Reflectance spectroscopy from TiO2 particles embedded in polyurethane

Visweswara Chakravarthy Gudla, Stela Canulescu, Villads Egede Johansen, Jørgen Schou, Rajan Ambat

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    Abstract

    This paper presents the results of a physical simulation carried out using TiO2-Polyurethane composite coating on bright aluminium surface to understand the light scattering effect for designing white surfaces. Polyurethane matrix is selected due to the matching refractive index (1.7) with Al2O3 layer on anodized aluminium surfaces. Three different TiO2 particle distributions were dispersed in polyurethane and spin coated onto high gloss and caustic etched aluminium substrates. Reflectance spectra of TiO2-polyurethane films of various concentrations were analysed using an integrating sphere. The results show that the TiO2-polyurethane coatings have a high diffuse reflectance as a result of multiple scattering from TiO2 particles. Diffuse reflectance spectra of TiO2 containing films vary weakly with particle concentration and reach a steady state value at a concentration of 0.75 wt.%. Using the Kubelka Munk two-stream model, the scattering and absorption coefficient of the TiO2 particles embedded in polyurethane was determined. These studies can serve on understanding the fundamental requirements for generating a bright and white decorative anodized aluminium surface.
    Original languageEnglish
    Title of host publicationProceedings of EUROCORR 2013
    Number of pages8
    PublisherEuropean Federation of Corrosion
    Publication date2013
    Publication statusPublished - 2013
    EventEuropean Corrosion Congress: Corrosion Control for a Blue Sky - Estoril Congress Center, Estoril, Portugal
    Duration: 1 Sept 20135 Sept 2013
    http://www.eurocorr2013.org/

    Conference

    ConferenceEuropean Corrosion Congress
    LocationEstoril Congress Center
    Country/TerritoryPortugal
    CityEstoril
    Period01/09/201305/09/2013
    Internet address

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