Origin of solar thermal selectivity and interference effects in nickel–alumina nanostructured films

Selective surfaces for solar to thermal conversion were studied for understanding the main parameters affecting selectivity. For this purpose samples of Ni inclusions into nanoporous anodized aluminum were electrochemically prepared. Their optical reflectance from 200 nm to 17 μm was measured showin...

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Bibliographic Details
Published in:Surface & coatings technology 2010-04, Vol.204 (14), p.2197-2201
Main Authors: Galione, P.A., Baroni, A.L., Ramos-Barrado, J.R., Leinen, D., Martín, F., Marotti, R.E., Dalchiele, E.A.
Format: Article
Language:English
Subjects:
Aluminum oxide template
Applied sciences
Cross-disciplinary physics: materials science
rheology
Electrodeposition
Exact sciences and technology
Materials science
Metallic coatings
Metals. Metallurgy
Nickel
Optical response
Physics
Production techniques
Reflectance
Solar energy
Surface treatment
Surface treatments
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Summary:Selective surfaces for solar to thermal conversion were studied for understanding the main parameters affecting selectivity. For this purpose samples of Ni inclusions into nanoporous anodized aluminum were electrochemically prepared. Their optical reflectance from 200 nm to 17 μm was measured showing a step-like behavior and several interference fringes. Different models were used to interpret this behavior varying several of the involved parameters. The composition of Ni/alumina film is the first cause for selectivity. Interference effects occurring in this film strengthen the step-like behavior of the reflectance spectra and therefore, the selectivity.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2009.12.008