Corrected results for the influence of size, ζ potential, and state of motion of dispersed particles on the conductivity of a colloidal suspension

CONSTANTINO GROSSE; SUSANA PEDROSA; VLADIMIR SHILOV

JOURNAL OF COLLOID AND INTERFACE SCIENCE

Elsevier

Año: 2003 vol. 265 p. 197 - 201

0021-9797

A correction of a recent work on the dependence of the DC conductivity of diluted colloidal suspensions on the size, ζ potential, and state of motion of dispersed particles (C. Grosse, S. Pedrosa, V.N. Shilov, J. Colloid Interface Sci. 251 (2002) 304) is presented. It is shown that the procedure used in that work to calculate the contribution of the particles to the conductivity of the suspension leads to a result that includes the variation of the conductivity of the dispersion medium. Revised analytical and numerical calculations are presented, which strongly reinforcethe conclusions reached in the original work: The expression for the conductivity increment based on the value of the dipolar coefficient of the suspended particles (calculated taking into account their electrophoretic motion) appears to be valid over the whole range of particle sizes.