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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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AC Electrokinetic Phenomena Generated by Microelectrode Structures
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Spontaneous Electrokinetic Magnus Effect.

Zachary M Sherman1, James W Swan1

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

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|June 6, 2020
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Summary
This summary is machine-generated.

Colloids exhibit Quincke rotation in electric fields. Charged colloids display a novel electrokinetic Magnus (EKM) effect, moving perpendicularly to fields and rotation axes, mimicking the Magnus effect without particle anisotropy.

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Area of Science:

  • Colloid science
  • Electrokinetics
  • Soft matter physics

Background:

  • Colloids in electrolytes under electric fields form ion clouds.
  • An electric field instability causes Quincke rotation (particle rotation).
  • Orthogonal motion typically requires anisotropic properties.

Purpose of the Study:

  • Characterize a new electrokinetic transport mode.
  • Investigate coupling between Quincke rotation and electrophoretic motion.
  • Explain the electrokinetic Magnus (EKM) effect for isotropic spheres.

Main Methods:

  • Explicit ion Brownian dynamics simulations.
  • Development of a continuum, analytic electrokinetic theory.
  • Comparison of simulation and theoretical results.

Main Results:

  • Discovered EKM effect: charged colloids move orthogonally to fields and rotation axes.
  • EKM effect occurs for isotropic spheres in unbounded environments.
  • Nonlinear ion descriptions impact Quincke rotation and EKM effect.

Conclusions:

  • Quincke rotation instability breaks symmetry, enabling EKM effect for spheres.
  • EKM effect is an electrokinetic analogue to the Magnus effect.
  • Theoretical and simulation studies confirm the EKM phenomenon and its underlying physics.