Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53697#.VM85jyzQrzE Author(s) I. Medvedeva 1,2* , Iu. Bakhteeva 1 , S. Zhakov 1 , A. Revvo 2 , M. Uimin 1 , A. Yermakov 1 , I. Byzov 1 , A. Mysik 1 , N. Shchegoleva 1 Affiliation(s) 1 Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia . 2 Ural State Mining University, Ekaterinburg, Russia . ABSTRACT Sedimentation dynamics of magnetite ( γ -Fe 3 O 4 ) nanopowders (10 - 20 nm) in water in the presence of a gradient magnetic field was studied by optical and Nuclear Magnetic Resonance (NMR) relaxometry methods. The magnetic field B ≤ 0.3 T, dB/dz ≤ 0.13 T/cm was produced by the system of permanent strip magnets. The initial sedimentation rate of the nanoparticles in water and under magnetic fields is higher for less concentrated suspensions (c 0 = 0.1 g/l) than for more concentrated ones (c 0 = 1 g/l)....
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