The Effects of Particle Size on the Optical Properties and Surface Roughness of a Glass-Balloon-Filled Black Paint.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIG HT CENTER
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The effects of particle size on the optical properties and surface roughness of a glass balloon filled, carbon pigmented paint were studied in order to develop a diffuse reflecting, low total reflectance, low outgassing black paint. Particle sizes ranged between 2O microns and 74 microns. Surface roughness was found to increase with increasing particle size. Relative total reflectance at near normal incidence MgO standard of the filled paints was less than for the unfilled paint between 230 nm and 1800 nm. Total absolute reflectance at 546 nm decreased with increasing particle size at grazing angles of incidence. Near normal, total emittance was greater for the filled paints than for the unfilled paint. Specularity decreased with increasing particle size over the range studied.
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