Schematic illustration of the levitation position in a vertical bore of a large gradient field magnet. (a) Illustration of the magnetization force density in a vertical intersection and the relative positions of and . Point is the upper position, where the gravitational force is counterbalanced by the magnetization force ; Point is the positoin, which is at the center of the magnet, where there is no field gradient thus ; (b) Illustration of the magnetic field along the vertical axis; (c) distribution of the field-gradient product along the -axis. Point is another position, but steady levitation is not achievable, because any small position shift will cause the object to move upward (to position ) or downward (to the ground).
Schematic illustration of the containerless levitation setup installed in a superconducting magnet. (a) A photograph of the superconducting magnet. The magnet (JMT16T50mm, product of JASTEC, Inc.), capable of water levitation, is now installed in NPU (Northwestern Polytechnical University, China). (b) Configuration of the containerless levitation setup. It consists of a levitation unit, an observation unit, and a temperature control unit. The dashed curve indicates the distribution of the magnetization force line of the magnet. (c) A close look at the levitation unit.
Levitation process of a water droplet. [(a) and (b)] droplet attached to the needle; [(c) and (d)] droplet levitated. Note that in (a)–(c), the focus is adjusted to observe the needle tip; in (d), the focus is adjusted to observe the levitated droplet.
CCD holder for manual adjustment of the focus and aperture at outside of the magnet, while the CCD head remains in the magnet observing the levitated droplet. (a) A photograph of the holder. (b) Schematic illustration of the configuration for adjustment of the aperture. (c) Schematic illustration of the configuration for adjustment of the focus.
Schematic illustrations of different designs for the droplet illumination (upper), and the pictures taken at different illuminating designs (below). (a) The light source is a LED spot light placed below the droplet. (b) The light source are three LED spot lights placed below the droplet. (c) The light source is a plane light at the bottom of the levitation chamber. (d) The light source is a light ring place below the droplet. (e) The light source is a light ring place in a groove down outside of the levitation chamber. The light is guided by the organic glass tube to the droplet.
Schematic illustration of the temperature control unit. (a) Schematic illustration of the temperature control methodology. (b) A temperature control example. The desired temperature is . The results show that the temperature is controlled within .
Crystallization of lysozyme in a levitated and containerless state. [(a)–(d)] The growth process of the levitated lysozyme crystals.
The major specifications of the magnet.
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