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Preparation method of trimanganese tetroxide nanoparticles with magneto-optical double functions

A nanometer, bifunctional technology of manganese tetroxide, applied in chemical instruments and methods, manganese oxide/hydroxide, luminescent materials, etc., can solve the problem of magneto-optical bifunctional nanoparticle methods and ligand exchange methods Low efficiency, unstable solubility of nanoparticles, etc., to achieve the effect of fluorescence not easily quenched, magnetic stability, and low price

Inactive Publication Date: 2010-04-14
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coated with organic polymers, it is easy to cause particle agglomeration, and the solubility of nanoparticles is unstable
Ligand exchange method is time inefficient and complicated to prepare
After the magnetic nanoparticles prepared by the above-mentioned prior art are connected with luminescent materials, the most obvious disadvantage is that it is easy to cause the fluorescence quenching of the fluorescent ligands attached to the surface, which makes it difficult to achieve the purpose of magneto-optical dual function.
The disadvantages of the magneto-optic dual-functional nanoparticles prepared by the prior art are: 1. only have magnetic properties, and the optical properties are not stable; 2. the fluorescence of the luminous body is easily quenched
[0006] After extensive retrieval of domestic and foreign patent documents and publications, there is no method for preparing magneto-optical dual-functional nanoparticles identical to the present invention.

Method used

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  • Preparation method of trimanganese tetroxide nanoparticles with magneto-optical double functions
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  • Preparation method of trimanganese tetroxide nanoparticles with magneto-optical double functions

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Preparation of manganese acetylacetonate precursor.

[0044] Weigh MnCl 2 4H 2 O (1.979 grams, 10 mmoles) was dissolved in 10 milliliters of water; Then, 4.1 milliliters, 40 millimoles of acetylacetone were added to the above-mentioned solution; Stirred at room temperature for 15 minutes; Then, 3 milliliters of triethylamine was added to the solution, and the reaction solution A yellow precipitate appeared in the solution, and the precipitate was extracted and filtered.

[0045] Prepare 20 ml of ethanol and water mixed solution with a volume ratio of 8:2, add the yellow solid obtained by extraction and filtration into the mixed solution of ethanol and water, stir at 70°C until completely dissolved; then cool at room temperature, and the solution will produce a yellow color Needle-like crystals, filtered; yellow needle-like crystals of manganese acetylacetonate precursor.

Embodiment 2

[0047] Preparation of surface oleylamine coordinated oil-soluble manganese tetraoxide nanoparticles.

[0048] Get 0.30 g of the manganese acetylacetonate precursor obtained in Example 1, 1.19 mmol, dissolve it in 7.61 g, 28.44 mmol of oleylamine, put it into a 100 ml three-necked flask, vacuumize, and stir magnetically in a nitrogen atmosphere , quickly heated to 170°C, and reacted at constant temperature for 12 hours; cooled to room temperature and then centrifuged; the separated substance was washed continuously with absolute ethanol for 5 times; vacuum dried; the brown substance was obtained, which was the surface oleylamine coordination oil-soluble tetroxide Trimanganese nanoparticles.

Embodiment 3

[0050] Prepare silica-coated water-soluble trimanganese tetraoxide nanoparticles with a large number of amino groups on the surface.

[0051] Weigh 2.8 grams of surfactant 6.0 mmol α-(4-nonylphenyl)-ω-hydroxyl-poly(oxidized-1,2-ethylene) surfactant (Igepal CO-520) into 50 ml beaker, add 30 ml cyclohexane, ultrasonically dissolved. The oil-soluble manganese trimganese tetraoxide nanoparticles prepared in Example 2 were prepared into 150 microliters of a cyclohexane solution with a concentration of 55 milligrams per milliliter. Mix the two solutions, ultrasonically dissolve them evenly, put them into a 250 ml Erlenmeyer flask, add 200 microliters of concentrated ammonia water, 190 microliters of tetraethyl orthosilicate (TEOS), 55 microliters of 3-aminopropyl- Triethoxysilane (APS), stirred at room temperature for 12 hours, centrifuged, washed 4 times with ethanol and water respectively, to obtain water-soluble manganese tetraoxide nanoparticles coated with silicon dioxide and ...

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Abstract

The invention relates to a preparation method of trimanganese tetroxide nanoparticles with magneto-optical double functions, which belongs to a preparation method of nanoparticles with magneto-optical double functions. The magneto-optical double functional nanoparticles prepared in the prior art has the defects of unstable optical property and easy quenching of fluorescence of luminants. The preparation method comprises the following steps: preparing a manganese acetylacetonate precursor; preparing oil soluble trimanganese tetroxide nanoparticles with surfaces having oleyl amine for coordination; preparing cyclohexane solution; preparing water soluble trimanganese tetroxide nanoparticles coated by silicon dioxide, wherein the surfaces of the water soluble trimanganese tetroxide nanoparticles have a great deal of amino groups; and preparing water soluble trimanganese tetroxide nanoparticles with the magneto-optical double functions. The invention has the advantages that the nanoparticles have stable magnetism, good luminous performance and difficultly quenched fluorescence; the preparation device is simple; the prepared particles have uniform grain diameter, good dispersity and good water solubility; the raw materials are easily obtained and have low cost; the operation is simple; and no pollution to the environment is generated.

Description

technical field [0001] The invention belongs to a preparation method of magneto-optical double-functional nanoparticles, in particular to a preparation method of trimanganese tetraoxide nano-particles with magneto-optical double functions. Background technique [0002] Magnetic materials and luminescent materials are two functional materials with a long history and a wide range of uses. They are closely related to the development of modern science and technology, as well as various fields of informationization, automation, mechatronics, national defense and national economy. Magnetic materials refer to substances that can directly or indirectly generate magnetism from elements such as iron, cobalt, nickel, manganese and their alloys. Magnetic materials are divided into two categories: "metal and alloy magnetic materials" and "ferrite magnetic materials"; ferrite magnetic materials are further divided into two types: polycrystalline structure and single crystal structure mate...

Claims

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Application Information

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IPC IPC(8): H01F1/11C01G45/02C09K11/06
Inventor 杨仕平庄业明杨红胡鹤
Owner SHANGHAI NORMAL UNIVERSITY
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