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Long-range, selective, on-demand suspension interactions: Combining and triggering soluto-inertial beacons.
Anirudha Banerjee1, Todd M Squires1
1Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106-5080, USA.
Science Advances
|August 28, 2019
Summary
New soluto-inertial (SI) interactions use "beacons" to control particle movement in suspensions. These methods enable on-demand and selective colloidal migration, opening new avenues for separation and delivery applications.
Area of Science:
- Colloidal science
- Soft matter physics
- Chemical engineering
Background:
- Particles in suspension can interact via diffusiophoresis, driven by solute gradients.
- Slowly releasing solute from structures creates persistent nonequilibrium solute fluxes.
Purpose of the Study:
- To introduce and demonstrate the versatility of soluto-inertial (SI) interactions.
- To showcase strategies for manipulating solute gradients and suspension behavior using "beacons."
Main Methods:
- Utilizing "beacons" with diverse physicochemical properties to establish and sustain solute fluxes.
- Implementing triggered actuation for on-demand particle migration.
- Employing multiple distinct beacons to create synergistic effects on solute gradients.
Main Results:
- Demonstrated on-demand particle migration via actuated beacons.
- Showcased directed and selective colloidal migration using multiple synergistic beacons.
- Observed enhanced migration velocities and delayed equilibration of SI effects with multibeacon systems.
Conclusions:
- SI interactions offer a versatile platform for controlling colloidal behavior.
- Novel strategies using distinct beacons enable precise manipulation of particle migration.
- These findings suggest new possibilities for colloidal separation, targeted delivery, and flocculation.
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