Francisco J. Arroyo

TL;DR: The characteristic relaxation frequency of the dielectric constant was pH-dependent, with a significant minimum at pH 7 in all cases, which is in good agreement with the initial assumption that at acid pH values, the electric surface charge of faces is negative, whereas the edges possess a positive charge, thus favoring attractive face-to-edge interaction.

TL;DR: It can be concluded that in general the presence of a dynamic Stern layer causes the electrophoretic mobility to decrease and the electrical conductivity to increase in comparison with the standard case for every volume fraction, zeta potential, and double-layer thickness.

TL;DR: In this article, the authors used the classical electrokinetic equations and a cell model accounting for particle-particle interactions to calculate the dielectric spectra of concentrated (volume fractions up to 50%) suspensions of spheres.

TL;DR: Some aspects of the rheological behavior of sodium montmorillonite suspensions in the pH range 3 to 9, of NaCl concentrations between 10(-3) and 10(-1) M, and of solid concentrations between 5 and 11% w/v are investigated.

TL;DR: It is found that epsilon''(D) displays two separated behaviors when plotted against log omega in the frequency range 100 Hz-1 MHz: a monotonous decrease followed by an absorption peak (associated with the double-layer relaxation, or alpha-relaxation), which makes it possible to easily find the characteristic frequency of the alpha- Relaxation.