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Water-based magnetic liquid and method for making same

A magnetic liquid, water-based technology, applied in the fields of magnetic liquid, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problems of low efficiency and weak magnetic properties of water-based magnetic liquid, and achieve good economic and social benefits, The effect of broadening the scope of application

Inactive Publication Date: 2005-11-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current disadvantage is that the magnetic properties of these water-based magnetic liquids are weak and the efficiency is not high.

Method used

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  • Water-based magnetic liquid and method for making same
  • Water-based magnetic liquid and method for making same
  • Water-based magnetic liquid and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] FeCl 3 ·6H 2 O is made into an aqueous solution with a mass concentration of 66.6%, and FeSO 4 ·7H 2 O is formulated into 21.9% aqueous solution, press Fe 2+ : Fe 3+ =1:1.5~2 Mix the two solutions to form a mixed solution of iron salt. The mass ratio of carboxymethyl chitosan to 25% ammonia water is within the range to form a solution, carboxymethyl chitosan and 25% The mass ratio of ammonia water is 1:5. Stir the carboxymethyl chitosan in ammonia water at a high speed under the condition of about 90℃ in a water bath while injecting Fe 2+ , Fe 3+ Mixture, control carboxymethyl chitosan and Fe after synthesis 3 O 4The quality is 1:1, the reaction time is controlled at about 30 minutes, the stirring speed at the initial stage of the reaction is 1200 revolutions / minute, and the stirring speed at the end of the reaction is 650 revolutions / minute. After the reaction, the magnetic liquid is taken out and centrifuged to separate unstable particles to obtain a stable magnetic liqui...

Embodiment 2

[0028] FeCl 3 ·6H 2 O is made into an aqueous solution with a mass concentration of 66.6%, and FeSO 4 ·7H 2 O is formulated into 21.9% aqueous solution, press Fe 2+ : Fe 3+ =1:1.5~2 Mix the two solutions to form a mixed solution of iron salt. The mass ratio of carboxymethyl chitosan to 25% ammonia water is within the range to form a solution, carboxymethyl chitosan and 25% The mass ratio of ammonia water is 1:10. Stir the carboxymethyl chitosan in ammonia water at a high speed under the condition of about 90℃ in a water bath while injecting Fe 2+ , Fe 3+ Mixture, control carboxymethyl chitosan and Fe after synthesis 3 O 4 The quality is 2:1, and the reaction is carried out under nitrogen protection, and the reaction time is controlled at more than 2 hours. The stirring speed at the initial stage of the reaction is 1200 revolutions / minute, and the stirring speed at the latter stage of the reaction is 650 revolutions / minute. After the reaction, the magnetic liquid is taken out and c...

Embodiment 3

[0030] FeCl 3 ·6H 2 O is made into an aqueous solution with a mass concentration of 66.6%, and FeSO 4 ·7H 2 O is formulated into 21.9% aqueous solution, press Fe 2+ : Fe 3+ =1:1.5~2 Mix the two solutions to form a mixed solution of iron salt. The mass ratio of carboxymethyl chitosan to 25% ammonia water is within the range to form a solution, carboxymethyl chitosan and 25% The mass ratio of ammonia water is 1:15. Stir the carboxymethyl chitosan in ammonia water at a high speed under the condition of about 90℃ in a water bath while injecting Fe 2+ , Fe 3+ Mixture, control carboxymethyl chitosan and Fe after synthesis 3 O 4 The quality is 3:1, and the reaction is carried out under nitrogen protection and ultrasonic conditions, and the reaction time is controlled at more than 2 hours. The stirring speed at the initial stage of the reaction is 1000 revolutions per minute, and the stirring speed at the latter stage of the reaction is 800 revolutions per minute. After the reaction, the ...

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Abstract

This invention relates to water base Fe3O4 magnetic liquid process and provides one water base magnetizing liquid and its process method. This invention adopts shell chitose ramification of CM-sephadex-C25 as surface activity agent to synthesize the Fe3O4 water base magnetizing liquid.

Description

Technical field [0001] The invention relates to a water-based Fe 3 O 4 Preparation method of magnetic liquid. technical background [0002] The so-called magnetic liquid refers to a colloidal system formed by highly dispersed nano-magnetic particles with surfactants in a carrier liquid. It is mainly composed of nano magnetic particles, surfactants and carrier liquid. The process technology can be classified and described from the following points: [0003] 1. Preparation method: The preparation methods of magnetic liquid mainly include mechanical grinding method, chemical co-precipitation method, thermal decomposition method, spark erosion method, reduction method and vacuum evaporation method, among which chemical co-precipitation method is currently the most commonly used method. [0004] 2. Magnetic particle carrier liquid: mainly water or aqueous solution, hydrocarbon, organic silicon oil perfluorinated liquid, etc. as carrier liquid for magnetic particles. The corresponding ...

Claims

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Application Information

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IPC IPC(8): H01F1/44
Inventor 沈辉孙启凤徐雪青
Owner SUN YAT SEN UNIV
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