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Copyright Brian J. Kirby. With questions, contact Prof. Kirby here. This material may not be distributed without the author's consent. When linking to these pages, please use the URL http://www.kirbyresearch.com/textbook.

This web posting is a draft, abridged version of the Cambridge University Press text. Follow the links to buy at Cambridge or Amazon or Powell's or Barnes and Noble. Contact Prof. Kirby here.

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Jump To: [Kinematics] [Couette/Poiseuille Flow] [Fluid Circuits] [Mixing] [Electrodynamics] [Electroosmosis] [Potential Flow] [Stokes Flow] [Debye Layer] [Zeta Potential] [Species Transport] [Separations] [Particle Electrophoresis] [DNA] [Nanofluidics] [Induced-Charge Effects] [DEP] [Solution Chemistry]

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Chapter 17
Particle and droplet actuation: dielectrophoresis, magnetophoresis, and digital microfluidics

Microsystems employ several techniques to actuate particles beyond the electrophoresis discussed in Chapter 13. We describe two physical phenomena in this chapter—dielectrophoresis and magnetophoresis—which are commonly used in microdevices to manipulate particle or droplets in suspension. We also discuss digital microfluidics, which is not a physical phenomenon, but rather a system concept for manipulating fluid droplets using AC electric fields.

Related work on dielectrophoresis from our research group can be found here.

microfluidics textbook nanofluidics textbook Brian Kirby Cornell Figure 17.1: Capture and sorting of cells using dielectrophoresis. (A, B): Live and dead cells are captured in distinct regions [185] using multiple electrode configurations and multiple-frequency dielectrophoresis. (C): A dielectrophoretic “gate” [186] controls passage of selected particles downstream of the gate .

17.1 Dielectrophoresis
  17.1.1 Inferring the Coulomb force on an enclosed volume from the electric field outside the volume
  17.1.2 The force on an uncharged, uniform, isotropic sphere in a linearly varying electric field with uniform, isotropic phase
  17.1.3 Maxwellian equivalent body for inhomogeneous, spherically symmetric particles
  17.1.4 Dielectrophoresis of charged spheres
  17.1.5 Dielectrophoresis of non-spherical objects
  17.1.6 Nonuniform and anisotropic phase effects
17.2 Particle magnetophoresis
  17.2.1 Origin of magnetic fields in materials
  17.2.2 Attributes of magnetism
  17.2.3 Magnetic properties of superparamagnetic beads
  17.2.4 Magnetophoretic forces
  17.2.5 DC magnetophoresis of spheres—linear limit
17.3 Digital microfluidics
  17.3.1 Electrowetting-on-dielectric
17.4 Summary
17.5 Supplementary reading
17.6 Exercises

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Copyright Brian J. Kirby. Please contact Prof. Kirby here with questions or corrections. This material may not be distributed without the author's consent. When linking to these pages, please use the URL http://www.kirbyresearch.com/textbook.

This web posting is a draft, abridged version of the Cambridge University Press text. Follow the links to buy at Cambridge or Amazon or Powell's or Barnes and Noble. Contact Prof. Kirby here.

Chapter 17Particle and droplet actuation: dielectrophoresis, magnetophoresis, and digital microfluidics

Chapter 17
Particle and droplet actuation: dielectrophoresis, magnetophoresis, and digital microfluidics