Feb 3rd, 2012
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Stanford University
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Sedimentation occurs under the action of gravitational field and magnetic field gradients. Agglomeration occurs mainly by two mechanisms: magnetic dipole-dipole interaction, and electrostatic London- type Van der Waals attractive forces. The thermal agitation energy (KBT) can overcome the mentioned mechanisms under certain conditions, except the Van der Waals forces. To solve this problem, the particles are coated with a dispersion layer, commonly called surfactant, like oleic acid.

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