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Shubhi Sahni

on 17 April 2014

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Transcript of Ferrofluids

Made up of nanoscale particles of usually magnetite
Sometimes made up of hematite or another compound with iron
's chemical formula: Fe3O4
's chemical formula: Fe2O3

Unique Chemical Composition
The Nanoworld of Tomorrow: Ferrofluids
Superb Structure
Full: 1s2 2s2 2p6 3s2 3p6 4s2 3d6
Condensed: [Ar] 4s2 3d6
Electron Configuration of Iron

Magnetite is the precipitate formed from basic solution with an Fe(II) salt and an Fe(III) salt
2 FeCl3 + FeCl2 + 8 NH3 + 4H2O ->
+ 8 NH4Cl
Octahedral or dodecahedral structure
Tetrahedral VSEPR shape

More on Magnetite
Ferrofluids are currently used as vacuum seals to protect disk drives
They have replaced the archaic O-ring they can act as liquid O-ring seals which magnets hold in place
This technology is applicable to many items such as: ion implantation, wafer handling, diffusion, atomic layer deposition (ALD), vacuum deposition
Researchers in the biomedical field have found that:
Ferrofluids can be used to distribute medication to different parts of the body through a magnetic field
Ferrofluids can be used as contrast agents for magnetic resonance imaging (MRI)
Current and
Prospective Uses
: Liquid
: Black
: Mild
: Opaque
Vapor Density
: 6.4
: Extremely low in water at 20°C
Unique Property
: “Spiking” (sharp peaks in the fluid) with exposure to a magnetic field
: Stable
Unique Property
: Magnetic

: 401-491°F

Physical & Chemical Properties
Ferrofluids have a very small negative effect on the environment
As they are liquid, there is no resulting mechanical friction and thus no emmisions
They are far more ecologically efficient than other technology used for the same purposes
Only some ferric fluids such as ferric chloride are harmful. For example, ferric chloride is harmful to fish
Environmental Impact
Ferrofluid. (n.d.). HMS Beagle. Retrieved March 23, 2014, from http://www.hms-beagle.com/MSDS/Ferrofluid.pdf

Ferrofluid Fun. (n.d.). Physics Central. Retrieved March 23, 2014, from http://www.physicscentral.com/explore/action/ferrofluids.cfm

Ferrofluid Seals. (n.d.). S&D Materials, LLC.: Magnetic seal, ferrofluid seal, rotating seal; high-vacuum seal; new, rebuilt. Retrieved March 23, 2014, from http://www.sdmaterials.com/ferrofluid_seal

Magnetite: mineral information and data.. (n.d.). Mindat.org. Retrieved March 23, 2014, from http://www.mindat.org/min-2538.html

Observation of the Unusual Properties of Ferrofluids. (n.d.). Observation of the Unusual Properties of Ferrofluids. Retrieved March 23, 2014, from http://addis.caltech.edu/teaching/MS90/lab4-prt1.htm

University of Wisconsin-Madison Materials Research Science and Engineering Center Interdisciplinary Education Group. (n.d.). Ferrofluids. Retrieved March 23, 2014, from http://education.mrsec.wisc.edu/background/ferrofluid/
Full transcript