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Ferrofluids

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Tiny iron particles covered with liquid coating. ... Lose their magnetic properties at high temperatures, known as the curie temperature. ... – PowerPoint PPT presentation

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Title: Ferrofluids


1
Ferrofluids
  • By Eduardo Hernandez

2
Description
  • Developed by NASA??
  • Composed of magnetite, hematite, or other
    compound containing iron.
  • Tiny iron particles covered with liquid coating.
  • Surfactant added to water or oil, which gives
    liquid properties.
  • Has more than one state of matter (colloidal
    suspensions).
  • Lose their magnetic properties at high
    temperatures, known as the curie temperature.

3
How they work
  • Prepared by combining appropriate amounts of an
    Fe(II) salt and an Fe(III) salt in basic
    solution.
  • Particles of magnetite must remain small to
    remain suspended in liquid medium.
  • To keep them small a surfactant is added to the
    liquid medium.
  • Surfactant is a long-chain hydrocarbon that is
    attracted to the surface of magnetite particle.
  • Surfactant is used as a repellent cushion and
    prevent approach of other magnetite particles.

4
Applications
  • Rotating Shaft seals (liquid O-ring)
  • Magnetic particles form a barrier which prevents
    debris from entering the interior.
  • Performance of loudspeakers
  • Provides heat conduction from voice coil to the
    surrounding assembly providing better sound
    quality .
  • Biomedical applications
  • Researchers attempting to design ferrofluids that
    can carry medications to specific locations in
    the body using magnetic fields.

5
References
  • http//en.wikipedia.org/wiki/Ferrofluid
  • http//mrsec.wisc.edu/Edetc/background/ferrofluid/
    index.html
  • http//engineeringtv.com/blogs/etv/archive/2008/07
    /17/ferrofluids.aspx
  • http//commons.wikimedia.org/wiki/Ferrofluids
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