Dielectric spectroscopy of colloidal dispersions: Comparisons between experiment and theory

Image time-correlation, dynamic light scattering, and birefringence for the study of the response of anisometric colloids to external fields

“…There is an increasing interest in the response of suspensions to external fields, particularly in an electric fields, [1][2][3][4][5][6] which can be used to induce and direct self-assembly of charged colloids (see Ref. 7 for a detailed overview as well as Ref.…”

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

“…The low-frequency dielectric dispersion (LFDD) of colloidal suspensions has recently gained significance as an experimental technique for their characterization because of its extreme sensitivity to the structure of the electric double layer (EDL) surrounding the particles, under conditions of both equilibrium and nonequilibrium (1)(2)(3)(4)(5). The method involves the determination of the (complex) permittivity ε * (ω) or conductivity K * (ω) as a function of the frequency of an externally applied AC field.…”

“…These mainly include measuring at variable distance between electrodes (1), using four-electrode cells (3,17,18), or the so-called quadrupole technique (19,20). But even with these sophisticated and well-established techniques, the low-frequency (below a few kilohertz, say) dielectric constant of the suspensions is often out of our reach, this shedding some degree of uncertainty on one of the essential features of LFDD, namely, the dielectric dispersion amplitude.…”

“…Nevertheless, numerical integration of Eq. [2] requires reliable data on ε (ω) in a wide enough frequency range, including of course the critical region of EP predominance. Recently, Wübbenhorst and Turnhout (28, see also Ref.…”

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.…”