Corrected results for the influence of size, zeta potential, and state of motion of dispersed particles on the conductivity of a colloidal suspension.
A correction of a recent work on the dependence of the DC conductivity of diluted colloidal suspensions on the size, zeta 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 reinforce the 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.
Grosse
Constantino
C
Departamento de Física, Universidad Nacional de Tucumán, Av. Independencia 1800, 4000, San Miguel de Tucumán, Argentina. cgrosse@herrera.unt.edu.ar
Pedrosa
Susana
S
Shilov
Vladimir Nikolaievich
VN