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Electroviscous effect for a confined nanosphere in solution.

Ali Behjatian1, Maria Bespalova1, Narain Karedla1

  • 1Physical & Theoretical Chemistry Laboratory, Department of Chemistry, South Parks Road, University of Oxford, Oxford OX1 3QZ, United Kingdom.

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Electroviscous stresses affect nanoparticle diffusion in confined spaces. This study found a moderate drag increase, refuting claims of anomalously large forces on confined charged nanoparticles.

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Area of Science:

  • Colloid and Interface Science
  • Nanoparticle Dynamics
  • Electrohydrodynamics

Background:

  • Charged colloidal particles in electrolytes exhibit electroviscous stresses due to electrohydrodynamic phenomena.
  • These stresses can alter particle diffusion coefficients, deviating from the Stokes-Einstein relation in unbounded, charge-free fluids.

Purpose of the Study:

  • To investigate the impact of electroviscous stresses on nanoparticle diffusion within confined geometries.
  • To compare experimental findings with a continuum model based on the Poisson-Nernst-Planck-Stokes equations.

Main Methods:

  • Utilized both experimental measurements and numerical simulations.
  • Employed a continuum model solving the Poisson-Nernst-Planck-Stokes system of equations.

Main Results:

  • Observed a 10-25% augmentation in viscous drag for polystyrene nanoparticles compared to pure hydrodynamic models.
  • This enhancement represents a 5-10% increase over the electroviscous contribution in unbounded fluids.
  • Found good agreement between experimental data and theoretical predictions.

Conclusions:

  • Electroviscous stresses moderately increase nanoparticle drag in confined geometries.
  • The study found no evidence supporting anomalously large electroviscous forces on confined charged nanoparticles, contradicting some recent literature.
  • Results highlight the importance of confinement and counterion size in modulating electroviscous effects.