A kind of anti-oxidation dimethyl silicone oil-based magnetic liquid and preparation method thereof

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

Inactive Publication Date: 2011-11-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of anti-oxidation dimethyl silicone oil-based magnetic liquid and preparation method thereof
  • A kind of anti-oxidation dimethyl silicone oil-based magnetic liquid and preparation method thereof
  • A kind of anti-oxidation dimethyl silicone oil-based magnetic liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 prepares 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 and ...

Embodiment 2

[0049] Embodiment 2 prepares 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, he...

Embodiment 3

[0056] Embodiment 3 prepares 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, and then nano-NiFe can be prepared. 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, h...

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Abstract

The invention provides an oxidation-resistant dimethyl silicone oil-based magnetic liquid and a preparation method thereof. The dimethyl silicone oil-based magnetic liquid is made of nano-magnetic particles, a surface modifier and a carrier liquid, and the carrier liquid is two Methicone. The preparation method of the simethicone oil-based magnetic liquid comprises the following steps: preparing nano magnetic particles; activating nano magnetic particles; preparing nano magnetic particles modified with surfactant; adding the purified modified nano magnetic particles Add dichloromethane, disperse and filter to obtain dichloromethane-based magnetic liquid; then add the magnetic liquid to dimethyl silicone oil to stir and disperse, heat and keep the temperature at 50-90°C, separate and precipitate to obtain dimethyl Silicone oil-based magnetic fluid. The simethicone oil-based magnetic liquid of the invention has high stability, low temperature resistance and high temperature resistance. The preparation method of the invention is simple, high in efficiency, low in equipment requirements, easy to realize application in various fields, and has broad application prospects.

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 Patents(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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