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Area of Science:

  • Surface science
  • Microfluidics
  • Materials science

Background:

  • Liquid manipulation is vital but current methods are complex or inflexible.
  • Existing technologies often require significant energy input or fixed surface properties.

Purpose of the Study:

  • To develop a simple, adjustable 3D liquid manipulation paradigm.
  • To control liquid behavior by integrating interfacial energy with programmable magnetic fields.

Main Methods:

  • Utilized a hierarchical rectifier with magnetized microratchets.
  • Coupled liquid-air-solid interfacial energy with programmable magnetic fields.
  • Exploited Laplace pressure asymmetry for directional liquid steering.

Main Results:

  • Demonstrated multimodal directional steering of liquids (23-72 mN m⁻¹).
  • Showcased scale-dependent microratchet effects for volumes from 10⁰–10³ µL.
  • Achieved a 2000-fold increase in critical Weber number for ethanol in the inertia-dominant regime.

Conclusions:

  • The paradigm offers versatile control over liquid transport and 3D manipulation.
  • Scalable design enables applications in portable testing, microfluidics, and automated reactions.
  • The technology provides a new platform for advanced liquid handling.