Has both fluid and magnetic properties often called ferrofluid. Ferrofluid grains carry a coating of the host liquid, which can be colored for water-based ferrofluids and hence the system may potentially be used to design a nozzle-free inkjet printer. For ferrofluid grains of typical diameter of about 100 Angstroms, the proposed system could lead one to develop inkjet printers with dot sizes that are less than 200 Angstroms and hence to a printing system of unparalleled resolution.
http://adsabs.harvard.edu/abs/2000APS..M…
Changing the alkali metal hydroxide used in the preparation of the starting material can significantly change the color of the ferrofluids. The use of Li, K, Rb, Cs and ammonium hydroxides instead of NaOH causes the ferrofluids to go from lighter to darker red through a significant shift in the optical absorption edge of the nanocrystalline ë-Fe2O3.
The optical transparency of the nanocrystalline ë-Fe2O3 along with the relatively high initial permeability, magnetization and stability of the ferrofluids also enables the existence of machine-usable colored magnetic inks at room temperature. To our knowledge, nanotechnology has been the only approach to successfully provide simultaneous color and magnetism in the same material at room temperature.
http://docs.google.com/viewer?a=v&q=cach… [ http://answers.yahoo.com/question/index?qid=20110503101836AACnAiu ]
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