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Diffusiophoretic Migration of Colloidal Particles in Sucrose Gradients.

Antoine Monier1, Brielle Byerley2, Julien Renaudeau1

  • 1CNRS, Syensqo, LOF, UMR 5258, Université de Bordeaux, 178 Av. Schweitzer, Pessac 33600, France.

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Summary
This summary is machine-generated.

Diffusiophoresis (DP) is particle movement caused by solute gradients. This study observed significant DP of colloids in concentrated sucrose solutions, moving towards lower concentrations.

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Area of Science:

  • Colloid and Interface Science
  • Physical Chemistry
  • Microfluidics

Background:

  • Diffusiophoresis (DP) is particle migration driven by solute gradients.
  • Experimental data for neutral solutes, especially at high concentrations, are limited.
  • Distinguishing DP from other phenomena in concentrated solutions is challenging.

Purpose of the Study:

  • To experimentally investigate diffusiophoresis of dispersed colloids in concentrated sucrose solutions.
  • To measure particle migration velocities and sucrose concentration profiles.
  • To model DP using steric exclusion and compare with experimental data.

Main Methods:

  • Utilized a microfluidic chip to create time-dependent sucrose gradients.
  • Employed particle tracking to analyze individual particle trajectories.
  • Used Raman confocal spectroscopy to measure unsteady sucrose concentration profiles.

Main Results:

  • Observed significant particle migration towards low sucrose concentration regions (velocities up to a few μm s⁻¹).
  • Measured sucrose concentration profiles align with diffusion equations, with concentration-dependent interdiffusion coefficients.
  • A steric exclusion model accurately predicted observed particle trajectories with an exclusion length of 5 ± 0.9 Å.

Conclusions:

  • Demonstrated and quantified diffusiophoresis in concentrated sucrose solutions.
  • Validated a steric exclusion model for diffusiophoresis.
  • Identified Brownian motion, diffusioosmosis, and buoyancy as potential sources of experimental data scattering.