Shaping and transporting diamagnetic sessile drops

Jennifer Dodoo, Adam A. Stokes

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Electromagnetic fields are commonly used to control small quantities of fluids in microfluidics and digital microfluidics. Magnetic control techniques are less well studied than their electric counterparts, with only a few investigations into liquid diamagnetism. The ratio of magnetic to surface energy (magnetic Bond number B m) is an order of magnitude smaller for diamagnetic drops (B m ≈-0.3 at 1.2 T applied field) than for paramagnetic drops (B m ≈ 9.0 at 1.2 T applied field). This weaker interaction between the magnetic field and the diamagnetic drop has led to the phenomenon being overlooked in digital microfluidics. Here, we investigate shaping and transport of diamagnetic drops using magnetostatic fields. Our findings highlight how diamagnetic fluids can be used as a novel tool in the toolbox of microfluidics and digital microfluidics.

Original languageEnglish
Article number064110
JournalBiomicrofluidics
Volume13
Issue number6
DOIs
Publication statusPublished - 12 Nov 2019

Keywords

  • microfluidics
  • digital microfluidics
  • sessile drops

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