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Streaming potential near a rotating porous disk.

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Summary

This study introduces a new method to measure zeta potential and permeability of porous materials using a rotating disk. The technique provides accurate characterization without sample compression.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Fluid Dynamics

Background:

  • Streaming potential measurements are crucial for understanding electrokinetic phenomena in porous media.
  • Characterizing the zeta potential and permeability of open-structured materials can be challenging with traditional methods.

Purpose of the Study:

  • To develop and validate a novel method for determining zeta potential and Darcy permeability of porous materials using a rotating disk.
  • To investigate the relationship between streaming potential, rotation rate, and material properties.

Main Methods:

  • Theoretical modeling of streaming potential generated by a rotating porous disk.
  • Experimental measurement of streaming potential in the vicinity of a rotating disk.
  • Application of Darcy's law and Smoluchowski's equation for data analysis.

Main Results:

  • Streaming potential is proportional to zeta potential and disk dimensions.
  • At low rotation rates, streaming potential scales with the square of rotation; at high rates, it becomes invariant.
  • Streaming potential is invariant with permeability at low rates and inversely proportional to the square of permeability at high rates.
  • Accurate zeta potential (-56 mV) and permeability (8.7 × 10⁻⁹ m²) were obtained for Velcro.

Conclusions:

  • The rotating disk method effectively determines zeta potential and permeability of open-structured materials without compression.
  • A new formula for space-charge density in porous media was derived: -εζ/k.
  • This technique offers a versatile approach for characterizing diverse porous materials.