The radiative properties of most structures are intimately connected to theway in which their constituents are ordered on the nano-scale. We have proposeda new representation for radiative heat transfer formalism in many-bodysystems. In this representation, we explain why collective effects depend onthe morphology of structures, and how the arrangement of nanoparticles andtheir material affects the thermal properties in many-body systems. Weinvestigated the radiative heat transfer problem in fractal (i.e., scaleinvariant) structures. In order to show the effect of the structure morphologyon the collective properties, the radiative heat transfer and radiative coolingare studied and the results are compared for fractal and non-fractalstructures. It is shown that fractal arranged nanoparticles display complexradiative behavior related to their scaling properties. we showed that, incontrast to non-fractal structures, heat flux in fractals is not of large-rangecharacter. By using the fractal dimension as a means to describe the structuremorphology, we present a universal scaling behavior that quantitatively linksthe structure radiative cooling to the structure gyration radius.
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