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Ferrofluids were originally developed and classified in the 1960s by Stephen Pappell at NASA as a method for controlling fluids in space. NASA initially used them as rotating shaft seals in satellites and are now being used to serve the same purpose in a variety of machines.
http://mimp.materials.cmu.edu/hst/Projects/2005/2005bill/Introduction.htm
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magnetic repulsion
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Ferrofluids were discovered in 1960's at NASA Research Centre. Scientists were exploring various techniques to control liquids in space when the solution in the form of a new idea of magnetic fluid emerged. It was found that its location can be changed by applying magnetic field and magnetic field strength can be used to induce fluidity. Researchers have used ferromagnetic compounds(Cobalt, Iron) and magnetic materials(manganese zinc ferrite) in making ferrofluids. But the maximum research until today has been done on the ferrofluids containing magnetite.
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