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Oxidation resistant dimethyl silicon oil based magnetic fluid and preparation method thereof

A technology that is resistant to oxidation of dimethyl silicone oil and dimethyl silicone oil, which is applied in the field of nanoscience and can solve problems such as affecting the stability and service life of magnetic liquids, the low coverage rate of modifiers on the particle surface, and reducing the solubility of modified particles, etc. problems, to achieve the effects of excellent thermal stability and oxidation resistance, high chemical adsorption modification efficiency, and low viscosity-temperature coefficient

Inactive Publication Date: 2009-12-09
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification time of this method is long, the yield is low, and the coverage of the modifier on the surface of the particles is not high, which greatly reduces the solubility of the modified particles in the carrier liquid, thereby affecting the stability and stability of the prepared magnetic liquid. service life
Most of the magnetic particles used to prepare magnetic liquids in the literature are Fe3O4, which are easily oxidized to Fe2O3 during use and storage, resulting in a decrease in magnetic properties and affecting use.

Method used

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  • Oxidation resistant dimethyl silicon oil based magnetic fluid and preparation method thereof
  • Oxidation resistant dimethyl silicon oil based magnetic fluid and preparation method thereof
  • Oxidation resistant dimethyl silicon oil based magnetic fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Example 1 Preparation of MnFe 2 o 4 Dimethicone based magnetic fluid

[0041] (1) Preparation of nano-MFe 2 o 4 Magnetic particles: prepare 40mL Mn 2+ , Fe 3+ DEG mixed solution in a beaker, where Mn 2+ The concentration is 0.75mol / L, Fe 3+ The concentration is 1.0mol / L. Prepare 60 mL of NaOH solution with a concentration of 3.0 mol / L in a 250 mL round bottom flask, fill it with argon, and raise the temperature to 220 °C. Keep the stirring rate at 300r / min, add the DEG solution containing metal ions into the NaOH solution, heat and boil for 10 minutes to prepare nano-MnFe 2 o 4 Magnetic particles; the resulting nano-MnFe 2 o 4 The magnetic particles are washed repeatedly with distilled water until the conductivity of the eluate is σ=92μs / cm;

[0042] (2) Nano-MFe 2 o 4 Activation treatment of magnetic particles: the nanometer MnFe that step (1) obtains 2 o 4 Add 30ml of FeCl with a concentration of 1.0mol / L to the magnetic particles 3 solution, heated a...

Embodiment 2

[0049] Example 2 Preparation of CoFe 2 o 4 Dimethicone based magnetic fluid

[0050] (1) Preparation of nano-MFe 2 o 4 Magnetic particles: prepare 40mL Co 2+ , Fe 3+ DEG mixed solution in 80mL beaker, where Co 2+ The concentration is 0.75mol / L, Fe 3+ The concentration is 1.0mol / L. Prepare 60 mL of NaOH solution with a concentration of 3.0 mol / L in a 250 mL round bottom flask, fill it with argon, raise the temperature to 220 °C, keep the stirring speed at 300 r / min, add the DEG solution containing metal ions into the NaOH solution, Nano-CoFe can be prepared by heating and boiling for 10 minutes 2 o 4 Magnetic particles; the resulting nano-CoFe 2 o 4 The magnetic particles are washed repeatedly with distilled water until the conductivity of the eluate is σ=87μs / cm;

[0051] (2) Nano-MFe 2 o 4 Activation treatment of magnetic particles: the nano-CoFe obtained in step (1) 2 o 4 Add 30ml of FeCl with a concentration of 1.0mol / L to the magnetic particles 3 solution,...

Embodiment 3

[0056] Example 3 Preparation of NiFe 2 o 4 Dimethicone based magnetic fluid

[0057] (1) Preparation of nano-MFe 2 o 4 Magnetic particles: prepare 40mL Ni 2+ , Fe 3+ DEG mixed solution in a beaker, where Ni 2+ The concentration is 0.75mol / L, Fe 3+ The concentration is 1.0mol / L. Prepare 60 mL of NaOH solution with a concentration of 3.0 mol / L in a 250 mL round bottom flask, fill it with argon, and raise the temperature to 220 °C. Keep the stirring rate at 300r / min, add the DEG solution containing metal ions into the NaOH solution, heat and boil for 10 minutes to prepare nano-NiFe 2 o 4 Magnetic particles; the resulting nano-NiFe 2 o 4 The magnetic particles are washed repeatedly with distilled water until the conductivity of the eluate is σ=90μs / cm;

[0058] (2) Nano-MFe 2 o 4 Activation treatment of magnetic particles: the nano-NiFe obtained in step (1) 2 o 4 Add 30ml of FeCl with a concentration of 1.0mol / L to the magnetic particles 3 solution, heated and sti...

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Abstract

The invention provides oxidation resistant dimethyl silicon oil based magnetic fluid and a preparation method thereof; the dimethyl silicon oil based magnetic fluid is prepared by nano-magnetic particles, a surface modifier and carrier fluid, and the carrier fluid is the dimethyl silicon oil. The preparation method of the dimethyl silicon oil based magnetic fluid comprises the following steps: preparing the nano-magnetic particles; treating the nano-magnetic particles in an activated way; preparing the nano-magnetic particles which are modified by the surface modifier; adding the modified nano-magnetic particles which are purified into methylene dichloride, dispersing and filtering the mixture to obtain the methylene dichloride based magnetic fluid; adding the magnetic fluid into the dimethyl silicon oil to be stirred and dispersed, heating the mixture and maintaining the temperature between 50 and 90 DEG C, separating and precipitating the mixture to obtain the dimethyl silicon oil based magnetic fluid. The dimethyl silicon oil based magnetic fluid in the invention has the advantages of high stability, low temperature resistance and high temperature resistance. The preparation method is simple, high in efficiency and low in requirement on equipments, thus being easy to be applied in various fields and having wide application prospect.

Description

technical field [0001] The invention relates to surface modification and dispersion technology of nano powder, in particular to an oxidation-resistant dimethyl silicone oil-based magnetic liquid and a preparation method thereof, belonging to the field of nano science. Background technique [0002] The so-called magnetic liquid is a uniform and stable colloidal solution formed by dispersing nano-scale magnetic particles coated with surfactants in the base liquid, so it has both magnetism and fluidity at the same time. The magnetic liquid has special physical properties and Chemical properties, mainly composed of nano-magnetic particles, surfactants and carrier liquid. [0003] Commonly used magnetic materials are divided into ferrite system, metal system and iron nitride system. Among them, ferrite has better oxidation resistance than metal and iron nitride, and composite zinc ferrite has become a recent research hotspot due to its high saturation magnetization and low Curie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44H01F1/42C08L33/04
Inventor 沈辉庄琳邵子健
Owner SUN YAT SEN UNIV
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