Turbidimetric Evaluation of the Dispersion Properties of Disperse Dyes

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Abstract
The dispersion of disperse dyes is examined by two turbidity measurements. Each dispersion of C.I. Disperse Blue 56 and C.I. Disperse Yellow 54 is prepared by a milling process. The complex refractive index can describe the turbidity of dye dispersion by applying Mie's theory. The turbidity ratio—the ratio of the turbidity at the maximum absorption wavelength to that at 850 nm—is theoretically calculated and experimentally measured. Dye particle size gradually decreases with milling time. The turbidity ratio of the dispersion of disperse dyes increases with decreasing geometric mean radius, and shows more noticeable dependence on the mean radius of the particles than the turbidity. Dye dispersion properties are evaluated in terms of the geometric mean radius by the turbidity ratio.