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[SGC54-05] Separation and non-destructive identification of diamagnetic paramagnetic particles using translational motion caused by magnetic field gradient in microgravity
Keywords:magnetic separation, non-destructive identification, microgravity, magnetic translational motion, diamagnetic, paramagnetic
Microgravity was generated using a short drop shaft. The length of the shaft is 1.8 m. The effective microgravity duration is about 0.5 seconds. The device for observing the translation was set in a box of 30 × 30 × 20 cm. The device consists of a small NdFeB magnetic circuit (B <0.8 T), vacuum chamber, lighting, battery and high speed camera. The inner pressure of vacuum chamber was reduced to ~100 Pa to eliminate the effect of air resistance.
An ensemble of heterogeneous particles was set at a position located in an area of monotonically decreasing field. The particles were composed of three diamagnetic materials and two paramagnetic materials were released in the microgravity space at the maximum value in the magnetic field gradient. Diamagnetic materials minerals translated out of the magnetic field, paramagnetic minerals translated in the magnet center direction. Particles were supplemented as different groups on a collection plate coated with two silicon greases set in both directions (YouTube: Magnetic separation of general solid particles realised by a permanent magnet). In addition, the magnetic susceptibility of each sample was found from the velocity of translational motion, which agreed with the published value, respectively .
So far, field-induced separation and extraction of solid is recognized in materials that bear spontaneous magnetization. The present results strongly indicate that the separation can be expanded to general solids using a hand magnet. The potential of this method as an analytical technique is comparable to that of chromatography separation because the extraction of new solid phases from a heterogeneous particle ensemble will lead to important discoveries about inorganic materials.
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