METHOD FOR MEASURING DISTRIBUTION FUNCTION OF COLLOIDAL PARTICLES BY SIZE IN AQUEOUS SOLUTION

摘要

FIELD: physics.;SUBSTANCE: method is proposed comprising placing the studied colloidal solution in a cell, which represents a flat capacitor, polarizing the solution under the action of an external electric field with a strength of 1-10³ V/cm, measuring the characteristics of the medium, their computer processing. According to the invention, the measured characteristics of the medium are the frequency dependence of the impedance Z(ω) and angle of ϕ(ω) phase shift, on the basis of which an expression for the actual ε' and imaginary ε" dielectric capacitance is obtained by computer processing, the sum of which is described by the formula , where E is the electric field strength, d_i, n_i and τ_i- the dipole moment, the concentration of particles in the suspension and the particle relaxation time of the i-th type, and the dipole moment is a function of the particle radius d_i=d(r_i), from the obtained expression for dielectric capacitances a distribution histogram of colloid particles is constructed by computer processing, the histogram ordinate is proportional to the radius r_i of the colloidal particle of the i-th type, and the center of the column along the abscissa axis is located in the value of the average particle concentration of the i-th type.;EFFECT: increasing the accuracy and reliability of determining the size distribution of colloidal particles.;1 cl