Four-contact impedance spectroscopy of conductive liquid samples

Details Four-contact impedance spectroscopy of conductive liquid samples Four-contact impedance spectroscopy of conductive liquid samples

2011-04-29

arxiv.org/abs/1104.5669v1

Rev.Sci.Instrum.82:073907,2011

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 6 figures

Scientific paper

10.1063/1.3609867

We present an improved approach to the impedance spectroscopy of conductive liquid samples using four-electrode measurements. Our method enables impedance measurements of conductive liquids down to the sub-Hertz frequencies, avoiding the electrode polarization effects that usually cripple standard impedance analysers. We have successfully tested our apparatus with aqueous solutions of potassium chloride and gelatin. The first substance has shown flat spectra from $\sim$100 kHz down to sub-Hz range, while the results on gelatin clearly show the existence of two distinct low frequency conductive relaxations.

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