Field-induced shaping of sessile paramagnetic drops

Jennifer Dodoo, Adam A. Stokes

Research output: Contribution to journalLetter

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Abstract

We use the electromagnetic stress tensor to describe the elongation of paramagnetic drops in uniform magnetic fields. This approach implies a linear relationship between the shape of the drops and the square of the applied field, which we confirm experimentally. We show that this effect scales with the volume and susceptibility of the drops. By using this unified electromagnetic approach, we highlight the potential applications of combining electric and magnetic techniques for controlled shaping of drops in liquid displays, liquid lenses, and chemical mixing of drops in microfluidics.
Original languageEnglish
Article number061703
Number of pages5
JournalPhysics of Fluids
Volume32
Issue number6
DOIs
Publication statusPublished - 5 Jun 2020

Keywords

  • digital microfluidics
  • paramagnetic drops
  • liquid display
  • liquid lenses

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