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Elektrokinetische untersuchungen an fasern, 1. Theoretische zusammenhänge

✍ Scribed by Aichele, Wilfried ;Schollmeyer, Eckhard ;Herlinger, Heinz

Publisher
Wiley (John Wiley & Sons)
Year
1977
Weight
573 KB
Volume
178
Category
Article
ISSN
0025-116X

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✦ Synopsis

Abstract

Some relations between electrokinetic properties are shown. First by means of phenomenological equations, the electroviscose effect is explained to be due to the electroosmotic backstreaming. It is shown that in principle the equivalence of streaming‐current‐and streaming‐potential‐methods to get zetapotentials is included in these equations. This equivalence was used first by Smoluchowski to derive his equation for the zeta‐potential for the special case of a single capillary. The equation he found concerning the relations between both zeta‐potential and streaming‐potential and streaming current between the ends of a capillary was extended by different authors to bundles of capillaries and then to plugs. It is discussed, which of the extensions are correct and which properties should be included in a so‐called “porosity factor”.

From a mathematical treatment of the surface conductivity in case of capillaries it is shown that zeta‐potentials can be obtained in principle by measuring the conductivity of the system plug‐electrolyte. For this system a procedure is deduced to calculate approximately the porosity factor from measurements of the electrical resistance.

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