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A kind of bayberry-like polydopamine core-gold-shell nanocomposite material and preparation method thereof

A polydopamine core-gold-shell, nanocomposite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the complex preparation process, low controllability of morphology, and a lot of inconvenience Preparation and other problems, to achieve the effect of reducing the reaction rate, the equipment is simple and easy to operate, and inhibiting spontaneous nucleation

Inactive Publication Date: 2019-07-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these methods have complex preparation processes, low morphology controllability, and are not convenient for large-scale preparation.

Method used

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  • A kind of bayberry-like polydopamine core-gold-shell nanocomposite material and preparation method thereof
  • A kind of bayberry-like polydopamine core-gold-shell nanocomposite material and preparation method thereof
  • A kind of bayberry-like polydopamine core-gold-shell nanocomposite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] 1) Preparation of polydopamine nanospheres:

[0046] Mix ethanol with a 28% alkali solution in a mass ratio of 16:1, and the alkali solution is ammonia; and then prepare an aqueous dopamine solution with a concentration of 6%. Then according to the mass ratio of dopamine to the ethanol-base solution of 1:60, the dopamine aqueous solution and the ethanol-base solution were mixed, stirred for 20 hours, and washed by centrifugation at a speed of 12000 rpm to obtain polydopamine nanospheres, such as figure 1 Shown.

[0047] 2) Preparation of polydopamine sodium@金种 solution:

[0048] According to the mass ratio of 1% chloroauric acid to 8% polydopamine nanospheres, the chloroauric acid aqueous solution was added dropwise to the polydopamine nanospheres aqueous solution, mixed ultrasonically, and then 1% aqueous solution of 0.5% reducing agent sodium borohydride was added to achieve Load nano-gold species on the surface of polydopamine nanospheres, that is, polydopamine sodium@金种so...

Embodiment 2

[0052] 1) Preparation of polydopamine nanospheres:

[0053] Mix ethanol with a 30% alkali solution in a mass ratio of 14:1, and the alkali solution is sodium hydroxide; then prepare a 4% dopamine aqueous solution. Then, according to the mass ratio of dopamine to the ethanol-base solution of 1:80, the dopamine aqueous solution and the ethanol-base solution were mixed, stirred for 30 hours, and washed by centrifugation at a speed of 12000 revolutions / min to obtain polydopamine nanospheres.

[0054] 2) Preparation of polydopamine sodium@金种 solution:

[0055] According to the mass ratio of 4% chloroauric acid and 6% polydopamine nanospheres, the chloroauric acid aqueous solution was added dropwise to the polydopamine nanospheres aqueous solution, mixed ultrasonically, and then 1.5% sodium citrate aqueous solution with a concentration of 0.3% reducing agent was added to achieve Load the nano-gold species on the surface of the polydopamine nanospheres, that is, polydopamine sodium@金种solut...

Embodiment 3

[0059] 1) Mix ethanol with a 29% alkali solution in a mass ratio of 8:1, and the alkali solution is potassium hydroxide; then prepare a 6% aqueous dopamine solution. Then according to the mass ratio of dopamine to the ethanol-base solution of 1:100, the dopamine aqueous solution and the ethanol-base solution were mixed, stirred for 30 hours, and centrifuged and washed at a speed of 12,000 revolutions / min to obtain polydopamine nanospheres.

[0060] 2) Preparation of polydopamine sodium@金种 solution:

[0061] According to the mass ratio of 3.5% chloroauric acid to 2.5% polydopamine nanospheres, the chloroauric acid aqueous solution was added dropwise to the polydopamine nanospheres aqueous solution, mixed ultrasonically, and then 2% of the 0.3% reducing agent ascorbic acid aqueous solution was added to achieve the The surface of the dopamine nanospheres is loaded with nano-gold species, that is, polydopamine sodium@金种solution, which is centrifuged and washed at a speed of 12000 rpm t...

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Abstract

The invention provides a preparation method of a waxberry-like polydopamine core-gold shell nanocomposite material. The nanomaterial comprises a polydopamine core and a three-dimensional gold shell. The preparation method comprises the following steps: firstly, mixing an aqueous dopamine solution and an alkali ethanol solution to obtain polydopamine nanospheres; ultrasonically mixing 1-4% of chloroauric acid and an aqueous solution of 2.5-8% of the polydopamine nanospheres, and then adding 1-2% of a reducing agent so as to achieve loading of nanogold seeds on the surfaces of the polydopamine nanospheres; mixing 1.5-6% of chloroauric acid, 5-15% of iodized salt, 50-70% of polyvinylpyrrolidone and 8-15% of ascorbic acid, and then adding 3-6% of a polydopamine sodium@gold seed solution, performing a reduction reaction, and then centrifugally washing to obtain the waxberry-like polydopamine core-gold shell nanocomposite material. The waxberry-like nanomaterial prepared by the preparation method provided by the invention has a unique biomimetic structure and a large specific surface area, and can load a large amount of active medicines and molecular dyes.

Description

Technical field [0001] The invention relates to the preparation of a precious metal nano gold shell material, in particular to a bayberry-like polydopamine core gold shell nano composite material and a preparation method thereof. Background technique [0002] Noble metal nanomaterials have attracted more and more attention because of their excellent properties in optics, electricity, catalysis and sensing. Since scientists discovered in the 1970s that pyridine molecules adsorbed on the surface of rough silver electrodes have enhanced Raman scattering, silver nanomaterials have been used in preparation, modification, modification, and surface enhanced Raman Scattering (SERS). Has been rapid development. The bayberry-like polydopamine core three-dimensional gold nanoshell is a unique noble metal composite nanomaterial. Due to its special hierarchical structure, large specific surface area, good catalytic and optical properties, it is used in SERS sensing, catalysis, medicine It h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/04C08G73/06C08K3/08B82Y30/00
CPCB82Y30/00C08G73/0672C08K3/08C08K2003/0831C08K2201/011C08L79/04
Inventor 赵永席陈东圳宋忠孝魏晶黄剑陈锋
Owner XI AN JIAOTONG UNIV
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