Micrograph of the surface of ferrofluid, taken with episcopic lighting and Normarski Interference Contrast (DIC). Ferrofluids are colloidal liquids consisting of nanoscale ferromagnetic, or ferrimagnetic, particles suspended in a fluid, usually an oil. Each tiny particle is thoroughly coated with a surfactant to inhibit clumping. One application of ferrofluids is to keep dust off of the drive shafts of magnetic disk drives, which it does by creating a liquid seal held in place by magnetic fields. Object size; 0.5 mm.
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