A method for preparing nanoscale noble metal-shell magnetic core composite particles by self-assembly

A technology of composite particles and precious metals, which is used in the preparation of microspheres, the magnetic properties of inorganic materials, and the preparation of microcapsules, can solve the problems of unfavorable research on the formation mechanism of composite microspheres, difficult to achieve process controllability and reference to the preparation method of composite particles, etc. The effect of good biocompatibility and chemical stability, good magnetic responsiveness, and simple preparation method

Active Publication Date: 2017-04-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity of the preparation process of nuclear materials, it is not conducive to the study of the formation mechanism of composite microspheres, and it is difficult to realize the controllability of the process and the reference of the preparation method of composite particles

Method used

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  • A method for preparing nanoscale noble metal-shell magnetic core composite particles by self-assembly
  • A method for preparing nanoscale noble metal-shell magnetic core composite particles by self-assembly
  • A method for preparing nanoscale noble metal-shell magnetic core composite particles by self-assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Fe 3 o 4 Preparation of Nanoparticle Solution:

[0037](a) Add ferrous chloride, 1.5g ferric chloride and sodium oleate into a mixed solvent of ethanol and ethylene glycol in a mass ratio of 2:3:3, stir at room temperature for 1 hour and then add 1mol / L ammonia water Adjust the pH value to 9-10, then transfer the mixed solution to a stainless steel high-pressure reactor, react at 160-190°C for 18 hours, and then centrifuge for 30 minutes to obtain nano-Fe dispersed in the oil phase 3 o 4 , and then washed repeatedly with ethanol and cyclohexane with a volume ratio of 1:1, and then resuspended in cyclohexane to obtain the oil phase nano-Fe 3 o 4 solution;

[0038] (b) Nano-Fe in the oil phase 3 o 4 Add NaClO solution to the solution, and then use 1mol / L NaOH solution to adjust the pH value to 10-11. After stirring, sonicate for 20 minutes to obtain a reaction solution. According to the reaction solution: RuCl 3 The volume ratio is 1:1, add RuCl to the reactio...

Embodiment 2

[0052] (1) Fe 3 o 4 Preparation of Nanoparticle Solution:

[0053] (a) Add ferrous chloride, 1.5g ferric chloride and sodium oleate into the mixed solvent of ethanol and ethylene glycol in a mass ratio of 2:3:3, stir at room temperature for 0.5-1 hour, then add 1mol / L ammonia water to adjust the pH value to 9-10, then transfer the mixed solution to a stainless steel autoclave, react at 160-190°C for 18 hours, and then centrifuge for 30 minutes to obtain nano-Fe dispersed in the oil phase 3 o 4 , and then washed repeatedly with ethanol and cyclohexane with a volume ratio of 1:1, and then resuspended in cyclohexane to obtain the oil phase nano-Fe 3 o 4 solution;

[0054] (b) Nano-Fe in the oil phase 3 o 4 Add NaClO solution to the solution, and then use 1mol / L NaOH solution to adjust the pH value to 10-11. After stirring, sonicate for 20 minutes to obtain a reaction solution. According to the reaction solution: RuCl 3 The volume ratio is 1:1, add RuCl to the reaction so...

Embodiment 3

[0064] A method for preparing nanoscale noble metal-shell magnetic core composite particles by self-assembly, comprising the following steps:

[0065] (1) Fe 3 o 4 Preparation of nanoparticles:

[0066] (a) Add ferrous chloride, ferric chloride and sodium oleate to the mixed solvent of ethanol and ethylene glycol, mix well, use 1mol / L ammonia water to adjust the pH value to 9, and then react at 180°C for 15 Hours, centrifuged to obtain nano-Fe dispersed in the oil phase 3 o 4 , and after washing with a mixture of ethanol and cyclohexane, Fe 3 o 4 Nanoparticles, resuspended in cyclohexane to obtain nano-Fe in oil phase 3 o 4 solution; wherein, the mass ratio of ferrous chloride, ferric chloride, and sodium oleate is 2:3:3.5; the volume ratio of ethanol and ethylene glycol in the mixed solvent of ethanol and ethylene glycol is 1:10; ethanol and The volume ratio of ethanol and cyclohexane in the mixture of cyclohexane is 1:1.

[0067] (b) to the oil phase nano-Fe 3 o 4...

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Abstract

A method for preparing nanometer precious metal shell and magnetic core composite particle through self-assembling comprises the following steps: mixing a magnetic core with a Au nanoparticle or a Ag nanoparticle according to a mass ratio of 1:(20-200), adding an auric chloride acid solution when the Au nanoparticle is mixed or adding a silver nitrate solution when the Ag nanoparticle is mixed in order to obtain a mixed solution, adding sodium citrate to the mixed solution, and reacting the above obtained mixture in an air oscillator to obtain the Fe3O4 / precious metal core-shell nanocomposite particle. The Fe3O4 / polymer / precious metal magnetic composite material is obtained through carrying out polymer cladding of the surface of the magnetic nanoparticle, assembling the precious metal nanoparticle and forming a continuous precious metal shell through in situ reduction, and the magnetic composite material has the characteristics of good biocompatibility, uniform particle size, nanometer optical effects, large specific surface area, unique optical characteristics, superparamagnetism, and good magnetic responsibility under applied magnetic field.

Description

technical field [0001] The invention belongs to the technical field of organic-inorganic nano-composite materials, and in particular relates to a method for self-assembling and preparing nano-scale precious metal-shell magnetic core composite particles. Background technique [0002] Due to the characteristics of small size and fast magnetic response, nanoscale superparamagnetic nanoparticles have been widely used in biomedical fields such as magnetic separation and purification, targeted drug delivery, MRI contrast agents, and magnetic hyperthermia. Noble metal (Au, Ag) nanoparticles have shown broad application prospects in biological detection and medical imaging due to their unique optical properties, chemical inertness, and easy biofunctionalization. The magnetic composite particles obtained by combining magnetic particles and noble metal nanoparticles will have both the excellent characteristics of the above-mentioned nanoparticles. The prerequisites for its good applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02H01F1/11C01G49/08
Inventor 杨冬
Owner SHAANXI UNIV OF SCI & TECH
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