Beobachtungen zum dielektrischen Verhalten disperser Systeme

The Dielectric Properties of Water–Dielectric Interphases

“…What is immediately important is the fact that these experiments give added evidence that C, originates at the dielectric side of the interphase. That C, is greatly sensitive to the presence of surface-active molecules, such as soap, is shown by the data in There is some indication (14,15) that-(is dependent-upon the electric charge on the interphase, C, being generally smallest when the charge is zero.…”

“…This influence of the interphases is especially pronounced when measurement is made with direct current or with alternating current of low frequency, in which case the dielectric properties may be radically different from those of either of the components, as measured in the bulk.Recent measurements by Fricke and Curtis (11, 12) of the dielectric constant and electric conductance of suspensions show this influence of the interphases clearly; there is a rapid increase of the dielectric constant and a decrease of the conductance as the frequency decreases, the change in both being approximately as powers of the frequency. The high dielectric constant often found for colloidal solutions is undoubtedly also of this origin (6,11,14,15,16,20,21). This property was first observed by Errera on colloidal vanadium pentoxide (6), and explained by him as due to electric moments of the colloidal particles.…”

“…figure 2. There is some indication(14,15) that-(is dependent-upon the electric charge on the interphase, C, being generally smallest when the…”