Properties of diamagnetic fluid in high gradient magnetic fields

Abstract

This study focuses on the properties of diamagnetic fluid in static magnetic fields up to 8 T with the gradient of 50 T/m. We used a horizontal type of superconducting magnet with a bore 100 mm in diameter and 700 mm long. We observed the phenomenon that the surface of the water was pushed back by magnetic fields of higher gradients. Two ‘‘frozen’’ cascades were formed at z=±50–80 mm; the surface of the water near the center of the magnet was parted, and the bottom of the water chamber appeared. The water level at both ends of the chamber was lifted up. In order to investigate the hydrodynamics of diamagnetic fluid in magnetic fields, we made a fluidic circuit with plastic tubing which passed through the superconducting magnet’s bore. When magnetic fields in the center of the bore were changed from 0 to 8 T, the flow velocity of distilled water decreased, and the flow was stopped at 8 T. A stress analysis of diamagnetic fluid in magnetic fields was carried out to explain the mechanism of these phenomena. The hydrodynamics of diamagnetic fluid in ∼400 T2/m is able to compare with that of ferromagnetic fluid in weak magnetic fields. Studying the role of diamagnetic fluid in gradient magnetic fields is important in understanding the mechanism of biological effects of magnetic fields.