ENGRI111_24_magneticsIV

ENGRI111_24_magneticsIV - ENGRI 111 Magnetics IV...

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ENGRI 111 ENGRI 111 Magnetics - IV Magnetics - IV Ferrofluids
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Ferrofluids Ferrofluids Magnetic material Spontaneously magnetized Fluid Flow or assume shape of container Such a fluid could change its orientation and position in response to a magnetic field
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R. Rosenweig, Scientific American, Oct 1982, 136
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en.wikipedia.org
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Ferrofluid Seal Ferrofluid Seal www.roymech.co.uk/. ../Seals/Rotary_Seals.html Liquid O-ring for vacuum chamber Ferrofluid is held in place by permanent magnets and forms a tight seal eliminating the friction of solid seals
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History History Magnetic clutch Application of magnetic field causes the clutch fluid to congeal NASA – 60s manipulate liquids in space
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Ferrofluids/Background Ferrofluids/Background Sufficiently small particles can remain suspended in a liquid even if their density is higher from the liquid Particles kept from settling because of collisions with liquid molecules Energy per particle is kT k: Boltzmann’s constant, T: temperature Thermal energy greater than gravitational energy needed to raise the particles
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ENGRI111_24_magneticsIV - ENGRI 111 Magnetics IV...

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