Colloidal metal in aluminum-oxide
- 1 May 1978
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 49 (5) , 2929-2934
- https://doi.org/10.1063/1.325153
Abstract
The nature of the origin of the color in anodized aluminum colored by ac electrolysis in electrolytes containing nickel, copper, silver, gold, and molybdenum salts is investigated. The measured specular reflectance spectra in the region 350–750 nm can be adequately explained by assuming that small metallic particles are incorporated in the anodic film as a colloid. By calculating the optical constants of such a system, specular reflectance spectra can be deduced. A detailed comparison of the calculated and experimental reflectance spectra yields good agreement. It is concluded that metals which do not possess interband transitions or plasma resonance absorptions in or near the visible region of the spectrum will produce brown or bronze colored anodic films when incorporated as a colloid.This publication has 8 references indexed in Scilit:
- Influence of surface roughness on the transmission and reflectance spectra of adsorbed speciesJournal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1973
- Optical Absorption of Small Silver Spheres in WaterJournal of Applied Physics, 1971
- Optical Properties of Thin Metallic Films in Island FormJournal of Applied Physics, 1966
- An efficient method for finding the minimum of a function of several variables without calculating derivativesThe Computer Journal, 1964
- The Optical Constants of Silver, Gold, Copper, and Aluminum I The Absorption Coefficient kJournal of the Optical Society of America, 1954
- Optical Constants of Silver, Gold, Copper, and Aluminum II The Index of Refraction nJournal of the Optical Society of America, 1954
- Structural Features of Oxide Coatings on AluminumJournal of the Electrochemical Society, 1953
- XII. Colours in metal glasses and in metallic filmsPhilosophical Transactions of the Royal Society A, 1904