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Related Experiment Video

Updated: Feb 2, 2026

A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers
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Surface swimmers, harnessing the interface to self-propel.

G Grosjean1, M Hubert2, Y Collard2

  • 1GRASP, Université de Liège, Allée du 6 Aot 19, 4000, Liège, Belgium. ga.grosjean@uliege.be.

The European Physical Journal. E, Soft Matter
|November 24, 2018
PubMed
Summary
This summary is machine-generated.

Artificial micro-swimmers leverage interfacial physics for propulsion. This study explores how interfaces break symmetry, enabling locomotion for micro-robots in flows, with applications in mixing and drug delivery.

Keywords:
Topical issue: Flowing Matter, Problems and Applications

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Microfluidics

Background:

  • Self-propulsion of micro-robots is crucial for applications like flow control and drug delivery.
  • Interfacial physics offers a mechanism for generating propulsion at the microscale.
  • Recent experiments demonstrate the use of interfaces for micro-robot locomotion.

Purpose of the Study:

  • To discuss how interfaces provide necessary symmetry breaking for micro-robot propulsion.
  • To review experimental approaches using interfacial forces for locomotion.
  • To detail specific systems of self-propelling micro-robots.

Main Methods:

  • Overview of recent experiments on interfacial propulsion.
  • Detailed analysis of floating ferromagnetic spheres forming swimming structures (triangular and collinear).
  • Introduction of a new magnetically powered centimeter-sized swimmer.

Main Results:

  • Interfaces can provide the symmetry breaking required for propulsion.
  • Ferromagnetic spheres self-assemble into functional swimmers.
  • A new interpretation of triangular swimmers and non-monotonic effects in collinear swimmers are presented.
  • A novel water-strider-like magnetic swimmer is introduced.

Conclusions:

  • Interfacial physics is a viable strategy for designing self-propelling micro-robots.
  • The study presents novel insights into existing swimmer designs and introduces a new system.
  • This research contributes to the development of micro-robotics for various applications.