You are seeing Ask web results for Ferrofluid.
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Ferrofluid - Wikipedia, the free encyclopedia
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Make your own ferrofluid, or liquid magnet, which can be used with a magnet to change the liquid's density and to form spikes and other amazing shapes. ... A liquid magnet or ferrofluid is a colloidal mixture of magnetic particles (~10 nm in diameter) in a liquid carrier. The carrier contains a surfactant to prevent...
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Using a magnetic ink developer (MICR) seems to be the easiest way to make a smooth ferrofluid at home. Simply purchase a $19 bag of developer and add some veggie oil. Using a lower viscosity oil like kerosene or biodiesel along with a surfactant (citric acid, oleic acid, etc.) may improve the quality further.
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Procedure modified by Jonathan Breitzer and George Lisensky from "Preparation and Properties of an Aqueous Ferrofluid" by Patricia Berger, Nicholas B. Adelman, Katie J. Beckman, Dean J. Campbell, Arthur B. Ellis, and George C. Lisensky, J. Chem.
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Although the array of spikes on the surface of the ferrofluid is spectacular, this property is not particularly useful. However, ferrofluids have found a wide variety of applications, including use in rotating shaft seals.
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A magnet placed just below a dish containing ferrofluid generates an array of spikes in the fluid. The magnetic attraction is strong enough to hold a magnet in place and to prevent the "fluid" from escaping when the dish is tipped.
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Here, the ferrofluid's on a china plate, and the two flat hard drive magnets from the ForceField collection are under the plate (and stuck quite firmly to it by their attraction to the fluid). The drive magnets have a very intense field close to their surface, so the spikes are tiny.
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