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Related Experiment Video

Updated: Jun 26, 2026

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Published on: January 3, 2014

Boundary effect on diffusiophoresis: spherical particle in a spherical cavity.

Jyh-Ping Hsu1, Wei-Lun Hsu, Zheng-Syun Chen

  • 1Department of Chemical Engineering; National Taiwan University, Taipei, Taiwan 10617. jphsu@ntu.edu.tw

Langmuir : the ACS Journal of Surfaces and Colloids
|January 7, 2009
PubMed
Summary

The boundary effect on charged particle diffusiophoresis is influenced by cavity presence, affecting particle velocity. Particle behavior is governed by double-layer relaxation and polarization, with complex velocity variations observed.

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Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions

Published on: February 17, 2019

Area of Science:

  • Colloid and Interface Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Diffusiophoresis describes particle motion in a solute gradient.
  • Charged particles in confined geometries exhibit complex behaviors.
  • Surface potential and double-layer thickness are key parameters in colloidal dynamics.

Purpose of the Study:

  • To theoretically analyze the boundary effect on diffusiophoresis of a charged sphere within a spherical cavity.
  • To investigate the influence of surface potential, double-layer thickness, and particle position on diffusiophoretic velocity.
  • To elucidate the interplay of double-layer relaxation, chemiosmotic/diffusioosmotic flow, and double-layer polarization.

Main Methods:

  • Theoretical analysis of a charged sphere's diffusiophoresis.
  • Consideration of arbitrary surface potential, double-layer thickness, and position within an uncharged spherical cavity.
  • Mathematical modeling of fluid flow and electrostatic interactions.

Main Results:

  • The cavity significantly alters diffusiophoretic behavior, especially at high surface potentials.
  • Scaled diffusiophoretic velocity exhibits a local maximum with varying particle position.
  • Velocity can show both local maximum and minimum as double-layer thickness changes.
  • The impact of double-layer relaxation is dependent on surface potential and electric Peclet number.

Conclusions:

  • Cavity boundaries introduce complex modulations to particle diffusiophoresis.
  • Understanding these boundary effects is crucial for controlling particle transport in confined systems.
  • The study highlights the importance of electrokinetic phenomena in micro/nanoscale fluidics.