Ethyl silicon oil based magnetic liquid and preparation method thereof

A technology of ethyl silicone oil and magnetic liquid, applied in the direction of the solid anode of the discharge tube, the main electrode of the discharge tube, etc., can solve the problems of poor oxidation resistance, poor magnetic properties, poor stability, etc., and achieve low equipment requirements and simple preparation methods , the effect of uniform particle size distribution

Inactive Publication Date: 2008-07-23
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing oil-based magnetic liquid has the disadvantages of poor

Method used

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  • Ethyl silicon oil based magnetic liquid and preparation method thereof
  • Ethyl silicon oil based magnetic liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of ethyl silicone oil-based magnetic liquid

[0034] (1) Prepare 100mL Fe 2+ , Fe 3+ Mix the solution in a 250mL three-necked bottle, Fe 2+ , Fe 3+ The molar ratio is 1:1.5, about 40mL of concentrated ammonia water is added under stirring, the reaction temperature is 80°C, and the stirring speed is 400r / min. After reacting for 1 minute, add 50 mL of 0.6 g / mL sodium oleate aqueous solution and continue the reaction for 30 minutes to obtain oleic acid-modified nano-Fe 3 o 4 Magnetic Particles, Surfactants in Nano Fe 3 o 4 The adsorption structure of the particle surface is shown in Fig. 1;

[0035] (2) the modified nano-Fe obtained by step (1) reaction 3 o 4 The magnetic particles are washed repeatedly with distilled water until the conductivity of the washing liquid is σ≤30μs / cm, and the wet-state modified nano-Fe obtained after washing 3 o 4 After the magnetic particles are cleaned with ethanol solution and the supernatant is separated b...

Embodiment 2

[0037] Example 2 Preparation of ethyl silicone oil-based magnetic liquid

[0038] (1) Prepare 100mL Fe 2+ , Fe3+ Mix the solution in a 250mL three-necked bottle, Fe 2+ , Fe 3+ The molar ratio is 1:1.5, about 40mL of concentrated ammonia water is added under stirring, the reaction temperature is 80°C, and the stirring speed is 400r / min. After reacting for 1 minute, add 50 mL of 0.6 g / mL sodium oleate aqueous solution and continue the reaction for 30 minutes to obtain oleic acid-modified nano-Fe 3 o 4 magnetic particles;

[0039] (2) the modified nano-Fe obtained by step (1) reaction 3 o 4 The magnetic particles are washed repeatedly with distilled water until the conductivity of the washing liquid is σ≤30μs / cm, and the wet-state modified nano-Fe obtained after washing 3 o 4 After the magnetic particles are washed with acetone solution and the supernatant is separated by magnetic separation, they are placed in a nitrogen-protected drying oven for drying treatment at a te...

Embodiment 3

[0041] Example 3 Preparation of ethyl silicone oil-based magnetic liquid

[0042] (1) Prepare 50mL Fe 2+ , Fe 3+ Mix the solution in a 500mL beaker, Fe 2+ , Fe 3+ The molar ratio is 1:1.5, about 20mL of concentrated ammonia water is added under stirring, the reaction temperature is 80°C, and the stirring speed is 350r / min. After reacting for 5 minutes, add 10 mL of ethanol solution containing 0.71 g oleoyl sarcosine, and continue the reaction for 35 minutes to obtain oleoyl sarcosine-modified nano-Fe 3 o 4 magnetic particles;

[0043] (2) the modified nano-Fe obtained by step (1) reaction 3 o 4 The magnetic particles are washed repeatedly with distilled water until the conductivity of the washing liquid is σ≤30μs / cm, and the wet-state modified nano-Fe obtained after washing 3 o 4 After cleaning the magnetic particles with ethanol solution and separating the supernatant by magnetic separation, place them in a nitrogen-protected drying oven for drying treatment at a tem...

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Abstract

The invention disclose a preparation method of ethyl silicon oil magnetic liquid, aiming at providing ethyl silicon oil magnetic liquid and the preparation method to overcome the drawbacks of the prior art. The granularity of the magnetic grains is even and the mean grain diameter is 8 to 9 nm without gathering. The ethyl silicon oil magnetic liquid is possessed with a series of special performances of the ethyl silicon oil and good low temperature resistance. The preparation method does not separate out any deposit and can still keep fluid putting at standstill and minus 12 DEG C for one month. The saturation intensity can reach 20.0 emu/g tested by vibrating sample magnetometer. The preparation method of ethyl silicon oil magnetic liquid has the advantages of high magnetism, steady dispersion, simple method and low requirement to the equipments.

Description

technical field [0001] The invention relates to surface modification and dispersion technology of nano powder, in particular to an ethyl silicone oil-based Fe 3 o 4 Magnetic liquid and method for its preparation. Background technique [0002] The so-called magnetic liquid is a uniform and stable colloidal solution formed by highly dispersing nano-scale ultrafine magnetic particles treated with surfactants in the base liquid, so it has both magnetism and fluidity at the same time, and it has special physical properties , chemical properties and fluid properties, mainly composed of nano-magnetic particles, surface modifiers and carrier liquid. Its process technology can be described by the following points: [0003] 1. Selection and preparation of magnetic nanoparticles: [0004] Commonly used magnetic materials are divided into three categories, ferrite system, metal system and iron nitride system. Among them, nano Fe 3 o 4 Magnetic particles have the characteristics o...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K5/16H01J1/44C08K3/22
Inventor 沈辉庄琳招泳欣
Owner SUN YAT SEN UNIV
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