Streaming Current Isochoric and Non Isochoric

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Steaming potential and streaming current occur in porous bodies when liquid is being pumped through them. These electrokinetic phenomena have been known for almost 200 years. It is widely used for studying zeta potential in porous bodies. The main field of application so far is in the paper industry. Streaming potential is usually the preferred way of performing this measurement. However, the streaming current method does not require conductivity for calculating zeta potential, which presents a certain advantage.

One of the important areas of the streaming current and streaming potential application is seismoelectric effect . This phenomenon occurs in underground rocks when sound waves propagate through. This seismoelectric effect is widely used for characterizing underground formations with regard to water or oil presence.

Our DT-300 zeta potential probe is suitable for characterizing streaming current in cores at high frequency of 3 MHz. It can be very useful for measuring zeta potential of cores and predicting of wettability of porous bodies. It also offers possibility of modeling seismoelectric effect in laboratory conditions and single frequency. This dramatically simplifies theory verification and modeling.

Streaming potential and streaming current are also used for monitoring and quality control of chromatographic resins. Zeta potential of the pores controls interaction of these resins with proteins. That is why detail information of the resin zeta potential allows optimization of protein treatment.

Another application of our method for streaming current measurement is study of the structure in carbon nano-tubes dispersions. It turns out that phase of streaming current is very sensitive to the strength of the carbon nano-tube’s structure.

REFERENCES:

1.Frenkel J. “On the Theory of Seismic and Seismoelectric Phenomena in a Moist Soil”, re-published, J. Engineering Mechanics, 131, 9, pp. 879-887 (2005). http://cedb.asce.org/cgi/WWWdisplay.cgi?0527243

2.Dukhin, A.S., Goetz, P.J. and Thommes M. “Seismoelectric effect: non-isochoric Streaming Current. 1. Experiment”, JCIS, (2010)

3.Dukhin, A.S., and Shilov, V.N. “Seismoelectric effect: non-isochoric Streaming Current. 2. Theory and experimental verification”, JCIS, (2010)