Ferrite Nanoparticles for Ferrofluids

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Ferrite Nanoparticles for Ferrofluids Properties
of Magnets
Objectives --Synthesize ferrimagnetic
nanoparticle fluid --Observe differences in
magnetic behavior between bulk magnets and
nanoparticles
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Examples of Nanotechnology
ZnO nanowire UV lasers 100 nm diameter
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100 nm Silicon Features
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100 nm Silicon Features
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Ferrite (Magnetite), Fe3O4
--Spinel structure Fe coordinated by 4 or
6 oxygen atoms --Compass needle of ancient
world lodestone --Ferrimagnetic
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Types of Magnetism In Inorganic Compounds
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Biomineralization of Ferrite Nanoparticles
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Biomineralization of Ferrite Nanoparticles
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Ferrite Nanoparticle Synthesis
--Mixture of Fe3 and Fe2 in H2O provides O for
oxide formation --HCl solvates iron chlorides,
prevent rapid precipitation of oxide --Hydrolysis
/condensation reactions, catalyzed by
water --NH3 scavenges Cl- ligands NH4Cl-
Behavior of nanoparticle magnetic domains within
fluid vs. bulk magnetic solids
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Experimental
--Add sufficient FeCl2
--REMOVE ALL LIQUID from reaction mixture
--DO NOT ADD too much surfactant. lt1 ml to start.