that the late medieval gold leaf has a high purity of about 23.7 carat and has an average thickness of 160 nm (with a peak value of 138 nm), purer and thicker than the modern gold leaves studies in Part I. Supportive Rutherford backscattering spectrometry (RBS) measurements on gilded models confirms the accuracy and reliability of the SEM–EDX observations on the medieval gold leaf samples. We additionally present observations of a rarely recorded special variant of medieval gold leaf—“fine reinforced gold leaf”. Combined with the findings from Part I, we conclude that light penetrating the medieval gold leaf and reflected from the gilding substrate could not be a significant, or even perceptible contribution to the Visual Appearance of the gilding. We argue that the misconception surrounding the correlation between the substrate colour and the gilded surface Appearance can be attributed to the historical development of gilding and polychromy technologies.

  • does substrate colour affect the Visual Appearance of gilded medieval sculptures part i colorimetry and interferometric microscopy of gilded models
    Heritage Science, 2020
    Co-Authors: Meret Hauldenschild, Tiziana Lombardo, Katharina Schmidtott, Benjamin Watts, F Nolting, Benedikt Rosner, David Ganz
    Abstract:

    In the history of medieval gilding, a common view has been circulated for centuries that the substrate colour can influence the Visual Appearance of a gilded surface. In order to fully understand the correlation between the gilding substrate and the colour Appearance of the gold leaf laid above, in this paper (Part I) analytical techniques such as colorimetry and interferometric microscopy are implemented on models made from modern gold leaves. This study demonstrates that the substrate colour is not perceptible for gold leaf of at least 100 nm thickness, however the surface burnishing can greatly alter the Visual Appearance of a gold surface, and the quality of the burnishing is dependent on the substrate materials. Additionally, surface roughness and texture of the substrate can play supplementary roles, which can be Visually observed through digital microscopy and quantified through interferometric microscopy. The findings in this paper will form the basis for the study of gold leaf samples taken from medieval European gilded sculptures in Part II.