Method for preparing water-based Fe3O4 magnetic fluid

A magnetic fluid, water-based technology, used in magnetic liquids, manganese nitrate, etc., can solve the problems of poor biological compatibility, magnetic fluid containing organic substances, etc., and achieve the effects of good stability, simple operation and good water solubility.

Inactive Publication Date: 2008-07-02
HARBIN NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to provid...

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  • Method for preparing water-based Fe3O4 magnetic fluid

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specific Embodiment approach 1

[0007] Specific implementation mode one: water-based Fe in this implementation mode 3 o 4 The preparation method of magnetic fluid is as follows: one, FeCl 3 with FeCl 2 Dissolve in deionized water at a molar ratio of 2:1, and then use 37% HCl to adjust the pH value to 1 to 2; 2. In an oil bath at 120 to 180°C, under the protection of inert gas nitrogen or argon, Add NaOH solution with a concentration of 8-15mol / L dropwise to the solution in step 1 within 20-40 minutes, wherein NaOH and FeCl 3 The mol ratio is 3~10: 1, then with 1200~1800r / min speed insulation stirring 0.5~2.5 hours, naturally cool to room temperature; Ionized water, ultrasonically disperse until all the black solids are dissolved, settle the black solids with a permanent magnet, and pour off the upper liquid when the upper liquid is clear; 4. Repeat step 3 until the solution does not contain chloride ions and is neutral; 5. Ultrasonic disperse the solution treated in step 4 in deionized water of 1 to 3 ti...

specific Embodiment approach 2

[0010] Specific embodiment two: the difference between this embodiment and specific embodiment one is that NaOH and FeCl in step two 3 The molar ratio is 9:1, and the others are the same as in Embodiment 1.

specific Embodiment approach 3

[0011] Specific embodiment three: the difference between this embodiment and specific embodiment one is that NaOH and FeCl in step two 3 The molar ratio is 4: 1, and others are the same as the specific embodiment one.

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Abstract

The invention discloses a preparation method of water-based Fe3O4 magnetic fluid, which relates to a preparation method of water-based nano magnetic fluid with superparamagnetism. The invention solves the problem that the current magnetic fluid contains organic matter and has poor organism compatibility. The steps of the invention are that: FeCl3 and FeCl2 are dissolved in deionized water and pH value is adjusted; the mixture is heated in oil bathe at the temperature of 120-180 DEG C, NaOH is dripped in under the protection of inert gas and the mixture is insulated and mixed for 0.5-2.5h; deionized water cleaning and ultrasonic dispersion are carried out, permanent magnet is put into the solution to ensure the solution does not contain chloride and is neutral; the solution is subject to centrifugation after being dispersed by ultrasound; the solution is stirred, concentrated and refluxed at the speed of 300r/min for 3-6h at the temperature of 100-160 DEG C and under the protection of inert gas. The viscosity of the water-based Fe3O4 magnetic fluid prepared by the invention is less than 10mpa.s, particle size is between 3 and 10nm, saturation magnetization is more than 60emu/g and the water-based Fe3O4 magnetic fluid has superparamagnetism, good stability and water solubility, and the material is non-toxic and cheap. The method is simple, easy and suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a water-based nano-magnetic fluid with superparamagnetism. Background technique [0002] Nano magnetic fluid (abbreviated as magnetic fluid) is a stable magnetic colloidal solution, which is a new type of functional material formed by uniformly dispersing superparamagnetic nanoparticles in a carrier liquid after surface functionalization. In the absence of an external magnetic field, the superparamagnetic nanoparticles can be uniformly dispersed in the carrier liquid; in the presence of an external magnetic field, the superparamagnetic particles can be positioned and moved with the external magnetic field. At present, magnetic fluid has been widely used in lubrication, sealing, grinding, separation, printing, electronics, medicine, chemical industry and many other fields. [0003] In the more than 40 years of research and development of magnetic fluids, obtaining stable and dispersed magnetic nanopartic...

Claims

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Application Information

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IPC IPC(8): C01G45/08H01F1/44
Inventor 王红霞杨锐曹媛
Owner HARBIN NORMAL UNIVERSITY
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