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Method for visualizing complex magnetic field

A magnetic field and complex technology, applied in the field of visualization of complex magnetic fields, can solve the problems of easy agglomeration, non-uniform size of colloidal nanocrystal clusters, and inability to reuse, and achieve the effect of low cost, high sensitivity and high resolution

Active Publication Date: 2020-12-11
SUZHOU UNIV
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Problems solved by technology

[0007] The disadvantages of the above-mentioned existing magnetic-responsive photonic crystal detection magnetic field technology: colloidal nanocrystal clusters (CNC) are not uniform in size and easy to agglomerate, and this method can only detect the magnetic field strength (Scientific Reports, 2015, 5, 17063); The magnetic graphics card of commercial products can only observe black and white, and cannot observe more details; and the magnetic graphics card can only observe the static magnetic field and cannot be reused

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preparation example Construction

[0045] The present invention also provides a method for preparing the above-mentioned magnetic monodisperse particles, comprising the following steps:

[0046] A) In the presence of a catalyst, add tetraethyl orthosilicate dropwise to the dispersion of the modified nanoparticles to react, and the iron-containing nanoparticles are non-spherical;

[0047] B) Calcining the reaction product obtained in step B) under a reducing atmosphere to obtain a magnetic substance;

[0048] C) Dispersing the magnetic substance in a solvent to obtain a colloidal crystal solution.

[0049]Wherein, the nanoparticles are selected from α-Fe 2 o 3 Nanoparticles or FeOOH nanoparticles, Ni(OH) 2 nanoparticles.

[0050] The α-Fe 2 o 3 Nanoparticles are prepared as follows:

[0051] Dissolve the water-soluble iron source compound and sodium dihydrogen phosphate in water, and conduct a heating reaction to obtain α-Fe 2 o 3 nanoparticles. The water-soluble iron source compound is selected from f...

Embodiment 1

[0103] 1. Fe 3 o 4 @SiO 2Synthesis of nanorods

[0104] 1.623g FeCl 3 ·6H 2 O was dissolved in 120 mL of deionized water, and the solution was heated to 90 °C for 4 h with magnetic stirring. Afterwards, the solution was centrifuged and washed three times, and the precipitate obtained by centrifugation, ie, FeOOH nanorods, was redispersed in water. A solution containing 270 mg of FeOOH nanorods was added to a polyacrylic acid sodium salt solution (prepared by mixing 64.8 mg of polyacrylic acid, 36 mg of sodium hydroxide, and 9 mL of deionized water), and stirred for twelve hours. After centrifugal washing, the modified FeOOH nanorods were redispersed in 30 mL of water. Then 180 mL of deionized water and 9 mL of 28% ammonia were added to the solution under sonication. Thereafter, 900 μL of tetraethyl orthosilicate (TEOS) was added every 30 minutes under magnetic stirring until the total amount of TEOS reached 9 mL. After continuing the reaction for 30 min, FeOOH@SiO was ...

Embodiment 2

[0110] 1. Ellipsoid Fe 3 o 4 @SiO 2 Synthesis

[0111] 0.85g FeCl 3 ·6H 2 O and 3.1 mg NaH 2 PO 4 It was sonicated in 120 mL of deionized water at room temperature, and then placed in an oven at 100°C for 48 hours. During this process, the solution gradually became cloudy, changing color from light yellow to dark red. Afterwards, the solution was centrifuged and washed three times, and the precipitate obtained by centrifugation, that is, the ellipsoidal α-Fe 2 o 3 Redisperse in water. Containing 50mgα-Fe under ultrasound 2 o 3 0.2 g of PVP was added to the aqueous solution (20 mL). After sonicating for 1 hour, it was stirred for over 2 hours, and centrifuged at 11000 rpm for 30 minutes to remove excess PVP in the solution. The centrifuged precipitate was redispersed in 6 mL of deionized water, and 40 mL of ethanol and 2 mL of ammonia water were added thereto under ultrasonication. Afterwards, 200 μL TEOS was added every half hour under magnetic stirring until the...

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Abstract

The invention provides a method for visualizing a complex magnetic field. The method comprises the following steps: dispersing magnetic monodisperse particles in a solvent, and packaging the particlesin a PDMS device to obtain a detection device; arranging the detection device on a magnetic field to be detected, and determining the direction and distribution of the magnetic field according to thecolor and pattern presented by the device, the magnetic monodisperse particles being magnetic nanoparticles of which the surfaces are coated with SiO2 layers. The magnetic nanoparticles are rod-shaped, ellipsoid-shaped, ball-column-shaped or sheet-shaped; and the magnetic material is one or more of Fe3O4 and Ni. By applying the prepared device containing the magnetic nanorod solution near a complex magnetic field, the direction and distribution of the complex magnetic field can be directly judged by naked eyes through colors and patterns, and the method is simple, convenient, non-toxic, low in cost, high in sensitivity, high in resolution ratio and capable of being repeatedly used.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a method for visualizing complex magnetic fields. Background technique [0002] The geomagnetic field is one of the important conditions for the evolution of life. In nature, birds, fish and other animals have the ability to detect the earth's magnetic field and use it for orientation and navigation. Although the magnetic field is invisible and intangible, human beings have never stopped exploring, learning and using the magnetic field. It was not until the 6th century BC that people realized the existence of magnetism. In the following centuries, people gradually learned how to use magnetic fields, the appearance of the compass ushered in the age of navigation, and electromagnetic power generation technology promoted the second industrial revolution. Today, the application of magnetism has expanded to various fields, such as information, transportation, medicine, security, ...

Claims

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Application Information

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IPC IPC(8): G01R33/02G01R33/032G01R33/10
CPCG01R33/02G01R33/032G01R33/10
Inventor 何乐李超然陈志杰李海
Owner SUZHOU UNIV
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