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Updated: Oct 27, 2025

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Flow pumping by external periodic shear applied to a soft interface.

Shima Nezamipour1, Ali Najafi2,3

  • 1Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran.

Scientific Reports
|July 23, 2021
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Summary
This summary is machine-generated.

A single colloidal particle near a soft wall can pump viscous fluids. This microfluidic pumping mechanism, driven by particle oscillation, offers new possibilities for fluid manipulation.

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Area of Science:

  • Fluid dynamics
  • Colloidal science
  • Microfluidics

Background:

  • Flow pumping is crucial for microfluidic devices.
  • Controlling fluid flow at the microscale presents significant challenges.

Purpose of the Study:

  • To demonstrate a novel microfluidic pumping mechanism using a single colloidal particle.
  • To analyze the fluid flow generated by oscillating a particle near a soft wall.

Main Methods:

  • Utilizing optical tweezers to manipulate a single colloidal particle.
  • Employing a perturbative scheme for theoretical analysis.
  • Investigating fluid dynamics near a soft boundary.

Main Results:

  • A single oscillating colloidal particle can generate a net fluid flow perpendicular to a soft wall.
  • The generated flow is dependent on the particle's motion and the soft wall's properties.
  • The flow scales with the capillary number, as shown by theoretical analysis.

Conclusions:

  • This study presents a new method for microfluidic pumping using a single particle.
  • The findings have implications for designing microfluidic devices and systems.
  • Further research can explore optimizing this pumping mechanism for various applications.