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A method for preparing gold-coated nano-magnetic particles for preparing magnetic liquids

A magnetic particle and nano-magnetic technology, which is applied in the direction of magnetic liquid, magnetic objects, magnetic materials, etc., to achieve the effect of high magnetization strength, small coercive force, and uniformity

Inactive Publication Date: 2011-12-21
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of gold-coated ferroferric oxide nano-magnetic particles in the preparation of magnetic liquids has not been reported yet.

Method used

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  • A method for preparing gold-coated nano-magnetic particles for preparing magnetic liquids
  • A method for preparing gold-coated nano-magnetic particles for preparing magnetic liquids
  • A method for preparing gold-coated nano-magnetic particles for preparing magnetic liquids

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for preparing a gold-coated nano-magnetic particle for preparing a magnetic liquid, the preparation method comprising the following steps:

[0029] In step 1, the mass ratio of ferric iron tetroxide nano-magnetic particles to chloroauric acid is 1:10, and the mass ratio of chloroauric acid to sodium citrate is 1:36.9.

[0030] Weigh 0.1 g of dried iron ferric oxide nano-magnetic particles, 1 g of chloroauric acid, and 36.9 g of sodium citrate.

[0031] The chloroauric acid 1g that weighs is mixed with molar concentration and is 80mmol / L chloroauric acid solution.

[0032] The sodium citrate 36.9g that will take by weighing is mixed with molar concentration and is 2.5mol / L sodium citrate solution.

[0033] Step 2, dissolving 0.1 g of iron ferric oxide nano-magnetic particles weighed in absolute ethanol, and ultrasonically dispersing in an ultrasonic cleaner until the magnetic particles are completely dispersed.

[0034] Step 3, add 0.4ml of 3-aminopropyltrieth...

Embodiment 2

[0038] A method for preparing a gold-coated nano-magnetic particle for preparing a magnetic liquid, the preparation method comprising the following steps:

[0039] In step 1, the mass ratio of ferric iron tetroxide nano-magnetic particles to chloroauric acid is 1:0.5, and the mass ratio of chloroauric acid to sodium citrate is 1:7.4.

[0040] Weigh 1 g of dried iron ferric oxide nano-magnetic particles, 0.5 g of chloroauric acid, and 3.7 g of sodium citrate.

[0041] The chloroauric acid 0.5g that weighs is mixed with molar concentration and is 48.6mmol / L chloroauric acid solution.

[0042] The sodium citrate 3.7g that takes by weighing is formulated and made into molar concentration and is 1mol / L sodium citrate solution.

[0043] Step 2, dissolving 1 g of iron ferric oxide nano-magnetic particles weighed in absolute ethanol, and ultrasonically dispersing in an ultrasonic cleaner until the magnetic particles are completely dispersed.

[0044] Step 3, add 1ml 3-aminopropyltri...

Embodiment 3

[0048] A method for preparing a gold-coated nano-magnetic particle for preparing a magnetic liquid, the preparation method comprising the following steps:

[0049] Step 1: The mass ratio of iron ferric oxide nano-magnetic particles to chloroauric acid is 1:0.5, and the mass ratio of chloroauric acid to hydroxylamine hydrochloride is 1:5.6.

[0050] Weigh 1 g of dried iron ferric oxide nano-magnetic particles, 0.5 g of chloroauric acid, and 2.8 g of hydroxylamine hydrochloride.

[0051] The chloroauric acid 0.5g that weighs is mixed with molar concentration and is 48.6mmol / L chloroauric acid solution.

[0052] The hydroxylamine hydrochloride 2.8g that weighed is formulated and made molar concentration and is 0.1mol / L hydroxylamine hydrochloride solution.

[0053] Step 2, dissolving 1 g of iron ferric oxide nano-magnetic particles weighed in absolute ethanol, and ultrasonically dispersing in an ultrasonic cleaner until the magnetic particles are completely dispersed.

[0054] ...

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Abstract

A method for preparing gold-coated nano-magnetic particles for preparing magnetic liquids, the method comprising: chloroauric acid and sodium citrate at a mass ratio of ferric oxide nano-magnetic particles to chloroauric acid of 1:10 to 1:0.5 The mass ratio of 1:36.9~1:7.4 or the mass ratio of chloroauric acid and hydroxylamine hydrochloride 1:5.6~1:2 is weighed and prepared; the solution is made according to the weighed chloroauric acid, hydroxylamine hydrochloride and sodium citrate. Dissolve ferric oxide nano-magnetic particles in absolute ethanol and disperse completely by ultrasonic. Add 3-aminopropyltriethoxysilane and iron ferric oxide nano-magnetic particles, the ratio of volume to mass is 1:1-4:1, and continue to sonicate. Add the configured chloroauric acid solution and ultrasonicate for 1h. Adding sodium citrate solution and hydroxylamine hydrochloride solution, ultrasonication for 6 hours, separation, washing, ultrasonic cleaning with dilute hydrochloric acid for 1 hour, separation and drying, to prepare gold-coated nano-magnetic particles. The corrosion resistance of magnetic fluids prepared from gold-coated particles is enhanced.

Description

technical field [0001] The invention belongs to the field of nano magnetic materials and relates to a preparation method of gold-coated nano magnetic particles used for preparing magnetic liquids. Background technique [0002] Magnetic liquid is a new type of nano functional material. It is a stable colloidal system composed of nano-scale magnetic particles uniformly dispersed in the carrier liquid. Because it has both magnetic properties and liquid fluidity, as well as its superparamagnetic properties, it has a series of unique excellent properties that other conventional materials and new materials do not have, and can be widely used in seals, bearings , sensors, lubrication, grinding, damping, electronic technology, information technology, biomedicine and other fields. [0003] At present, many units have studied the preparation of magnetic liquids and made great progress. However, due to the sensitivity of ferric iron tetroxide nanoparticles in magnetic liquids to acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/00H01F1/44
Inventor 李德才张少兰
Owner BEIJING JIAOTONG UNIV
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