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

A magnetic field strength and reagent technology, which is applied in the field of reagents for measuring magnetic field strength using magnetochromism, can solve the problem that the saturation magnetization is not conducive to improving the effect of magnetic microspheres on proton relaxation enhancement, and it is difficult to meet the requirements of magnetic resonance enhanced imaging and magnetic microspheres. Irregular shape and other problems, to achieve the effect of wide application potential, intuitive observation, and low production cost

Inactive Publication Date: 2011-06-29
中国印刷科学技术研究所
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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

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

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[0043] The technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0044] figure 1 A schematic diagram of the structure of a test paper formed by sealing and packaging the reagent for measuring the magnetic field strength of the present invention into a colorless and transparent material such as a plastic film.

[0045] The present invention provides a reagent 1 for measuring magnetic field strength by using magnetochromism, that is, a three-phase composed of superparamagnetic nanocolloid clusters 11 (CNCs), liquid solvent 12 (alcohol solvents such as ethanol), and liquid resin 13 Material system. Each CNCs11 is covered by silicon dioxide with multiple single domain Fe 3 O 4 Composition of nanoparticles. When there is no external magnetic field, CNCs11 are randomly dispersed in the liquid resin 13, showing a brown color, which is also the inherent color of Fe3O4.

[0046] The above three-phas...

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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...

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Application Information

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IPC IPC(8): G01R33/02
Inventor 何文褚庭亮蒋小珊汤文杰
Owner 中国印刷科学技术研究所
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