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Title: Final Analysis: Porous Platinum Morphologies: Platinised, Sponge and Black
Authors: Mills, Allan
First Published: 1-Jan-2007
Publisher: Johnson Matthey
Citation: Platinum Metals Review, Volume 51, Number 1, January 2007, pp. 52-52(1)
Abstract: First paragraph: Platinum (as well as many other metals) may be prepared in finely divided forms that are porous at all levels of magnification. Cracks and crevices in the sponge-like opaque matrix then allow visible light (of wavelength around 0.5 μm) to enter, whereupon it undergoes multiple reflections and is unlikely to be reflected back out. This effectively produces a high value for optical absorption, resulting in a velvety black appearance to the eye, even though the platinum is in the metallic state. Other porous structures (such as snow and plaster) consist of inherently transparent or translucent crystals, so light can be refracted as well as reflected out and they appear matt white.
DOI Link: 10.1595/147106707X176210
ISSN: 0032-1400
eISSN: 1471-0676
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. CC BY-NC-ND 4.0
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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