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Determining Pigment Optical Properties for Use in the Mie and Many‐Flux Theories
Author(s) -
Billmeyer Fred W.,
Chassaigne Patrick G.,
Dubois Jean F.
Publication year - 1980
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1002/col.5080050213
Subject(s) - legendre polynomials , mie scattering , refractive index , scattering , pigment , absorption (acoustics) , flux (metallurgy) , optics , light scattering , dispersion (optics) , reflectivity , materials science , series (stratigraphy) , molar absorptivity , chemistry , physics , quantum mechanics , organic chemistry , paleontology , metallurgy , biology
Normalized phase functions p (ϑ), the angular dependence of light scattering, were determined experimentally for diluted aqueous dispersions of iron‐oxide pigments. The best means of representing p (ϑ) through a series of Legendre polynomials was studied. From the Legendre coefficients it was possible to calculate by the Mie theory both the complex refractive index of the pigment and the single‐scattering absorption and scattering coefficients. The latter coefficients were used in the many‐flux theory to calculate the reflectance of a paint film made from the pigment. Reasonable agreement was obtained with the experimental value of reflectance of a paint film prepared from the same, but undiluted, dispersion.