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Microfluidic solute transport is governed by diffusion. This study used Brownian Dynamics simulations to show that pH-fields alter particle size, influencing diffusion and leading to particle accumulation in high-diffusivity zones for optimal throughput.

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Area of Science:

  • Fluid Dynamics
  • Physical Chemistry
  • Materials Science

Background:

  • Solute transport and intermixing in microfluidic devices are critically dependent on diffusional processes.
  • Understanding these diffusion dynamics is key to optimizing microfluidic applications.

Purpose of the Study:

  • To investigate solute transport and intermixing in microfluidic devices under varying conditions.
  • To explore the influence of a pH-field on microgel particle behavior and diffusion.
  • To analyze the impact of spatial variations in diffusivity on particle concentration and throughput.

Main Methods:

  • Brownian Dynamics simulations were employed to model pressure-driven flow of microgel particles in microchannels.
  • Simulations were conducted in 1D, 2D, and 3D to capture cross-flow dependencies, flow effects, and particle concentration.
  • The study focused on pH-induced spatial variations in particle size, self-diffusion coefficient, and thermodynamic state.

Main Results:

  • A pH-field induced stripe-like spatial variations in the diffusion coefficient.
  • Non-Gaussian dynamics and skew Brownian motion, termed "diffusing diffusivity," were observed.
  • Particles accumulated in regions of higher diffusivity, with maximum throughput achieved when this region was centrally located.

Conclusions:

  • Spatial variations in diffusivity significantly impact solute transport and particle distribution in microfluidic channels.
  • The findings provide insights into controlling particle behavior and enhancing throughput in microfluidic systems.
  • The observed "diffusing diffusivity" phenomenon offers a new perspective on complex diffusion dynamics.