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Sol–gel Al2O3 powders—matrix in solar thermal absorbers

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Abstract

Porous alumina powders for solar thermal applications, prepared by sol–gel were comparatively investigated, starting from an organo-metallic precursor (aluminum isopropoxide) and an inorganic precursor (aluminum chloride hexahydrate). As morphology controlling agents, HCl and poly (ethylene glycol) were added in the precursor solutions. X-Ray Diffraction, Atomic Force Microscopy, Differential Scanning Calorimetry, Fourier Transform Infrared Spectra and UV–VIS-NIR spectroscopy were used to characterize the materials. The chemical composition, the phase structure and morphological properties are influenced by the additive type and by the heat treatment temperature. The results shows that optimized conditions lead to high quality matrix for solar-thermal absorbers, with absorptance in the visible region varying from 0.13 to 0.47 and low thermal emittance (εT = 0.02–0.09) in the infrared region of the solar spectrum.

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Acknowledgments

This paper is supported by the Sectoral Operational Programme Human Resources Development (SOP HRD), ID76945 financed from the European Social Fund and by the Romanian Government.

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Authors and Affiliations

  1. RTD Centre Renewable Energy Systems and Recycling, Transilvania University of Brasov, Romania, Eroilor 29, 500036, Brasov, Romania

    Claudia Andreea Milea, Elena Ienei, Cristina Bogatu & Anca Duţã

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  1. Claudia Andreea Milea
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  2. Elena Ienei
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  3. Cristina Bogatu
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  4. Anca Duţã
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Correspondence to Anca Duţã.

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Milea, C.A., Ienei, E., Bogatu, C. et al. Sol–gel Al2O3 powders—matrix in solar thermal absorbers. J Sol-Gel Sci Technol 67, 112–120 (2013). https://doi.org/10.1007/s10971-013-3056-z

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  • DOI: https://doi.org/10.1007/s10971-013-3056-z

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