Speaker
Description
Chemical gradients are ubiquitous in porous and confined environments, arising from localized solute release, dissolution, and reactive boundaries. Yet pore-scale transport models often treat colloids as passive tracers whose spreading is set by advection, diffusion, and geometric trapping. Here we show that even weak gradients can qualitatively reshape colloid dispersion through diffusiophoresis, i.e., a solute–surface–driven drift that causes particle motion relative to the fluid. We study the evolution of an initially localized colloidal blob transported through model porous media, where solute gradients between the blob and the background fluid induce cross-streamline diffusiophoretic migration. This migration redistributes colloids between low- and high-velocity pathways, leading to pore-scale rearrangements that modify the macroscopic dispersion of the blob. We finally outline a minimal modeling framework that links phoretic mobility at the pore scale to the effective transport metrics.
| Country | United States |
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