Analytical Sciences

Determination of Particle Size by Using Incidence-Angle Dependence of Spectral Intensity for Particle-Size-Measurement Method by Applying Infrared Attenuated-Total-Reflection Technique and Its Simulations by Using Algebraic-Simultaneous Equations

Toshifumi YOSHIDOME, Natsumi FUKUYAMA, Yuichiro FUKUSHIMA, and Morihide HIGO

Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan

A method using an incidence-angle dependence of the spectral intensity was proposed to determine a particle size in a particle-size measurement by applying an infrared attenuated-total-reflection (ATR) technique. A formula, which is proportional to the infrared ATR-spectral intensity, was constructed as a function of the particle size, amount of particles, and incidence angle, φ. Its φ dependences were calculated for SiO₂ particles of less than a mono layer on a Ge prism, and differed at every particle size. Some simulations of determining both particle size and particle amount were carried out for the samples of particles with sizes of 1 to 3 kinds by using algebraic-simultaneous equations with the software of Mathematica 5.2, and resulted in showing its usefulness.

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