The color of finely dispersed nanoparticles |
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Authors: | M Quinten |
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Institution: | (1) Mauritiusstrasse 7, 52457 Aldenhoven, Germany, DE |
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Abstract: | We discuss the dependence of the color of low-concentrated nanoparticle systems on particle size and mass concentration for
Ag, Au and TiN nanoparticles, which exhibit a surface plasmon polariton resonance in extinction spectra. Comparison is made
with color data obtained for Ag and Au colloidal suspensions.
When particles lump into aggregates, the splitting of the surface plasmon resonance into new resonances affects the extinction
of light and, hence, the color of the particle assembly. This is demonstrated for aggregated colloidal suspensions of Ag and
Au nanoparticles.
Finally, for highly concentrated assemblies such as pigment films, we discuss the dependence of the color in diffuse reflectance
and transmittance according to Kubelka and Munk (P. Kubelka, F. Munk: Z. Techn. Phys. 12, 593 (1931)), and extend this model by using optical properties of aggregates of spheres.
Received: 2 July 2001 / Published online: 10 October 2001 |
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Keywords: | PACS: 78 40 -q 78 66 Vs 82 70 -y 82 80 Ch |
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