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PVP coated magnetic nano particle and its preparation method and application

A technology of magnetic nanoparticles and molecular weight, applied in the fields of magnetic materials science and material science, which can solve the problems of rare reports and blanks.

Inactive Publication Date: 2008-02-13
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, about K x m II y [Cr III (CN) 6 ] z (M II = Fe II ,Co II ) reports on molecular-like magnet nanoparticles are rare, and the reports on the size effect of such magnets are almost blank

Method used

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  • PVP coated magnetic nano particle and its preparation method and application
  • PVP coated magnetic nano particle and its preparation method and application
  • PVP coated magnetic nano particle and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: the preparation of Fe100

[0028] Among the present invention Fe50 and Co50, the concrete preparation method of Fe100 and Co100 is somewhat the same, taking Fe100 as example, the steps are as follows:

[0029] 1) Add 0.1mmol FeCl 2 4H 2 O is mixed with 10.0mmol of PVP calculated as a monomer and then added to 40mL of water to prepare a clear solution;

[0030] 2) Add 0.1mmol K 3 [Cr(CN) 6 ]·2H 2 O was made into 10mL aqueous solution and added to the above aqueous solution and stirred evenly;

[0031] 3) Place the solution obtained above in a dry, cool dark place for three to four days, wash the obtained precipitate with acetone three to four times, centrifuge, put in a vacuum desiccator, and dry for two to three days to obtain the target product.

Embodiment 2

[0032] Embodiment 2: the preparation of Fe50

[0033] 1) Add 0.1mmol FeCl 2 4H 2 O is mixed with 5.0mmol of PVP calculated as a monomer and then added to 40mL of water to prepare a clear solution;

[0034] 2) Add 0.1mmol K 3 [Cr(CN) 6 ]·2H2 O was made into 10mL aqueous solution and added to the above aqueous solution and stirred evenly;

[0035] 3) Place the above obtained solution in a dry, cool dark place for three to four days, wash the obtained precipitate with acetone three to four times, centrifuge, put in a vacuum desiccator, and dry for two to three days to obtain the target product.

Embodiment 3

[0036] Embodiment 3: the preparation of Co50

[0037] 1) 0.1mmol CoCl 2 ·6H 2 O is mixed with 5.0mmol of PVP calculated as a monomer and then added to 40mL of water to prepare a clear solution;

[0038] 2) Add 0.1mmol K 3 [Cr(CN) 6 ]·2H 2 O was made into 10mL aqueous solution and added to the above aqueous solution and stirred evenly;

[0039] 3) Place the above obtained solution in a dry, cool dark place for three to four days, wash the obtained precipitate with acetone three to four times, centrifuge, put in a vacuum desiccator, and dry for two to three days to obtain the target product.

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Abstract

The present invention relates to a PVP-coated magnetic nanoparticle, the preparation method and the application. The PVP-coated magnetic nanoparticles has the following chemical composition: KxMIIy [CrIII (CN) 6] z question mark nH2O question mark mPVP. Therein, the MII is FeII or CoII; PVP is the polyvinylpyrrolidone. The PVP-coated magnetic nanoparticle has the obvious size effectL with the increase of the content of the polymer surfactant, the size of the nanoparticle is gradually decreased; the magnetism has the dramatic changes. The present invention has the wide prospects to broaden the reorganization of people for the Prussian blue molecular magnet, to prepare and use the novel magnetic material.

Description

technical field [0001] The invention relates to the field of material science, in particular to a polymer-coated K x m II y [Cr III (CN) 6 ] z The invention discloses spherical nanoparticles of molecular magnets and a preparation method thereof, which can be used in the field of magnetic materials science. Background technique [0002] Magnetic properties of nanoparticles are currently studied extensively due to their promising applications in new information storage materials. In the field of nanoparticles, due to the size effect of nanoparticles, controlling the size of nanoparticles plays a very important role in mastering and controlling their magnetic properties. For example, reducing the size of iron nanoparticles to a critical size, the type of magnetic interaction will undergo a transition from ferromagnetic to superparamagnetic. Because Prussian blue molecular magnets have some excellent magnetic properties, such as room temperature molecular magnets, magneto...

Claims

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Application Information

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IPC IPC(8): C09C3/10C09C1/00H01F1/06
Inventor 程鹏张明
Owner NANKAI UNIV
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