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Infrared emittance of medium containing nonsphere-shaped particles.

The scattering and absorption sections of cylinder- and sheet-shaped particles in a binder have been investigated. The IR emittance of a coating layer composed of randomly arrayed particles embedded in the binder has been calculated in terms of the size of the particles, the volume fraction occupied by the particles, and the complex refractive indices of the particle and the binder as well as the emittance of the substrate. The calculation shows that the inhomogeneous medium including sheet-shaped particles can have lower emittance than that including cylinder- or sphere-shaped particles.