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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/035/06/0997-1002

    • Keywords

       

      Spray pyrolysis deposition; surface engineering; solar selective coatings.

    • Abstract

       

      Solar selective coatings for solar thermal flat-plate collectors consisting of crystalline copper oxides and amorphous nickel oxide composites were obtained by robotic spray pyrolyzed deposition. The parameters were optimized for increased spectral selectivity (𝑆): high solar absorptance and low thermal emittance. The coatings were deposited using nickel and copper acetate, dissolved in mixed solvents with various water: ethanol ratios. The coatings’ properties were characterized in terms of crystalline composition (XRD), surface morphology (AFM, contact angle) and optical properties (solar absorptance, thermal emittance and spectral selectivity). Considering the precursor solutions composition (solvent, wetting behaviour), the growth processes were modelled for two different systems: predominant hydrophilic and predominant hydrophobic. The high selectivity values (𝑆 > 30) of the optimized composite coatings were explained based on two parallel mechanisms: intrinsic absorption and multiple reflections generated when absorbers with controlled roughness are deposited.

    • Author Affiliations

       

      Mihaela Dudita1 Luminita Isac1 Anca Duta1

      1. Renewable Energy Systems and Recycling Department, Transilvania University of Brasov, Eroilor 29, 500 036 Brasov, Romania

    • Dates

       
      Published
      November 2012
      Manuscript received
      9 September 2011
      Manuscript revised
      10 January 2012

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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