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Final Analysis: Porous Platinum Morphologies: Platinised, Sponge and Black

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journal contribution
posted on 14.04.2016, 09:09 by Allan Mills
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.

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Citation

Platinum Metals Review, Volume 51, Number 1, January 2007, pp. 52-52(1)

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VoR (Version of Record)

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Platinum Metals Review

Publisher

Johnson Matthey

issn

0032-1400

eissn

1471-0676

Available date

14/04/2016

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http://www.ingentaconnect.com/content/matthey/pmr/2007/00000051/00000001/art00013?token=004510515c5f3b3b474673487834247b5179755f7a4f582a2f433e402c3568263c2bc

Language

en

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