Morphology and radiative properties of sol-gel nanocomposite coatings in electronics cooling applications

摘要

Coatings composed of mixed nanoparticles in Silica and Titania sol matrices were prepared by sol-gel spray coating method. The coatings were characterized using scanning electron microscopy (SEM), FT-IR spectroscopy and Infrared thermal imaging. The thermal Infrared Emissivity of the coatings was determined using IR-1 spectrometer. The coating solutions were applied onto sand blasted aluminum substrates. Results indicated that mixed nanoparticles can be well dispersed in sol to give coatings with good heat emission properties. High emissivity of 0.915-0.941 was achieved, and the coatings showed cooling efficiency of 7.3-14%. The coatings can be prepared in an easy and controlled way using sol-gel method and are a potential in radiative cooling applications.