Surface Electrical Properties of Polystyrene Latex

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

“…Both the AC and DC electrical properties of micrometre and submicrometre latex particles have been investigated by many research groups, using techniques such as electrophoresis, electrical conductivity measurements, electroacoustics and dielectric spectroscopy; see, for example, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Surface Electrical Properties of Polystyrene Latex

“…The corrected ESA-signal was converted into the corresponding dynamic mobility using Eq. [1], and assuming that ⌬ ϭ 0.055 g/cm 3 . The resulting dynamic mobilities as a function of ionic strength can be seen in Fig.…”

“…7, ⌬K eff /K ϱ is plotted, where K ϱ is the bulk electrolyte conductivity, as a function of frequency. At low frequencies (Յ2 kHz), the dielectric loss term is very small and ⌬K eff /K ϱ is in practice equal to ⌬K/K ϱ , the (static) conductivity increment which has been determined previously (1,4,5). By comparing Eqs.…”

“…In this paper, we present ESA and dielectric response data on the latex suspensions we investigated before (1). These two techniques provide us with additional information about the latex system, and allow us to further test the consistency and validity of the theory which is used to interpret the data.…”

“…The ESA (electrokinetic sonic amplitude) of a colloidal suspension is related to the dynamic mobility of the particles according to (13) ESA͑͒ ϭ A͑͒͑⌬/͒͗ d ͘, [1] where is the angular frequency of the applied field, A is an instrument factor, ⌬ is the density of the particles minus the density of the solvent, and ͗ d ͘ is the particle-averaged dynamic mobility. This dynamic mobility is the high frequency analogue of the electrophoretic mobility in a static applied field, but unlike the electrophoretic mobility it is a complex quantity.…”