Seismoelectric effect: A non-isochoric streaming current. 1. Experiment.

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Autorinnen und Autoren: Dukhin AS, Goetz PJ, Thommes M
Zeitschrift: Journal of Colloid and Interface Science
Verlag: Elsevier B.V.
Jahr der Veröffentlichung: 2010
Band: 345
Heftnummer: 2
Seitenbereich: 547-553-553
ISSN: 0021-9797


Propagation of ultrasound through a porous body satd. with liq. generates an elec. response. This electroacoustic effect is called the "seismoelec. current"; the reverse process, when an elec. field is the driving force, is called the "electroseismic current.". Seismoelec. currents can be measured with electroacoustic devices originally designed for characterizing liq. dispersions. Such electroacoustic devices must first be calibrated with a liq. dispersion and then used to characterize a porous body. We demonstrated such measurements of the seismoelec. current with electroacoustic devices in three different types of porous bodies. The first porous body was a deposit of solid submicrometer particles. We monitored the kinetics of the deposit formation on the surface of the electroacoustic probe. It allowed us to unambiguously confirm that the measured signal was generated by the deposit. We were also able to ext. information about the porosity of the forming deposits. The second type of porous body was again a deposit, but instead of solid submicrometer particles, we used very large, porous glass spheres. According to classical theory, these glass particles are not supposed to generate any electroacoustic signal because colloid vibration current decays with increasing particle size due to the particles inertia. Nevertheless, we measured a strong signal, which was apparently assocd. with the pores of the particles. We were able to derive some conclusions about the dependence of the seismoelec. current on the pore size. The last tests were performed with cylindrical sandstone cores. These porous bodies have a very high hydrodynamic resistance that prevents measurement of the classical streaming current. We are able to measure a strong seismoelec. current that correlates with porosity of the cores. [on SciFinder(R)]

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Dukhin, A.S., Goetz, P.J., & Thommes, M. (2010). Seismoelectric effect: A non-isochoric streaming current. 1. Experiment. Journal of Colloid and Interface Science, 345(2), 547-553-553.

Dukhin, Andrei S., Philip J. Goetz, and Matthias Thommes. "Seismoelectric effect: A non-isochoric streaming current. 1. Experiment." Journal of Colloid and Interface Science 345.2 (2010): 547-553-553.


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