Low-Frequency Dielectric Response of Polystyrene Latex Dispersions

The electrokinetic properties of latex particles: comparison of electrophoresis and dielectrophoresis

“…(13) and (14), Θ = 0 E q s . (13) and (14) ting the mobility of the ions to their bulk value, this gives a charge density in the Stern layer of 1.3 µC/cm 2 , similar to that measured by Minor et al [41,42] for sulphate latex at 1.61 µC/cm 2 . Lyklema and Minor [31] calculated the diffuse layer charge density of plugs of 800 nm diameter sulphated polystyrene.…”

“…notably Minor et al [41,42]. They performed plug conductivity measurements together with low frequency dielectric measurements on sulphate latex and obtained a constant surface conductance of 5.7 nS over a wide range of molarities.…”

Analysis of the Dielectric Permittivity of Suspensions by Means of the Logarithmic Derivative of Its Real Part

“…5, 32) that experimental LFDD data often overestimate theoretical predictions, even if a complete electrokinetic theory like that of DeLacey and White (8) is used. Both theoretically (11) and experimentally (5,(32)(33)(34), it has been shown that the disagreement could be reduced if an electrokinetic theory based on the existence of a dynamic Stern layer (DSL) is employed instead of a standard model. In a DSL description, ions beneath the electrokinetic shear plane are assumed to be able to move tangentially to the surface, contrary to so-called standard or classical theories, in which both the fluid and the ions located in the inner part of the double layer are thought of as rigidly bound to the solid, hence completely immobile.…”

“…6 suggest that part of the overestimation could be associated to the procedure used to get rid of electrode polarization, we will now consider to what extent this is the situation. Thus, we performed measurements of electrophoretic mobility in all the suspensions, and used the O'Brien and White theory (33) to compute the electrokinetic potential, ζ (Table 5). This quantity, together with the particle radius and the concentrations, valencies, and mobilities of ions in solution, are the input parameters needed to calculate ε (ω) in the DeLacey and White approach.…”

Numerical Results for the Dielectric Dispersion Parameters of Colloidal Suspensions

“…This led to the simultaneous development of the experimental techniques (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) as well as theoretical (16)(17)(18)(19)(20)(21)(22)(23)(24)(25) and numerical (26)(27)(28)(29)(30) interpretations of the behavior of these systems.…”