Hydraulic pressures generated in Magnetic Ionic Liquids by paramagnetic fluid/air interfaces inside of uniform tangential magnetic fields

• MILs are “2nd-Gen” magnetic liquids without dispersed magnetic particles.
• Uniform tangential magnetic fields produce magnetic hydraulic pressures in MILs.
• FHD-Bernoulli eq. predicts the magnetic hydraulic pressure or head (>900 Pa or 6 cm).
• Phenomena directly related to magnetic susceptibility and the field strength squared.
• Phenomena could complicate research of MILs as reaction media or separation agents.

HypothesisMagnetic Ionic Liquid (MILs), novel magnetic molecules that form “pure magnetic liquids,” will follow the Ferrohydrodynamic Bernoulli Relationship. Based on recent literature, the modeling of this fluid system is an open issue and potentially controversial.ExperimentsWe imposed uniform magnetic fields parallel to MIL/air interfaces where the capillary forces were negligible, the Quincke Problem. The size and location of the bulk fluid as well as the size and location of the fluid/air interface inside of the magnetic field were varied. MIL properties varied included the density, magnetic susceptibility, chemical structure, and magnetic element.FindingsUniform tangential magnetic fields pulled the MILs up counter to gravity. The forces per area were not a function of the volume, the surface area inside of the magnetic field, or the volume displacement. However, the presence of fluid/air interfaces was necessary for the phenomena. The Ferrohydrodynamic Bernoulli Relationship predicted the phenomena with the forces being directly related to the fluid’s volumetric magnetic susceptibility and the square of the magnetic field strength. [emim][FeCl4] generated the greatest hydraulic head (64-mm or 910 Pa at 1.627 Tesla). This work could aid in experimental design, when free surfaces are involved, and in the development of MIL applications.

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