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Tuning chemotactic and diffusiophoretic spreading via hydrodynamic flows.

Henry C W Chu1, Stephen Garoff2, Robert D Tilton3

  • 1Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA. h.chu@ufl.edu.

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Summary
This summary is machine-generated.

Hydrodynamic flow controls the spreading of chemotactic and diffusiophoretic colloids. This research reveals tunable transport for applications like oil recovery and bioremediation.

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Area of Science:

  • Colloid and Interface Science
  • Biophysical Transport Phenomena
  • Microorganism Dynamics

Background:

  • Chemotaxis and diffusiophoresis share a
  • log-sensing
  • response, despite distinct mechanisms.

Purpose of the Study:

  • Analyze advective-diffusive transport of chemotactic/diffusiophoretic colloids in a circular tube under hydrodynamic flow and solute gradients.
  • Investigate the impact of hydrodynamic flow on colloid spreading, including decaying colloids and finite-range log-sensing.
  • Demonstrate the generality of macrotransport theory for arbitrary chemotactic models and explore anomalous spreading regimes.

Main Methods:

  • Derivation of an exact solution for the log-sensing chemotactic/diffusiophoretic macrotransport equation.
  • Generalization of the exact solution to include decaying colloids.
  • Numerical solutions for a more general chemotaxis model with finite-range log-sensing.

Main Results:

  • Strong hydrodynamic flow reduces spreading for solute-repelled colloids by suppressing super-diffusion.
  • Hydrodynamic flows consistently enhance spreading for solute-attracted colloids.
  • Tunable spreading phenomena persist for decaying colloids.
  • New anomalous spreading regimes, qualitatively matching experiments, are revealed and tunable by hydrodynamic flows.

Conclusions:

  • Macrotransport theory is broadly applicable to chemotactic and diffusiophoretic colloid transport.
  • Hydrodynamic flows offer a method to tailor colloid transport for specific applications.
  • Findings are relevant for optimizing processes such as oil recovery and bioremediation.