Radiative properties of spectral selective coatings pigmented with TiO2nanoparticles

Abstract

This study is concerned with nanoparticle-pigmented coatings used to control the radiative properties of surfaces exposed to sunlight. The desired coatings increase the near infrared reflectance while decreasing the reflectance of visible light. Both experimental and numerical approaches were followed in achieving the desired spectral behavior. In this study the pigmented coatings were made using TiO2 as dispersed particles, clear acryl synthetic as the matrix, and standard black paper as the substrate. The spectral reflectance was measured by spectroscopy in the visible and near-infrared regions. The effects of the size distribution and volume fraction of pigment particles and the coating thickness on the spectral reflectance of pigmented coatings are examined in this study. © 2011 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.20392