Reflectance spectroscopy from TiO2 particles embedded in polyurethane

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

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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 Sep 20135 Sep 2013


ConferenceEuropean Corrosion Congress
LocationEstoril Congress Center
Internet address

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