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Method for preparing gold nanoparticles based on polyamidoamine amine supermolecular hyperbranched polymer

A technology of hyperbranched polymer and gold nanoparticles, applied in nanotechnology and other directions, can solve the problems of difficult control of reaction conditions, unstable nanoparticles, complicated process, etc., and achieve the effects of controllable particle size, short process and simple operation.

Inactive Publication Date: 2014-12-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects that the method for preparing nano-gold particles in the prior art has complicated process, difficult to control the reaction conditions, and the prepared nanoparticles are unstable and easy to agglomerate, the purpose of the present invention is to provide a polyamide amine supramolecular hyperbranched The polymer is used as a reducing agent and a stabilizing agent at the same time, and a method for preparing gold nanoparticles with good dispersion and stability, uniform particle size distribution, and good catalytic activity for the reduction of p-nitroaniline under mild reaction conditions; By controlling the reaction conditions, the method can effectively control the particle size of gold nanoparticles, and the operation is simple and feasible.

Method used

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  • Method for preparing gold nanoparticles based on polyamidoamine amine supermolecular hyperbranched polymer
  • Method for preparing gold nanoparticles based on polyamidoamine amine supermolecular hyperbranched polymer
  • Method for preparing gold nanoparticles based on polyamidoamine amine supermolecular hyperbranched polymer

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of supramolecular hyperbranched polymer HPAM-PEG.

[0030] 80mg of hyperbranched polyamidoamine (HPAM-CD) grafted with cyclodextrin groups (34% branching degree, molecular weight 10000) and 80mg AD-PEG (molecular weight 2000) were dissolved in 10mL ultrapure water. Then, 9 mL of HPAM-CD aqueous solution and 3 mL of AD-PEG aqueous solution were mixed and stirred overnight at room temperature to obtain an aqueous solution of supramolecular hyperbranched polymer HPAM-PEG (concentration of 8 mg / mL).

Embodiment 2

[0032] The preparation of supramolecular hyperbranched polymer HPAM-PNIPAM.

[0033] Dissolve 50mg HPAM-CD (with a degree of branching of 24% and a molecular weight of 40,000) and 50mg of AD-PNIPAM (with a molecular weight of 60,000) in 5 mL of ultrapure water respectively, then mix the two solutions and stir overnight at room temperature to obtain supramolecules An aqueous solution of hyperbranched polymer HPAM-PNIPAM (concentration 10 mg / mL).

Embodiment 3

[0035] Adjust the N / Au ratio to prepare gold nanoparticle composites with different particle sizes.

[0036] Take N / Au=10 as an example: under magnetic stirring, add 1 mL of HAuCl 4 The aqueous solution (6 mg / mL) was added dropwise to 2 mL of the HPAM-PEG aqueous solution prepared in Example 1, and then reacted at room temperature in the dark for 3 days to obtain a stable aqueous dispersion of gold nanoparticles.

[0037] Similarly, take N / Au=20 as an example: under magnetic stirring, add 1 mL of HAuCl 4 The aqueous solution (2.5 mg / mL) was added dropwise to 1 mL of the HPAM-PNIPAM aqueous solution prepared in Example 2, and then reacted at room temperature in the dark for 3 days to obtain a stable aqueous dispersion of gold nanoparticles.

[0038] The polymer-gold nanoparticle composites with different N / Au molar ratios were prepared by referring to the above experimental steps. Such as image 3 As shown, the particle size and distribution of the prepared gold nanoparticles can be e...

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Abstract

The invention discloses a method for preparing gold nanoparticles based on a polyamidoamine amine supermolecular hyperbranched polymer. The method comprises the steps of slowly dripping an HAuCl4 aqueous solution into an aqueous solution of the polyamidoamine amine supermolecular hyperbranched polymer, and performing stirring reaction under a shading condition to obtain gold nanoparticle aqueous dispersion liquid. According to the preparation method, the polyamidoamine amine supermolecular hyperbranched polymer is simultaneously used as a reducing agent and a stabilizing agent; under a mild reaction condition, the gold nanoparticles which are high in dispersivity and stability, are uniform in particle size distribution and are extremely high in catalysis activity to reduction of nitroaniline are prepared; particularly, the method can be used for effectively controlling the particle size of the gold nanoparticles by controlling the reaction condition and is easy to operate and feasible.

Description

Technical field [0001] The invention relates to a method for preparing gold nano particles based on polyamidoamine supramolecular hyperbranched polymers, and belongs to the field of nano composite materials. Background technique [0002] Gold nanoparticles are known as "key elements in green nanotechnology". Due to their good stability, small size effect, surface effect, optical effect and unique biological affinity, they are used in biomedicine, sensors, catalysis and other fields. It has a very broad application prospect. In recent years, polymer-stabilized gold nanoparticles have aroused the interest of researchers. The method is to first complex the gold ion with a specific polymer, and then use an external reducing agent (such as sodium borohydride, sodium citrate, glucose, etc.) or the reductive in-situ reduction of the polymer itself to obtain a stable polymer Gold Nanoparticles. [0003] However, a single linear polymer is prone to chain entanglement and has a weak stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 孙晓毅裴凡凡王平山李娟刘秀梅
Owner CENT SOUTH UNIV
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