Ferrofluid - Colloidal Suspension of Magnetite Nanoparticles Fully Dispersed in Water
Virginia Commonwealth University Atomic Engineering lab. This ferrofluid is
a colloidal suspension of magnetite nanoparticles fully dispersed in DI-H20.
This type of ferrofluid is known as a smart nanomaterial. In the 60's NASA was
the first to characterize these types of "smart fluids" and now you
may find them in various mechanical devices, such as loud speakers, bearings
(audi TT) dampers and sensors. You can even find them on your dollar bill. If
you hold a magnet to the end of a dollar bill you will notice a slight attraction.
The government started using ferro-inks a few years back. The ferrofluid in
this video is of particular interest because of the fact that it is fully dispersed
in water. Most ferrofluids are oil-based or use certain surfactants which are
limited in their biomedical applications.
Run time 2.36 mins