“…In general, there are two theories describing the scattering processes of nanoparticles, i.e., the Rayleigh and Mie scattering theories. The Rayleigh scattering theory is simple and fairly accurate, and thus has been employed in the investigation of the scattering of nanoparticles [18][19][20]. It can also be employed to construct the relationship between the absorption coefficient and physical properties of nanofluids.…”