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A kind of graphene-loaded layered silicate nanocomposite material and preparation method thereof

A technology of nanocomposite materials and layered silicate, which is applied in the field of nanocomposite materials and their preparation, can solve the troublesome process of removing stabilizers, cannot be preserved for a long time, and affects the properties of graphene, etc., and achieves the goal of preparing Fast, mild conditions, simple method results

Active Publication Date: 2016-01-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, people used hydrazine hydrate as a strong reducing agent to reduce the oxidized graphene. Although the reduction effect is very good, hydrazine hydrate is a highly toxic and expensive chemical reagent.
For the prepared graphene, its potential application value can be highlighted in various industries, but because the graphene prepared by the Hummers' method will undergo a large amount of flocculation in the water phase, it cannot be preserved for a long time, so it is also which limits its further application
In past research, people have tried various surfactants, polymers with surfactant properties and biomacromolecules as stabilizers, and used non-covalent modification to obtain a composite graphene materials, although this method can prepare graphene that is stably dispersed in water, the presence of stabilizers affects the properties of graphene and the process of completely removing the stabilizers is also very troublesome

Method used

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  • A kind of graphene-loaded layered silicate nanocomposite material and preparation method thereof
  • A kind of graphene-loaded layered silicate nanocomposite material and preparation method thereof
  • A kind of graphene-loaded layered silicate nanocomposite material and preparation method thereof

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Effect test

Embodiment 1

[0026]Organic rectorite is obtained by reacting 0.1CEC cetyltrimethylammonium bromide and calcium-based rectorite under microwave conditions, and then organic rectorite and graphene oxide (mass ratio is 5:1) respectively dispersed in water, wherein the organic rectorite solution was heated and stirred overnight at room temperature, and the graphene oxide was first dispersed ultrasonically, and the organic rectorite dispersion was added dropwise to the graphene oxide solution and dispersed ultrasonically; the organic rectorite After ultrasonication, the pH of the / graphene oxide mixed solution was adjusted to 8, and the carboxymethyl chitosan quaternary ammonium salt solution A: 0.4%, B: 4.0% (both mass percentages) were prepared, heated and stirred in an oil bath to 85°C, A solution Add graphene oxide dropwise for 5 minutes. After half an hour of reaction, perform ultrasonic operation to disperse the solution evenly; continue to add solution B dropwise for 3 minutes. The droppi...

Embodiment 2

[0028] Organic rectorite is obtained by reacting 0.5CEC dodecyltrimethylammonium bromide and calcium-based rectorite under microwave conditions, and then organic rectorite and graphene oxide (mass ratio: 10:1) are respectively Dispersed in water, wherein the organic rectorite solution was heated and stirred overnight at room temperature, the graphene oxide was first ultrasonically dispersed, and the organic rectorite dispersion was added dropwise to the graphene oxide solution and ultrasonically dispersed; the organic rectorite / The pH of the graphene oxide mixed solution was adjusted to 9 after ultrasonication, and the carboxymethyl chitosan quaternary ammonium salt solution A: 0.5%, B: 3.0% (both mass percentages) were prepared, heated and stirred in an oil bath to 90°C, and the A solution was dropped Add graphene oxide, the dropping time is 20 minutes, after 45 minutes of reaction, perform ultrasonic operation to disperse the solution evenly; continue to drop B solution, the...

Embodiment 3

[0030] Organic rectorite is obtained by reacting propylene bis(octadecyl dimethyl ammonium chloride) and calcium-based rectorite under microwave conditions at 3.0CEC, and then organic rectorite and graphene oxide (mass ratio 20:1) were respectively dispersed in water, wherein the organic rectorite solution was heated and stirred overnight at room temperature, the graphene oxide was first ultrasonically dispersed, and the organic rectorite dispersion was added drop by drop to the graphene oxide solution and ultrasonically dispersed; Adjust the pH of the organic rectorite / graphene oxide mixed solution to 10 after ultrasonication, prepare carboxymethyl chitosan quaternary ammonium salt solution A: 0.6%, B: 2.0% (both mass percentages), heat and stir in an oil bath until At 90°C, add solution A dropwise to graphene oxide for 10 minutes. After 1 hour of reaction, perform ultrasonic operation to disperse the solution evenly; continue to add solution B dropwise for 5 minutes. The drop...

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Abstract

The invention provides a graphene-loaded layered silicate nanocomposite material and a preparation method thereof. It uses a water-soluble polymer chitosan-based material as a reducing agent and a stabilizer to increase the layered silicate layer spacing while reducing graphene oxide, and the layered silicate acts as a graphene stabilizer and templates, so that the prepared graphene is loaded on the layered silicate; compared with the graphene in the composite without layered silicate, the graphene in the layered silicate composite has better The straightness reflects the templating effect of layered silicates. In the present invention, the use of toxic chemical reducing agents and stabilizers is avoided, the preparation method is simple and environmentally friendly, and the obtained graphene-loaded layered silicate nanocomposite material has excellent dispersion stability in water, and is used in drug-loading, biomedical, It has good application prospects in many fields such as adsorption.

Description

technical field [0001] The invention relates to a nanocomposite material and a preparation method thereof, belonging to the field of nanotechnology. Specifically, it is a graphene-loaded layered silicate nanocomposite material and a preparation method thereof. Background technique [0002] Graphene is a hot material that has only been discovered and applied in recent years. Its structure is a single-layer graphite sheet, which is the basic unit of graphite, carbon nanotubes, and fullerenes. The structure of graphene is very stable, and the connections between carbon atoms are very flexible. When an external force is applied, the surface of the carbon atoms bends and deforms, so that the carbon atoms do not need to be rearranged to adapt to the external force. In terms of chemical properties, graphene has many excellent properties, such as excellent electrical conductivity, excellent thermal stability, and excellent mechanical properties. [0003] The preparation of graphen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C01B32/184C01B32/19
Inventor 王小英李晓云韩洋孙润仓
Owner SOUTH CHINA UNIV OF TECH