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Method for producing magnetic fluid

A magnetic fluid and magnetic nanotechnology, applied in the field of magnetic nanocomplex with high degree, can solve the problems of low saturation magnetization and shedding of ferrite, and achieve the effects of good biocompatibility, not easy to fall off, and high stability.

Inactive Publication Date: 2008-03-05
SUZHOU UNIV
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Problems solved by technology

However, the defect of this method is that the composite of dextran and ferrite utilizes van der Waals force and hydrogen bonding. Usually, at a slightly higher temperature or in the process of washing with water, part of the dextran will automatically fall off, and the ferrite The saturation magnetization of the body is not high, etc.

Method used

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  • Method for producing magnetic fluid
  • Method for producing magnetic fluid
  • Method for producing magnetic fluid

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Embodiment approach

[0021] Typical implementation: dextran oxidation is to dissolve 3.33g dextran in 100mL deionized water, add 8g sodium periodate, stir at room temperature in the dark for 3h, the reaction is completed, deionized water is dialyzed once every 2h, dialyzed five times . After the reaction, the dextran aldehyde was tested with 2,4-dinitrophenylhydrazine, and the oxidation efficiency of dextran was calculated by titration

[0022] FeCl 3 and FeSO 4 Mix in a ratio of 1.75:1 and add a small amount of hydrazine hydrate to it. Ultrasonic degassing for 30 minutes, then quickly add 10mL of analytically pure ammonia water under vigorous stirring, after stirring for 15 minutes, slowly add ammonia water dropwise to adjust the pH value to 9, continue to react for 30 minutes, let stand for one day, magnetically separate, wash with deionized water several times, After drying, ferric oxide nanometer powder is obtained.

[0023] A certain concentration of Mn 2+ , Zn 2+ , Fe 3+ Mix the solut...

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Abstract

This invention relates to a preparation method for magnetic fluid characterizing in selecting FeCl3 and ferrous sulfate as the source, taking ammonia as the precipitator and adding small amount of hydrazine hydrate to react for a period of time under normal temperature to prepare a product to be filtered, washed and dried and added into a Mn2+, Zn2+ and Fe3+ solution with the concentration of 0.1-0.5mol / L to be bathed and heated in oil and added with NaOH solution to be reacted and aged for 2-3 days, pH value is adjusted and washed with deionized water to neutral to be dried to become a nm compound powder with soft and hard magnetism, which is mixed with a surface modifier and a solvent to be reacted for 4-9h, then reacted under acid and alkali conditions with glucan aldehyde to be recovered with reducer to get magnetic nm compound particles wrapped with glucan aldehyde to get magnetic fluid of high stability by dispersing the particles and surfactant in water.

Description

technical field [0001] The invention relates to a nanocomposite powder combining soft and hard magnetism firstly, and then using chemical reaction method to modify the surface of the magnetic nanocomposite powder, so as to obtain a magnetic nanocomposite powder with surface biological activity and high saturation magnetization. Nanocomposite particles, and dispersing the composite particles in water to prepare a magnetic fluid with high stability and good biocompatibility. Background technique [0002] The rapid development of nanotechnology over the past decade has made it an integral part of biomedical applications and diagnostics. Among inorganic nanoparticles, magnetic nanoparticles (including Fe 3 o 4 , γ-Fe 2 o 3 , Mn 1 - x Zn x Fe 2 o 4 etc.) have attracted great attention since the biocompatibility of these magnetic particles has been demonstrated. [0003] With the rapid development of nanotechnology and molecular biology, the research on the application o...

Claims

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Application Information

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IPC IPC(8): H01F1/44H01F41/02
Inventor 洪若瑜陈莉莉
Owner SUZHOU UNIV
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