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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/2993

Title: Carbon-in-silica composite selective solar absorbers: a determination of composition and dielectic properties - SAIP Poster
Authors: Katumba, G
Baisitse, T
Forbes, A
Olumekor, L
Wackelgard, E
Keywords: Solar absorbers
Reflectance
Composite coating
Carbon nano-chains
Films thickness
Carbon volume
Percolation thresholds
Issue Date: Jul-2006
Citation: Katumba, G, Baisitse, T, Forbes, A et al. 2006. Carbon-in-silica composite selective solar absorbers: a determination of composition and dielectic properties. 51st Annual Conference of the SAIP, University of the Western Cape, South Africa, 3-7 July 2006, pp 1
Abstract: The Bruggeman and Maxwell-Garnett effective medium approximations (EMAs) have been used to investigate optical properties of composite materials. The EMA assumptions are based on random unit cell models in which metal particles are embedded in a dielectric medium. The embedded particles can be varied between spherical, ellipsoidal and cylindrical shapes. An interesting structure of connected short chains of amorphous carbon intermixed with silica chains at nanoscale level has been observed. The Bruggeman and Maxwell-Garnett EMAs could not model the optical properties of these materials; neither could the Bergman-Milton bounds approach. A generalised Bergman representation is applied on these carbon-in-silica samples with successful fitting between experiment and theory. The curve-fitting procedure resulted in information such as volume fraction of carbon relative to silica, percolation threshold and film thickness
Description: 51st Annual Conference of the SAIP, University of the Western Cape, South Africa, 3-7 July 2006
URI: http://hdl.handle.net/10204/2993
Appears in Collections:General science, engineering & technology

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