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Ferrofluid Microdroplet Splitting for Population-Based Microfluidics and Interfacial Tensiometry.

Mika Latikka1, Matilda Backholm1, Avijit Baidya1,2

  • 1Department of Applied Physics Aalto University School of Science Puumiehenkuja 2 Espoo 02150 Finland.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 28, 2020
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Summary

Magnetic fields cause ferrofluid droplets to split, forming smaller droplets. This process, influenced by surface roughness and fluid properties, enables new microfluidic applications and interfacial tension measurements.

Keywords:
ferrofluidsfluid dynamicsinterfacial tensionmagnetic fieldsmagnetic nanoparticlesmicrofluidics

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Area of Science:

  • Fluid dynamics
  • Magnetohydrodynamics
  • Materials science

Background:

  • Ferrofluids combine liquid properties with strong magnetic response.
  • Magnetic field interactions with ferrofluids offer unique functional properties.

Purpose of the Study:

  • To investigate magnetic-field-induced splitting of ferrofluid droplets.
  • To explore the dynamics, influencing factors, and applications of this phenomenon.

Main Methods:

  • High-speed imaging to observe droplet splitting dynamics.
  • Systematic variation of magnetic field strength, nanoparticle concentration, and surfactant concentration.
  • Investigation of surface roughness effects on satellite droplet formation.

Main Results:

  • Droplet splitting occurs rapidly (<0.1 s) via Plateau-Rayleigh-like instability.
  • Splitting dynamics and self-assembly of microdroplets depend on magnetic field strength and fluid properties.
  • Observed outcomes range from labyrinthine patterns to discrete droplets, controllable by magnetization and interfacial tension.

Conclusions:

  • Ferrofluid droplet splitting is a controllable process influenced by magnetic fields and fluid properties.
  • This phenomenon can be utilized for precise interfacial tension measurements.
  • A population-based digital microfluidics concept is proposed using self-assembled microdroplets.