積分球式濁度計によるシリカ懸濁液の粒度分布の研究

抄録

The sedimentation rate determination is often used for the measurement of particle size distribution in a suspension, and various apparatus for measurement, such as sedimentation balance, have been devised. In the present series of work, measurement of particle distribution was examined by the use of integrating sphere turbidimeter. First, relationship between specific scattering intensity and particle radius was examined by using periodical change of specific turbidity and particle size distribution function (f) obtained from sedimentation balance. When the particle radius is sufficiently small and the particles are monodispersed, colorless and spherical, the specific scattering intensity should be proportional to the cube of the particle radius, R. In a polydispersed system, this relationship does not hold and the intensity becomes constant, irrespective of R. In other words, turbidity of the silica suspension used in the present series of experiments is not related to the particle radius and is dependent only on concentration. Cumulative weight percentage, w (%), was then calculated from the periodical change of τ/τ₀ obtained from the integrating sphere turbidimeter, and logarithmic normal distribution equation was found to be established. Measurement with the granular balance requires higher sample concentration and a long time is required for measurement. From the result of the present series of experiments, particle distribution obtained from the integrating sphere turbidimeter seems to be more appropriate.