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| - Typical ferrofluid compositions are described, for example, in U.S. Pat. No. 3,700,595, (1972), wherein anionic surfactants, such as fatty acids, alcohols, amines or amides and other organic acids are employed as dispersing surface active agents; U.S. Pat. No. 3,764,504, (1973), wherein aliphatic monocarboxylic acids are employed as dispersing agents; U.S. Pat. No. 4,208,294, (1980), wherein a wat
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