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Related Experiment Videos

Frequency-Dependent Streaming Potentials.

Philip M. Reppert1, Frank Dale Morgan, David P. Lesmes

  • 1Earth Resources Laboratory, Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, E34-356a, 42 Carleton Street, Cambridge, Massachusetts, 02142

Journal of Colloid and Interface Science
|February 13, 2001
PubMed
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Researchers measured frequency-dependent streaming potentials, revealing new insights into porous media. Pride

Area of Science:

  • Electrokinetic phenomena
  • Porous media physics
  • Geophysics

Background:

  • Streaming potential measurements are crucial for understanding fluid flow in porous materials.
  • Previous studies were limited in frequency range and did not fully characterize complex impedance.
  • Accurate modeling requires understanding frequency-dependent behavior.

Purpose of the Study:

  • To experimentally measure the real and imaginary parts of streaming potentials as a function of frequency.
  • To extend the frequency range of streaming potential measurements beyond previous limits.
  • To compare existing theoretical models (Packard and Pride) with new experimental data.

Main Methods:

  • Construction of a novel experimental apparatus and data acquisition system.

Related Experiment Videos

  • Frequency-dependent streaming potential experiments on glass capillaries and porous glass filters (pore diameters 1 mm to 34 µm).
  • Comparison of experimental data with Packard and Pride frequency-dependent models.

    • Main Results:

    • Both models showed good agreement with data in low-to-intermediate frequencies.
    • High-frequency data required corrections for capacitance effects to match theoretical models.
    • Pride's generalized model demonstrated superior accuracy in estimating pore sizes.

    Conclusions:

    • The study successfully measured frequency-dependent streaming potentials across an extended range.
    • Pride's model shows promise for more accurate pore size and potentially permeability determination in porous media.
    • Experimental capacitance effects must be considered for high-frequency electrokinetic modeling.