Ferrofluids: fluid properties of a liquid and the magnetic properties of a solid.Developed by NASA Research Center in the 1960s.Small particles of magnetite suspended, e.g., in mineral oil.Small amount of oleic acid added to help prevent agglomeration of particles.Illustration of hydrophobic and hydrophilic interactions.Reverse micelle structure; iron oxide particles in the center with the polar end of the oleic acid pointed towards the particles.Application: "liquid O-ring" for ultracentrifuge
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in oil