Reagent and method for measuring magnetic field intensity by using magneto discoloration

Abstract

The invention provides a reagent and a method for measuring magnetic field intensity by using magneto discoloration. The reagent is a three-phase material system consisting of superparamagnetic nano colloid clusters (CNCs), liquid solvent, and a liquid resin; each CNCs consists of a plurality of single-domain Fe3O4 magnetic nanoparticles coated by silicon dioxide; the method comprises the following steps that: 1, the reagent is placed in an external magnetic field, the magnetic attraction caused by the superparamagnetic nano colloid clusters, and electrostatic repulsion and solvating power are leveled off under the action of the magnetic field so as to form chain structures along a magnetic line of force, and a large number of chain structures are uniformly distributed so as to form photonic crystal; and 2, the lattice constant of the photonic crystal determines the color of diffraction beams, different colors of the reagent are displayed according to different magnetic field intensities, and the corresponding magnetic field intensity can be obtained by looking up a color-magnetic field intensity comparison table according to the corresponding relation between the color and the magnetic field intensity.

Description

Technical field [0001] The invention relates to a reagent and method for measuring magnetic field strength, in particular to a reagent and method for measuring magnetic field strength by using magnetochromism. Background technique [0002] In current engineering applications and scientific research, it is often necessary to measure the magnitude of the magnetic field strength. For the DC magnetic field (steady magnetic field) that does not change with time, there are currently 7 commonly used measuring instruments: torque magnetometer, fluxmeter and impact Galvanometers, rotating coil magnetometers, fluxgate magnetometers, Hall effect magnetometers, nuclear magnetic resonance magnetometers and magnetometers. [0003] Torque magnetometer: referred to as magnetometer. Use the force effect of a magnetic field to measure the strength of a magnetic field or the magnetization of a material. [0004] Fluxmeter and impact galvanometer (see galvanometer): used to measure magnetic flux and m...

AI Technical Summary

Problems solved by technology

The prepared magnetic microspheres are mostly a single magnetic particle or a few particles coated with silicon oxide. The advantage of this preparation method is that the microspheres are monodispersed and the thickness of the silicon oxide shell is controllable. The disadvantage is that the content of magnetic substances in the microspheres Very low (<10wt%), the saturation magnetization is only 7.5emu / g, too low saturation magnetization is not conducive to improving the enhancement effect of magnetic microspheres on proton relaxation, it is difficult to meet the needs of magnetic resonance enhanced imaging

If the concentration of magnetic nanoparticles in the reactant is increased, the number of coated particles in the microspheres will increase, and the morphology of the magnetic microspheres will become irregular again, and the particle size is very uneven, which cannot meet the application requirements.

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