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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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Streaming Current for Surfaces Covered by Square and Hexagonal Monolayers of Spherical Particles.

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Streaming current measurements can determine particle coverage on flat substrates. Roughness can significantly reduce streaming current, even with small particles.

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Area of Science:

  • Colloid and Surface Science
  • Electrokinetics
  • Computational Fluid Dynamics

Background:

  • Streaming current measurements are sensitive to surface properties.
  • Understanding particle coverage on substrates is crucial for various applications.
  • Hydrodynamic interactions and charge transport influence streaming current.

Purpose of the Study:

  • To theoretically evaluate interface and particle contributions to streaming current.
  • To develop fitting functions for approximating numerical results.
  • To assess the utility of streaming current measurements for determining particle coverage.

Main Methods:

  • Theoretical evaluation of streaming current for ordered and random particle arrangements.
  • Approximation of numerical results using fitting functions with exponential and linear terms.
  • Analysis of hydrodynamic screening and charge convection effects.

Main Results:

  • Streaming currents for ordered and random arrangements differ within experimental error.
  • Fitting functions accurately approximate numerical results.
  • Roughness can reduce streaming current by over 30% for equal zeta potentials.

Conclusions:

  • Streaming current measurements, combined with fitting functions, offer a convenient method for evaluating particle coverage.
  • Detailed knowledge of particle distribution is not always necessary.
  • Surface roughness significantly impacts streaming current, highlighting its importance in electrokinetic phenomena.