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Method for preparing gold magnetic particles

A technology of gold magnetic particles and particles, which is applied in the field of composite material synthesis, can solve the problems of non-adoption and achieve the effects of less agglomeration, mild reaction conditions and convenient application

Active Publication Date: 2010-06-09
XIAN GOLDMAG NANOBIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent 200710159171.9 discloses the preparation method of silver-nickel core-shell particles using microemulsion. Patents ZL 03124061.5 and ZL 03153486.4 disclose the preparation method and application field of gold / magnetic oxide composite particles. Article J.AM.CHEM.SOC.2007, 129 , 8698-8699 also reported the preparation method of this inorganic composite material, but above all did not adopt forward microemulsion method

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  • Method for preparing gold magnetic particles
  • Method for preparing gold magnetic particles
  • Method for preparing gold magnetic particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of forward microemulsion each reagent and its proportioning ratio are as follows:

[0042] components

Reagent name

Amount of reagent

1. Oil phase

Toluene containing 0.5g oxide particles

20ml

2. Water phase

Containing 10% chloroauric acid deionized aqueous solution

200ml

3. Surfactant

Dodecyltrimethylammonium Chloride

0.5g

4. Reducing agent

1M Hydroxylamine Hydrochloride

10ml

[0043] Specific steps are as follows:

[0044] Stir and mix component 1 and component 3 in the above table for 10 minutes, then add component 2 and continue to react for 40 minutes to form a microemulsion, then add component 4 dropwise, react for 5 hours, add 200ml of ethanol and stir for 5 minutes For demulsification, place the reactants on a magnet for magnetic separation, discard the supernatant, and wash with water for 3 times to obtain gold magnetic particles with a particle size of about 60 nm.

Embodiment 2

[0046] A kind of forward microemulsion each reagent and its proportioning ratio are as follows:

[0047] components

Reagent name

Amount of reagent

1. Oil phase

Cyclohexane with 0.5 g of oxide particles

20ml

2. Water phase

Containing 10% chloroauric acid deionized aqueous solution

200ml

[0048] components

Reagent name

Amount of reagent

3. Surfactant

Octadecyl dimethyl benzyl ammonium chloride

0.5g

4. Reducing agent

1M Hydroxylamine Hydrochloride

10ml

5. Co-surfactant

n-pentyl mercaptan

3ml

[0049] Specific steps are as follows:

[0050] Stir and mix component 1 and component 3 in the above table for 5 minutes, then add component 5 and continue stirring for 5 minutes, then add component 2 and continue to react for 40 minutes to form a microemulsion, then add component 4 drop by drop, and react After 5 hours, add 200ml of ethanol and stir for 5 minute...

Embodiment 3

[0052] A kind of forward microemulsion each reagent and its proportioning ratio are as follows:

[0053]

[0054] Specific steps are as follows:

[0055]Configure the reagents of each component as listed in the above table, stir to form a microemulsion, add microemulsion II to microemulsion I under stirring conditions, and react for 40 minutes, then add microemulsion III dropwise to the above reaction under stirring conditions During the reaction, the reaction was continued for 4 hours. After the reaction was completed, ethanol was added to break the emulsion, the supernatant was discarded by magnetic separation, and then washed with water to obtain gold magnetic particles.

[0056] As can be seen from the above examples, the method for preparing gold magnetic particles has mild reaction conditions, simple preparation process, no need for large-scale equipment, and the prepared gold magnetic particles have good dispersibility and uniform particle size. photos such as figu...

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Abstract

The invention belongs to the field of composite material synthesis, relating to a method for preparing composite material of gold coated magnetic oxide, i.e. gold magnetic particles, in particular to a method for preparing the gold magnetic particles by utilizing positive micro-emulsion and a one-step synthesis method. The method comprises the following steps of: establishing a positive micro-emulsion system by taking an organic reagent dispersed with oil-soluble magnetic oxide as cores and oil phase of the gold magnetic particles; then taking emulsion as a microreactor for producing the composite materials; and adding ethanol for demulsification after reaction; separating and washing the magnetic composite particles by utilizing a magnetic separator to prepare the gold magnetic particles. The method has mild reaction conditions, simple preparation process and water-soluble reagent, can be conveniently applied and is easy to realize large-scale production. AuC14- of chlorogold acid is adsorbed at the surface of the oil-soluble oxide particles by a cation surface active agent selected in the method for further reduction, reunion of the composite is little, and the coating is uniform. The sizes of the particles are controlled by controlling the size of the microreactor, and the sizes of the particles are uniform.

Description

technical field [0001] The invention belongs to the field of composite material synthesis, and relates to a gold-coated magnetic oxide composite material, that is, a method for preparing gold magnetic particles, in particular to a method for preparing gold magnetic particles by using a forward microemulsion one-step synthesis method. Background technique [0002] Surface-coated magnetic composite particles have always been a research hotspot in the field of materials science. Appropriate coating materials can improve or optimize the physical and chemical properties of magnetic particles, make them have more characteristics, and expand the application range of particles. The composite material of gold-coated magnetic oxide has become a focus of attention in recent years. Patents ZL03124061.5 and ZL 03153486.4 disclose the preparation method and application of this composite material. After the composite particles of gold and oxide particles are combined Named as "gold magnet...

Claims

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Application Information

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IPC IPC(8): H01F1/11B22F1/02B22F9/24
Inventor 惠文利崔亚丽陈超石峰
Owner XIAN GOLDMAG NANOBIOTECH
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