Ferrite Nanoparticles for Ferrofluids; Properties of Magnets Objectives: --Synthesize ferrimagnetic nanoparticle fluid --Observe differences in magnetic.

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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

Examples of Nanotechnology ZnO nanowire UV lasers: 100 nm diameter

100 nm Silicon Features

Ferrite (Magnetite), Fe 3 O 4 --Spinel structure: Fe coordinated by 4 or 6 oxygen atoms --Compass needle of ancient world: “lodestone” --Ferrimagnetic

Types of Magnetism In Inorganic Compounds

Biomineralization of Ferrite Nanoparticles

Ferrite Nanoparticle Synthesis --Mixture of Fe +3 and Fe +2 in H 2 O: provides O for oxide formation --HCl: solvates iron chlorides, prevent rapid precipitation of oxide --Hydrolysis/condensation reactions, catalyzed by water --NH 3 scavenges Cl - ligands: NH 4 + Cl - Behavior of nanoparticle magnetic domains within fluid vs. bulk magnetic solids

Experimental --Add sufficient FeCl 2 --REMOVE ALL LIQUID from reaction mixture --DO NOT ADD too much surfactant. <1 ml to start.

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