1. Ferrite Nanoparticles for Ferrofluids; Properties of Magnets Objectives: --Synthesize ferrimagnetic nanoparticle fluid --Observe differences in magnetic behavior between bulk magnets and nanoparticles

2. Examples of Nanotechnology ZnO nanowire UV lasers: 100 nm diameter

3. 100 nm Silicon Features

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

6. Types of Magnetism In Inorganic Compounds

7. Biomineralization of Ferrite Nanoparticles

9. 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

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