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[PPS07-28] Efficiency of material separation caused by magnetic field in outer space recognized for solid particles in general
Keywords:material separation, field gradient, diamagnetic anisotropy, paramagnetic anisotropy
The setup to observe the separation was installed in a wooden box that was attached to the top position of a drop shaft (length ~1.5 m). The duration of the microgravity condition was approximately 0.5 s. With the beginning of microgravity, the a carbon sample stage inside the stage-holder was levitated, which was effective in releasing the grains in a diffuse area; here the stage was spontaneously levitated by a small field gradient applied in the vertical direction. In previous studies, it was technically difficult to release a substance in a diffuse area in μg conditions. The separation of weak magnetic material was realized because the terminal velocity of the particles that translated in an area of B=0 was uniquely determined by the intrinsic susceptibility of the material and also by the field intensity at the initial sample position; the velocity was independent to mass of particle. This relationship was directly deduced from an energy conservation rule. The result achieved here is against the generally accepted notion that ordinary solid materials (i.e. diamagnetic and paramagnetic materials) are magnetically inert. In the diffuse conditions of outer space , the effectiveness of the field-induced separation would be more efficient because the effects of viscous drag, friction and gravity are negligible. Recently the mass independent property of magnetic translation was also confirmed for ferromagnetic and ferri-magnetic grains, namely in iron, nickel and ferrite. This means that proposed principle of material separation is confirmed for all categories of magnetic materials.
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