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Structurally Coloured Secondary Particles Composed of Black and White Colloidal Particles

This study investigated the colourful secondary particles formed by controlling the aggregation states of colloidal silica particles and the enhancement of the structural colouration of the secondary particles caused by adding black particles. We obtained glossy, partially structurally coloured seco...

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Autores principales: Takeoka, Yukikazu, Yoshioka, Shinya, Teshima, Midori, Takano, Atsushi, Harun-Ur-Rashid, Mohammad, Seki, Takahiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3734480/
https://www.ncbi.nlm.nih.gov/pubmed/23917891
http://dx.doi.org/10.1038/srep02371
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author Takeoka, Yukikazu
Yoshioka, Shinya
Teshima, Midori
Takano, Atsushi
Harun-Ur-Rashid, Mohammad
Seki, Takahiro
author_facet Takeoka, Yukikazu
Yoshioka, Shinya
Teshima, Midori
Takano, Atsushi
Harun-Ur-Rashid, Mohammad
Seki, Takahiro
author_sort Takeoka, Yukikazu
collection PubMed
description This study investigated the colourful secondary particles formed by controlling the aggregation states of colloidal silica particles and the enhancement of the structural colouration of the secondary particles caused by adding black particles. We obtained glossy, partially structurally coloured secondary particles in the absence of NaCl, but matte, whitish secondary particles were obtained in the presence of NaCl. When a small amount of carbon black was incorporated into both types of secondary particles, the incoherent multiple scattering of light from the amorphous region was considerably reduced. However, the peak intensities in the reflection spectra, caused by Bragg reflection and by coherent single wavelength scattering, were only slightly decreased. Consequently, a brighter structural colour of these secondary particles was observed with the naked eye. Furthermore, when magnetite was added as a black particle, the coloured secondary particles could be moved and collected by applying an external magnetic field.
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spelling pubmed-37344802013-08-06 Structurally Coloured Secondary Particles Composed of Black and White Colloidal Particles Takeoka, Yukikazu Yoshioka, Shinya Teshima, Midori Takano, Atsushi Harun-Ur-Rashid, Mohammad Seki, Takahiro Sci Rep Article This study investigated the colourful secondary particles formed by controlling the aggregation states of colloidal silica particles and the enhancement of the structural colouration of the secondary particles caused by adding black particles. We obtained glossy, partially structurally coloured secondary particles in the absence of NaCl, but matte, whitish secondary particles were obtained in the presence of NaCl. When a small amount of carbon black was incorporated into both types of secondary particles, the incoherent multiple scattering of light from the amorphous region was considerably reduced. However, the peak intensities in the reflection spectra, caused by Bragg reflection and by coherent single wavelength scattering, were only slightly decreased. Consequently, a brighter structural colour of these secondary particles was observed with the naked eye. Furthermore, when magnetite was added as a black particle, the coloured secondary particles could be moved and collected by applying an external magnetic field. Nature Publishing Group 2013-08-06 /pmc/articles/PMC3734480/ /pubmed/23917891 http://dx.doi.org/10.1038/srep02371 Text en Copyright © 2013, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/3.0/ This work is licensed under a Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/
spellingShingle Article
Takeoka, Yukikazu
Yoshioka, Shinya
Teshima, Midori
Takano, Atsushi
Harun-Ur-Rashid, Mohammad
Seki, Takahiro
Structurally Coloured Secondary Particles Composed of Black and White Colloidal Particles
title Structurally Coloured Secondary Particles Composed of Black and White Colloidal Particles
title_full Structurally Coloured Secondary Particles Composed of Black and White Colloidal Particles
title_fullStr Structurally Coloured Secondary Particles Composed of Black and White Colloidal Particles
title_full_unstemmed Structurally Coloured Secondary Particles Composed of Black and White Colloidal Particles
title_short Structurally Coloured Secondary Particles Composed of Black and White Colloidal Particles
title_sort structurally coloured secondary particles composed of black and white colloidal particles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3734480/
https://www.ncbi.nlm.nih.gov/pubmed/23917891
http://dx.doi.org/10.1038/srep02371
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